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ADA4853-1AKSZ-R7 中文资料
元器件交易网 www.cecb2b.com
Low Power, Rail-to-Rail Output,
Video Op Amp with Ultralow Power Disable
ADA4853-1/ADA4853-2/ADA4853-3
FEATURES
Ultralow power-down current: 0.1 μA Low quiescent current: 1.4 mA/amplifier Ideal
for standard definition video High speed
100 MHz, ?3 dB bandwidth 120 V/μs slew rate 0.5 dB flatness: 22 MHz Differential
gain: 0.20% Differential phase: 0.10° Single-supply operation Rail-to-rail output
Output swings to within 200 mV of either rail Low voltage offset: 1 mV
Wide supply range: 2.65 V to 5 V
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APPLICATIONS
Portable multimedia players Video cameras
Digital still cameras Consumer video
GENERAL DESCRIPTION
The ADA4853-1/ADA4853-2/ADA4853-3 are low power, low cost, high speed, rail-to-rail
output op amps with ultralow power disable that are ideal for portable consumer
electronics.
Despite
their
low
price,
the
ADA4853-1/ADA4853-2/http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aADA48
53-3 provide excellent overall performance and versatility. The
100 MHz, ?3 dB bandwidth and 120 V/μs slew rate make these amplifiers well-suited
for many general-purpose, high speed applications.
The ADA4853-1/ADA4853-2/ADA4853-3 voltage feedback op amps are designed to operate
at supply voltages as low as 2.65 V and up to 5 V using only 1.4 mA of supply current
per amplifier.
To further reduce power consumption, the amplifiers are equipped with
a power-down mode that lowers the supply current to less than 1.5 μA maximum, making
them ideal in battery-powered applications.
The ADA4853-1/ADA4853-2/ADA4853-3 provide users with a true single-supply capability,
allowing input signals to extend 200 mV below the negative rail and to within 1.2
V of the positive rail. On the output, the amplifiers can swing within 200 mV of either
supply rail.
Rev. B
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Information
furnished
by
Analog
Devicehttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7as is believed to be
accurate and reliable. However, no responsibility is assumed by Analog Devices for
its use, nor for any infringements of patents or other rights of third parties that
may result from its use. Specifications subject to change without notice. No license
is granted by implication or otherwise under any patent or patent rights of Analog
Devices. Trademarks and registered trademarks are the property of their respective
owners.
PIN CONFIGURATIONS
1
2C
C
DDNNPP6543VOUT1 VS–IN1V
VOUT2 IN1–IN2–V–VS IN2
1
0CCCC6
5-0NNNN-04(NottoScale)
848–850NC = NO CONNECT
58
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0Figure 1. 6-Lead SC70
–
Figure 2. 16-Lead LFCSP_VQ
–
ADA4853-3
DISABLE 1TOUTS
UVON
N VII
– DISABLE 26543DISABLE 3
V
S
SDISABLE 1–VS INhttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aDISABLE 2
INDISABLE 3–IN–IN8
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5 VSVOUT
VOUT
0OUT
-488507
5NN-0IIUTS4 –OV–88V50
Figure 3. 16-Lead LFCSP_VQ
Figure 4. 16-Lead TSSOP
With their combination of low price, excellent differential gain (0.2%), differential
phase (0.10°), and 0.5 dB flatness out to 22 MHz, these amplifiers are ideal for
video applications.
The ADA4853-1 is available in a 6-lead SC70, the ADA4853-2 is
available in a 16-lead LFCSP_VQ, and the ADA4853-3 is available in both a 16-lead
LFCSP_VQ and a 14-lead TSSOP. The ADA4853-1 temperature range is ?40°C to
while the ADA4853-2/ADA4853-3 temperature range is ?40°C to
6.56.46.3
)
Bd(6.2NIAG6.1POO6.0L-D5.9SEOL5.8C5.75.60
10-4885.550FREQUENCY(MHz)
105°C.
85°C,
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Figure 5. 0.5 dB Flatness Frequency Response
One
Technology
Way,
P.O.
Box
9106,
Norwood,
02062http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a-9106,
MA
U.S.A.Tel:
781.329.4700 www.analog.com Fax: 781.461.3113 ?2006 Analog Devices, Inc. All rights
reserved.
元器件交易网 www.cecb2b.com
ADA4853-1/ADA4853-2/ADA4853-3
Typical
Performance
Characteristics..............................................6
Circuit
Description.....................................................................
....14
Headroom
Considerations........................................................14
Overload
Behavior
and
Recovery............................................14
Applications....................................................................
