AD7822BR

Overview

The AD7822BR is an 8-bit, single-channel analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a maximum throughput of 2 MSPS and utilizes a half-flash architecture with a conversion time of 420 ns. The device operates on a single supply voltage ranging from 3 V ± 10% to 5 V ± 10%. Key electrical specifications include a signal-to-noise ratio of 48 dB minimum, integral nonlinearity of ±0.75 LSB, and differential nonlinearity of ±0.75 LSB. It incorporates an on-chip 2.5 V reference, a track-and-hold amplifier, and a flexible parallel interface with an end-of-conversion pulse.

Feature Summary

• Integrates a high-speed parallel interface with an end-of-conversion pulse for standalone microprocessor operation.
• Features an on-chip track-and-hold amplifier capable of handling full-scale input signals up to 10 MHz.
• Includes an internal 2.5 V reference voltage source to simplify external circuit design.
• Supports automatic power-down at the end of conversion to minimize energy consumption.

Applications

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

Procurement Notes

Verify the specific package variant against the ordering guide, as the BR suffix typically denotes a SOIC package. Confirm that the required channel count matches the single-channel specification of the AD7822 series. Ensure the operating environment falls within the specified industrial temperature range of -40°C to +85°C. Check for RoHS compliance status in the latest manufacturer documentation before finalizing procurement.

Selection Notes

Select the AD7822BR when a single-ended analog input channel is sufficient for the application. Consider this component if the system requires a fast 420 ns conversion time and a parallel data bus interface. Evaluate the need for the integrated 2.5 V reference versus an external precision reference based on cost and accuracy requirements. Verify that the available supply voltage aligns with the 3 V or 5 V operational ranges.

Part Context

The AD7822BR belongs to the AD7822/AD7825/AD7829 family of sampling ADCs. While the AD7822 provides one channel, the AD7825 offers four channels and the AD7829 provides eight channels. All variants share identical core performance characteristics, including the 2 MSPS throughput and half-flash architecture, differing primarily in the number of analog input pins and package lead counts.

Replacement Considerations

Publicly confirmed substitute part numbers are not identified in the provided documentation. Designers requiring alternative sources should consult official distributor catalogs for cross-reference lists or verify pin-compatible alternatives through independent technical validation.