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LTC1064-2 Low Noise, High Frequency, 8th Order Butterworth Lowpass Filter
FEATURES

DESCRIPTIO
8th Order Filter in a 14-Pin Package 140kHz Maximum Corner Frequency No External Components 50:1 and 100:1 Clock to Cutoff Frequency Ratio 80VRMS Total Wideband Noise 0.03% THD or Better Operates from 2.37V to 8V Power Supplies
The LTC(R)1064-2 is a monolithic 8th order lowpass Butterworth filter, which provides a maximally flat passband. The attenuation slope is -48dB/octave and the maximum attenuation is in excess of 80db. An external TTL or CMOS clock programs the filter's cutoff frequency. The clock to cutoff frequency ratio is 100:1 (Pin 10 at V -) or 50:1 (Pin 10 at V +). The maximum cutoff frequency is 140kHz. No external components are needed. The LTC1064-2 features low wideband noise and low harmonic distortion even for input voltages up to 3VRMS. In fact the LTC1064-2 overall performance competes with equivalent multiple op amp RC active realizations. The LTC1064-2 is available in a 14-pin DIP or 16-pin surface mounted SW package. The LTC1064-2 is fabricated using LTC's enhanced analog CMOS Si-gate process. The LTC1064-2 is pin compatible with the LTC1064-1.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S

Antialiasing Filters Smoothing Filters Tracking High Frequency Lowpass Filters
TYPICAL APPLICATIO
8th Order Clock Sweepable Lowpass Butterworth Filter
1 14 OUT C LTC1064-2 2 13 NC VIN NC 3 8V 4 5 6 7
VOUT/VIN (dB)
Measured Frequency Response
0 VS = 7.5V -15 -30
AGND V+ AGND NC RIN A
V- fCLK 50/100 VOUT NC
12 11 10 9 8
-8V CLOCK = 5MHz
-45 -60 -75 -90
-105
1064 TA01a
0
100
NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1F CAPACITOR CLOSE TO THE PACKAGE. THE NC PINS 1, 6, 8, AND 13 SHOULD BE PREFERABLY GROUNDED.
U
200 300 400 500 FREQUENCY (kHz) 600 700
1064-2 TA01b
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U
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LTC1064-2
ABSOLUTE
AXI U RATI GS
Total Supply Voltage (V + to V -) ............................ 16.5V Power Dissipation .............................................. 400mW Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER I FOR ATIO
TOP VIEW NC VIN AGND V+ AGND NC RIN A 1 2 3 4 5 6 7 14 OUT C 13 NC 12 V - 11 fCLK 10 50/100 9 8 VOUT NC
ORDER PART NUMBER
NC 1 2 3 4 5 6 7 8
LTC1064-2CN
N PACKAGE 14-LEAD PDIP TJMAX = 150C, JA = 110C/W J PACKAGE 14-LEAD CERDIP
OBSOLETE PACKAGE
Consider the N14 Package for Alternate Source
LTC1064-2MJ LTC1064-2CJ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER Passband Gain (Note 2) Gain TempCo -3dB Frequency Gain at -3dB Frequency Stopband Attenuation Stopband Attenuation Stopband Attenuation Stopband Attenuation Input Frequency Range Output Voltage Swing and Operating Input Voltage Range Total Harmonic Distortion Wideband Noise CONDITIONS
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 7.5V, 100:1, fCLK = 2MHz, R1 = 10k, TTL clock input level unless otherwise specified.
