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LT1311

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Four Complete Current-to-Voltage Converters

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14-Lead Small Outline Package

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Accurate Gain: 20mV/

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Low Offset Error: 250nA Max

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Low Offset Drift: 2.5nA/

°C Max

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Fast Settling: 145ns to 0.1% for a 2V Step

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Wide Bandwidth: 12MHz

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Low Noise: 5pA/

√Hz

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Low Quiescent Current: 11mA Max

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Wide Supply Range:

±2V to ±18V or 4V to 36V

The LT

signed for the demanding requirements of photo diode

amplification. A new approach to current-to-voltage con-

version provides excellent DC and AC performance with-

out external DC trims or AC frequency compensation. The

LT1311 is ideal for converting multiple photo diode cur-

rents to voltages and for general purpose matched invert-

ing amplifier applications.

The LT1311 contains four current feedback amplifiers,

each with an internal 20k feedback resistor. A supply

bypass capacitor is the only external component required

to convert four signal currents to voltages. Unlike voltage

feedback-based current-to-voltage converters that oper-

ate with only a specified value of input capacitance, the

current feedback LT1311 settles cleanly with any input

capacitance up to 50pF. Only in the most demanding

applications will the LT1311 need to be mounted close to

the photo diodes.

Quad 12MHz, 145ns Settling

Precision Current-to-Voltage

Converter for Optical Disk Drives

FEATURES

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Optical Disk Drive

Photo Diode Amplifiers

Focus and Tracking Summing Amplifiers

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Color Scanners

RGB Amplifiers

Selectable Gain Amplifiers

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Matched Inverting Amplifiers

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

INPUT = 100

µA STEP

1311 TA02

1

2

3

4

5

6

7

14

13

12

10

9

8

1311 TA01

11

–

+

–

+

5V

IN A

IN B

BIAS

IN C

IN D

OUT A

OUT B

OUT C

10V

OUT D

LT1311

0.1

µF

Transient Response

Photo Diode Current-to-Voltage Converter