AD7829BRZ-REEL7

Overview

The AD7829BRZ-REEL7 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 36 mW in normal operation and 5 μA in power-down mode. The device integrates a 2.5 V reference, a track-and-hold amplifier, and a flexible parallel interface. Key performance metrics include ±0.75 LSB INL/DNL, ±2 LSB gain error, and a signal-to-noise ratio of 48 dB min at 30 kHz input frequency.

Feature Summary

• Integrates an on-chip 2.5 V reference and a high-speed track-and-hold amplifier capable of handling full-scale inputs up to 10 MHz.
• Features automatic power-down functionality triggered by the CONVST pin state at the end of conversion to minimize power consumption.
• Provides flexible parallel interfacing with an End-of-Conversion (EOC) pulse for standalone microprocessor or DSP operation.
• Includes an input offset adjustment via the VMID pin to center the analog input span within the supply range.

Applications

• Data acquisition systems
• DSP front ends
• Disk drives
• Mobile communication systems

Procurement Notes

Verify the specific ordering suffix REEL7 confirms tape-and-reel packaging when sourcing components. Confirm that the BR designation indicates the industrial temperature range of -40°C to +85°C. Ensure compatibility with the required 3 V or 5 V supply rails and check for RoHS compliance status as per the manufacturer's current documentation before finalizing procurement.

Selection Notes

Select this component for applications requiring multi-channel sampling at speeds up to 2 MSPS with moderate 8-bit resolution. Consider the integrated reference and track-and-hold features if board space is limited. Verify that the parallel interface logic levels match the host microprocessor or DSP capabilities. Evaluate the power-down requirements against system duty cycles to leverage the low standby current.

Part Context

This part belongs to the AD7822/AD7825/AD7829 family of high-speed sampling ADCs. While the AD7822 offers one channel and the AD7825 offers four channels, the AD7829 specifically provides eight single-ended analog input channels. All variants share identical core specifications regarding conversion speed, resolution, and power characteristics, differing primarily in channel count and package pinout.

Replacement Considerations

The AD7829BRUZ-1 is documented as a parameter-equivalent alternative within the same product family. Verify pin compatibility and electrical specifications against the original datasheet before substitution.