.................15
Single-Supply
Amplifier.................................................15
Video
Power
Bypassing............................................................15
Supply
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Layout..........................................................................
................15
Outline
Dimensions.............http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a..
........................................................16
Ordering
Guide..........................................................................1
6
TABLE OF CONTENTS
Features........................................................................
......................1
Applications....................................................................
...................1
Pin
Configurations..................................................................
.........1
General
Description.....................................................................
....1
Revision
History.........................................................................
......2
Specifications..................................................................
...................3
Specifications
with
3
V
Supply...................................................3 Specifications with 5 V
Supply...................................................4http://www.wendangwang
.com/doc/89eddaed80358fd0fe9cbc7a
Absolute
Ratings............................................................5
Maximum
Thermal
Resistance......................................................................
5
ESD
Caution.........................................................................
.........5
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REVISION HISTORY
10/06—Rev. A to Rev. B
Added
ADA4853-3.............................................................Universal
Added
16-Lead
LFCSP_VQ..............................................Universal
Added
14-Lead
TSSOP......................................................Universal Changes to
Features........................................................................
..1
Changes
to
DC
Performance,
Input
Characteristics,
and
Power
Supply
Sections........................................................................
.........3 Changes to DC Performance, Input Characteristics, and Power Supply
Sections...............................http://www.wendangwang.com/doc/89eddaed80
358fd0fe9cbc7a..................................................4
Changes
to
Figure
20........................................................................8
Changes
to
Figure
49......................................................................13
Updated
Outline
Dimensions.......................................................16
Ordering
Changes
to
Guide..........................................................16
7/06—Rev. 0 to Rev. A
Added
ADA4853-2.............................................................Universal
Changes to Features and General Description.............................1 Changes
to
Table
1............................................................................3
Changes
to
Table
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2............................................................................4
Changes
to
Table
3............................................................................5
Changes
to
Figure
7.............................http://www.wendangwang.com/doc/89eddaed80358fd0fe9
cbc7a..............................................6 Changes to Figure 11 Caption,
Figure 12, Figure 13,
and
Figure
16..............................................................................
........7
Changes
to
Figure
17
and
Figure
19................................................8 Inserted Figure 21; Renumbered
Sequentially..............................8
Inserted
Sequentially..............................9
Figure
Changes
25;
Renumbered
to
Figure
28.........................................................................9
Changes to Figure 31 through Figure 35.....................................10
Changes to Figure 37, Figure 39 through Figure 42..................11 Inserted Figure
43 and Figure 46..................................................12 Inserted
Figure
47...........................................................................13
Changes
to
Circuit
Description
Section......................................1http://www.wendangwang.com/doc/89e
ddaed80358fd0fe9cbc7a3
Changes
Section.........................13
to
Changes
Headroom
Considerations
to
Figure
48......................................................................14
Updated
Dimensions.......................................................15
Outline
Changes
Ordering Guide..........................................................15
to
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1/06—Revision 0: Initial Version
Rev. B | Page 2 of 16
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ADA4853-1/ADA4853-2/ADA4853-3
SPECIFICATIONS
SPECIFICATIONS WITH 3 V SUPPLY
TA = 25°C, RF = 1 kΩ, RG = 1 kΩ for G =
2, RL = 150 Ω, unless otherwise noted.
Table 1.
