LT1462/LT1463 Dual/Quad Micropower, 260W C-Load Picoampere Bias Current JFET Input Op Amps FEATURES DESCRIPTION n Input Bias Current: The LT 1462 (dual) and LT1463 (quad) are the first 2pA Max (LT1462A) micropower op amps (45A max per amp) to offer 20pA Max (LT1462, LT1463) picoampere input bias currents (1pA typ) and unity gain n Supply Current per Amplifier: 45A Max stability for capacitive loads up to 10nF. The output can TM n Unity-Gain Stable for C-Load Up to 10nF swing a 10k load to within 1.5V of either supply, just like n Input Common Mode Range Includes Positive Rail op amps that require an order of magnitude more supply n Guaranteed Specs with 5V, 15V Supplies current. This unique combination of performance makes n Gain Bandwidth Product: 175kHz Typ the LT1462/LT1463 ideal over a wide range of input and n Slew Rate: 0.13V/s Typ output impedances. n Guaranteed Matching Specifications In the design and testing of the LT1462/LT1463, particular n Standard Pinout: SO-8, SO-14 Package emphasis has been placed on optimizing performance in U the low cost SO-8 (dual) and 14-lead SO package (quad) for APPLICATIONS 15V and 5V supplies. The input common mode range includes the positive rail. Slew rate (0.08V/s min) and gain n Battery-Powered Systems bandwidth product (125kHz min) are 100% tested. A full set n Photocurrent Amplifiers of matching specifications is also provided. n Low Frequency, Micropower Active Filters , LTC and LT are registered trademarks of Linear Technology Corporation. n Low Droop Track-and-Hold Circuits C-Load is a trademark of Linear Technology Corporation. TYPICAL APPLICATION Low Power Logging Amplifier R8 Q1 100k 2N3904 C5 D1 Small-Signal Response, C = 10nF 1F L 1N4148 R9 1M C1 DC R5 1nF OUT 24k C3 5 + 0.47F AMP 3 7 C5 R1 5V 1/4 LT1463 200pF 100 6 2 4 C4 R7 10 R10 1 + 10F 10M 1/4 LT1463 50k AC 8 3 + 1/4 LT1463 OUT D3 11 9 1N4148 R3 5V 10k R11 PHOTODIODE R6 1M 100k R2 24k 1462 TA01 R12 12 1462 TA02 + A = 1 10k V INPUT DC OUTPUT 14 V = 5V, 15V C2 S 1/4 LT1463 CURRENT VOLTAGE OF AMP 3 200pF C = 10nF 13 L 10pA 0.145V R4 100pA 0.341V 10M 1nA 0.518V 10nA 0.684V D2 100nA 0.846V 1N4148 1A 0.995V 10A 1.13V 100 A 1.25V 1mA 1.37V R3 100k 1 U ULT1462/LT1463 ABSOLUTE MAXIMUM RATINGS Supply Voltage ..................................................... 20V Specified Temperature Range ................ 40C to 85C Differential Input Voltage ....................................... 40V Maximum Junction Temperature ......................... 150C Input Current ....................................................... 20mA Storage Temperature Range ................ 65C to 150C Output Short-Circuit Duration ......................... Indefinite Lead Temperature (Soldering, 10 sec).................. 300C Operating Temperature Range ............... 40C to 85C PACKAGE/ORDER INFORMATION ORDER PART ORDER PART TOP VIEW TOP VIEW NUMBER NUMBER 14 OUT A 1 OUT D + OUT A 1 8 V 13 LT1463CN LT1462ACN8 IN A 2 IN D A D IN A 2 7 OUT B A 12 LT1463CS LT1462ACS8 +IN A 3 +IN D +IN B 3 6 IN B + 11 B LT1462CN8 V 4 V V 4 5 +IN B 10 LT1462CS8 +IN B 5 +IN C B C 9 N8 PACKAGE S8 PACKAGE IN B 6 IN C 8-LEAD PDIP 8-LEAD PLASTIC SO S8 PART MARKING OUT B 7 8 OUT C 1462 N PACKAGE S PACKAGE T = 150C, = 130C/ W (N) JMAX JA 14-LEAD PDIP 14-LEAD PLASTIC SO T = 150C, = 190C/ W (S) JMAX JA 1462A T = 150C, = 110C/ W (N) JMAX JA T = 150C, = 150C/ W (S) JMAX JA Consult factory for Industrial and Military grade parts. V = 15V, V = 0V, T = 25C, unless otherwise noted. ELECTRICAL CHARACTERISTICS S CM A LT1462AC LT1462C/LT1463C SYMBOL PARAMETER CONDITIONS (Note 1) MIN TYP MAX MIN TYP MAX UNITS V Input Offset Voltage V = 5V 0.4 0.8 0.4 0.8 mV OS S V = 15V 0.6 2.0 0.6 2.0 mV S I Input Offset Current V = 5V 0.3 1.2 pA OS S V = 15V 0.5 2.0 0.5 15 pA S I Input Bias Current V = 5V 0.5 2.0 pA B S V = 15V 1 3.0 1 20 pA S e Input Noise Voltage 0.1Hz to 10Hz 2 2 V n P-P Input Noise Voltage Density f = 10Hz 92 92 nV/Hz O f = 1000Hz 76 76 nV/Hz O Input Noise Current Density f = 10Hz, 1kHz (Note 3) 0.5 0.5 fA/Hz O CMRR Common Mode Rejection Ratio V = 12.5V to 15V 76 89 74 89 dB CM PSRR Power Supply Rejection Ratio V = 2.5V to 20V 81 90 78 90 dB S 12 12 R Input ResistanceDifferential 10 10 IN 12 12 Common Mode V = 12.5V to 8V 10 10 CM 11 11 Common Mode V = 8V to 15V 10 10 CM C Input Capacitance 3 3 pF IN A Large-Signal Voltage Gain V = 10V, R = 10k 100 600 100 600 V/mV VOL O L V = 5V, V = 2V, R = 10k 50 200 50 200 V/mV S O L 2 U W U W U WW