LT1122DCJ8

Instrumentation, Op Amps, Buffer Amps Overview

The LT1122DCJ8#PBF is a fast settling, JFET input operational amplifier manufactured by Analog Devices. It features a gain-bandwidth product of 14 MHz and a slew rate of 80 V/µs. The device operates on supply voltages ranging from ±5 V to ±20 V with a typical supply current of 7.5 mA. Key electrical specifications include an input offset voltage of 600 µV maximum, an input bias current of 75 pA maximum at 25°C, and a common-mode rejection ratio of 99 dB. It is housed in an 8-lead hermetic DIP (J8) package and supports an operating temperature range of -40°C to 85°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Combines high speed and precision performance using a unique poly-gate JFET process that minimizes gate series resistance and capacitance.
• Internally compensated for unity-gain stability while maintaining wide bandwidth suitable for fast settling applications.
• Features low distortion and high large-signal voltage gain to support accurate data conversion systems.

Instrumentation, Op Amps, Buffer Amps Applications

• Fast settling 12-bit D/A output amplifiers
• High-speed sample-and-hold amplifiers
• Peak detectors and integrators
• Voltage-to-frequency converters

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific grade suffix (C or D) and package type (J8) against the required electrical tolerances and environmental ratings. Confirm lead-free finish compliance if RoHS standards are mandatory for the assembly process. Check for obsolete status notifications as some variants may be discontinued. Ensure the supplier provides valid traceability documentation for hermetic packages.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when both high slew rate and low input bias current are critical requirements. The J8 package is suitable for environments requiring hermetic sealing. Consider the speed boost terminal if higher bandwidth is needed, noting the trade-off in phase margin. Evaluate power supply decoupling needs carefully due to the high-speed nature of the amplifier.

Instrumentation, Op Amps, Buffer Amps Part Context

The LT1122 belongs to the Linear Technology family of fast-settling operational amplifiers designed for precision analog signal processing. It bridges the gap between general-purpose JFET op amps and high-speed video amplifiers. The DCJ8 variant specifically denotes the commercial temperature range within the hermetic ceramic dual in-line package lineup.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

LT1122CS8#PBF

Instrumentation, Op Amps, Buffer Amps FAQ

What is the function of Pin 8?

Pin 8 is the Speed Boost/Overcompensation terminal. Shorting it to the positive supply increases slew rate and bandwidth by approximately 25% but reduces phase margin.

Is the LT1122 unity-gain stable?

Yes, the LT1122 is internally compensated to be unity-gain stable with a typical phase margin of 60 degrees.