Download LTC1069-7 - Linear Phase 8th Order Lowpass Filter

LTC1069-7
Linear Phase
8th Order Lowpass Filter
FEATURES
n
n
n
n
n
n
n
8th Order, Linear Phase Filter in SO-8 Package
Raised Cosine Amplitude Response
– 43dB Attenuation at 2× fCUTOFF
Wideband Noise: 140μVRMS
Operates from Single 5V Supply to
±5V Power Supplies
Clock-Tunable to 200kHz with ±5V Supplies
Clock-Tunable to 120kHz with Single 5V Supply
APPLICATIONS
n
n
n
Digital Communication Filter
Antialiasing Filter with Linear Phase
Smoothing Filters
cutoff frequency of the LTC1069-7 is set by an external
clock and is equal to the clock frequency divided by 25.
The ratio of the internal sampling frequency to the cutoff
frequency is 50:1 that is, the input signal is sampled
twice per clock cycle to lower the risk of aliasing. The
LTC1069-7 can be operated from a single 5V supply up
to dual ±5V supplies.
The gain and phase response of the LTC1069-7 can be
used in digital communication systems where pulse
shaping and channel bandwidth limiting must be carried
out. Any system that requires an analog filter with linear
phase and sharper roll off than conventional Bessel filters
can use the LTC1069-7.
The LTC1069-7 has a wide dynamic range. With ±5V
supplies and an input range of 0.1VRMS to 2VRMS, the
signal-to-(noise + THD) ratio is ≥ 60dB. The wideband noise
of the LTC1069-7 is 140μVRMS. Unlike other LTC1069-X filters,
the typical passband gain of the LTC1069-7 is equal to –1V/V.
DESCRIPTION
The LTC®1069-7 is a monolithic, clock-tunable, linear
phase, 8th order lowpass filter. The amplitude response
of the filter approximates a raised cosine filter with an
alpha of one. The gain at the cutoff frequency is – 3dB and
the attenuation at twice the cutoff frequency is 43dB. The
The LTC1069-7 is available in an SO-8 package.
Other filter responses with lower power/speed specifications
can be obtained. Please contact LTC Marketing.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Frequency Response
10
Single 5V Supply, Linear Phase 100kHz Lowpass Filter
0
AGND
VOUT
VOUT
–10
5V
0.1μF
V–
GAIN (dB)
V+
0.47μF
LTC1069-7
VIN
NC
NC
VIN
CLK
fCLK = 2.5MHz
1069-7 TA01
–20
–30
–40
–50
–60
–70
10
100
FREQUENCY (kHz)
1000
1069-7 TA02
www.BDTIC.com/Linear
10697fa
1
LTC1069-7
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
Total Supply Voltage (V + to V –) ............................... 12V
Power Dissipation .............................................. 400mW
Operating Temperature Range
LTC1069-7C ............................................ 0°C to 70°C
LTC1069-7I ......................................... – 40°C to 85°C
Storage Temperature..............................–65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
TOP VIEW
AGND 1
8
VOUT
V+
2
7
V–
NC 3
6
NC
VIN 4
5
CLK
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 130°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC1069-7CS8#PBF
LTC1069-7CS8#TRPBF
10697
8-Lead Plastic SO
0°C to 70°C
LTC1069-7IS8#PBF
LTC1069-7IS8#TRPBF
10697I
8-Lead Plastic SO
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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 specifications which apply over the full operating
temperature range. fCUTOFF is the filter’s cutoff frequency and is equal to fCLK/25. The fCLK signal level is TTL or CMOS (max clock rise
or fall time ≤ 1μs), RL = 10k, TA = 25°C, unless otherwise specified. All AC gains are measured relative to the passband gain.
