Datasheet LT1462, LT1463 (Analog Devices)

LT1462/LT1463 Dual/Quad Micropower, 260µW C-Load Picoampere Bias Current JFET Input Op Amps
U FEATURES DESCRIPTION
■
Input Bias Current:
The LT ®1462 (dual) and LT1463 (quad) are the first
2pA Max (LT1462A)
micropower op amps (45µA max per amp) to offer
20pA Max (LT1462, LT1463)
picoampere input bias currents (1pA typ) and unity gain ■
Supply Current per Amplifier: 45
µ
A Max
stability for capacitive loads up to 10nF. The output can ■ Unity-Gain Stable for C-LoadTM Up to 10nF swing a 10k load to within 1.5V of either supply, just like ■ Input Common Mode Range Includes Positive Rail op amps that require an order of magnitude more supply ■ Guaranteed Specs with ±5V, ±15V Supplies current. This unique combination of performance makes ■ Gain Bandwidth Product: 175kHz Typ the LT1462/LT1463 ideal over a wide range of input and ■ Slew Rate: 0.13V/µs Typ output impedances. ■ Guaranteed Matching Specifications In the design and testing of the LT1462/LT1463, particular ■ 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/µs min) and gain ■ Battery-Powered Systems bandwidth product (125kHz min) are 100% tested. A full set ■ Photocurrent Amplifiers of matching specifications is also provided. ■ Low Frequency, Micropower Active Filters , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Low Droop Track-and-Hold Circuits C-Load is a trademark of Linear Technology Corporation.
U TYPICAL APPLICATION Low Power Logging Amplifier
R8 Q1 100k 2N3904 D1 C5
Small-Signal Response, C
1N4148 1µF R9
L = 10nF
1M C1 R5 DC 1nF 24k OUT C3 5 + 0.47µF C5 AMP 3 7 R1 5V 1/4 LT1463 100Ω 2 – 200pF 6 4 – C4 R7 10 R10 1 + 10µF 1/4 LT1463 10M 50k AC 3 + 8 1/4 LT1463 D3 OUT 11 9 1N4148 – R3 –5V 10k R11 PHOTODIODE R6 1M R2 100k 24k 12 R12 1462 • TA01 + 1462 • TA02 10k AV = 1
INPUT DC OUTPUT
C2 14 1/4 LT1463 VS = ±5V, ±15V
CURRENT VOLTAGE OF AMP 3
200pF 13 CL = 10nF – 10pA –0.145V R4 100pA –0.341V 10M 1nA –0.518V 10nA –0.684V D2 100nA –0.846V 1N4148 1 µA –0.995V 10 µA –1.13V 100 µA –1.25V R3 1mA –1.37V 100k 1