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LT1462/LT1463 Dual/Quad Micropower, 260W C-Load Picoampere Bias Current JFET Input Op Amps
FEATURES
s
DESCRIPTION
The LT (R)1462 (dual) and LT1463 (quad) are the first micropower op amps (45A max per amp) to offer picoampere input bias currents (1pA typ) and unity gain stability for capacitive loads up to 10nF. The output can swing a 10k load to within 1.5V of either supply, just like op amps that require an order of magnitude more supply current. This unique combination of performance makes the LT1462/LT1463 ideal over a wide range of input and output impedances. In the design and testing of the LT1462/LT1463, particular emphasis has been placed on optimizing performance in the low cost SO-8 (dual) and 14-lead SO package (quad) for 15V and 5V supplies. The input common mode range includes the positive rail. Slew rate (0.08V/s min) and gain bandwidth product (125kHz min) are 100% tested. A full set of matching specifications is also provided.
, LTC and LT are registered trademarks of Linear Technology Corporation. C-Load is a trademark of Linear Technology Corporation.
s s s s s s s s
Input Bias Current: 2pA Max (LT1462A) 20pA Max (LT1462, LT1463) Supply Current per Amplifier: 45A Max Unity-Gain Stable for C-LoadTM Up to 10nF Input Common Mode Range Includes Positive Rail Guaranteed Specs with 5V, 15V Supplies Gain Bandwidth Product: 175kHz Typ Slew Rate: 0.13V/s Typ Guaranteed Matching Specifications Standard Pinout: SO-8, SO-14 Package
APPLICATIONS
s s s s
Battery-Powered Systems Photocurrent Amplifiers Low Frequency, Micropower Active Filters Low Droop Track-and-Hold Circuits
TYPICAL APPLICATION
Low Power Logging Amplifier
R8 100k D1 1N4148 C1 1nF R5 24k C5 200pF 1 D3 1N4148 R6 100k 12 Q1 2N3904 C5 1F R9 1M DC OUT C3 0.47F 7 C4 10F 8 AC OUT R3 10k
5
+
AMP 3 1/4 LT1463
PHOTODIODE R2 24k C2 200pF
+
3
-
R1 100
5V 2 4
6
-
1/4 LT1463 11 -5V
R7 10M
R10 50k
10
+
1/4 LT1463
9
-
R11 1M
+
1/4 LT1463 14
13
-
R4 10M D2 1N4148
R3 100k
INPUT DC OUTPUT CURRENT VOLTAGE OF AMP 3 10pA -0.145V 100pA -0.341V 1nA -0.518V 10nA -0.684V 100nA -0.846V 1 A -0.995V 10 A -1.13V 100 A -1.25V 1mA -1.37V
R12 10k
1462 * TA01
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Small-Signal Response, CL = 10nF
AV = 1 VS = 5V, 15V CL = 10nF
1462 * TA02
1
LT1462/LT1463
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ..................................................... 20V Differential Input Voltage ....................................... 40V Input Current ....................................................... 20mA Output Short-Circuit Duration ......................... Indefinite Operating Temperature Range ............... - 40C to 85C Specified Temperature Range ................ - 40C to 85C Maximum Junction Temperature ......................... 150C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
TOP VIEW OUT A 1 -IN A 2 +IN B 3 V- 4 N8 PACKAGE 8-LEAD PDIP A B 8 7 6 5 V+ OUT B -IN B +IN B
ORDER PART NUMBER LT1462ACN8 LT1462ACS8 LT1462CN8 LT1462CS8 S8 PART MARKING 1462 1462A
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/ W (N) TJMAX = 150C, JA = 190C/ W (S)
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER VOS IOS IB en Input Offset Voltage Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density CMRR PSRR RIN Common Mode Rejection Ratio Power Supply Rejection Ratio Input Resistance--Differential Common Mode Common Mode Input Capacitance Large-Signal Voltage Gain VS = 5V VS = 15V VS = 5V VS = 15V VS = 5V VS = 15V 0.1Hz to 10Hz fO = 10Hz fO = 1000Hz
VS = 15V, VCM = 0V, TA = 25C, unless otherwise noted.
