Download LTC1069-1 - Low Power, 8th Order Progressive Elliptic, Lowpass Filter

LTC1069-1
Low Power, 8th Order
Progressive Elliptic,
Lowpass Filter
DESCRIPTION
FEATURES
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8th Order Elliptic Filter in SO-8 Package
Operates from Single 3.3V to ±5V Power Supplies
–20dB at 1.2fCUTOFF
–52dB at 1.4fCUTOFF
–70dB at 2fCUTOFF
Wide Dynamic Range
110μVRMS Wideband Noise
3.8mA Supply Current with ±5V Supplies
2.5mA Supply Current with Single 5V Supply
2mA Supply Current with Single 3.3V Supply
APPLICATIONS
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The LTC®1069-1 is a monolithic 8th order lowpass filter
featuring clock-tunable cutoff frequency and 2.5mA power
supply current with a single 5V supply. An additional feature
of the LTC1069-1 is operation with a single 3.3V supply.
The cutoff frequency (fCUTOFF) of the LTC1069-1 is equal
to the clock frequency divided by 100. The gain at fCUTOFF
is –0.7dB and the typical passband ripple is ±0.15dB up
to 0.9fCUTOFF. The stopband attenuation of the LTC1069-1
features a progressive elliptic response reaching 20dB
attenuation at 1.2fCUTOFF, 52dB attenuation at 1.4fCUTOFF
and 70dB attenuation at 2fCUTOFF.
With ±5V supplies, the LTC1069-1 cutoff frequency can
be clock-tuned up to 12kHz; with a single 5V supply, the
maximum cutoff frequency is 8kHz.
Telecommunication Filters
Antialiasing Filters
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
The low power feature of the LTC1069-1 does not penalize the device’s dynamic range. With ±5V supplies and an
input range of 0.3VRMS to 2.5VRMS, the signal-to-(noise +
THD) ratio is ≥70dB. The wideband noise of the LTC1069-1
is 110μVRMS. Other filter responses with lower power or
higher speed can be obtained. Please contact LTC marketing for details.
The LTC1069-1 is available in 8-pin PDIP and 8-pin SO
packages.
TYPICAL APPLICATION
Frequency Response
10
Single 3.3V Supply 3kHz Elliptic Lowpass Filter
0
–10
+
AGND
0.47μF
3.3V
0.1μF
VOUT
VOUT
VIN
VIN
CLK
–20
GAIN (dB)
V–
V+
LTC1069-1
NC
NC
fCLK
300kHz
1069-1 TA01
–30
–40
–50
–60
–70
–80
1.5
3
6
4.5
FREQUENCY (kHz)
7.5
10691 TA02
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10691fa
1
LTC1069-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V+ to V–) .................................12V
Maximum Voltage at
Any Pin .............................(V– – 0.3V) ≤ V ≤ (V+ + 0.3V)
Operating Temperature Range
LTC1069C-1 ............................................. 0°C to 70°C
LTC1069I-1 .......................................... –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
8
VOUT
AGND 1
8
VOUT
2
7
V–
V+
2
7
V–
NC 3
6
NC
NC 3
6
NC
VIN 4
5
CLK
VIN 4
5
CLK
AGND 1
V
+
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 130°C/W
N8 PACKAGE
8-LEAD PLASTIC DIP
TJMAX = 110°C, θJA = 100°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LTC1069-1CN8#PBF
LTC1069-1
8-Lead Plastic DIP
0°C to 70°C
LTC1069-1IN8#PBF
LTC1069-1
8-Lead Plastic DIP
–40°C to 85°C
LTC1069-1CS8#PBF
LTC1069-1CS8#TRPBF
10691
8-Lead Plastic SO
0°C to 70°C
LTC1069-1IS8#PBF
LTC1069-1IS8#TRPBF
10691I
8-Lead Plastic SO
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. fCUTOFF is the filter’s cutoff frequency and is equal to fCLK/100. The
fCLK signal level is TTL or CMOS (clock rise or fall time ≤ 1μs), VS = 3.3V to ±5V, RL = 10k, unless otherwise noted. All AC gains are
measured relative to the passband gain.