Unit DYNAMIC PERFORMANCE
2, VO = 2 V p-p
150 Ω
22
=
32
?3 dB Bandwidth G =
MHz Bandwidth for 0.5 dB Flatness
MHz Settling Time to 0.1%
2
V
1, VO = 0.1 V p-p
VO = 2 V step
step
88
G =
45
90
MHz
G =
2, VO = 2 V p-p, RL =
ns Slew Rate G =
100
2, VO
V/μs
NOISE/DISTORThttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aION
PERFORMANCE
Ω
0.10
Differential Gain RL = 150 Ω
Degrees Input Voltage Noise f = 100 kHz
f = 100 kHz
2.2
dB DC PERFORMANCE
μV/°C
0.20
pA/√Hz Crosstalk G =
22
% Differential Phase RL = 150
nV/√Hz Input Current Noise
2, VO = 2 V p-p, RL = 150 Ω, f = 5 MHz
Input Offset Voltage
1 4 mV Input Offset Voltage Drift
?66
1.6
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Input Bias CurrentμA Input Bias Current Drift
50
nA Open-Loop Gain
VO = 0.5 V to 2.5 V 72 80
Resistance Differential/common mode
0.5/20
Common-Mode Voltage Range
?0.2 to
(Rise/Fall) VIN = ?0.5 V to
3.5 V, G =
= 0 V to 1 V ?69 ?85
1.4
4
dB
dB INPUT CHARACTERISTICS
MΩ Input Capacitance
VCC ? 1.2
1
40
120
0.6
Power-down
1.2
V Turn-Off Time
ns Power-Down Bias Current
VIN = ?0.25 V to
1.75 V, G =
Voltage Swing RL = 150 Ω 0.3 to 2.7 0.15 to 2.88
Sinking/sourcing
Quiescent Current
= low
150/120
pF Input
ns Common-Mode Rejection Ratio VCM
μA
OUTPUThttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a
Output Overdrive Recovery Time
Input
V Input Overdrive Recovery Time
Power-Down Input Voltage
μs Turn-On Time
nA/°C Input Bias Offset Current
mA POWER SUPPLY
μA
CHARACTERISTICS
2
70
ns Output
V Short-Circuit Current
Operating Range
2.65
5 V
1.3 1.6 mA/amplifier Quiescent Current (Power-Down) Power-down
0.1 1.5 μA Positive Power Supply Rejection
VS =
1.5 V to
2.5 V, ?VS = ?1.5
V ?76 ?86
dB Negative Power Supply Rejection ?VS = ?1.5 V to ?2.5 V,
V ?77 ?88
dB
VS =
1.5
Rev. B | Page 3 of 16
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ADA4853-1/ADA4853-2/ADA4853-3
SPECIFICATIONS WITH 5 V SUPPLY
TA = 25°C, RF = 1 kΩ, RG = 1 kΩ for G =
Table 2.
2, RL = 150 Ω, unless otherwise noted.
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Unit DYNAMIC PERFORMANCE
=
2, VO = 2 V p-p
?3 dB Bandwidth G =
35
1, VO = 0.1 V p-p
MHz Bandwidth for 0.5 dB Flatness
p-phttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a
to 0.1%
VO = 2 V step
54
ns Slew Rate G =
NOISE/DISTORTION PERFORMANCE
0.10
?66
22
2.2
1.6
Resistance Differential/common mode
V/μs
Degrees Input Voltage Noise f = 100 kHz
pA/√Hz Crosstalk G =
2, VO = 2 V
Input Offset Voltage
1
μV/°C
4
VO = 0.5 V to 4.5 V 72 80
Common-Mode Voltage Range
93 120
%
Input Bias CurrentμA Input Bias Current Drift
nA Open-Loop Gain
MHz Settling Time
2, VO = 2 V step
dB DC PERFORMANCE
4.1 mV Input Offset Voltage Drift
G
0.22
nV/√Hz Input Current Noise f = 100 kHz
60
22
MHz
2, VO = 2 V
Differential Gain RL = 150 Ω
Differential Phase RL = 150 Ω
p-p, RL = 150 Ω, f = 5 MHz
G =
100
0.5/20
nA/°C Input Bias Offset Current
dB INPUT CHARACTERISTICS
MΩ Input Capacitance
Input
0.6
pF Input
?0.2 to
VCC ? 1.2
Input Overdrive Recovery Time (Rise/Fall) VIN = ?0.5 V to
Common-Mode
Rejection
Ratio
VCM
=
0
V
to
3
5.5 V, G =
V
?71
1
?88
40
ns
dB
Powehttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7ar-Down Input Voltage
Power-down
Current
1.2
μA
VIN = ?0.25 V to
0.1 to 4.8
V Turn-Off Time
1.5
μA OUTPUT CHARACTERISTICS
2.75 V, G =
2
55
V Short-Circuit Current
Operating Range
2.65
2.5 V to
120
ns Power-Down Bias
Output Overdrive Recovery Time
ns Output Voltage Swing RL = 75 Ω 0.55 to 4.5
Sinking/sourcing
5 V Quiescent Current
Current (Power-Down) Power-down = low
VS =
μs Turn-On Time
160/120
mA POWER SUPPLY
1.4 1.8 mA/amplifier Quiescent
0.1 1.5 μA Positive Power Supply Rejection
3.5 V, ?VS = ?2.5 V ?75 ?80
dB Negative Power Supply Rejection ?VS
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= ?2.5 V to ?3.5 V,
VS =
2.5 V ?75 ?80
dB
Rev. B | Page 4 of 16
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ADA4853-1/ADA4853-2/ADA4853-3
ABSOLUTE MAXIMUM RATINGS
The power dissipated in the package (PD) for a sine wave and a resistor load is the
total power consumed from the supply
://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aarminus the load power.
