AD872AJD

Overview

The AD872AJD is a monolithic 12-bit, 10 MSPS analog-to-digital converter featuring an on-chip track-and-hold amplifier and voltage reference. It utilizes a multistage differential pipelined architecture with error correction logic to ensure no missing codes across the operating temperature range. The device operates on +5V analog and digital supplies with a -5V analog supply, consuming approximately 1.03 W of power. It provides a two's complement binary output format and includes an out-of-range indicator. The component is housed in a 28-lead ceramic DIP package and supports input frequencies up to 35 MHz.

Feature Summary

• Monolithic integration of a high-performance track-and-hold amplifier and internal voltage reference eliminates the need for external buffering components.
• Multistage differential pipelined architecture with error correction logic ensures 12-bit accuracy and guarantees no missing codes over the full operating temperature range.
• Low noise input stage with high impedance allows direct interfacing with multiplexed systems and single-channel inputs without degradation.

Applications

• High-end imaging systems requiring low noise and high dynamic performance
• Multiplexed data acquisition systems switching multiple signals through a single converter
• Video applications utilizing undersampling techniques beyond the Nyquist rate

Procurement Notes

Verify component authenticity as this part is classified as obsolete by the manufacturer. Confirm that the specific J grade variant meets the required 0 °C to +70 °C operating temperature range. Ensure that the 28-lead ceramic DIP package form factor remains compatible with existing board layouts and socket requirements before finalizing procurement decisions.

Selection Notes

Select the AD872AJD when a complete 12-bit solution at 10 MSPS is required with minimal external support circuitry. This model is suitable for designs needing pin compatibility with the original AD872 while offering improved noise characteristics. Consider the 1.03 W power dissipation and three-clock-cycle pipeline latency during system timing analysis.

Part Context

The AD872A represents a redesigned version of the AD872 optimized for lower noise using Analog Devices' ABCMOS process. It maintains pin compatibility with the original AD872, allowing for interchangeable use in existing systems. The device integrates bipolar and CMOS transistors on a single chip to achieve high-speed conversion capabilities within a compact monolithic structure.

Replacement Considerations

The AD872AJD is pin-compatible with the AD872. Designers may substitute the original AD872 if system requirements allow for the noise specifications of the earlier generation component.