PARAMETER
CONDITIONS
Passband Gain (fIN ≤ 0.25fCUTOFF)
VS = ±5V, fCLK = 500kHz
fTEST = 1.25kHz, VIN = 1VRMS
VS = 3.3V, fCLK = 200kHz
fTEST = 0.5kHz, VIN = 0.5VRMS
2
MIN
TYP
MAX
UNITS
l
–0.30
–0.35
0.2
0.70
0.75
dB
dB
l
–0.30
–0.35
0.2
0.70
0.75
dB
dB
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10691fa
LTC1069-1
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. fCUTOFF is the filter’s cutoff frequency and is equal to fCLK/100. The
fCLK signal level is TTL or CMOS (clock rise or fall time ≤ 1μs), VS = 3.3V to ±5V, RL = 10k, unless otherwise noted. All AC gains are
measured relative to the passband gain.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Gain at 0.50fCUTOFF
VS = ±5V, fCLK = 500kHz
fTEST = 2.5kHz, VIN = 1VRMS
l
–0.10
–0.11
–0.03
0.10
0.11
dB
dB
VS = 3.3V, fCLK = 200kHz
fTEST = 1kHz, VIN = 0.5VRMS
l
–0.10
–0.11
–0.03
0.10
0.11
dB
dB
VS = ±5V, fCLK = 500kHz
fTEST = 3.75kHz, VIN = 1VRMS
l
–0.20
–0.25
0.04
0.20
0.25
dB
dB
VS = 3.3V, fCLK = 200kHz
fTEST = 1.5kHz, VIN = 0.5VRMS
l
–0.20
–0.25
0.04
0.20
0.25
dB
dB
VS = ±5V, fCLK = 500kHz
fTEST = 4.5kHz, VIN = 1VRMS
l
–0.20
–0.25
–0.01
0.20
0.25
dB
dB
VS = 3.3V, fCLK = 200kHz
fTEST = 1.8kHz, VIN = 0.5VRMS
l
–0.20
–0.25
–0.01
0.20
0.25
dB
dB
VS = ±5V, fCLK = 500kHz
fTEST = 4.75kHz, VIN = 1VRMS
l
–0.30
–0.35
–0.05
0.30
0.35
dB
dB
VS = 3.3V, fCLK = 200kHz
fTEST = 1.9kHz, VIN = 0.5VRMS
l
–0.30
–0.35
–0.04
0.30
0.35
dB
dB
VS = ±5V, fCLK = 500kHz
fTEST = 5.0kHz, VIN = 1VRMS
l
–1.25
–1.35
–0.70
–0.25
–0.15
dB
dB
VS = 3.3V, fCLK = 200kHz
fTEST = 2.0kHz, VIN = 0.5VRMS
l
–1.25
–1.35
–0.61
–0.25
–0.15
dB
dB
VS = ±5V, fCLK = 500kHz
fTEST = 6.25kHz, VIN = 1VRMS
l
–30
–31
–27
–25
–24
dB
dB
VS = 3.3V, fCLK = 200kHz
fTEST = 2.5kHz, VIN = 0.5VRMS
l
–30
–31
–27
–25
–24
dB
dB
VS = ±5V, fCLK = 500kHz
fTEST = 7.5kHz, VIN = 1VRMS
l
–58
–59
–53
–50
–49
dB
dB
VS = 3.3V, fCLK = 200kHz
fTEST = 3kHz, VIN = 0.5VRMS
l
–58
–59
–53
–50
–49
dB
dB
30
20
15
150
100
mV
mV
mV
±4.0
±1.7
±0.9
3.25
1.25
0.60
V
V
V
3.8
2.5
2.0
5.5
4.5
3.5
mA
mA
mA
Gain at 0.75fCUTOFF
Gain at 0.90fCUTOFF
Gain at 0.95fCUTOFF
Gain at fCUTOFF
Gain at 1.25fCUTOFF
Gain at 1.50fCUTOFF
Output DC Offset (Input at AGND)
VS = ±5V, fCLK = 500kHz
VS = 4.75V, fCLK = 400kHz
VS = 3.3V, fCLK = 200kHz
Output Voltage Swing
VS = ±5V
VS = 4.75V
VS = 3.3V
l
l
l
Power Supply Current
VS = ±5V, fCLK = 500kHz
VS = 4.75V, fCLK = 400kHz
VS = 3.3V, fCLK = 200kHz
l
l
l
Maximum Clock Frequency
VS = ±5V
VS = 4.75V
VS = 3.3V
–3.25
–1.50
–0.70
1.2
0.8
0.5
Input Frequency Range
0
Input Resistance
30
Operating Power Supply Voltage
±1.57
43
MHz
MHz
MHz
fCLK/2
MHz
70
kΩ
±5.5
V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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10691fa