Table
3.
Supply Voltage Power Dissipation
Common-Mode Input Voltage Differential Input Voltage Storage Temperature Range
Operating Temperature Range 6-Lead SC70
16-Lead LFCSP_VQ 14-Lead TSSOP Lead Temperature
5.5 V
Junction Temperature
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See Figure 6
?VS ? 0.2 V to
VS ? 1.2 V ±VS
?65°C to
125°C
?40°C to
85°C ?40°C to
105°C ?40°C to
105°C JEDEC J-STD-20 150°C
PD = Total Power Consumed ? Load Power
PD=VSUPPLYVOLTAGE×ISUPPLYCURRENT–RMS output voltages should be considered.
()
VOUT2
RL
Airflow increases heat dissipation, effectively reducing θJA.
In addition, more
metal directly in contact with the package leads and through holes under the device
reduces θJA. Figure 6 shows the maximum safe power dissipation in the package vs.
the
ambient
temperature
for
the
6-lead
(430°C/W),http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a
the
SC70
14-lead
TSSOP (120°C/W), and the 16-lead LFCSP_VQ (63°C/W) on a JEDEC standard 4-layer board.
θJA values are approximations.
3.0
M
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AXIMUM POWER DISSIPATION (W)
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage
to the device. This is a stress rating only; functional operation of the device at
these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2.5
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, θJA is
specified for the device soldered in the circuit board for surface-mount packages.
Table 4.
Package Type 6-Lead SC70
16-Lead LFCSP_VQ 14-Lead TSSOP
2.0
1.5
1.0
θJA430 63 120http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a Unit °C/W
°C/W °C/W
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0.5
–55
–35
–15
5
25
45
65
85
105
125
05884-059
Figure 6. Maximum Power Dissipation vs. Temperature for a 4-Layer Board
AMBIENT TEMPERATURE (°C)
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Maximum Power Dissipation
The maximum safe power dissipation for the ADA4853-1/ ADA4853-2/ADA4853-3 is limited
by the associated rise in junction temperature (TJ) on the die. At approximately
150°C, which is the glass transition temperature, the plastic changes its properties.
Even temporarily exceeding this temperature limit can change the stresses that the
package exerts on the die, permanently shifting the parametric performance of the
amplifiers. Exceeding a junction temperature of 150°C for an extended period can
result in changes in silicon devices, potentially causing degradation or loss of
functionality.
://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aparESD CAUTION
Rev. B | Page 5 of 16
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ADA4853-1/ADA4853-2/ADA4853-3
TYPICAL PERFORMANCE CHARACTERISTICS
2
5
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NORMALIZED CLOSED-LOOP GAIN (dB)
10–1
43
CLOSED-LOOP GAIN (dB)
210–1–2–3–4–5
05884-009
05884-010
–2–3
–4–5
–60.1
1
10
FREQUENCY (MHz)
100
200
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05884-00
6
–6
FREQUENCY (MHz)
Figure 7. Small Signal Frequency Response for Various Gains
32
CLOSED-LOOPGAIN(dB)
Figure 10. Small Signal Frequency Response for Various Capacitive Loads
6.5
6.46.3
CLOSED-LOOPGAIN(dB)
10–1–2–3–4–5
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FREQUENCY(MHz)
05884-007
6.26.1
6.05.95.85.75http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a.65.5FREQUEN
CY(MHz)
–6
Figure 8. Small Signal Frequency Response for Various Loads
432
CLOSED-LOOPGAIN(dB)
Figure 11. 0.5 dB Flatness Response for Various Output Voltages
8.0
7.87.6
CLOSED-LOOP GA
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IN (dB)
7.47.27.06.86.66.46.26.05.8
10–1–2–3–4–5
FREQUENCY(MHz)
0.1110
FREQUENCY (MHz)
1001000
Figure 9. Small Signal Frequency Response for Various Supplies
Figure 12. ADA4853-3 LFCSP_VQ Flatness Response for Various Output Voltages
Rev. B | Page 6 of 16
05884-060
05884-
008
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–65.6
元器件交易网 www.cecb2b.com
1
NORMALIZEDCLOSED-LOOPGAIN(dB)