MIN LT1462AC TYP MAX 0.4 0.6 0.3 0.5 0.5 1 2 92 76 0.5 76 81 89 90 1012 1012 1011 3 100 50 600 200 100 50 74 78 0.8 2.0 1.2 2.0 2.0 3.0 LT1462C/LT1463C MIN TYP MAX 0.4 0.6 0.5 1 2 92 76 0.5 89 90 1012 1012 1011 3 600 200 0.8 2.0 15 20 UNITS mV mV pA pA pA pA VP-P nV/Hz nV/Hz fA/Hz dB dB pF V/mV V/mV
CONDITIONS (Note 1)
fO = 10Hz, 1kHz (Note 3) VCM = - 12.5V to 15V VS = 2.5V to 20V VCM = - 12.5V to 8V VCM = 8V to 15V VO = 10V, RL = 10k VS = 5V, VO = 2V, RL = 10k
CIN AVOL
2
U
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W
WW U
W
TOP VIEW OUT A 1 -IN A 2 +IN A 3 V+ 4 +IN B 5 -IN B 6 OUT B 7 N PACKAGE 14-LEAD PDIP B C A D 14 OUT D 13 -IN D 12 +IN D 11 V - 10 +IN C 9 8 -IN C OUT C
ORDER PART NUMBER LT1463CN LT1463CS
S PACKAGE 14-LEAD PLASTIC SO
TJMAX = 150C, JA = 110C/ W (N) TJMAX = 150C, JA = 150C/ W (S)
LT1462/LT1463
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER VOUT Output Voltage Swing
VS = 15V, VCM = 0V, TA = 25C, unless otherwise noted.
MIN 13.5 11.0 3.5 13 LT1462AC TYP MAX 13.7 12.4 3.7 17 0.13 175 28 26 132 0.5 0.8 0.4 0.5 74 78 85 88 1.3 3.0 3.0 4.0 72 76 45 43 LT1462C/LT1463C MIN TYP MAX 13.5 11.0 3.5 13 0.08 125 13.7 12.4 3.7 17 0.13 175 28 26 132 0.5 0.8 0.5 85 88 1.3 3.0 20 45 43 UNITS V V V mA V/s kHz A A dB mV mV pA pA dB dB
CONDITIONS (Note 1) RL = 10k RL = 2k VS = 5V, RL = 2k
IO SR GBW IS
Output Current Slew Rate Gain Bandwidth Product Supply Current per Amplifier VS = 5V Channel Separation f = 10Hz, VO = 10V, RL = 10k VS = 5V VS = 15V VS = 5V VS = 15V (Notes 5, 7) (Notes 5, 7) RL = 10k (Note 4) f = 10kHz
0.08 125
VOS IB+ CMRR PSRR
Offset Voltage Match (Note 7) Noninverting Bias Current Match (Note 7) Common Mode Rejection Match Power Supply Rejection Match
VS = 15V, VCM = 0V, 0C TA 70C, unless otherwise noted.
