1

LT1462/LT1463

Dual/Quad Micropower,

260

µW C-Load Picoampere

Bias Current JFET Input Op Amps

s

Input Bias Current:

2pA Max (LT1462A)

20pA Max (LT1462, LT1463)

s

Supply Current per Amplifier: 45

s

Unity-Gain Stable for C-Load

s

Input Common Mode Range Includes Positive Rail

s

Guaranteed Specs with

±5V, ±15V Supplies

s

Gain Bandwidth Product: 175kHz Typ

s

Slew Rate: 0.13V/

µs Typ

s

Guaranteed Matching Specifications

s

Standard Pinout: SO-8, SO-14 Package

The LT

micropower op amps (45

µA 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/

µsmin)andgain

bandwidth product (125kHz min) are 100% tested. A full set

of matching specifications is also provided.

FEATURES

, LTC and LT are registered trademarks of Linear Technology Corporation.

–

+

–

+

–

+

R3

10k

C4

10

µF

R11

1M

1/4 LT1463

8

10

9

R12

10k

R10

50k

R6

100k

D3

1N4148

R7

10M

R5

24k

C5

200pF

AMP 3

1/4 LT1463

DC

OUT C3

0.47

µF

5

6

7

R3

100k

D2

1N4148

R4

10M

1/4 LT1463

1/4 LT1463

C2

200pF

R2

24k

14

12

13

2

3

4

11

1

5V

–5V

R1

100

Ω

PHOTODIODE

C1

1nF

D1

1N4148

R8

100k

Q1

2N3904

C5

1

µF

R9

1M

1462 • TA01

AC

OUT

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

Low Power Logging Amplifier

1462 • TA02

C-Load is a trademark of Linear Technology Corporation.

s

Battery-Powered Systems

s

Photocurrent Amplifiers

s

Low Frequency, Micropower Active Filters

s

Low Droop Track-and-Hold Circuits