LT1462/LT1463 Dual/Quad Micropower, 260µW C-Load Picoampere Bias Current JFET Input Op Amps U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTION The LT ®1462 (dual) and LT1463 (quad) are the first micropower op amps (45µA 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. Input Bias Current: 2pA Max (LT1462A) 20pA Max (LT1462, LT1463) Supply Current per Amplifier: 45µA 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/µs Typ Guaranteed Matching Specifications Standard Pinout: SO-8, SO-14 Package 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/µs min) and gain bandwidth product (125kHz min) are 100% tested. A full set of matching specifications is also provided. U APPLICATIONS ■ ■ ■ Battery-Powered Systems Photocurrent Amplifiers Low Frequency, Micropower Active Filters Low Droop Track-and-Hold Circuits , LTC and LT are registered trademarks of Linear Technology Corporation. C-Load is a trademark of Linear Technology Corporation. U ■ TYPICAL APPLICATION Low Power Logging Amplifier R8 100k Q1 2N3904 C5 1µF D1 1N4148 C1 1nF R1 100Ω 5V 2 – 5 C5 200pF 6 4 1/4 LT1463 3 R5 24k + DC OUT C3 0.47µF + AMP 3 1/4 LT1463 – 1 Small-Signal Response, CL = 10nF R9 1M 7 R7 10M R10 50k D3 1N4148 11 –5V PHOTODIODE R2 24k C2 200pF 10 1/4 LT1463 9 + 1/4 LT1463 13 – R4 10M D2 1N4148 R3 100k 14 INPUT DC OUTPUT CURRENT VOLTAGE OF AMP 3 10pA –0.145V 100pA –0.341V 1nA –0.518V 10nA –0.684V 100nA –0.846V 1 µA –0.995V 10 µA –1.13V 100 µA –1.25V 1mA –1.37V 8 – R11 1M R6 100k 12 C4 10µF + R12 10k AC OUT R3 10k 1462 • TA01 AV = 1 VS = ±5V, ±15V CL = 10nF 1462 • TA02 1 LT1462/LT1463 W W U W ABSOLUTE MAXIMUM RATINGS Supply Voltage ..................................................... ±20V Differential Input Voltage ....................................... ±40V Input Current ....................................................... 20mA Output Short-Circuit Duration ......................... Indefinite Operating Temperature Range ............... – 40°C to 85°C Specified Temperature Range ................ – 40°C to 85°C Maximum Junction Temperature ......................... 150°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C W U U PACKAGE/ORDER INFORMATION ORDER PART NUMBER TOP VIEW OUT A 1 –IN A 2 A +IN B 3 B V– 4 N8 PACKAGE 8-LEAD PDIP 8 V+ 7 OUT B 6 –IN B 5 +IN B S8 PACKAGE 8-LEAD PLASTIC SO LT1462ACN8 LT1462ACS8 LT1462CN8 LT1462CS8 S8 PART MARKING 1462 1462A TJMAX = 150°C, θJA = 130°C/ W (N) TJMAX = 150°C, θJA = 190°C/ W (S) ORDER PART NUMBER TOP VIEW 14 OUT D OUT A 1 –IN A 2 +IN A 3 A D V+ 4 +IN B 5 LT1463CN LT1463CS 13 –IN D 12 +IN D 11 V – B C 10 +IN C –IN B 6 9 –IN C OUT B 7 8 OUT C N PACKAGE 14-LEAD PDIP S PACKAGE 14-LEAD PLASTIC SO TJMAX = 150°C, θJA = 110°C/ W (N) TJMAX = 150°C, θJA = 150°C/ W (S) Consult factory for Industrial and Military grade parts. ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, TA = 25°C, unless otherwise noted. MIN LT1462AC TYP MAX LT1462C/LT1463C MIN TYP MAX SYMBOL PARAMETER CONDITIONS (Note 1) VOS Input Offset Voltage VS = ±5V VS = ±15V 0.4 0.6 0.8 2.0 0.4 0.6 0.8 2.0 UNITS mV mV IOS Input Offset Current VS = ±5V VS = ±15V 0.3 0.5 1.2 2.0 0.5 15 pA pA VS = ±5V VS = ±15V ±0.5 ±1 ±2.0 ±3.0 ±1 ±20 pA pA IB Input Bias Current en Input Noise Voltage 0.1Hz to 10Hz 2 2 µVP-P Input Noise Voltage Density fO = 10Hz fO = 1000Hz 92 76 92 76 nV/√Hz nV/√Hz Input Noise Current Density fO = 10Hz, 1kHz (Note 3) 0.5 0.5 fA/√Hz CMRR Common Mode Rejection Ratio VCM = – 12.5V to 15V 76 89 74 89 dB PSRR Power Supply Rejection Ratio VS = ±2.5V to ±20V 81 90 78 90 dB 1012 1012 1012 1011 1012 1011 Ω Ω Ω 3 3 pF RIN Input Resistance—Differential Common Mode Common Mode CIN Input Capacitance AVOL Large-Signal Voltage Gain 2 VCM = – 12.5V to 8V VCM = 8V to 15V VO = ±10V, RL = 10k VS = ±5V, VO = ±2V, RL = 10k 100 50 600 200 100 50 600 200 V/mV V/mV LT1462/LT1463 ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, TA = 25°C, unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 1) VOUT Output Voltage Swing RL = 10k RL = 2k VS = ±5V, RL = 2k IO Output Current SR Slew Rate GBW Gain Bandwidth Product IS Supply Current per Amplifier MIN LT1462AC TYP MAX LT1462C/LT1463C MIN TYP MAX UNITS ±13.5 ±11.0 ±3.5 ±13.7 ±12.4 ±3.7 ±13.5 ±11.0 ±3.5 ±13.7 ±12.4 ±3.7 ±13 ±17 ±13 ±17 mA RL = 10k (Note 4) 0.08 0.13 0.08 0.13 V/µs f = 10kHz 125 175 125 175 kHz 45 43 28 26 V V V 45 43 µA µA VS = ±5V 28 26 Channel Separation f = 10Hz, VO = ±10V, RL = 10k 132 VOS Offset Voltage Match (Note 7) VS = ±5V VS = ±15V 0.5 0.8 1.3 3.0 0.5 0.8 1.3 3.0 mV mV ∆IB+ Noninverting Bias Current Match (Note 7) VS = ±5V VS = ±15V 0.4 0.5 3.0 4.0 0.5 20 pA pA ∆CMRR Common Mode Rejection Match (Notes 5, 7) 74 85 72 85 dB ∆PSRR Power Supply Rejection Match (Notes 5, 7) 78 88 76 88 dB 132 dB VS = ±15V, VCM = 0V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 1) MIN LT1462AC TYP MAX LT1462C/LT1463C MIN TYP MAX UNITS VOS Input Offset Voltage VS = ±5V VS = ±15V ● ● 0.5 0.9 1.4 2.8 0.5 0.9 1.4 2.8 mV mV ∆VOS ∆Temp Average Input Offset Voltage Drift (Note 6) ● 7 20 7 20 µV/°C IOS Input Offset Current ● 10 50 25 450 pA IB Input Bias Current ● 60 150 150 750 pA CMRR Common Mode Rejection Ratio VCM = – 12V to 15V ● 75 88 72 88 dB PSRR Power Supply Rejection Ratio VS = ±3V to ±20V ● 80 89 76 89 dB AVOL Large-Signal Voltage Gain VO = ±10V, RL = 10k VS = ±5V, VO = ±2V, RL = 2k ● ● 90 45 600 140 90 45 600 140 V/mV V/mV IO Output Current ● ±11 ±14 ±11 ±14 mA VOUT Output Voltage Swing RL = 10k RL = 2k VS = ±5V, RL = 2k ● ● ● ±13.4 ±10.5 ±3.4 ±13.6 ±12.1 ±3.6 ±13.4 ±10.5 ±3.4 ±13.6 ±12.1 ±3.6 V V V SR Slew Rate RL = 10k (Note 4) ● 0.075 0.128 0.075 0.128 V/µs GBW Gain Bandwidth Product f = 10kHz ● 100 140 100 140 kHz IS Supply Current per Amplifier VS = ±5V ● ● 31 28 45 43 31 28 45 43 µA µA VOS Offset Voltage Match (Note 7) VS = ±5V VS = ±15V ● ● 0.7 0.9 2.0 3.5 0.7 0.9 2.0 3.5 mV mV ∆IB+ Noninverting Bias Current Match (Note 7) ● 5 40 35 