SYMBOL PARAMETER VOS VOS Temp IOS IB CMRR PSRR AVOL IO VOUT Input Offset Voltage Average Input Offset Voltage Drift Input Offset Current Input Bias Current Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Output Current Output Voltage Swing RL = 10k RL = 2k VS = 5V, RL = 2k RL = 10k (Note 4) f = 10kHz VS = 5V Offset Voltage Match (Note 7) Noninverting Bias Current Match (Note 7) VS = 5V VS = 15V VCM = - 12V to 15V VS = 3V to 20V VO = 10V, RL = 10k VS = 5V, VO = 2V, RL = 2k CONDITIONS (Note 1) VS = 5V VS = 15V (Note 6)
q q q
MIN
LT1462AC TYP MAX 0.5 0.9 7 10 60 1.4 2.8 20 50 150
LT1462C/LT1463C MIN TYP MAX 0.5 0.9 7 25 150 72 76 90 45 11 13.4 10.5 3.4 0.075 100 88 89 600 140 14 13.6 12.1 3.6 0.128 140 31 28 0.7 0.9 35 45 43 2.0 3.5 500 1.4 2.8 20 450 750
UNITS mV mV V/C pA pA dB dB V/mV V/mV mA V V V V/s kHz A A mV mV pA
q q q q q q q q q q q q q q q q q
75 80 90 45 11 13.4 10.5 3.4 0.075 100
88 89 600 140 14 13.6 12.1 3.6 0.128 140 31 28 0.7 0.9 5 45 43 2.0 3.5 40
SR GBW IS VOS IB+
Slew Rate Gain Bandwidth Product Supply Current per Amplifier
3
LT1462/LT1463
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CMRR PSRR Common Mode Rejection Match Power Supply Rejection Match (Notes 5, 7) (Notes 5, 7)
VS = 15V, VCM = 0V, 0C TA 70C, unless otherwise noted.
MIN
q q
CONDITIONS (Note 1)
LT1462AC TYP MAX 84 87
LT1462C/LT1463C MIN TYP MAX 70 74 84 87
UNITS dB dB
73 77
VS = 15V, VCM = 0V, - 40C TA 85C (Note 2), unless otherwise noted.
SYMBOL PARAMETER VOS VOS Temp IOS IB CMRR PSRR AVOL IO VOUT Input Offset Voltage Average Input Offset Voltage Drift Input Offset Current Input Bias Current Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Output Current Output Voltage Swing RL = 10k RL = 2k VS = 5V, RL = 2k RL = 10k (Note 4) f = 10kHz VS = 5V Offset Voltage Match (Note 7) Noninverting Bias Current Match (Note 7) Common Mode Rejection Match Power Supply Rejection Match (Notes 5, 7) (Notes 5, 7) VS = 5V VS = 15V VCM = -12V to 15V VS = 3V to 20V VO = 10V, RL = 10k VS = 5V, VO = 2V, RL = 2k CONDITIONS (Note 1) VS = 5V VS = 15V (Note 6)
q q q
MIN
LT1462AC TYP MAX 0.6 1.0 7 40 200 1.5 3.0 20 150 500
LT1462C/LT1463C MIN TYP MAX 0.6 1.0 7 60 300 70 74 80 40 10 13.2 10.0 3.2 0.070 95 87 88 500 120 13 13.4 11.8 3.4 0.126 135 33 31 0.8 1.0 70 68 72 83 86 50 48 2.5 4.0 800 1.5 3.0 20 700 2500
UNITS mV mV V/C pA pA dB dB V/mV V/mV mA V V V V/s kHz A A mV mV pA dB dB
q q q q q q q q q q q q q q q q q q q
74 79 80 40 10 13.2 10.0 3.2 0.070 95
87 88 500 120 13 13.4 11.8 3.4 0.126 135 33 31 0.8 1.0 20 50 48 2.5 4.0 100
SR GBW IS VOS IB+ CMRR PSRR
Slew Rate Gain Bandwidth Product Supply Current per Amplifier
72 76
83 86
The q denotes specifications which apply over the full operating temperature range. Note 1: Typical parameters are defined as 60% yield of parameter distributions of individual amplifiers, i.e., out of 100 LT1463s (or 100 LT1462s) typically 240 op amps (or 120) will be better than the indicated specification. Note 2: The LT1462 and LT1463 are designed, characterized and expected to meet these extended temperature limits, but are not tested at - 40C and 85C. Guaranteed I grade parts are available, consult factory. Note 3: Current noise is calculated from the formula: in = (2qib)1/2 where q = (1.6)(10-19) coulomb. The noise of source resistors up to 1G swamps the contribution of current noise.