ADA4853-1/ADA4853-2/ADA4853-3
4
–1–2–3–4–5
FREQUENCY(MHz)
CLOSED-LOOP GAIN(dhttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aB)
3
210–1–2–3–4–5
05884-011
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FREQUENCY (MHz)
05884-014
–6–6
Figure 13. Large Signal Frequency Response for Various Gains
7
Figure 16. Small Signal Frequency Response for Various Temperatures
250
SLEW RATE(V/?s)
6
CLOSED-LOOPGAIN(dB)
5
432
200
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150
100
50
1
FREQUENCY(MHz)
05884-012
OUTPUTVOLTAGESTEP(V)
05884-015
00
Figure 14. Large Signal Frequency Response for Various Loads
543
CLOSED-LOOP
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GAIN (dB)
Figure 17. Slew Rate vs. Output Voltage
140120100
8060
40200
05884-013
10–1–2–3–4–5–6FREQUENCY(MHz)
OPEN-LOOP GAIN (dB)
2
–
6http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a0–90–120–150–180–21
0–240
1k10k100k1M10M100M
FREQUENCY(Hz)
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05884-029
–20100
OPEN-LOOP PHASE (Degrees
)
0–30
Figure 15. Small Signal Frequency Response for Various Temperatures
Figure 18. Open-Loop Gain and Phase vs. Frequency
Rev. B | Page 7 of 16
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ADA4853-1/ADA4853-2/ADA4853-3
–20–30–40–50–60–70–80–90100
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CLOSED-LOOP OUTPUT IMPEDANCE (?)
COMMON-MODE REJECTION (dB)
100k
1k10k100k1M10M100M1k10k100k1M10M100M
FREQUENCY (Hz)
FREQUENCY (Hz)
05884-050
100
Figure 19. Common-Mode Rejection vs. Frequency
–10
POWER SUPPLY REJECTION (dB)
Figure 22. Output Impedance vs. Frequency Disabled
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–40–50://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a
HARMONICDISTORTION(dBc)
–20–30–40–50–60–70–80–90
05884-031
–60–70–80–90–100
1k10k100k1M10M100M
FREQUENCY (Hz)
-
FREQUENCY (MHz)
05884-01605884-017
–100
100
–110
Figure 20. Power Supply Rejection vs. Frequency
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1000
CLOSED-LOOP OUTPUT IMPEDANCE (?)
Figure 23. Harmonic Distortion vs. Frequency
–40–50
HARMONICDISTORTION(dBc)
100
–60–70–80–90–100–110–120
10
1
0.1
0.01
100
1k10k100k1M10M100M
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FREQUENCY (Hz)
FREQUENCY (MHz)
Figure 21. Output Impedance vs. Frequency Enabled
Figure 24. Harmonic Distortion vs. Frequency
Rev. B | Page 8 of 16
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–40–5http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a0
ADA4853-1/ADA4853-2/ADA4853-3
2.602.582.56
HARMONICDISTORTION(dBc)
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OUTPUT VOLTAGE (V)
–60
–70–80–90–100
–110–120
05884-018
2.542.522.502.482.462.442.42
05884-033
FREQUENCY (MHz)
2.40
Figure 28. Small Signal Pulse Response for Various Supplies
Figure 25. Harmonic Distortion vs. Frequency
–30
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–40
HARMONIC DISTORTION (dBc)
OUTPUT VO
LTAGE (V)
–50
–60–70–80–90–100
0.1
05884-034
1
FREQUENCY(MHz)
10
05884-051
Figure 29. Small Signal Pulse Response for Various Capacitive Loads
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3.75
Figure 26. Harmonic Distortion vs. Frequency
–40–50HARMONICDISTORTION
(dBc)
3.503.25
OUTPUThttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a VOLTAGE (V)
–60–70–80–90–100
3.002.752.502.252.001.75
05884-019
–120
VOUT (V p-p)
1.501.25
05884-035
–110
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Figure 30. Large Signal Pulse Response for Various Supplies
Figure 27. Harmonic Distortion for Various Output Voltages
Rev. B | Page 9 of 16
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ADA4853-1/ADA4853-2/ADA4853-3
3.753.503.25
1000
3.002.752.502.252.001.751.501.25
05884-036
VOLTAGE NOISE (nVHz)
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OUTPUT VOLTAGE (V)
100
1001k10k100k1M10M
FREQUENCY(Hz)
05884-03705884-038
1010
Figure 31. Large Signal Pulse Response for Various Capacitive Loads
100
Figure 34. Voltage Noise vs. Frequency
