AD684JQ

Instrumentation, Op Amps, Buffer Amps Overview

The AD684JQ is a monolithic quad sample-and-hold amplifier manufactured by Analog Devices Inc. It features four independent sampling channels with internal hold capacitors, requiring no external components. The device utilizes a BiMOS process for high performance and low power. Key electrical parameters include a maximum acquisition time of 1 μs to 0.01% accuracy, a typical hold mode settling time of 500 ns, and a low droop rate of 0.01 μV/μs. It operates within a temperature range of 0°C to +70°C and is housed in a 16-lead Cerdip package.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Monolithic construction ensures excellent interchannel matching for timing and accuracy.
• Self-correcting architecture minimizes hold mode errors and compensates for charge injection.
• Independent inputs, outputs, and control pins provide system architecture flexibility.
• Internal hold capacitors eliminate the need for external adjustments or components.

Instrumentation, Op Amps, Buffer Amps Applications

• High-performance multichannel data acquisition systems
• Driving high-speed analog-to-digital converters such as the AD578, AD674, AD7572, and AD7672
• Front-end conditioning for 12-bit and 14-bit ADCs

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific grade suffix J corresponds to the required commercial temperature range of 0°C to +70°C. Confirm that the 16-lead Cerdip package aligns with the target PCB footprint and mounting requirements. Ensure supply voltage rails match the specified ±12 V nominal operation for optimal performance metrics.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when multiple independent sampling channels are required on a single die. The AD684JQ is suitable for applications demanding fast acquisition times under 1 μs and low aperture jitter. Consider the self-contained nature of the SHA channels if minimizing external component count is a priority for the design.

Instrumentation, Op Amps, Buffer Amps Part Context

The AD684 series includes grades A and S for extended temperature ranges, while the J grade covers commercial limits. All variants share the same monolithic quad SHA architecture and pinout. The Q suffix denotes the 16-lead Cerdip package option available across the product line.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.

Instrumentation, Op Amps, Buffer Amps FAQ

Does the AD684 require external hold capacitors?

No, the AD684 contains internal hold capacitors and is completely self-contained without requiring external components or adjustments.

What is the maximum aperture jitter specification?

The maximum aperture jitter is specified as 75 ps across all temperature grades.

How does the self-correcting architecture function?

It corrects for internal errors after the hold command by compensating for amplifier gain and offset errors, as well as charge injection errors.