3
LTC1069-1
TYPICAL PERFORMANCE CHARACTERISTICS
Transition Band Gain vs
Frequency
Passband Gain vs Frequency
1.0
VS = ±5V
fCLK = 500kHz
fC = 5kHz
VIN = 2VRMS
0.6
–70
VS = ±5V
fCLK = 500kHz
fC = 5kHz
VIN = 2VRMS
0
–10
–20
0.2
–30
GAIN (DB)
0.4
0
–0.2
–76
–40
–50
–80
–82
–84
–0.6
–70
–86
–0.8
–80
–88
–1.0
–90
5
6
7
8
9
FREQUENCY (kHz)
10
1.5
Passband Gain vs Clock
Frequency, VS = ±5V
1.0
fCLK = 750kHz
fC = 7.5kHz
GAIN (dB)
0.5
2.0
VS = SINGLE 5V
VIN = 1.2VRMS
0
–0.5
0
–0.5
fCLK = 500kHz
fC = 5kHz
–1.0
–2.0
0.5
2.5
1.5
3.5
4.5
5.5
6.5
7.5
FREQUENCY (kHz)
0.5
0
fCLK = 500kHz
fC = 5kHz
–0.5
fCLK = 500kHz
fC = 5kHz
–1.0
–1.5
fCLK = 1.5MHz
fC = 15kHz
1.0
fCLK = 1MHz
fC = 10kHz
fCLK = 750kHz
fC = 7.5kHz
0.5
VS = ±5V
VIN = 2VRMS
1.5
GAIN (dB)
1.0
–1.5
–1.5
–2.0
0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5
FREQUENCY (kHz)
–2.0
3
1
5
7
9
11
13
15
FREQUENCY (kHz)
10691 G05
10691 G06
Phase and Group Delay vs
Frequency
Gain vs Supply Voltage
fCLK = 1MHz
fC = 10kHz
–1.0
10691 G04
Transient Response
0
10
fCLK = 500kHz
VIN = 0.5VRMS
0
VS = SINGLE 5V
fCLK = 500kHz
fC = 5kHz
–90
–10
PHASE
0.6
PHASE (DEG)
–30
–40
–50
–60
–70
VS = 3.3V
–80
VS = 5V
3
5
0.5
–360
0.4
–450
0.3
–540
0.1
–720
7 9 11 13 15 17 19 21
FREQUENCY (kHz)
10691 G07
0
0
1
2
1V/DIV
0.2
GROUP DELAY
–630
VS = ±5V
1
–270
GROUP DELAY (ms)
–180
–20
4
10691 G03
2.0
VS = SINGLE 3.3V
VIN = 0.5VRMS
1.5
11 12 13 14 15 16 17 18 19 20 21
FREQUENCY (kHz)
Passband Gain vs Clock
Frequency, VS = Single 5V
2.0
–90
–90
11
10691 G02
Passband Gain vs Clock
Frequency, VS = Single 3.3V
GAIN (dB)
–78
–60
10691 G01
GAIN (dB)
–74
–0.4
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
FREQUENCY (kHz)
VS = ±5V
fCLK = 500kHz
fC = 5kHz
VIN = 2VRMS
–72
GAIN (dB)
0.8
GAIN (dB)
Stopband Gain vs Frequency
10
3
4
5
6
7
FREQUENCY (kHz)
0.2ms/DIV
VS = ±5V
fCLK = 1MHz
fIN = 500Hz
4VP-P SQUARE WAVE
10691 G09
10691 G08
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10691fa
LTC1069-1
TYPICAL PERFORMANCE CHARACTERISTICS
Dynamic Range
THD + Noise vs VIN (VRMS)
THD + Noise vs Frequency
fCLK = 500kHz
fIN = 1kHz
–50
VS =
5V
–55
–60
VS =
±5V
VS = 3.3V
–65
–40
fCLK = 500kHz
VIN = 300mVRMS
–62
THD + NOISE (dB)
–45
THD + NOISE (dB)
THD + Noise vs Frequency
–60
–70
–75
–64
–50
–66
–55
–68
VS = ±5V
–70
–72
VS = 3.3V
–74
VS = 5V
–70
–75
–80
–85
–78
–85
–80
1.0
2.0
5.0
2.67
0.65 1.22
INPUT VOLTAGE (VRMS)
10691 G10
0.3
1
2
3
INPUT FREQUENCY (kHz)
4
–90
5
VS = 3.3V
VIN = 0.5VRMS
–65
–76
VS = 5V
VIN = 1VRMS
VS = ±5V
VIN = 2VRMS
1
2
3
INPUT FREQUENCY (kHz)
10691 G11
4
5
10691 G12
Supply Current vs Clock
Frequency
Supply Current vs Supply Voltage
Output Voltage Swing vs
Temperature
5
5
fCLK = 10Hz
5.0