INPUT AND OUTPUT VOLTAGhttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aE
(V)
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CURRENT NOISE (pAHz)
05884-020
10
–0.5
100ns/DIV
110
1001k10k100k1M10M
FREQUENCY(Hz)
Figure 32. Output Overdrive Recovery
2018161412
Figure 35. Current Noise vs. Frequency
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INPUT AND OUTPUT VOLTAGE (V)
COUNT
108642
05884-042
05884-021
–0.5
100ns/DIV
0–4
–3–2–1
01234
VOFFSET (mV)
Figure 33. Input Overdrive Recovery
Figure 36. VOS Distribution
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Rev. B | Page 10 of 16
元器件交易网 www.cecb2b.com
–0.6
–0.8
INPUT BIAS CURRENT (?A)
ADA4853-1/ADA4853-2/ADA4853-3
–0.50–0.52–0.54–0.56–0.58–0.60–0.62–0.64
–0.66
05884-022
–1.0
VOS (mV)
–1.2–http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a1.4–1.6–1.8
–2.0
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VCM (V)
–20020406080
TEMPERATURE(°C)
05884-02705884-03905884-040
–0.68
–40
Figure 37. VOS vs. Common-Mode Voltage
1.5
3.0
Figure 40. Input Bias Current vs. Temperature
2.8
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SUPPLY CURRENT (mA)
OUTPUT VOLTAGE (V)
1.0
0.5
2.6
2.40.6
0.4
0.2
VOLTAGE(V)
05884-023
01
10
100
LOAD
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RESISTANCE(?)
1k
10k
Figure 38. Supply Current vs.
Voltage
–0.6
5.0
Figure 41. Output Voltage vs. Load Resistance
INPUT OFFSET VOLTAGE (mV
)
–0.7
4.8OUTPUT VOLTAGE (V)
05884-026
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4.6
–0.8
4.40.6://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7ar
0.4
–0.9
0.2
010
100
1k
10k
–1.0
TEMPERATURE (°C)
LOADRESISTANCE(?)
Figure 39. Input Offset Voltage vs. Temperature
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Figure 42. Output Voltage vs. Load Resistance
Rev. B | Page 11 of 16
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ADA4853-1/ADA4853-2/ADA4853-3
3.02.92.8
OUTPUT VOLTAGE (V)
3.03.12.92.82.7
VOLTAGE (V)
2.62.50.50.40.30.20.1
05884-041
2.62.52.42.3
2.22.12.0
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5101520253035404550LOADCURRENT(mA)
TIME(ns)
05884-045
1.9
2VINPUT –VOU
TPUT(V)
2.7
Figure 43. Output Voltage vs. Load Current
5.04.94.8
OUTPUT VOLTAGE (V)
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Figure
46.
0.1%
Timhttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7ae
POWER DOWN PIN VOLTAGE (V)
TIME (?s)
1
3
4.64.50.50.40.30.20.1
5
10
15
20
25
Settling
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30
35
40
45
50
05884-0
52
05884-04605884-054
LOADCURRENT(mA)
OUTPUTVOLTAGE(V)
4.72
Figure 44. Output Voltage vs. Load Current
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0.25
–40
Figure 47. Enable/Disable Time
OUTPUT SATURATION VOLTAGE (V)
0.20
–50
CROSSTALK (dB)
–60
0.15
–70
0.10
–80
0.05
–90
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–20020406080
05884-053
0–40–100
100k
1M10M
FREQUENCY (Hz)
100M200M
Figure
45.
Output
Saturation
Voltage
vs.
Temperature
Varioushttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a Supplies
TEMPERATURE(°C)
Figure 48. Crosstalk vs. Frequency
Rev. B | Page 12 of 16
for
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ADA4853-1/ADA4853-2/ADA4853-3
INPUT-TO-OUTPUT ISOLATION (dB)
110
FREQUENCY (MHz)
100200
05884-055
0.1
Figure 49. Input-to-Output Isolation, Chip Disabled
Rev. B | Page 13 of 16
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ADA4853-1/ADA4853-2/ADA4853-3
For signals approaching the negative supply and inverting gain and high positive gain
configurations,
the
headroom
limit
is
the
output
stage.
The
ADA4853-1/ADA4853-2/ADA4853-3 use a common-emitter output stage. This output stage
maximizes the available output range, limited by the saturation voltage of the output
transistors.
The
saturation
voltage
increases
with
the
drive
currhttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aent that the output
transistor is required to supply due to the output transistor’s collector
resistance.