MIN
Referenced to 0dB, 1Hz to 1kHz 100:1 50:1 Referenced to 0dB, fIN = 20kHz At 1.5f -3dB , 50:1, fIN = 60kHz At 2f -3dB , 100:1, fIN = 40kHz At 3f -3dB , 100:1, fIN = 60kHz At 4f -3dB , 100:1, fIN = 80kHz 100:1 50:1 VS = 2.37V VS = 5V VS = 7.5V VS = 5V, Input = 1VRMS at 1kHz VS = 7.5V, Input = 3VRMS at 1kHz VS = 5V, Input = GND 1Hz - 1.99MHz VS = 7.5V, Input = GND 1Hz - 1.99MHz
2
U
U
W
WW U
W
(Note 1)
Operating Temperature Range LTC1064-2M (OBSOLETE) ............... - 55C to 125C LTC1064-2C ....................................... - 40C to 85C
TOP VIEW 16 OUT C 15 NC 14 V-
ORDER PART NUMBER LTC1064-2CSW
VIN AGND V+ AGND NC NC RIN A
13 NC 12 fCLK 11 50/100 10 NC 9 VOUT
SW PACKAGE 16-LEAD PLASTIC (WIDE) SO TJMAX = 150C, JA = 130C/W
TYP 0.0002 20 40 -3 -27 -47 -74 -90
MAX 0.15
UNITS dB dB/C kHz kHz dB dB dB dB dB kHz kHz V V V
-0.5

-2.75
-24 -44
0 0

1.1 3.1 5.0 0.015 0.03 80 90
% % VRMS VRMS
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LTC1064-2
ELECTRICAL CHARACTERISTICS
PARAMETER Output DC Offset (Note 2) Output DC Offset TempCo Input Impedance Output Impedance Output Short-Circuit Current Clock Feedthrough Maximum Clock Frequency Power Supply Current 50% Duty Cycle, VS = 5V 50% Duty Cycle, TA = 25C, VS = 7.5V VS = 2.37V, f CLK = 1MHz VS = 5V, f CLK = 1MHz VS = 7.5V, f CLK = 1MHz

The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 7.5V, 100:1, fCLK = 2MHz, R1 = 10k, TTL clock input level unless otherwise specified.
CONDITIONS VS = 7.5V VS = 5V 10 f OUT = 10kHz Source/Sink MIN TYP 30 90 20 2 3/1 200 5 7 11 14 17
MAX 125
UNITS mV V/C k mA VRMS MHz MHz mA mA mA mA mA V
22 23 26 28 32 8
Power Supply Voltage Range Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
2.37
Note 2: For tighter specifications please contact LTC Marketing.
TYPICAL PERFOR A CE CHARACTERISTICS
Amplitude Response
15 0 -15 fCLK = 2MHz f-3dB = 40kHz fCLK = 7MHz f-3dB = 140kHz
45 0 -45 -90 -135 -180 -225 -270 -315 -360 VS = 7.5V TA = 25C f CLK = 1MHz 100:1 f-3dB = 10kHz
PHASE (DEG)
-30 -45 -60 -75 -90 VS = 7.5V; 50:1 TA = 25C 100k fIN (Hz) 1M
1064 G01
GROUP DELAY (s)
VOUT/VIN (dB)
fCLK = 5MHz f-3dB = 100kHz
-105 10k
UW
Phase Response
220
Group Delay vs Frequency
VS = 7.5V 200 T = 25C A 180 f CLK = 1MHz 100:1 160 f -3dB = 10kHz 140 120 100 80 60 40 20 0
-405 -450 0 1 2 3 4 67 fIN (kHz) 5 8 9 10 11
1064 G02
0
1
2
3
4
567 fIN (kHz)
8
9 10 11
1064 G03
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LTC1064-2 TYPICAL PERFOR A CE CHARACTERISTICS
Phase vs f -3dB Frequency
30 0 -30 -60 fCLK = 500kHz f-3dB = 10kHz fCLK = 1MHz f-3dB = 20kHz fCLK = 2MHz f-3dB = 40kHz
PHASE (DEG)
1.6 1.2 0.8 0.4 0
-90 -120 -150 -180 -210 -240 VS = 7.5V 50:1 -270 100
OUTPUT NOISE (nV/Hz)
PHASE MATCH (DEG)
1k FREQUENCY (Hz)
Harmonic Distortion vs Frequency
0.1 fCLK = 1MHz, f-3dB = 20kHz, 50:1 5V, 1VRMS INPUT
HARMONIC DISTORTION (%)
HARMONIC DISTORTION (%)
7.5V, 3VRMS INPUT 0.01
0.001 1k FREQUENCY (Hz)
Power Suppy vs Current
48 44
POWER SUPPLY CURRENT (mA)
40 36 32 28 24 20 16 12 8 4 0 02 4 6 8 10 12 14 16 18 20 22 24 POWER SUPPLY VOLTAGE (V)
1064 G09
VOUT/VIN (dB)
4
UW
1064 G04
Phase Matching
2.4 2.0 VS = 7.5V, fCLK = 1MHz, f-3dB = 20kHz, 50:1 50 UNIT SAMPLE (TA = 25C TO 125C) 1600 1400 1200 (1060) 1000 800
Noise Spectral Density
fCLK = 500kHz 100:1, f-3dB = 5kHz
fCLK = 2MHz 600 100:1, f-3dB = 20kHz (530) 400 (335) fCLK = 5MHz 200 100:1, f-3dB = 50kHz 0 0.1k 1k 10k FREQUENCY (Hz) 100k
