AD7828BRZ

Overview

The AD7828BRZ is an 8-channel, 8-bit analog-to-digital converter manufactured by Analog Devices Inc. It utilizes a half-flash conversion technique to achieve a fast conversion rate of 2.5 µs per channel. The device features a built-in track-and-hold function capable of handling signals up to 10 kHz with a slew rate of 157 mV/µs. It operates from a single 5 V supply and accepts analog input voltages ranging from 0 V to 5 V. The total unadjusted error for the B version is specified as ±1/2 LSB maximum. The component is housed in a 28-lead surface-mount package and supports industrial operating temperatures from -40°C to +85°C.

Feature Summary

• Integrates an 8-channel analog multiplexer with a built-in track-and-hold circuit to eliminate the need for external sampling components.
• Employs a half-flash architecture using two 4-bit flash ADCs to provide high-speed conversion without requiring an external clock signal.
• Features a simple microprocessor interface compatible with standard Chip Select and Read signals, allowing direct connection to popular processors.

Applications

• Speech analysis systems utilizing real-time filtering
• Fast infinite sample-and-hold circuits
• Microprocessor-based data acquisition systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm temperature range and accuracy class. The BRZ designation indicates an industrial temperature grade with specific linearity specifications. Ensure compatibility with the required 28-lead surface-mount package format for your PCB design. Cross-reference the datasheet revision to confirm pinout and electrical characteristics match your system requirements.

Selection Notes

Select this component when a multichannel solution with moderate resolution and high speed is required. The AD7828 provides eight channels, whereas the AD7824 offers four channels in a similar form factor. Consider the total unadjusted error specification if system calibration is not feasible. Verify that the single 5 V supply voltage aligns with your available power rails and that the parallel digital interface matches your microprocessor capabilities.

Part Context

This part belongs to the AD7824/AD7828 family of high-speed, multichannel ADCs fabricated in an LC2MOS process. The AD7828 specifically provides eight multiplexed inputs compared to the four inputs of the AD7824. Both devices share the same half-flash conversion architecture and interface timing characteristics, differing primarily in channel count and package pin assignments.

Replacement Considerations

The AD7828CQ is a verified alternative within the same family offering identical performance but with a commercial temperature range. The AD7828LN provides the same accuracy specification with a commercial temperature rating. No direct cross-manufacturer equivalents are documented in the provided source material.