SYMBOL
CONDITIONS
Passband Gain (fIN ≤ 0.2fCUTOFF)
VS = ± 5V, fCLK = 2.5MHz
fTEST = 1kHz, VIN = 1VRMS
l
VS = 4.75V, fCLK = 500kHz
fTEST = 1kHz, VIN = 0.5VRMS
l
VS = ± 5V, fCLK = 2.5MHz
fTEST = 25kHz, VIN = 1VRMS
l
–0.55
VS = 4.75V, fCLK = 500kHz
fTEST = 5kHz, VIN = 0.5VRMS
l
–0.30
VS = ± 5V, fCLK = 2.5MHz
fTEST = 50kHz, VIN = 1VRMS
l
–1.40
VS = 4.75V, fCLK = 500kHz
fTEST = 10kHz, VIN = 0.5VRMS
l
–0.60
VS = ± 5V, fCLK = 2.5MHz
fTEST = 75kHz, VIN = 1VRMS
l
–2.1
VS = 4.75V, fCLK = 500kHz
fTEST = 15kHz, VIN = 0.5VRMS
l
–1.15
VS = ± 5V, fCLK = 2.5MHz
fTEST = 100kHz, VIN = 1VRMS
l
–4.0
VS = 4.75V, fCLK = 500kHz
fTEST = 20kHz, VIN = 0.5VRMS
l
–3.3
Gain at 0.25fCUTOFF
Gain at 0.50fCUTOFF
Gain at 0.75fCUTOFF
Gain at fCUTOFF
2
MIN
www.BDTIC.com/Linear
TYP
MAX
UNITS
–0.10
±0.75
±0.90
dB
dB
–0.10
±0.75
±0.90
dB
dB
–0.1
dB
dB
0.15
dB
dB
–0.35
dB
dB
0
dB
dB
–0.80
dB
dB
–0.25
dB
dB
–2.7
dB
dB
–2.4
dB
dB
–0.30
–0.05
–1.0
–0.30
–1.65
–0.75
–3.5
–2.9
10697fa
LTC1069-7
ELECTRICAL CHARACTERISTICS
The l denotes specifications which apply over the full operating
temperature range. fCUTOFF is the filter’s cutoff frequency and is equal to fCLK/25. The fCLK signal level is TTL or CMOS (max clock rise
or fall time ≤ 1μs), RL = 10k, TA = 25°C, unless otherwise specified. All AC gains are measured relative to the passband gain.
SYMBOL
CONDITIONS
Gain at 1.5fCUTOFF
VS = ± 5V, fCLK = 2.5MHz
fTEST = 150kHz, VIN = 1VRMS
–19
VS = 4.75V, fCLK = 500kHz
fTEST = 30kHz, VIN = 0.5VRMS
–20
VS = ± 5V, fCLK = 2.5MHz
fTEST = 200kHz, VIN = 1VRMS
–55
VS = 4.75V, fCLK = 500kHz
fTEST = 40kHz, VIN = 0.5VRMS
–48
Gain at 2.0fCUTOFF
MIN
TYP
MAX
UNITS
–16.5
–14
dB
dB
–17
dB
dB
–38
dB
dB
–39
dB
dB
–55
dB
–18.1
–43
–41
Gain at 5.0fCUTOFF
VS = 4.75V, fCLK = 500kHz
fTEST = 100kHz, VIN = 0.5VRMS
Gain at fCUTOFF (160kHz)
VS = ±5V, fCLK = 4MHz
fTEST = 160kHz, VIN = 1VRMS
Phase at 0.5fCUTOFF
VS = ±5V, fCLK = 2.5MHz
fTEST = 50kHz
–35
–30.5
–25
Deg
Phase at fCUTOFF
VS = ±5V, fCLK = 2.5MHz
fTEST = 100kHz
–240
–235
–230
Deg
Passband Phase Deviation from
Linear Phase (Note 1)
VS = ±5V, fCLK = 500kHz
Output DC Offset (Input at GND)
VS = ±5V, fCLK = 500kHz
VS = 4.75V, fCLK = 400kHz
–70
–2.1
50
25
VS = ±5V, ISOURCE/ISINK ≤ 1mA, RL = 10k
VS = 4.75V, ISOURCE/ISINK ≤ 1mA, RL = 10k
Power Supply Current
VS = ± 5V, fCLK = 500kHz
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.
Note 2: Phase Deviation = 1/2(Phase at 0Hz – Phase at fCUTOFF) – (Phase
at 0Hz – Phase at 0.5fCUTOFF)
Phase at 0Hz = 180° (guaranteed by design)
dB
–3.0
Output Voltage Swing
VS = 4.75V, fCLK = 400kHz
–59
l
l
l
l
±3.5
2.6
Deg
mV
mV
125
±4.0
3.6
V
VP-P
18
26
29
mA
mA
13
15
16.5
mA
mA
Example: An LTC1069-7 has Phase at 0.5fCUTOFF = – 30.5° and Phase at
fCUTOFF = –235°.