As the saturation point of the output stage is approached, the output signal shows
increasing amounts of compression and clipping. As in the input headroom case, higher
frequency signals require a bit more headroom than the lower frequency signals. Figure
27 illustrates this point by plotting the typical distortion vs. the output amplitude.
CIRCUIT DESCRIPTION
The ADA4853-1/ADA4853-2/ADA4853-3 feature a high slew rate input stage that is a true
single-supply topology capable of sensing signals at or below the minus supply rail.
The rail-to-rail output stage can pull within 100 mV of either supply rail when driving
light loads and within 200 mV when driving 150 Ω. High speed performance is maintained
at supply voltages as low as 2.65 V.
HEADROOM CONSIDERATIONS
The
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ADA4853-1/ADA4853-2/http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aADA48
53-3 are designed for use in low voltage systems. To obtain optimum performance, it
is useful to understand the behavior of the amplifiers as input and output signals
approach their headroom limits. The amplifiers’ input common-mode voltage range
extends from the negative supply voltage (actually 200 mV below this) to within 1.2
V of the positive supply voltage.
Exceeding the headroom limits is not a concern for any inverting gain on any supply
voltage, as long as the reference voltage at the amplifiers’ positive input lies
within the amplifiers’ input common-mode range.
The input stage is the headroom limit for signals approaching the positive rail.
Figure 50 shows a typical offset voltage vs. the input common-mode voltage for the
ADA4853-1/ADA4853-2/ ADA4853-3 on a 5 V supply. Accurate dc performance is maintained
from approximately 200 mV below the negative supply to within 1.2 V of the positive
supply.
Fohttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7ar
high
speed
signals, however, there are other considerations. As the
common-mode voltage gets within 1.2 V of positive supply, the amplifier responds well
but the bandwidth begins to drop as the common-mode voltage approaches the positive
supply. This can manifest itself in increased distortion or settling time. Higher
frequency signals require more headroom than the lower frequencies to maintain
distortion performance.
–0.6
–0.8–1.0
VOS (mV)
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OVERLOAD BEHAVIOR AND RECOVERY
Input
The specified input common-mode voltage of the ADA4853-1/ ADA4853-2/ADA4853-3 is 200
mV below the negative supply to within 1.2 V of the positive supply. Exceeding the
top limit results in lower bandwidth and increased rise time. Pushing the input
voltage of a unity-gain follower to less than 1.2 V from the positive supply leads
to
an
increasing
amount
of
output
error
as
well
settlhttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aing
as
increased
time.
The
recovery time from input voltages 1.2 V or closer to the positive supply is
approximately 40 ns; this is limited by the settling artifacts caused by transistors
in the input stage coming out of saturation. The amplifiers do not exhibit phase
reversal, even for input voltages beyond the voltage supply rails. Going more than
0.6 V beyond the power supplies turns on protection diodes
greatly increasing the current draw of the devices.
–1.2–1.4–1.6–1.8
05884-022
–2.0
VCM (V)
Figure 50. VOS vs. Common-Mode Voltage, VS = 5 V
Rev. B | Page 14 of 16
at the input stage,
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ADA4853-1/ADA4853-2/ADA4853-3
LAYOUT
As is the case with all high speed applications, careful attention to printed circuit
board (PCB) layout details prevents associated board parasitics from becoming
problematic.
The
ADA4853-1/http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a
ADA4853-2/ADA4853-3 can operate up to 100 MHz; therefore, proper RF design techniques
must be employed. The PCB should have a ground plane covering all unused portions
of
the component side of the board to provide a low impedance return path. Removing
the ground plane on all layers from the area near and under the input and output pins
reduces stray capacitance. Signal lines connecting the feedback and gain resistors
should be kept as short as possible to minimize the inductance and stray capacitance
associated with these traces. Termination resistors and loads should be located as
close as possible to their respective inputs and outputs. Input and output traces
should be kept as far apart as possible to minimize
coupling (crosstalk) through the board. Adherence to microstrip or stripline design
techniques for long signal traces (greater than 1 inch) is recommended. For more
information
on
high
speed
board
layout,
go
to:http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7a www.analog.com to view
A Practical Guide to High-Speed Printed-Circuit-Board Layout.
APPLICATIONS
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SINGLE-SUPPLY VIDEO AMPLIFIER
With low differential gain and phase errors and wide 0.5 dB flatness, the
ADA4853-1/ADA4853-2/ADA4853-3 are ideal solutions for portable video applications.
Figure 51 shows a typical video driver set for a noninverting gain of
2, where
RF
= RG = 1 kΩ. The video amplifier input is terminated into a shunt 75 Ω resistor.