1064-2 G06
10k
0
4
8 12 16 FREQUENCY (kHz)
20
24
1064-2 G05
Harmonic Distortion vs Amplitude
1 2.5V 5V 0.1 7V
0.01
fCLK = 1MHz, f-3dB = 20kHz 50:1, 1kHz INPUT
10k
20k
1064-2 G07
0.001 0.5
1.0 AMPLITUDE (VRMS)
5.0
1064-2 G08
Amplitude Response with Pin 10 at Ground
15 0 -15 -30 -45 -60 -75 -90 -105 1 10 fIN (kHz) 100
1064-2 G10
PIN 10 AT GROUND fCLK =1MHz
TA = -55C TA = 25C TA = 125C
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LTC1064-2 TYPICAL PERFOR A CE CHARACTERISTICS
Table 1. Gain/Delay, f -3dB = 1kHz, LTC1064-2 Typical Response VS = 5V, TA = 25C, fCLK = 50kHz, Ratio = Pin 10 at V + (fltr 50:1)
FREQUENCY (kHz) 0.200 0.300 0.400 0.500 0.600 0.700 0.800 0.900 1.000 1.100 1.200 GAIN (dB) -0.247 -0.270 -0.290 -0.300 -0.320 -0.370 -0.520 -1.200 -3.380 -7.530 -12.670 DELAY (ms) 0.857 0.872 0.893 0.929 0.983 1.071 1.210 1.364 1.381 1.192 0.935
Table 2. Gain, f -3dB = 1kHz, LTC1064-2 Typical Response VS = 5V, TA = 25C, fCLK = 50kHz, Ratio = Pin 10 at V + (fltr 50:1)
FREQUENCY (kHz) 0.500 1.000 1.500 2.000 2.500 3.000 3.500 4.000 4.500 5.000 5.500 6.000 6.500 7.000 7.500 8.000 8.500 9.000 9.500 GAIN (dB) -0.298 -3.380 -27.500 -47.200 -63.300 -75.190 -86.100 -95.310 -104.240 -109.650 -121.930 -123.920 -114.150 -116.990 -120.070 -113.470 -130.090 -114.770 -117.760
UW
Table 3. Gain/Delay, f -3dB = 1kHz, LTC1064-2 Typical Response VS = 5V, TA = 25C, fCLK = 100kHz, Ratio = Pin 10 at V - (fltr 100:1)
FREQUENCY (kHz) 0.200 0.300 0.400 0.500 0.600 0.700 0.800 0.900 1.000 1.100 1.200 GAIN (dB) -0.213 -0.240 -0.260 -0.280 -0.310 -0.370 -0.530 -1.200 -3.370 -7.500 -12.640 DELAY (ms) 0.821 0.837 0.858 0.893 0.947 1.034 1.172 1.325 1.346 1.158 0.899
Table 4. Gain, f-3dB = 1kHz, LTC1064-2 Typical Response VS = 5V, TA = 25C, fCLK = 100kHz, Ratio = Pin 10 at V - (fltr 100:1)
FREQUENCY (kHz) 0.500 1.000 1.500 2.000 2.500 3.000 3.500 4.000 4.500 5.000 5.500 6.000 6.500 7.000 7.500 8.000 8.500 9.000 9.500 GAIN (dB) -0.279 -3.370 -27.500 -47.200 -62.300 -75.130 -86.090 -95.210 -103.030 -108.690 -114.830 -120.540 -114.750 -116.430 -120.790 -121.290 -119.970 -120.020 -125.170
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LTC1064-2 TYPICAL PERFOR A CE CHARACTERISTICS
Table 5. Gain, f -3dB = 20kHz, LTC1064-2 Typical Response VS = 7.5V, TA = 25C, fCLK = 1MHz, Ratio = Pin 10 at V + (fltr 50:1)
FREQUENCY (kHz) 10.000 20.000 30.000 40.000 50.000 60.000 70.000 80.000 90.000 100.000 110.000 120.000 130.000 140.000 150.000 GAIN (dB) -0.308 -3.350 -27.400 -47.100 -62.300 -74.890 -85.430 -95.070 -103.150 -108.700 -107.520 -108.030 -104.990 -106.090 -105.320
Table 7. Gain Non-Butterworth Response (Pin 10 to GND), LTC1064-2 Typical Response VS = 5V, TA = 25C, fCLK = 100kHz
FREQUENCY (kHz) 0.500 1.000 1.500 2.000 2.500 3.000 3.500 4.000 4.500 5.000 5.500 6.000 6.500 7.000 7.500 8.000 8.500 9.000 9.500 GAIN (dB) -0.012 1.240 -14.690 -28.600 -41.100 -52.500 -62.800 -71.500 -79.370 -86.730 -93.340 -99.350 -105.270 -113.270 -114.600 -114.010 -122.810 -122.980 -119.450
6
UW
Table 6. Gain, f-3dB = 140kHz, LTC1064-2 Typical Response VS = 7.5V, TA = 25C, fCLK = 7MHz, Ratio = Pin 10 at V+ (fltr 50:1)
FREQUENCY (kHz) 50.00 60.00 70.00 80.00 90.00 100.00 110.00 120.00 130.00 140.00 150.00 160.00 170.00 180.00 190.00 200.00 210.00 220.00 230.00 240.00 250.00 260.00 270.00 280.00 290.00 300.00 GAIN (dB) -0.238 -0.140 0.050 0.350 0.810 1.450 2.110 1.830 -0.700 -4.840 -9.350 -13.690 -17.760 -21.600 -25.200 -28.500 -31.800 -34.800 -37.700 -40.500 -43.200 -45.700 -48.200 -50.500 -52.700 -54.900