25°C
3
85°C
–40°C
2
4.5
VS = ±5V
4.0
3.5
3.0
2.5
1
4
OUTPUT VOLTAGE SWING (V)
SUPPLY CURRENT (mA)
4
SUPPLY CURRENT (mA)
–60
–80
–90
0.1
fCLK = 500kHz
–45
THD + NOISE (dB)
–40
VS = 5V
VS = 3.3V
1
3
4
5
2
TOTAL SUPPLY VOLTAGE (±V)
6
10691 G13
VS = ±2.5V
2
1
VS = ±1.57V
0
VS = ±1.57V
–1
–2
VS = ±2.5V
–3
–4
2.0
0
0
VS = ±5V
3
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.2
CLOCK FREQUENCY (MHz)
–5
VS = ±5V
–40
10691 G14
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–20
0
20
40
60
AMBIENT TEMPERATURE (°C)
80
10691 G15
10691fa
5
LTC1069-1
PIN FUNCTIONS
AGND (Pin 1): Analog Ground. The quality of the analog
signal ground can affect the filter performance. For either
single or dual supply operation, an analog ground plane
surrounding the package is recommended. The analog
ground plane should be connected to any digital ground
at a single point. For dual supply operation Pin 1 should
be connected to the analog ground plane.
For single supply operation Pin 1 should be bypassed to
the analog ground plane with a 0.47μF or larger capacitor. An internal resistive divider biases Pin 1 to 1/2 the
total power supply. Pin 1 should be buffered if used to
bias other ICs. Figure 1 shows the connections for single
supply operation.
V+, V– (Pins 2, 7): Power Supply Pins. The V+ (Pin 2) and
the V– (Pin 7) should be bypassed with a 0.1μF capacitor
to an adequate analog ground. The filter’s power supplies
should be isolated from other digital or high voltage analog
supplies. A low noise linear supply is recommended. Using
switching power supplies will lower the signal-to-noise
ratio of the filter. Unlike previous monolithic filters, the
power supplies can be applied at any order, that is, the
positive supply can be applied before the negative supply
and vice versa. Figure 2 shows the connection for dual
supply operation.
NC (Pins 3, 6): No Connection. Pins 3 and 6 are not connected to any internal circuity; they should be preferably
tied to ground.
VIN (Pin 4): Filter Input Pin. The filter input pin is internally
connected to the inverting input of an op amp through a
43k resistor.
1
0.47μF
V+
0.1μF
VIN
AGND
2
8
VOUT
VIN
Table 1. Clock Source High and Low Thresholds
POWER SUPPLY
HIGH LEVEL
LOW LEVEL
Dual Supply = ±5V
1.5V
0.5V
Single Supply = 10V
6.5V
5.5V
Single Supply = 5V
1.5V
0.5V
Single Supply = 3.3V
1.2V
0.5V
VOUT (Pin 8): Filter Output Pin. Pin 8 is the output of the
filter and it can source or sink 1mA. Driving coaxial cables
or resistive loads less than 20k will degrade the total harmonic distortion of the filter. When evaluating the device’s
dynamic range, a buffer is required to isolate the filter’s
output from coax cables and instruments.