Note 4: Slew rate is measured in AV = -1; input signal is 7.5V, output is measured at 2.5V. Note 5: CMRR and PSRR are defined as follows: 1. CMRR and PSRR are measured in V/V on the individual amplifiers. 2. The difference is calculated between the matching sides in V/V. 3. The result is converted to dB. Note 6: This parameter is not 100% tested. Note 7: Matching parameters are the difference between amplifiers A and D and between B and C on the LT1463; between the two amplifiers on the LT1462.
4
LT1462/LT1463 TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias and Offset Current vs Temperature
10000 20 VS = 15V VCM = 0V LT1462/LT1463 LT1462A VS = 15V TA = 25C
INPUT BIAS AND OFFSET CURRENT (pA)
1000
COMMON MODE RANGE (V)
10 -5 0 5 -10 COMMON MODE INPUT VOLTAGE (V) 15
LT1462 * TPC02
INPUT BIAS CURRENT (pA)
100 BIAS CURRENT
10 OFFSET CURRENT 1 0 25 75 100 50 AMBIENT TEMPERATURE (C) 125
Supply Current vs Temperature
60
SUPPLY CURRENT PER AMPLIFIER (A)
40 VS = 15V VS = 5V 20
30
100 1/f CORNER = 5Hz 30 0.1
10 25 50 75 -75 -50 -25 0 TEMPERATURE (C)
100 125
LT1462 * TPC04
NOISE VOLTAGE (2V/DIV)
50
RMS VOLTAGE NOISE DENSITY (nV/Hz)
Voltage Gain vs Temperature
1000 900 800 VO = 10V, VS = 15V VO = 2V, VS = 5V RL = 10k VS = 15V
SLEW RATE (V/s)
VOLTAGE GAIN (V/mV)
0.15 SLEW FALL 0.13 GAIN BANDWIDTH 0.11
300
700 600 500 400 300 200 100
CHANNEL SEPARATION (dB)
VS = 5V
0 -75 -50 -25 0 25 50 75 TEMPERATURE (C)
UW
LT1462 * TPC01
LT1463 * TPC07
Input Bias Current Over the Common Mode Range
16 15 14 13 12
Common Mode Range vs Temperature
15
10
5
-11 -12 -13 -14 VS = 15V -15 -75 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
LT1462 * TPC03
0
-5 -15
Voltage Noise vs Frequency
1000 VS = 15V TA = 25C
0.1Hz to 10Hz Noise
1
10 100 FREQUENCY (Hz)
1000
LT1462 * TPC05
0
2
6 4 TIME (SEC)
8
10
LT1462 * TPC06
Slew Rate, Gain Bandwidth Product vs Temperature
0.17 VS = 15V SLEW RISE
GAIN BANDWIDTH (kHz)
Channel Separation vs Frequency
400
160
140
VS = 15V TA = 25C RL = 10k
120
200
100
100
80
100 125
0.09 -75 -50 -25
0 0 25 50 75 100 125 150 TEMPERATURE (C)
LT1462 * TPC08
60 10 100 10k 1k FREQUENCY (Hz) 100k 1M
LT1462 * TPC09
5
LT1462/LT1463 TYPICAL PERFORMANCE CHARACTERISTICS
Gain and Phase vs Frequency
70 60 50 VOLTAGE GAIN (dB) 40 30 20 10 0 -10 1 10 100 FREQUENCY (kHz) GAIN
COMMON MODE REJECTION RATIO (dB)
100 PHASE 80 60 40 20 0 -20 -40 1000
LT1462 * TPC10
POWER SUPPLY REJECTION RATIO (dB)
VS = 15V TA = 25C
Phase Margin vs CLOAD
80 70
PHASE MARGIN (DEG)
VS = 15V TA = 25C
CMRR, PSRR (dB)
50 40 30 20 10 0 1 100 10 1000 CAPACITIVE LOAD (pF) 10000
90
PSRR CMRR
OUTPUT IMEDANCE ()
60
Large-Signal Response, VS = 15V
20mV/DIV
0V
0V
50mV/DIV
5V/DIV
AV = 1 CL = 10pF
0.1ms/DIV
LT1462 * TPC16
6
UW
LT1462 * TPC13
Common Mode Rejection Ratio vs Frequency
120
Power Supply Rejection Ratio vs Frequency
