AD7828LRSZ

Overview

The AD7828LRSZ is an 8-channel, 8-bit analog-to-digital converter (ADC) from Analog Devices. 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 on a single 5 V supply and dissipates approximately 50 mW of power. The total unadjusted error for the L version is specified as ±1/2 LSB maximum. The component is housed in a 28-lead surface-mount package.

Feature Summary

• Integrates an 8-channel multiplexer with a built-in track-and-hold circuit for high-speed signal acquisition without external sampling components.
• Employs a half-flash architecture using two 4-bit flash ADCs to deliver rapid 8-bit conversion results.
• Provides a simple microprocessor interface utilizing standard Chip Select and Read signals, eliminating the need for an internal clock generation.

Applications

• Multichannel data acquisition systems requiring cost-effective space-saving solutions.
• Industrial process control applications involving multiple sensor inputs.
• Speech analysis systems utilizing real-time filtering techniques.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm temperature range and package type. The LRSZ designation indicates a commercial temperature range and surface-mount packaging. Ensure compatibility with system voltage requirements and interface timing constraints before finalizing procurement.

Selection Notes

Select this component when an 8-channel input configuration is required alongside high-speed conversion capabilities. The half-flash architecture offers a balance between speed and complexity compared to full flash or SAR alternatives. Consider the ±1/2 LSB error specification for applications demanding tight accuracy without user trimming.

Part Context

This part belongs to the AD7824/AD7828 family of high-speed multichannel ADCs. The AD7828 variant specifically provides eight analog input channels, whereas the AD7824 offers four. Both share identical conversion architectures and interface protocols, differing primarily in channel count and pinout configurations.

Replacement Considerations

Direct functional substitutes within the same family include the AD7824 for reduced channel counts. Other variants such as the AD7828LN or AD7828BR offer different error specifications or temperature ranges but maintain compatible interfaces.