1
VOUT
7
V–
V+
LTC1069-1
3
6
NC
NC
4
CLK (Pin 5): Clock Input Pin. Any TTL or CMOS clock source
with a square wave output and 50% duty cycle (±10%) is
an adequate clock source for the device. The power supply
for the clock source should not necessarily be the filter’s
power supply. The analog ground of the filter should be
connected to clock’s ground at a single point only. Table 1
shows the clock’s low and high level threshold value for a
dual or a single supply operation. A pulse generator can be
used as a clock source provided the high level ON time is
greater than 0.42μs (VS = ±5V). Sine waves less than 100kHz
are not recommended for clock signal because excessive
slow clock rise or fall times generate internal clock jitter.
The maximum clock rise or fall is 1μs. The clock signal
should be routed from the right side of the IC package to
avoid coupling into any input or output analog signal path.
A 1k resistor between the clock source and the clock input
pin (5) will slow down the rise and fall times of the clock
to further reduce charge coupling, Figure 1.
VIN
DIGITAL
GROUND
PLANE
4
VIN
STAR
SYSTEM
GROUND
1k
DIGITAL
GROUND
PLANE
CLOCK
SOURCE
V–
0.1μF
5
CLK
1k
CLOCK
SOURCE
10691 F01
Figure 1. Connections for Single Supply Operation
6
VOUT
ANALOG GROUND PLANE
ANALOG GROUND PLANE
STAR
SYSTEM
GROUND
8
VOUT
7
V–
V+
LTC1069-1
3
6
NC
NC
V+
0.1μF
5
CLK
AGND
2
10691 F02
Figure 2. Connections for Dual Supply Operation
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10691fa
LTC1069-1
APPLICATIONS INFORMATION
Temperature Behavior
The power supply current of the LTC1069-1 has a positive
temperature coefficient. The GBW product of its internal
op amps is nearly constant and the speed of the device
does not degrade at high temperatures. Figures 3a, 3b and
3c show the behavior of the maximum passband of the
device for various supplies and temperatures. The filter,
especially at ±5V supply, has a passband behavior which
is nearly temperature independent.
Any parasitic switching transients during the rise and
fall edges of the incoming clock are not part of the clock
feedthrough specifications. Switching transients have
frequency contents much higher than the applied clock;
their amplitude strongly depends on scope probing techniques as well as grounding and power supply bypassing.
The clock feedthrough can be reduced, if bothersome, by
adding a single RC lowpass filter at the output pin (8) of
the LTC1069-1.
Clock Feedthrough
Wideband Noise
The clock feedthrough is defined as the RMS value of the
clock frequency and its harmonics that are present at the
filter’s output pin (8). The clock feedthrough is tested with
the input pin (4) shorted to the AGND pin and depends on
PC board layout and on the value of the power supplies.
With proper layout techniques the values of the clock
feedthrough are shown on Table 2.
The wideband noise of the filter is the total RMS value
of the device’s noise spectral density and determines the
operating signal-to-noise ratio. Most of the wideband
noise frequency contents lie within the filter passband.
The wideband noise cannot be reduced by adding post
filtering. The total wideband noise is nearly independent
of the clock frequency and depends slightly on the power
supply voltage (see Table 3). The clock feedthrough speci
fications are not part of the wideband noise.
Table 2. Clock Feedthrough
VS
CLOCK FEEDTHROUGH
3.3V
10μVRMS
5V
40μVRMS
±5V
160μVRMS
2.0
1.5
TA = 25°C
WIDEBAND NOISE
3.3V
100μVRMS
5V
108μVRMS
±5V
112μVRMS
0
TA = –40°C
–0.5
0.5
VS = ±5V
fCLK = 1.5MHz
VIN = 2VRMS
1.5
1.0
TA = 85°C
0.5
2.0
VS = 5V
fCLK = 1MHz
VIN = 1.2VRMS
1.0
TA = 85°C
TA = 85°C
TA = 25°C
GAIN (dB)
1.0
GAIN (dB)
VS
2.0
VS = 3.3V
fCLK = 750kHz
VIN = 0.5VRMS
GAIN (dB)
1.5
Table 3. Wideband Noise
0
–0.5
0.5
TA = –40°C
TA = 25°C
0
–0.5
TA = –40°C
–1.0
–1.0
–1.0
–1.5
–1.5
–1.5
–2.0
0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5
FREQUENCY (kHz)
–2.0
–2.0
0.5
1.5
2.5
3.5
4.5
5.5
6.5
7.5
FREQUENCY (kHz)
10691 F03a
Figure 3a
1
3
5
7
9
10691 F03b
Figure 3b
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11
13
15
FREQUENCY (kHz)
10691 F03c
Figure 3c
10691fa
7
LTC1069-1
APPLICATIONS INFORMATION
Aliasing
Table 4. Aliasing (fCLK = 100kHz)
INPUT FREQUENCY
(VIN = 1VRMS)
(kHz)
Aliasing is an inherent phenomenon of sampled data
systems and it occurs for input frequencies approaching
the sampling frequency. The internal sampling frequency
of the LTC1069-1 is 100 times its cutoff frequency. For
instance, if a 98kHz, 100mVRMS signal is applied at the
input of an LTC1069-1 operating with a 100kHz clock, a
2kHz, 28μVRMS alias signal will appear at the filter output.
