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LTC1069-7 Linear Phase 8th Order Lowpass Filter
FEATURES
s s s s s
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8th Order, Linear Phase Filter in SO-8 Package Raised Cosine Amplitude Response - 43dB Attenuation at 2x fCUTOFF Wideband Noise: 140VRMS Operates from Single 5V Supply to 5V Power Supplies Clock-Tunable to 200kHz with 5V Supplies Clock-Tunable to 120kHz with Single 5V Supply
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 LTC10697 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 140VRMS. Unlike other LTC1069-X filters, the typical passband gain of the LTC1069-7 is equal to -1V/V. 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIONS
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Digital Communication Filter Antialiasing Filter with Linear Phase Smoothing Filters
DESCRIPTION
The LTC (R)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
TYPICAL APPLICATION
Frequency Response
10
Single 5V Supply, Linear Phase 100kHz Lowpass Filter
AGND 5V 0.47F 0.1F NC VIN VIN V+ LTC1069-7 NC CLK fCLK = 2.5MHz
1069-7 TA01
VOUT V-
GAIN (dB)
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0 -10 -20 - 30 - 40 - 50 - 60 -70 10 100 FREQUENCY (kHz) 1000
1069-7 TA02
VOUT
1
LTC1069-7
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V -) ............................. 12V Power Dissipation............................................. 400mW Operating Temperature Range LTC1069-7C ........................................... 0C to 70C LTC1069-7I ....................................... - 40C to 85C Storage Temperature ............................ - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
TOP VIEW AGND 1 V+ 2 NC 3 VIN 4 8 7 6 5 VOUT V- NC CLK
ORDER PART NUMBER LTC1069-7CS8 LTC1069-7IS8 S8 PART MARKING 10697 10697I
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125C, JA = 110C/ W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
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 1s), RL = 10k, TA = 25C, unless otherwise specified. All AC gains are measured relative to the passband gain.
PARAMETER Passband Gain (fIN 0.2fCUTOFF) CONDITIONS VS = 5V, fCLK = 2.5MHz fTEST = 1kHz, VIN = 1VRMS VS = 4.75V, fCLK = 500kHz fTEST = 1kHz, VIN = 0.5VRMS Gain at 0.25fCUTOFF VS = 5V, fCLK = 2.5MHz fTEST = 25kHz, VIN = 1VRMS VS = 4.75V, fCLK = 500kHz fTEST = 5kHz, VIN = 0.5VRMS Gain at 0.50fCUTOFF VS = 5V, fCLK = 2.5MHz fTEST = 50kHz, VIN = 1VRMS VS = 4.75V, fCLK = 500kHz fTEST = 10kHz, VIN = 0.5VRMS Gain at 0.75fCUTOFF VS = 5V, fCLK = 2.5MHz fTEST = 75kHz, VIN = 1VRMS VS = 4.75V, fCLK = 500kHz fTEST = 15kHz, VIN = 0.5VRMS Gain at fCUTOFF VS = 5V, fCLK = 2.5MHz fTEST = 100kHz, VIN = 1VRMS VS = 4.75V, fCLK = 500kHz fTEST = 20kHz, VIN = 0.5VRMS Gain at 1.5fCUTOFF VS = 5V, fCLK = 2.5MHz fTEST = 150kHz, VIN = 1VRMS VS = 4.75V, fCLK = 500kHz fTEST = 30kHz, VIN = 0.5VRMS Gain at 2.0fCUTOFF VS = 5V, fCLK = 2.5MHz fTEST = 200kHz, VIN = 1VRMS VS = 4.75V, fCLK = 500kHz fTEST = 40kHz, VIN = 0.5VRMS
q
MIN
TYP - 0.10 - 0.10
MAX 0.75 0.90 0.75 0.90 - 0.1
UNITS dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB
q
- 0.30
q q q q q q q q q q q q
- 0.55 - 0.05 - 0.30 - 1.0 - 1.40 - 0.30 - 0.60 - 1.65 - 2.1 - 0.75 - 1.15 - 3.5 - 4.0 - 2.9 - 3.3 - 16.5 - 19 - 18.1 - 20 - 43 - 55 - 41 - 48
0.15 - 0.35 0 - 0.80 - 0.25 - 2.7 - 2.4 - 14 - 17 - 38 - 39
2
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U
WW
W
LTC1069-7
ELECTRICAL CHARACTERISTICS
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 1s), RL = 10k, TA = 25C, unless otherwise specified. All AC gains are measured relative to the passband gain.
