LT1122

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Fast Settling, JFET Input

Operational Amplifier

The LT®1122 JFET input operational amplifier combines

high speed and precision performance.

A unique poly-gate JFET process minimizes gate series

resistance and gate-to-drain capacitance, facilitating wide

bandwidth performance, without degrading JFET transis-

tor matching.

It slews at 80V/µs and settles in 340ns. The LT1122 is

internally compensated to be unity-gain stable, yet it has

a bandwidth of 14MHz at a supply current of only 7mA. Its

speed makes the LT1122 an ideal choice for fast settling

12-bit data conversion and acquisition systems.

The LT1122 offset voltage of 120µV, and voltage gain of

500,000 also support the 12-bit accurate applications.

The input bias current of 10pA and offset current of 4pA

combined with its speed allow the LT1122 to be used in

such applications as high speed sample and hold ampli-

fiers, peak detectors, and integrators.

12-Bit Voltage Output D/A Converter

Large-Scale Response

APPLICATIONS

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100% Tested Settling Time

340ns Typ

to 1mV at Sum Node, 10V Step

540ns Max

Tested with Fixed Feedback Capacitor

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Slew Rate

60V/µs Min

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Gain-Bandwidth Product

14MHz

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1.2 MHz

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Unity-Gain Stable; Phase Margin

60°

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Input Offset Voltage

600µV Max

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Input Bias Current

25°C

75pA Max

70°C

600pA Max

■

Input Offset Current

25°C

40pA Max

70°C

150pA Max

■

Low Distortion

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Fast 12-Bit D/A Output Amplifiers

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High Speed Buffers

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Fast Sample-and-Hold Amplifiers

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High Speed Integrators

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Voltage to Frequency Converters

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Active Filters

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Log Amplifiers

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Peak Detectors

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and C-Load

is a trademark of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

0mA TO 2mA

OR 4mA

2

3

6

CF

V

0V TO 10V

OUT

12-BIT CURRENT OUTPUT D/A CONVERTER

(DEPENDING ON D/A CONVERTER USED)

+

–

LT1122

LT1122•TA01

+

200ns/DIV

1122 TA07