500 pA 3 LT1462/LT1463 ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. MIN LT1462AC TYP MAX LT1462C/LT1463C MIN TYP MAX SYMBOL PARAMETER CONDITIONS (Note 1) UNITS ∆CMRR Common Mode Rejection Match (Notes 5, 7) ● 73 84 70 84 dB ∆PSRR Power Supply Rejection Match (Notes 5, 7) ● 77 87 74 87 dB VS = ±15V, VCM = 0V, – 40°C ≤ TA ≤ 85°C (Note 2), unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 1) MIN LT1462AC TYP MAX LT1462C/LT1463C MIN TYP MAX UNITS VOS Input Offset Voltage VS = ±5V VS = ±15V ● ● 0.6 1.0 1.5 3.0 0.6 1.0 1.5 3.0 mV mV ∆VOS ∆Temp Average Input Offset Voltage Drift (Note 6) ● 7 20 7 20 µV/°C IOS Input Offset Current ● 40 150 60 700 pA IB Input Bias Current ● 200 500 300 2500 pA CMRR Common Mode Rejection Ratio VCM = –12V to 15V ● 74 87 70 87 dB PSRR Power Supply Rejection Ratio VS = ±3V to ±20V ● 79 88 74 88 dB AVOL Large-Signal Voltage Gain VO = ±10V, RL = 10k VS = ±5V, VO = ±2V, RL = 2k ● ● 80 40 500 120 80 40 500 120 V/mV V/mV IO Output Current ● ±10 ±13 ±10 ±13 mA VOUT Output Voltage Swing RL = 10k RL = 2k VS = ±5V, RL = 2k ● ● ● ±13.2 ±10.0 ±3.2 ±13.4 ±11.8 ±3.4 ±13.2 ±10.0 ±3.2 ±13.4 ±11.8 ±3.4 V V V SR Slew Rate RL = 10k (Note 4) ● 0.070 0.126 0.070 0.126 V/µs GBW Gain Bandwidth Product f = 10kHz ● 95 135 95 135 kHz IS Supply Current per Amplifier VS = ±5V ● ● 33 31 50 48 33 31 50 48 µA µA VOS Offset Voltage Match (Note 7) VS = ±5V VS = ±15V ● ● 0.8 1.0 2.5 4.0 0.8 1.0 2.5 4.0 mV mV ∆IB+ Noninverting Bias Current Match (Note 7) ● 20 100 70 800 pA ∆CMRR Common Mode Rejection Match (Notes 5, 7) ● 72 83 68 83 dB ∆PSRR Power Supply Rejection Match (Notes 5, 7) ● 76 86 72 86 dB The ● 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 – 40°C and 85°C. 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. 4 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 µV/V on the individual amplifiers. 2. The difference is calculated between the matching sides in µV/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. LT1462/LT1463 U W TYPICAL PERFORMANCE CHARACTERISTICS Input Bias and Offset Current vs Temperature 20 VS = ±15V VCM = 0V LT1462/LT1463 LT1462A 100 BIAS CURRENT 10 15 15 COMMON MODE RANGE (V) 1000 16 VS = ±15V TA = 25°C INPUT BIAS CURRENT (pA) 10 5 0 OFFSET CURRENT 1 0 25 75 100 50 AMBIENT TEMPERATURE (°C) –5 –15 125 10 –5 0 5 –10 COMMON MODE INPUT VOLTAGE (V) 13 12 –11 –12 –13 Supply Current vs Temperature 50 40 VS = ±15V VS = ±5V 20 100 1/f CORNER = 5Hz 30 0.1 100 125 1 200 SLEW RISE SLEW RATE (V/µs) 400 VS = ±5V 160 400 VS = ±15V 0.15 500 300 0.17 VO = ±10V, VS = ±15V VO = ±2V, VS = ±5V RL = 10k VS = ±15V 6 4 TIME (SEC) 300 SLEW FALL 0.13 200 GAIN BANDWIDTH 0.11 8 10 Channel Separation vs Frequency 100 GAIN BANDWIDTH (kHz) 600 2 LT1462 • TPC06 Slew Rate, Gain Bandwidth Product vs Temperature 1000 700 0 1000 10 100 FREQUENCY (Hz) LT1462 • TPC05 Voltage Gain vs Temperature 800 0.1Hz to 10Hz Noise VS = ±15V TA = 25°C LT1462 • TPC04 900 LT1462 • TPC03 NOISE VOLTAGE (2µV/DIV) RMS VOLTAGE NOISE DENSITY (nV/√Hz) 1000 10 25 50 75 –75 –50 –25 0 TEMPERATURE (°C) 15 Voltage Noise vs Frequency 60 30 VS = ±15V –15 –75 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) LT1462 • TPC02 LT1462 • TPC01 SUPPLY CURRENT PER AMPLIFIER (µA) 14 –14 CHANNEL SEPARATION (dB) INPUT BIAS AND OFFSET CURRENT (pA) 10000 VOLTAGE GAIN (V/mV) Common Mode Range vs Temperature Input Bias Current Over the Common Mode Range VS = ±15V TA = 25°C RL = 10k 140 120 100 80 100 0 –75 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 125 LT1463 • TPC07 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 U W TYPICAL PERFORMANCE CHARACTERISTICS 100 80 PHASE 40 60 30 40 20 20 GAIN 10 0 0 PHASE MARGIN (DEG) 50 –20 –10 1 VS = ±15V TA = 25°C 80 60 40 20 –40 1000 10 100 FREQUENCY (kHz) 120 100 POSITIVE SUPPLY 80 NEGATIVE SUPPLY 60 40 20 0 10 100 10k 1k FREQUENCY (Hz) 100k 10 1M 100 95 VS = ±15V TA = 25°C Closed-Loop Output Impedance 10k VS = ±2.5V TO ±20V FOR PSRR VS = ±15V, VCM = –12V TO 15V FOR CMRR VS = ±15V TA = 25°C AV = 1 30 OUTPUT IMEDANCE (Ω) 60 CMRR, PSRR (dB) PHASE MARGIN (DEG) 1k 40 1M 100k LTC1462 • TPC12 Common Mode and Power Supply Rejections vs Temperature 50 1k 10k FREQUENCY (Hz) LT1462 • TPC11 Phase Margin vs CLOAD 70 100 0 LT1462 • TPC10 80 TA = 25°C POWER SUPPLY REJECTION RATIO (dB) 60 VOLTAGE GAIN (dB) 120 VS = ±15V TA = 25°C COMMON MODE REJECTION RATIO (dB) 70 Power Supply Rejection Ratio vs Frequency Common Mode Rejection Ratio vs Frequency Gain and Phase vs Frequency PSRR 90 CMRR 85 20 CL = 0pF CL = 1000pF 100 CL = 10nF 10 1 10 0 1 100 10 1000 CAPACITIVE LOAD (pF) 10000 80 25 50 75 –75 –50 –25 0 TEMPERATURE (°C) 10 0.1ms/DIV 0V AV = 1 CL = 10pF LT1462 • TPC16 10k 1k FREQUENCY (Hz) 100k 1M Small-Signal Response, VS = ±5V, ±15V, CL = 1000pF 50mV/DIV 0V 100 LT1462 • TPC15 Small-Signal Response, VS = ±5V, ±15V 20mV/DIV 5V/DIV Large-Signal Response, VS = ±15V 6 0.1 LT1462 • TPC14 LT1462 • TPC13 AV = 1 CL = 10pF 100 125 5µs/DIV 0V AV = 1 CL = 1000pF LT1462 • TPC17 50µs/DIV LT1462 • TPC18 LT1462/LT1463 U W U U 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. LT1462 • F01b LT1462 • F01a (1a) ±5.2V Sine Wave (1b) Typical JFET Input Op Amp with ±5V Supplies LT1462 • F01c (1c) LT1462/LT1463 Output with ±5V Supplies Figure 1. Voltage Follower with Input Exceeding the Common Mode Range (VS = ±5V) 7 LT1462/LT1463 U TYPICAL APPLICATIONS 10Hz 4th Order Chebyshev Lowpass Filter (0.01dB Ripple) R2 237k R5 154k C1 33nF R1 237k C3 10nF 15V R3 249k 2 VIN C2 100nF – 4 1/4 LT1463 3 R6 249k R4 154k 1 13 + 1/4 LT1463 C4 330nF 11 – 12 14 + VOUT LT1462 • TA05 –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 75k* 10k GAIN TRIM C2 1µF R1 1k –5V 13 LT1004-1.2 2 14 C1 1µF – 8 1/2 LT1462 3 12 fIN = FREQUENCY IN 0kHz TO 30kHz 5V 1/4 LTC®1043 VREF = –1.235V 16 CS 1000pF 4 5V 17 –5V + 1 0V TO 3V OUTPUT 4 –5V V OUT = (R2)(CS)(VREF)(fIN) *TRW#MTR-5/120ppm LT1462 • TA04 8 LT1462/LT1463 W W SI PLIFIED