PARAMETER Gain at 5.0fCUTOFF Gain at fCUTOFF (160kHz) Phase at 0.5fCUTOFF Phase at fCUTOFF Passband Phase Deviation from Linear Phase (Note 1) Output DC Offset (Input at GND) Output Voltage Swing Power Supply Current CONDITIONS VS = 4.75V, fCLK = 500kHz fTEST = 100kHz, VIN = 0.5VRMS VS = 5V, fCLK = 4MHz fTEST = 160kHz, VIN = 1VRMS VS = 5V, fCLK = 2.5MHz fTEST = 50kHz VS = 5V, fCLK = 2.5MHz fTEST = 100kHz VS = 5V, fCLK = 500kHz VS = 5V, fCLK = 500kHz VS = 4.75V, fCLK = 400kHz VS = 5V, ISOURCE/ISINK 1mA, RL = 10k VS = 4.75V, ISOURCE/ISINK 1mA, RL = 10k VS = 5V, fCLK = 500kHz
q q q
MIN - 70
TYP -59 - 2.1
MAX - 55
UNITS dB dB
- 35 - 240
- 30.5 - 235 - 3.0 50 25
- 25 - 230
Deg Deg Deg mV mV V VP-P
125
3.5 2.6
4.0 3.6 18 13 26 29 15 16.5
mA mA mA mA
VS = 4.75V, fCLK = 400kHz
q
The q denotes specifications which apply over the full operating temperature range. Note 1: Phase Deviation = 1/2(Phase at 0Hz - Phase at fCUTOFF) - (Phase at 0Hz - Phase at 0.5fCUTOFF) Phase at 0Hz = 180 (guaranteed by design)
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
TYPICAL PERFORMANCE CHARACTERISTICS
Passband Gain vs Frequency
1.0 0.5 0 -0.5 10 VS = 5V fCLK = 500kHz fC = 20kHz VIN = 2VRMS 0 -10
GAIN (dB)
GAIN (dB)
-1.5 -2.0 -2.5 -3.0 -3.5 -4.0
-20 -30 -40 -50
GAIN (dB)
-1.0
1
3
5
7 9 11 13 15 17 19 21 FREQUENCY (kHz)
LTC1069-7 * TPC01
UW
Transition Band Gain vs Frequency
VS = 5V fCLK = 500kHz fC = 20kHz VIN = 2VRMS
-40 -42 -44 -46 -48 -50 -52 -54 -56 -58
Stopband Gain vs Frequency
VS = 5V fCLK = 500kHz fC = 20kHz VIN = 2VRMS
21 23 25 27 29 31 33 35 37 39 41 FREQUENCY (kHz)
LTC1069-7 * TPC02
-60
41 45 49 53 57 61 65 69 73 77 81 FREQUENCY (kHz)
LTC1069-7 * TPC03
3
LTC1069-7 TYPICAL PERFORMANCE CHARACTERISTICS
Gain vs Frequency
10 0 -10
GAIN (dB)
VS = 5V fCLK = 250kHz fC = 10kHz VIN = 1VRMS
GAIN (dB)
-20 -30 -40 -50 -60 1 10 FREQUENCY (kHz) 100
LTC1069-7 * TPC04
-6 -9 -12 -15 -18 20
fCLK = 2.5MHz fCLK = 4.5MHz fCLK = 4MHz fCLK = 3.5MHz fCLK = 3MHz VS = 5V VIN = 2VRMS 40 60 80 100 120 140 160 180 200 FREQUENCY (kHz)
LTC1069-7 * TPC05
GAIN (dB)
Gain vs Supply Voltage
10 0 -10 fCLK = 2MHz fC = 80kHz VIN = 0.5VRMS
GAIN (dB)
GAIN (dB)
-20 -30 -40 -50 -60 10 30 50 70 90 110 130 150 170 190 210 FREQUENCY (kHz)
LTC1069-7 * TPC07
-6 -9 -12 -15 -18 20 fCLK = 2.5MHz fCLK = 2MHz fCLK = 1.5MHz 40 60 80 100 120 140 160 180 200 FREQUENCY (kHz)
LTC1069-7 * TPC08
GAIN (dB)
VS = 5V
Passband Gain and Phase vs Frequency
2 1 0 -1
GAIN (dB)
GAIN
GAIN (dB)
-2 -3 -4 -5 -6 -7 -8 0 PHASE
-270 10 20 30 40 50 60 70 80 90 100 FREQUENCY (kHz)
LTC1069-7 * TPC10
4
UW
VS = 5V
Passband Gain vs Clock Frequency
3 0 -3 fCLK = 5MHz
Passband Gain vs Frequency
1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 10 40 100 70 FREQUENCY (kHz) 130 160 TA = -40C TA = 25C TA = 85C VS = 5V fCLK = 4MHz fC = 160kHz VIN = 2VRMS
LTC1069-7 * TPC06
Passband Gain vs Clock Frequency
3 0 -3 fCLK = 3MHz VS = 5V VIN = 1VRMS
1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0
Passband Gain vs Frequency
TA = 85C