Passband Phase Deviation from Linear Phase
= 1/2[180° – (–235°)] – [(180° – (–30.5°)] = –3°
www.BDTIC.com/Linear
10697fa
3
LTC1069-7
TYPICAL PERFORMANCE CHARACTERISTICS
Passband Gain vs Frequency
VS = ±5V
fCLK = 500kHz
fC = 20kHz
VIN = 2VRMS
0.5
0
–0.5
–40
VS = ±5V
fCLK = 500kHz
fC = 20kHz
VIN = 2VRMS
0
–44
–46
–2.0
GAIN (dB)
–1.5
–20
–30
–2.5
–3.0
3
5
7 9 11 13 15 17 19 21
FREQUENCY (kHz)
–60
21 23 25 27 29 31 33 35 37 39 41
FREQUENCY (kHz)
–20
–30
Passband Gain vs Frequency
1.0
3
fCLK = 5MHz
0
–3
–40
–0.5
–6
fCLK = 2.5MHz
fCLK = 4.5MHz
fCLK = 4MHz
fCLK = 3.5MHz
–9
–12
–50
–15
–60
–18
20
10
FREQUENCY (kHz)
100
60
–3.5
80 100 120 140 160 180 200
FREQUENCY (kHz)
fCLK = 2MHz
fC = 80kHz
VIN = 0.5VRMS
0
–9
–12
–15
10 30 50 70 90 110 130 150 170 190 210
FREQUENCY (kHz)
1069-7 G07
GAIN (dB)
GAIN (dB)
–6
–18
20
fCLK = 2.5MHz
–1.0
–1.5
TA = –40°C
–2.0
TA = 25°C
–2.5
–3.0
fCLK = 2MHz
–3.5
fCLK = 1.5MHz
TA = 85°C
–0.5
fCLK = 3MHz
–60
160
0.5
–3
VS = ±5V
130
Passband Gain vs Frequency
VS = 5V
VIN = 1VRMS
0
–10
VS = 5V
100
70
FREQUENCY (kHz)
1.0
3
10
–40
40
10
1069-7 G06
Passband Gain
vs Clock Frequency
–30
TA = 25°C
1069-7 G05
Gain vs Supply Voltage
–20
TA = –40°C
–2.0
–4.0
1069-7 G04
GAIN (dB)
–1.5
–3.0
VS = ±5V
VIN = 2VRMS
40
TA = 85°C
–1.0
–2.5
fCLK = 3MHz
1
VS = ±5V
fCLK = 4MHz
fC = 160kHz
VIN = 2VRMS
0.5
0
GAIN (dB)
GAIN (dB)
–10
1069-7 G03
Passband Gain
vs Clock Frequency
VS = ±5V
fCLK = 250kHz
fC = 10kHz
VIN = 1VRMS
0
41 45 49 53 57 61 65 69 73 77 81
FREQUENCY (kHz)
1069-7 G02
GAIN (dB)
1
10
4
–52
–58
–50
Gain vs Frequency
–50
–50
–56
–40
1069-7 G01
0
–48
–54
–3.5
–4.0
VS = ±5V
fCLK = 500kHz
fC = 20kHz
VIN = 2VRMS
–42
–10
–1.0
GAIN (dB)
GAIN (dB)
Stopband Gain vs Frequency
Transition Band Gain vs Frequency
10
1.0
VS = 5V
fCLK = 2.5MHz
fC = 100kHz
VIN = 1VRMS
–4.0
40
60
80 100 120 140 160 180 200
FREQUENCY (kHz)
10 20
1069-7 G08
www.BDTIC.com/Linear
30
40 50 60 70
FREQUENCY (kHz)
80
90 100
1069-7 G09
10697fa
LTC1069-7
TYPICAL PERFORMANCE CHARACTERISTICS
Passband Gain and Delay
vs Frequency
Passband Gain and Phase
vs Frequency
VS = ±5V
fCLK = 2.5MHz
fC = 100kHz
1
0
135
1
90
0
45
–1
0
GAIN
–3
–45
–4
–90
PHASE
12.5
–3
–4
–135
–5
–6
–180
–6
–7
–225
–7
–8
–270
10 20 30 40 50 60 70 80 90 100
FREQUENCY (kHz)
–8
12.0
DELAY
11.5
11.0
10 20 30 40 50 60 70 80 90 100
FREQUENCY (kHz)
0
1069-7 G12
1069-7 G10
Phase Matching vs Frequency
–40
fCLK = 1MHz
fC = 40kHz
fIN = 1kHz
–45
1.75
25°C
1.50
1.25
1.00
0.50
0.25
0
VS = ±5V
fCLK ≤ 2.5MHz
PHASE DIFFERENCE BETWEEN
ANY TWO UNITS (SAMPLE OF
20 REPRESENTATIVE UNITS)
THD + NOISE (dB)
2.00
–50
–50
–55
VS = 5V
–60
–65
–55
VS = 5V, VIN = 1VP-P
–60
–65
–70
VS = ±5V
–70
–75
–75
0.1
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
FREQUENCY (fCUTOFF/FREQUENCY)
fCLK = 2.5MHz
fC = 100kHz
–45
THD + NOISE (dB)
70°C
1
INPUT (VP-P)
VS = ±5V, VIN = 2VP-P
–80
10
1
10
FREQUENCY (kHz)
1609-7 G13
1069-7 G11
Transient Response
100
1069-7 G14
Output Voltage Swing
vs Temperature