At the output, the amplifier has a series 75 Ω resistor for impedance matching to
the video load. When operating in low voltage, single-supply applications, the input
signal is only limited by the input stage headroom.
R05884-043
Figure 51. Video Amplifier
POWER SUPPLY BYPASSING
Attention
must
be
paid
to
ADA4853-1/ADA4853-2/ADA4853-3.
bypassing
High
the
quality
power
capacitors
supply
with
pins
low
of
the
equivalent
http://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aseries resistance (ESR),
such as multilayer ceramic capacitors (MLCCs), should be used to minimize supply
voltage ripple and power dissipation. A large, usually tantalum, 2.2 μF to 47 μF
capacitor located in proximity to the ADA4853-1/ADA4853-2/ADA4853-3 is required to
provide good decoupling for lower frequency signals. The actual value is determined
by the circuit transient and frequency requirements. In addition, 0.1 μF MLCC
decoupling capacitors should be located as close to each of the power supply pins
as is physically possible, no more than ? inch away. The ground returns should
terminate immediately into the ground plane. Locating the bypass capacitor return
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close to the load return minimizes ground loops and improves performance.
Rev. B | Page 15 of 16
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ADA4853-1/ADA4853-2/ADA4853-3
OUTLINE DIMENSIONS
0.10 COPLANARITY
PLANE
0.10://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aar
COMPLIANT TO JEDEC STANDARDS MO-203-AB
COMPLIANT TO JEDEC STANDARDS MO-153-AB-1
Figure 52. 6-Lead Thin Shrink Small Outline Transistor Package [SC70]
(KS-6)—Dimensions shown in millimeters
Figure 53. 14-Lead Thin Shrink Small Outline Package [TSSOP]
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(RU-14)—Dimensions shown in millimeters
0.500.400.900.850.80*COMPLIANTTOJEDEC STANDARDS MO-220-VEED-2
EXCEPT FOR EXPOSED PAD DIMENSION.
Figure 54. 16-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
3 mm × 3 mm Body, Very Thin Quad (CP-16-3)—Dimensions shown in millimeters
ORDERING GUIDE
Model
ADA4853-1AKSZ-R21ADA4853-1AKSZ-R71ADA4853-1AKSZ-RL1ADA4853-2YCPZ-R21ADA4853-2YCP
Z-RL1ADA4853-2YCPZ-RL71ADA4853-3YCPZ-R21ADA4853-3YCPZ-RL1ADA4853-3YCPZ-R71ADA485
3-3YRUZ1
ADA4853-3YRUZ-RL1ADA4853-3YRUZ-R71
1
Temperaturhttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7ae
Description –40°C to
85°C 6-Lead Thin Shrink Small Outline Transistor Package
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(SC70) –40°C to
–40°C to
to
85°C 6-Lead Thin Shrink Small Outline Transistor Package (SC70)
85°C 6-Lead Thin Shrink Small Outline Transistor Package (SC70) –40°C
105°C 16-Lead Lead Frame Chip Scale Package (LFCSP_VQ) –40°C to
16-Lead Lead Frame Chip Scale Package (LFCSP_VQ) –40°C to
Frame Chip Scale Package (LFCSP_VQ) –40°C to
Package (LFCSP_VQ) –40°C to
–40°C to
105°C
105°C 16-Lead Lead
105°C 16-Lead Lead Frame Chip Scale
105°C 16-Lead Lead Frame Chip Scale Package (LFCSP_VQ)
105°C 16-Lead Lead Frame Chip Scale Package (LFCSP_VQ) –40°C to
105°C 14-Lead Think Shrink Small Outline Package (TSSOP) –40°C to
Think Shrink Small Outline Package (TSSOP) –40°C to
105°C 14-Lead
105°C 14-Lead Think Shrink
Small Outline Package (TSSOP) Ordering Quantity 250 3,000 10,000 250 5,000 1,500 250
5,000 1,500 96 2,500 1,000 Package
KS-6 HEC Khttp://www.wendangwang.com/doc/89eddaed80358fd0fe9cbc7aS-6 HEC KS-6 HEC
CP-16-3 H0H CP-16-3 H0H CP-16-3 H0H CP-16-3 H0L CP-16-3 H0L CP-16-3 H0L RU-14
RU-14
RU-14
Z = Pb-free part.
?2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered
trademarks
D05884-0-10/06(B)
Rev. B | Page 16 of 16
are
the
property
of
their
respective
owners.
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