TA = -40C TA = 25C VS = 5V fCLK = 2.5MHz fC = 100kHz VIN = 1VRMS 10 20 30 40 50 60 70 FREQUENCY (kHz) 80 90 100
LTC1069-7 * TPC09
Passband Gain and Delay vs Frequency
180 135 90 45
PHASE (DEG)
2 1 0 -1 GAIN -2 -3 -4 -5 -6 -7 -8 0 DELAY
VS = 5V fCLK = 2.5MHz fC = 100kHz
VS = 5V fCLK = 2.5MHz fC = 100kHz
13.5
13.0
DELAY (s)
0 -45 -90 -135 -180 -225
12.5
12.0
11.5
11.0 10 20 30 40 50 60 70 80 90 100 FREQUENCY (kHz)
LTC1069-7 * TPC12
LTC1069-7 TYPICAL PERFORMANCE CHARACTERISTICS
Phase Matching vs Frequency
2.50 2.25
PHASE DIFFERENCE (DEG)
70C
2.00
THD + NOISE (dB)
25C
THD + NOISE (dB)
1.75 1.50 1.25 1.00 0.75 0.50 0.25 0
VS = 5V fCLK 2.5MHz PHASE DIFFERENCE BETWEEN ANY TWO UNITS (SAMPLE OF 20 REPRESENTATIVE UNITS) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 FREQUENCY (fCUTOFF/FREQUENCY)
LTC1069-7 * TPC11
Transient Response
-10 -15
OUTPUT OFFSET (mV)
1V/DIV
VS = 5V -25 -30 -35 -40 -45 -50 0.25 VS = 5V
VOLTAGE SWING (V)
VS = 5V 0.1ms/DIV fCLK = 500kHz fCUTOFF = 20kHz VIN = 4VP-P SQUARE WAVE AT 1kHz
Output Voltage Swing vs Temperature
4.2
4.1
SUPPLY CURRENT (mA)
VOLTAGE SWING (V)
20 15 10 5 0 -40C
SUPPLY CURRENT (mA)
4.0
-4.5
VS = 5V fCLK = 2.5MHz fCUTOFF = 100kHz RL = 10k ISOURCE/ISINK = 1mA
-4.6
-4.7 -40 -20
40 20 0 60 TEMPERATURE (C)
UW
80
LTC1069-7 * TPC18
THD + Noise vs Input (VP-P)
-40 -45 -50 -55 -60 -65 -70 -75 0.1 1 INPUT (VP-P) 10
LTC1609-7 * TPC13
THD + Noise vs Frequency
-40 -45 -50 -55 -60 -65 -70 VS = 5V, VIN = 1VP-P fCLK = 2.5MHz fC = 100kHz
fCLK = 1MHz fC = 40kHz fIN = 1kHz
VS = 5V
VS = 5V
-75 -80 1
VS = 5V, VIN = 2VP-P 10 FREQUENCY (kHz) 100
LTC1069-7 * TPC14
Output Offset vs Clock Frequency
4.3
Output Voltage Swing vs Temperature
-20
4.2 VS = 5V (AGND AT 2.5V) fCLK = 500kHz fCUTOFF = 20kHz RL = 10k ISOURCE/ISINK 1mA
4.1
1.2
LTC1069-7 * TPC15
1.1
1.25 3.25 4.25 2.25 CLOCK FREQUENCY (MHz)
5.25
1.0 -40 -20
40 20 0 60 TEMPERATURE (C)
80
100
LTC1069-7 * TPC16
LTC1069-7 * TPC17
Supply Current vs Supply Voltage
22
Supply Current vs Clock Frequency
21
25
fCLK = 10Hz 25C 85C
20 19 18 17 16 15 14 13 12 11 VS = 5V 1.25 2.25 3.25 4.25 CLOCK FREQUENCY (MHz) 5.25 10 0.25 VS = 5V
100
0
1
4 2 3 SUPPLY VOLTAGE (V)
5
6
LTC1069-7 * TPC19
LTC1263 * TPC20
5
LTC1069-7
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 0.47F 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 0.1F 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-tonoise 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. 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. 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 0.42s (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 1s. 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 Dual Supply = 5V Single Supply = 10V Single Supply = 5V HIGH LEVEL 1.5V 6.5V 1.5V LOW LEVEL 0.5V 5.5V 0.5V
ANALOG GROUND PLANE 1 0.47F 0.1F V+ 2 3 4 VIN AGND V+ NC VIN VOUT V- NC CLK 8 7 6 5 VOUT
STAR SYSTEM GROUND
Figure 1. Connections for Single Supply Operation
6
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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.