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LTC1064-2
PI FU CTIO S
NC (Pins 1, 6, 8 and 13): The "no connection" pins should be preferably grounded. These pins are not internally connected. VIN, VOUT (Pins 2, 9): The input Pin 2 is connected to an 18k resistor tied to the inverting input of an op amp. Pin 2 is protected against static discharge. The device's output, Pin 9, is the output of an op amp which can typically source/sink 3mA/1mA. Although the internal op amps are unity gain stable, driving long coax cables is not recommended. When testing the device for noise and distortion, the output, Pin 9, should be buffered. (Figure 1) The op amp power supply wire (or trace) should be connected directly to the power source. To eliminate switching transients from filter output, buffer filter output with a third order lowpass (Figure 5). AGND (Pins 3, 5): For dual supply operation these pins should be connected to a ground plane. For single supply operation both pins should be tied to one half supply, (Figure 3). V +, V - (Pins 4, 12): Should be bypassed with a 0.1F capacitor to an adequate AGND. Low noise, nonswitching power supplies are recommended. To avoid latchup when the power supplies exhibit high turn-on transients, a 1N5817 Schottky diode should be added from the V + and V - pins to ground (Figures 1, 2 and 3).
U
U
U
(Pin Numbers Refer to the 14-Pin Package)
RIN A, OUT C (Pins 7, 14): A very short connection between Pin 7 and Pin 14 is recommended. This connection should be preferably done under the IC package. In a breadboard use a one inch, or less, shielded coaxial cable: the shield should be grounded. In a PC board, use a one inch trace or less; surround the trace by a ground plane. 50/100 (Pin 10): The DC level at this pin determines the ratio of clock frequency to the -3dB frequency of the filter. The ratio is 50:1 when Pin 10 is at V + and 100:1 when Pin 10 is at V -. This pin should be bypassed with a 0.1F capacitor to analog ground when it's connected to V - or V + (Figure 1). See Tables 1 through 7 for typical gain and delay responses for the two ratios. fCLK (Pin 11): For 5V supplies the logic threshold level is 1.4V. For 8V and 0V to 5V supplies the logic threshold levels are 2.2V and 3V respectively. The logic threshold levels vary 100mV over the full military temperature range. The recommended duty cycle of the input clock is 50% although for clock frequencies below 500kHz the clock "on" time can be as low as 200ns. The maximum clock frequency for 5V supplies is 4MHz. For 7V supplies and above, the maximum clock frequency is 7MHz. Do not allow the clock levels to exceed the power supplies. For single supply operation 6V use level shifting at Pin 11 with T2L levels (Figure 4).
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LTC1064-2
TYPICAL APPLICATIO S
1 2 3 4 0.1F 5 6 NC VIN OUT C 14 NC 13 POWER SOURCE V+ V-
1 2 3 NC VIN OUT C NC 14 13 V- 1N5817 0.1F
LTC1064-2 12 V- AGND V+ AGND NC fCLK 50/100 VOUT NC 11 10 9 8 V+/V - 20k 0.1F 0.1F 20k 0.1F
V+ 1N5817 0.1F
7 RIN A
RECOMMENDED OP AMPS: LT1022, LT318, LT1056
Figure 1. Buffering the Filter Output. The Buffer Op Amp Should Not Share the LTC1064-2 Power Lines.