120 TA = 25C 100 POSITIVE SUPPLY 80 NEGATIVE SUPPLY 60 40 20 0
100 VS = 15V TA = 25C 80
PHASE MARGIN (DEG)
60
40
20
0 10 100 10k 1k FREQUENCY (Hz) 100k 1M
10
100
1k 10k FREQUENCY (Hz)
100k
1M
LT1462 * TPC11
LTC1462 * TPC12
Common Mode and Power Supply Rejections vs Temperature
95
Closed-Loop Output Impedance
10k VS = 15V TA = 25C AV = 1 CL = 0pF
VS = 2.5V TO 20V FOR PSRR VS = 15V, VCM = -12V TO 15V FOR CMRR
1k
100
CL = 1000pF CL = 10nF
10
85
1
80 25 50 75 -75 -50 -25 0 TEMPERATURE (C)
100 125
LT1462 * TPC14
0.1 10 100 10k 1k FREQUENCY (Hz) 100k 1M
LT1462 * TPC15
Small-Signal Response, VS = 5V, 15V
Small-Signal Response, VS = 5V, 15V, CL = 1000pF
0V
AV = 1 CL = 10pF
5s/DIV
LT1462 * TPC17
AV = 1 CL = 1000pF
50s/DIV
LT1462 * TPC18
LT1462/LT1463
APPLICATIONS INFORMATION
Phase Reversal Protection Most industry standard JFET input single, dual and quad op amps exhibit phase reversal at the output when the negative common mode limit at the input is exceeded. Common mode range is at a premium at 5V supplies. The Figures show a 5.2V sine wave input (Figure 1a), the response of a competing JFET input op amp in the unitygain follower mode (Figure 1b) and the response of the LT1462/LT1463 (Figure 1c). The phase reversal of Figure 1b can cause lock-up in servo systems. The LT1462/LT1463 does not phase-reverse when the common mode input is anywhere within the supplies.
(1a) 5.2V Sine Wave
(1c) LT1462/LT1463 Output with 5V Supplies Figure 1. Voltage Follower with Input Exceeding the Common Mode Range (VS = 5V)
U
W
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LT1462 * F01a
LT1462 * F01b
(1b) Typical JFET Input Op Amp with 5V Supplies
LT1462 * F01c
7
LT1462/LT1463
TYPICAL APPLICATIONS
10Hz 4th Order Chebyshev Lowpass Filter (0.01dB Ripple)
R2 237k C1 33nF 15V
VIN C2 100nF
1/4 LT1463
-15V
TYPICAL OFFSET 0.6mV 1% TOLERANCES FOR VIN = 10VP-P,V OUT = -110dB AT f > 300Hz V OUT = -6dB AT f = 16Hz THE LOW INPUT BIAS CURRENTS ALLOW THE USE OF HIGH RESISTOR VALUES
Micropower 0.026% Frequency-to-Voltage Converter
R2 10k GAIN TRIM C2 1F
R1 1k -5V LT1004-1.2
VREF = -1.235V 13 C1 1F
1/4 LTC(R)1043 14 2
3 12 4 CS 1000pF 5V
fIN = FREQUENCY IN 0kHz TO 30kHz
16
17
-5V
8
+
+
3
11
C4 330nF
12
-
-
R1 237k
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R5 154k C3 10nF 4 1
R3 249k
2
R4 154k
R6 249k
13
1/4 LT1463
14
VOUT
LT1462 * TA05
75k*
5V
- +
8 1 0V TO 3V OUTPUT
1/2 LT1462 4
-5V V OUT = (R2)(CS)(VREF)(fIN) *TRW#MTR-5/120ppm
LT1462 * TA04
LT1462/LT1463
SI PLIFIED SCHE ATIC
VCC
R6
R3 Q3 x4
J3
+IN - IN
J1 J2 VCC C1 Q15 Q11 VEE Q28 R16 Q25 Q24
1A
Q14
W
Q8
W
R20 R4 R5 R7 Q17
Q4
Q5
Q7
R17
Q22
Q18 Q20
J4
J5 Q16 R10 C2 R22
R18 OUT
VCC Q29 R1O Q21 Q23 Q19 R19
Q13
VEE
Q1
Q2
Q9
Q10
Q26
Q27
R5
R1
R2
R5
R10
1462 SS
VEE
9
LT1462/LT1463
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
N8 Package 8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400* (10.160) MAX 8 7 6 5