SCHE ATIC VCC R20 R6 R3 R4 Q3 ×4 Q4 R7 Q5 J4 J3 R5 Q17 Q7 R17 – IN Q18 Q20 J5 R22 C2 R10 Q16 +IN Q22 R18 OUT J1 J2 VCC VCC Q21 C1 Q15 Q28 VEE Q25 Q13 Q14 Q1 Q8 R5 Q23 R16 Q11 1µA R1 R19 R1O Q29 Q2 Q9 R2 R5 Q19 Q24 VEE Q10 Q26 Q27 R10 1462 SS VEE 9 LT1462/LT1463 U 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 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) ( +0.635 –0.381 0.125 (3.175) MIN 0.005 (0.127) MIN +0.025 0.325 –0.015 8.255 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) ) 0.018 ± 0.003 (0.457 ± 0.076) 0.100 ± 0.010 (2.540 ± 0.254) 0.015 (0.380) MIN N8 0695 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 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 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 1 0.010 – 0.020 × 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 *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 0.014 – 0.019 (0.355 – 0.483) 2 3 4 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC SO8 0695 LT1462/LT1463 U 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 1 2 3 4 5 6 7 0.255 ± 0.015* (6.477 ± 0.381) 0.130 ± 0.005 (3.302 ± 0.127) 0.300 – 0.325 (7.620 – 8.255) 0.045 – 0.065 (1.143 – 1.651) 0.015 (0.380) MIN 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) +0.025 0.325 –0.015 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) ( +0.635 8.255 –0.381 ) 0.018 ± 0.003 (0.457 ± 0.076) 0.125 (3.175) MIN 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 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 2 3 4 5 6 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0° – 8° TYP 0.016 – 0.050 0.406 – 1.270 0.014 – 0.019 (0.355 – 0.483) 7 0.050 (1.270) TYP *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. S14 0695 11 LT1462/LT1463 U TYPICAL APPLICATION Micropower 0.016% Voltage-to-Frequency Converter LT1009 VREF = – 2.5V R3 1k –5V C4 1µF 17 1/2 LTC1043 5V 8 7 fOUT: 0kHz TO 3kHz 11 14 13 fOUT = RIN 12 4 VIN 0V TO 5V 6.19k GAIN 2.5k 5V 6 C1 1µF – 5 + 4 –5V R1 100k )( ) VIN 1 (RIN)(CIN) VREF 16 CIN 0.1µF 8 1/2 LT1462 ( 7 C2 30pF R3 330k Q1 2N2907A C3 1µF –5V LT1462 • TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1057 Dual JFET Input, Precision, High Speed Op Amp Fast Settling Time, 14V/µs Slew Rate, 5MHz GBW, 450µV VOS(MAX), 50pA IOS(MAX) LT1113 Dual Low Noise, Precision, JFET Input Op Amp 6nV/√Hz Input Noise Voltage Density, 480pA IB, 6.3MHz GBW LT1169 Dual Low Noise, Picoampere Bias Current, JFET Input Op Amp 20pA IB, 8nV/√Hz en, 5.3MHz GBW, 1.5pF Input Capacitance LT1457 Dual Precision JFET Input Op Amp C-Load Drives 10,000pF Capacitive Load, 450µV VOS(MAX), 4µV/°C Drift LT1464/LT1465 Dual/Quad Micropower, C-Load Picoampere Bias Current JFET Input Op Amps Drive 10nF Capacitive Loads, 1MHz GBW 12 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● (408) 432-1900 FAX: (408) 434-0507● TELEX: 499-3977 ● www.linear-tech.com 14623fa LT/GP 0197 5K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1996