Output Offset vs Clock Frequency
–10
4.3
4.2
–20
VOLTAGE SWING (V)
OUTPUT OFFSET (mV)
–15
1V/DIV
PHASE DIFFERENCE (DEG)
2.25
0.75
THD + Noise vs Frequency
THD + Noise vs Input (VP-P)
–40
2.50
13.0
GAIN
–2
–5
0
13.5
VS = ±5V
fCLK = 2.5MHz
fC = 100kHz
DELAY (μs)
–2
2
PHASE (DEG)
GAIN (dB)
–1
180
GAIN (dB)
2
VS = 5V
–25
–30
–35
VS = ±5V
–40
VS = 5V (AGND AT 2.5V)
fCLK = 500kHz
fCUTOFF = 20kHz
RL = 10k
ISOURCE/ISINK ≤ 1mA
4.1
1.2
1.1
VS = ±5V
0.1ms/DIV
fCLK = 500kHz
fCUTOFF = 20kHz
VIN = 4VP-P SQUARE WAVE AT 1kHZ
1069-7 G15
–45
–50
0.25
1.25
3.25
4.25
2.25
CLOCK FREQUENCY (MHz)
5.25
1.0
–40
1069-7 G16
www.BDTIC.com/Linear
–20
40
20
0
60
TEMPERATURE (°C)
80
100
1069-7 G17
10697fa
5
LTC1069-7
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage Swing
vs Temperature
Supply Current
vs Supply Voltage
Supply Current
vs Clock Frequency
4.2
22
fCLK = 10Hz
4.0
–4.5
VS = ±5V
fCLK = 2.5MHz
fCUTOFF = 100kHz
RL = 10k
ISOURCE/ISINK = 1mA
SUPPLY CURRENT (mA)
VOLTAGE SWING (V)
4.1
21
25°C
20
85°C
SUPPLY CURRENT (mA)
25
20
–40°C
15
10
–4.6
5
–4.7
–40 –20
0
19
VS = ±5V
18
17
16
15
14
13
12
VS = 5V
11
40
20
0
60
TEMPERATURE (°C)
80
100
0
1
2
3
4
SUPPLY VOLTAGE (±V)
5
1069-7 G18
10
0.25
6
1.25
2.25
3.25
4.25
CLOCK FREQUENCY (MHz)
1069-7 G19
5.25
1069-7 G20
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 capacitor 0.47μF or
larger. An internal resistive divider biases Pin 1 to half 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 Supplies. The V+ (Pin 2) and
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 in any order, that is, the
positive supply can be applied before the negative supply
and vice versa. Figure 2 shows the connections for dual
supply operation.
6
NC (Pins 3, 6): No Connection. Pins 3 and 6 are not
connected to any internal circuitry; they should be tied
to ground.
VIN (Pin 4): Filter Input. The filter input pin is internally
connected to the inverting inputs of two op amps through
a 36k resistor for each op amp. This parallel combination
creates an 18k input impedance.
ANALOG GROUND
PLANE
1
0.47μF
V+
0.1μF
2
3
4
VIN
STAR
SYSTEM
GROUND
AGND
V+
VOUT
LTC1069-7
V–
NC
NC
VIN
CLK
DIGITAL
GROUND
PLANE
8
VOUT
7
6
5
1k
CLOCK
SOURCE
1069-7 F01
Figure 1. Connections for Single Supply Operation
www.BDTIC.com/Linear
10697fa
LTC1069-7
PIN FUNCTIONS
ANALOG GROUND
PLANE
1
2
V+
0.1μF
AGND
V+
VOUT
V–
8
LTC1069-7
6
NC
NC
4
5
VIN
CLK
VIN
3
STAR
SYSTEM
GROUND
VOUT
7
DIGITAL
GROUND
PLANE
V–
0.1μF
1k
CLOCK
SOURCE
1069 F02
Figure 2. Connections for Dual Supply Operation
CLK (Pin 5): Clock Input. 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 only
be connected to the clock’s ground at a single point. Table
1 shows the clock’s low and high level threshold value for
a dual or 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 sources because
excessive slow clock rise or fall times generate internal
clock jitter. The maximum clock rise or fall time 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.
