AD7828BQ

Overview

The AD7828BQ is an 8-channel, 8-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It utilizes a half-flash conversion architecture 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 with frequencies up to 10 kHz and a slew rate of 157 mV/µs. Operating from a single 5 V supply, it offers a total unadjusted error of ±1 LSB and supports standard microprocessor interfaces via Chip Select (CS) and Read (RD) signals without requiring an external clock.

Feature Summary

• Half-flash conversion technique enables high-speed data acquisition without external clocking requirements.
• Integrated track-and-hold circuitry allows direct digitization of high-frequency analog inputs.
• Flexible reference input configuration supports both unipolar and bipolar signal ranges.
• Standard digital interface simplifies integration with common microprocessor architectures.

Applications

• Industrial process control systems requiring multi-channel monitoring
• Speech analysis and real-time filtering applications
• Fast infinite sample-and-hold circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm temperature range and package type. The BQ suffix indicates industrial temperature operation (-40°C to +85°C) in the Q-28 package option. Confirm availability status as legacy components may have limited production runs or obsolescence notices.

Selection Notes

Select this component for applications requiring moderate resolution with high channel count and speed. Ensure the driving source impedance is low enough to charge internal capacitors within the tracking window. Verify that the system power supply remains stable at 5 V to maintain specified accuracy levels across the operating temperature range.

Part Context

This part belongs to the AD7824/AD7828 family of high-speed multichannel ADCs. The AD7828 variant specifically provides eight multiplexed analog inputs compared to the four channels found in the AD7824 model. Both share identical conversion architectures and timing characteristics, differing primarily in channel density and pin count.

Replacement Considerations

Direct functional replacements include the AD7828KN, AD7828LN, AD7828KP, AD7828LP, AD7828CQ, AD7828BR, AD7828LRS, AD7828TQ, AD7828UQ, AD7828TE, and AD7828UE. These alternatives vary by temperature range and package style but maintain compatible electrical specifications.