AD7829BN

Overview

The AD7829BN is an 8-bit, 8-channel analog-to-digital converter (ADC) from Analog Devices Inc., featuring a half-flash architecture with a maximum throughput of 2 MSPS and a conversion time of 420 ns. It operates on a single supply voltage ranging from 2.7 V to 3.3 V or 4.5 V to 5.5 V, consuming up to 12 mA during normal operation and 5 μA in power-down mode. The device includes an on-chip 2.5 V reference, a track-and-hold amplifier with a full power bandwidth up to 10 MHz, and a flexible parallel interface with an end-of-conversion pulse for standalone microprocessor interfacing.

Feature Summary

• Half-flash ADC architecture providing fast 420 ns conversion times suitable for real-time DSP processing.
• Integrated track-and-hold amplifier capable of handling full-scale input signals up to 10 MHz for subsampling applications.
• On-chip 2.5 V reference voltage simplifies external circuit design and reduces component count.
• Automatic power-down at the end of conversion minimizes power consumption when idle.

Applications

• Data acquisition systems requiring multi-channel signal sampling
• Digital signal processor (DSP) front ends
• Disk drive control and data reading circuits
• Mobile communication systems utilizing subsampling techniques

Procurement Notes

Verify the specific package variant, as the AD7829 series is available in PDIP, SOIC, and TSSOP formats. Confirm that the BN suffix corresponds to the industrial temperature range (-40°C to +85°C). Ensure compatibility with the required supply voltage (3V or 5V) and check for any obsolete status or lifecycle notices directly from Analog Devices before finalizing procurement plans.

Selection Notes

Select the AD7829BN when eight single-ended channels are required alongside high-speed 2 MSPS performance. Consider this part if system design benefits from the automatic power-down feature to reduce average current draw. Verify that the parallel interface logic levels match the host microprocessor's voltage requirements and that the 8-bit resolution meets the application's accuracy needs.

Part Context

The AD7829 is part of the AD7822/AD7825/AD7829 family of high-speed, microprocessor-compatible ADCs. While the AD7822 offers one channel and the AD7825 offers four, the AD7829 provides eight channels within the same architectural framework. All variants share identical conversion speeds, power characteristics, and interface protocols, differing primarily in channel count and pin configuration.

Replacement Considerations

Direct parameter-equivalent replacements within the same family include the AD7822 and AD7825, though these offer fewer channels. For cross-manufacturer substitution, verify that alternative 8-bit, 2 MSPS, 8-channel ADCs match the half-flash architecture timing, parallel interface requirements, and supply voltage ranges.