Table 1. Clock Source High and Low Thresholds
POWER SUPPLY
HIGH LEVEL
LOW LEVEL
1.5V
0.5V
Single Supply = 10V
6.5V
5.5V
Single Supply = 5V
1.5V
0.5V
Dual Supply = ± 5V
VOUT (Pin 8): Filter Output. Pin 8 is the output of the filter,
and it can source 23mA or sink 16mA. The total harmonic
distortion of the filter will degrade when driving coaxial
cables or loads less than 20k without an output buffer.
APPLICATIONS INFORMATION
Temperature Behavior
Table 2. Clock Feedthrough
The power supply current of the LTC1069-7 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.
Clock Feedthrough
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.
VS
CLOCK FEEDTHROUGH
5V
400μVRMS
±5V
850μVRMS
Any parasitic switching transients during the rising and
falling 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 by
adding a single RC lowpass filter at the output (Pin 8) of
the LTC1069-7.
www.BDTIC.com/Linear
10697fa
7
LTC1069-7
APPLICATIONS INFORMATION
Wideband Noise
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
specifications are not part of the wideband noise.
Table 3. Wideband Noise
VS
CLOCK FEEDTHROUGH
4.75V
125μVRMS
±5V
140μVRMS
Aliasing
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 LTC1069-7 is 50 times its fCUTOFF frequency. For
instance if a 48kHz, 100mVRMS signal is applied at the
8
input of an LTC1069-7 operating with a 50% duty cycle
25kHz clock, a 2kHz, 741μVRMS alias signal will appear
at the filter output. Table 4 shows details.
Table 4. Aliasing
INPUT FREQUENCY
VIN = 1VRMS
OUTPUT LEVEL
Relative to Input
OUTPUT FREQUENCY
Aliased Frequency
fCLK /fC = 25:1, fCUTOFF = 1kHz
40kHz (or 60kHz)
–59.9dB
10kHz
47kHz (or 53kHz)
–54.2dB
3kHz
48kHz (or 52kHz)
–42.6dB
2kHz
48.5kHz (or 51.5kHz)
–18.3dB
1.5kHz
49kHz (or 52kHz)
–2.9dB
1.0kHz
49.5kHz (or 50.5kHz)
–0.65dB
0.5kHz
Speed Limitations
To avoid op amp slew rate limiting, the signal amplitude
should be kept below a specified level as shown in Table 5.
Table 5. Maximum VIN vs VS and Clock
VS
MAXIMUM CLOCK
MAXIMUM VIN
5V
≥ 2.5MHz
340mVRMS (fIN ≥ 200kHz)
±5V
≥ 4.5MHz
1.2VRMS (fIN ≥ 400kHz)
www.BDTIC.com/Linear
10697fa
LTC1069-7
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(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
s 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
www.BDTIC.com/Linear
SO8 0303
10697fa
9
LTC1069-7
TYPICAL APPLICATION
Clock Tunable, Noninverting, Linear Phase 8th Order Filter to 200kHz fCUTOFF
51pF
10k
5V
1μF
AGND
VOUT
0.1μF
10k
–
–5V
5V
V+
0.1μF
LT®1354
V–
0.1μF
LTC1069-7
NC
VOUT
+
NC
0.1μF
–5V
VIN
VIN
CLK
fCLK ≤ 5MHz
1069-7 TA03
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1064-3
Linear Phase, Bessel 8th Order Filter
fCLK/fC = 75/1 or 150/1, Very Low Noise
LTC1064-7
Linear Phase, 8th Order Lowpass Filter
fCLK/fC = 50/1 or 100/1, fC(MAX) = 100kHz
LTC1164-7
Low Power, Linear Phase Lowpass Filter fCLK/fC = 50/1 or 100/1, IS = 2.5mA, VS = 5V
LTC1264-7
Linear Phase 8th Order Lowpass Filter
fCLK/fC = 25/1 or 50/1, fC(MAX) = 200kHz
Corporation
www.BDTIC.com/Linear
10 Linear Technology
10697fa
LTC 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 2008