Table 4 shows details.
OUTPUT LEVEL
(Relative to Input)
(dB)
OUTPUT FREQUENCY
(Aliased Frequency)
(kHz)
fCLK/fC = 100:1, fCUTOFF = 1kHz
96
97
98
98.5
99
99.5
–90.0
–86.0
–71.0
–56.0
–1.1
–0.21
(or 104)
(or 103)
(or 102)
(or 101.5)
(or 101)
(or 100.5)
4.0
3.0
2.0
1.5
1.0
0.5
TYPICAL APPLICATIONS
Single 5V Operation with Power Shutdown
5V
SHUTDOWN
ON
CMOS LOGIC
1
2
0.47μF
0.1μF
3
4
VIN
AGND
VOUT
8
VOUT
7
V–
+
V
LTC1069-1
6
NC
NC
VIN
CLK
5
fCLK ≤
750kHz
5V
0V
1069-1 TA04
Single 3.3V Supply Operation with Output Buffer
3.3V
0.1μF
1
0.47μF
0.1μF
VIN
8
AGND
VOUT
8
+
2
7
V–
V+
LTC1069-1
3
6
NC
NC
4
VIN
CLK
5
1/2 LT1366
VOUT
–
fCLK
500kHz
3.3V
0V
10691 TA05
www.BDTIC.com/Linear
10691fa
LTC1069-1
PACKAGE DESCRIPTION
N Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
.255 ± .015*
(6.477 ± 0.381)
.300 – .325
(7.620 – 8.255)
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
(
+.035
.325 –.015
8.255
+0.889
–0.381
.130 ± .005
(3.302 ± 0.127)
.045 – .065
(1.143 – 1.651)
)
.120
(3.048) .020
MIN (0.508)
MIN
.018 ± .003
.100
(2.54)
BSC
(0.457 ± 0.076)
N8 1002
NOTE:
1. DIMENSIONS ARE
INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.050 BSC
8
.245
MIN
7
6
5
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
× 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
2
3
4
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SO8 0303
10691fa
9
LTC1069-1
TYPICAL APPLICATION
Dual Supply Operation
–45
fIN = 1kHz
–50
AGND
VOUT
8
VOUT
2
7
V–
V+
LTC1069-1
0.1μF
3
6
NC
NC
5V
0.1μF
VIN
4
VIN
CLK
5
–5V
fCLK
500kHz
5V
0V
THD + NOISE (dB)
–55
1
fC = 5kHz
–60
–65
–70
–75
–80
–85
0.1
1
INPUT VOLTAGE (VRMS)
3
10691 TA03
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1068
Very Low Noise, High Accuracy, Quad Universal Filter Building Block
User-Configurable, SSOP Package
LTC1069-6
Single Supply, Very Low Power, Elliptic LPF
50:1 fCLK/fC Ratio, 8-Pin SO Package
LTC1164-5
Low Power 8th Order Butterworth LPF
100:1 and 50:1 fCLK/fC Ratio
LTC1164-6
Low Power 8th Order Elliptic LPF
100:1 and 50:1 fCLK/fC Ratio
LTC1164-7
Low Power 8th Order Linear Phase LPF
100:1 and 50:1 fCLK/fC Ratio
Corporation
www.BDTIC.com/Linear
10 Linear Technology
10691fa
LT 0309 REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 1996