ANALOG GROUND PLANE 1 V+ 0.1F 2 AGND V+ VOUT V- 8 7 0.1F VOUT V-
LTC1069-7
LTC1069-7 3 6 NC NC 4 5 VIN CLK VIN
DIGITAL GROUND PLANE
1k CLOCK SOURCE
LTC1069-7 * F01
STAR SYSTEM GROUND
DIGITAL GROUND PLANE
1k CLOCK SOURCE
LTC1069 F02
Figure 2. Connections for Dual Supply Operation
LTC1069-7
APPLICATIONS INFORMATION
Temperature Behavior 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.
Table 2. Clock Feedthrough
VS 5V 5V CLOCK FEEDTHROUGH 400VRMS 850VRMS
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. 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
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.
U
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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 4.75V 5V WIDEBAND NOISE 125VRMS 140VRMS
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 input of an LTC1069-7 operating with a 50% duty cycle 25kHz clock, a 2kHz, 741VRMS alias signal will appear at the filter output. Table 4 shows details.
Table 4. Aliasing
INPUT FREQUENCY VIN = 1VRMS 40kHz (or 60kHz) 47kHz (or 53kHz) 48kHz (or 52kHz) 48.5kHz (or 51.5kHz) 49kHz (or 52kHz) 49.5kHz (or 50.5kHz) OUTPUT LEVEL Relative to Input -59.9dB -54.2dB -42.6dB -18.3dB -2.9dB -0.65dB OUTPUT FREQUENCY Aliased Frequency 10kHz 3kHz 2kHz 1.5kHz 1.0kHz 0.5kHz
fCLK /fC = 25:1, fCUTOFF = 1kHz
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 5V 5V MAXIMUM CLOCK 2.5MHz 4.5MHz MAXIMUM VIN 340mVRMS (fIN 200kHz) 1.2VRMS (fIN 400kHz)
7
LTC1069-7
TYPICAL APPLICATION
Clock Tunable, Noninverting, Linear Phase 8th Order Filter to 200kHz fCUTOFF
51pF
0.1F NC VIN VIN
PACKAGE DESCRIPTION
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254)
0.053 - 0.069 (1.346 - 1.752) 0- 8 TYP
0.016 - 0.050 0.406 - 1.270
0.014 - 0.019 (0.355 - 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
RELATED PARTS
PART NUMBER LTC1064-3 LTC1064-7 LTC1164-7 LTC1264-7 DESCRIPTION Linear Phase, Bessel 8th Order Filter Linear Phase, 8th Order Lowpass Filter Low Power, Linear Phase Lowpass Filter Linear Phase 8th Order Lowpass Filter COMMENTS fCLK/fC = 75/1 or 150/1, Very Low Noise fCLK/fC = 50/1 or 100/1, fC(MAX) = 100kHz fCLK/fC = 50/1 or 100/1, IS = 2.5mA, VS = 5V fCLK/fC = 25/1 or 50/1, fC(MAX) = 200kHz
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 q (408) 432-1900 FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
U
U
5V
10k 5V 1F AGND V+ LTC1069-7 NC -5V CLK fCLK 5MHz
1069-7 TA03
0.1F 10k
VOUT -5V V- 0.1F
-
LT (R)1354 VOUT
+
0.1F
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 8 7 6 5
0.004 - 0.010 0.228 - 0.244 (0.101 - 0.254) (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
0.050 (1.270) TYP
1
2
3
4
SO8 0996
10697f LT/TP 0697 7K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1996

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