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
(
+0.025 0.325 -0.015 8.255 +0.635 -0.381
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
0.016 - 0.050 0.406 - 1.270 *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
10
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0.255 0.015* (6.477 0.381)
1
2
3
4 0.130 0.005 (3.302 0.127)
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.005 (0.127) MIN 0.100 0.010 (2.540 0.254) 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076) 0.015 (0.380) MIN
N8 0695
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
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) BSC
SO8 0695
LT1462/LT1463
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
N Package 14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770* (19.558) MAX 14 13 12 11 10 9 8
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381) 0.005 (0.125) MIN 0.100 0.010 (2.540 0.254) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) +0.025 0.325 -0.015 +0.635 8.255 -0.381
(
)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0 - 8 TYP
0.016 - 0.050 0.406 - 1.270
*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
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
0.255 0.015* (6.477 0.381)
1 0.130 0.005 (3.302 0.127) 0.015 (0.380) MIN
2
3
4
5
6
7
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076)
N14 0695
S Package 14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 - 0.344* (8.560 - 8.738) 14 13 12 11 10 9 8
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
5
6
7
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) TYP
S14 0695
11
LT1462/LT1463
TYPICAL APPLICATION
Micropower 0.016% Voltage-to-Frequency Converter
RIN 4 VIN 0V TO 5V 6.19k GAIN 2.5k C1 1F 5V 6 8 7 12 CIN 0.1F 16
RELATED PARTS
PART NUMBER LT1057 LT1113 LT1169 LT1457 LT1464/LT1465 DESCRIPTION Dual JFET Input, Precision, High Speed Op Amp Dual Low Noise, Precision, JFET Input Op Amp Dual Low Noise, Picoampere Bias Current, JFET Input Op Amp Dual Precision JFET Input Op Amp C-Load Dual/Quad Micropower, C-Load Picoampere Bias Current JFET Input Op Amps COMMENTS Fast Settling Time, 14V/s Slew Rate, 5MHz GBW, 450V VOS(MAX), 50pA IOS(MAX) 6nV/Hz Input Noise Voltage Density, 480pA IB, 6.3MHz GBW 20pA IB, 8nV/Hz en, 5.3MHz GBW, 1.5pF Input Capacitance Drives 10,000pF Capacitive Load, 450V VOS(MAX), 4V/C Drift Drive 10nF Capacitive Loads, 1MHz GBW
12
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
-5V
R3 1k
LT1009 VREF = - 2.5V C4 1F
17 5V 8 1/2 LTC1043 7
11 14 13
fOUT: 0kHz TO 3kHz fOUT =
(
VIN 1 (RIN)(CIN) VREF
)( )
- +
1/2 LT1462 5 4 -5V R1 100k
C2 30pF
R3 330k C3 1F
LT1462 * TA03
Q1 2N2907A -5V
14623fa LT/GP 0197 5K REV A * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1996

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