V+= 15V 0.1F 5k V+/2 0.1F 5k
Figure 3. Single Supply Operation. If Fast Power Up or Down Transients are Expected, Use a 1N5817 Schottky Diode Between Pin 4 and Pin 5. For V+ = 5V, Derive the Mid-Supply Voltage with a 7.5k Resistor and an LT1004 2.5V Reference.
8
U
LTC1064-2 12 V- AGND V+ AGND NC RIN A fCLK 50/100 VOUT NC 11 10 9 8
4 5 6
-
LT1006
8 VOUT
7
+
4 750
1064-2 F01
1064-2 F02
0.1F
Figure 2. Using Schottky Diodes to Protect the IC from Transient Supply Reversal.
1 2
NC VIN
OUT C
14
13 NC LTC1064-2 3 12 V- AGND 4 5 6 7 V+ AGND NC RIN A fCLK 50/100 VOUT NC 11 10 9 8 0V TO 10V
1064-2 F03
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LTC1064-2
TYPICAL APPLICATIO S
1 2 3 V+ 5k 4 5 6 0.1F 5k 7 NC VIN OUT C NC 14 13 V+ 2.2k T 2L LEVEL RATIO 5k 1F
1 2 3 V+ 0.1F 4 5 6 7
NC VIN
LTC1064-2 12 V- AGND V+ AGND NC RIN A fCLK 50/100 VOUT NC 11 10 + V /GND/V - 9 8
Figure 5. Adding an Output Buffer-Filter to Eliminate Any Clock Feedthrough. Passband 0.1dB to 50kHz, -3dB at 94kHz.
U
LTC1064-2 12 V- AGND V+ AGND NC RIN A fCLK 50/100 VOUT NC 11 10 9 8
1064-2 F04
Figure 4. Level Shifting the Input T2L Clock for Single Supply Operation 6V.
OUT C NC
14 13 V- 0.1F 100pF 20k VOUT
15V 10k 10k
-
LT1056
50 0.027F
1064-2 F05
220pF
+
-15V
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LTC1064-2
PACKAGE DESCRIPTIO U
J Package 14-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)
.785 (19.939) MAX 14 13 12 11 10 9 8 .005 (0.127) MIN .025 (0.635) RAD TYP .220 - .310 (5.588 - 7.874) 1 .300 BSC (7.62 BSC) 2 3 4 5 6 7 .200 (5.080) MAX .015 - .060 (0.381 - 1.524) 0 - 15 .045 - .065 (1.143 - 1.651) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS .014 - .026 (0.360 - 0.660) .100 (2.54) BSC .125 (3.175) MIN
J14 0801
.008 - .018 (0.203 - 0.457)
OBSOLETE PACKAGE
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LTC1064-2
PACKAGE DESCRIPTIO U
N Package 14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
.770* (19.558) MAX 14 13 12 11 10 9 8 .255 .015* (6.477 0.381) 1 .300 - .325 (7.620 - 8.255) .130 .005 (3.302 0.127) .020 (0.508) MIN .008 - .015 (0.203 - 0.381) +.035 .325 -.015 .005 (0.125) .100 MIN (2.54) BSC 2 3 4 5 6 7 .045 - .065 (1.143 - 1.651) .065 (1.651) TYP .120 (3.048) MIN .018 .003 (0.457 0.076)
N14 1002
(
+0.889 8.255 -0.381
)
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
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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.
11
LTC1064-2
PACKAGE DESCRIPTIO
.030 .005 TYP N
.420 MIN
1
2
3
RECOMMENDED SOLDER PAD LAYOUT 1 .291 - .299 (7.391 - 7.595) NOTE 4 .010 - .029 x 45 (0.254 - 0.737)
0 - 8 TYP
.005 (0.127) RAD MIN
.009 - .013 (0.229 - 0.330)
NOTE 3 .016 - .050 (0.406 - 1.270)
NOTE: 1. DIMENSIONS IN
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS 4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
U
SW Package 16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 .005 .398 - .413 (10.109 - 10.490) NOTE 4 16 15 14 13 12 11 10 9 N .325 .005 NOTE 3 .394 - .419 (10.007 - 10.643) N/2 N/2 2 3 4 5 6 7 8 .093 - .104 (2.362 - 2.642) .037 - .045 (0.940 - 1.143) .050 (1.270) BSC .004 - .012 (0.102 - 0.305) .014 - .019 (0.356 - 0.482) TYP
S16 (WIDE) 0502
10642fa LW/TP 1202 1K REV A * PRINTED IN USA
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1990

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