AD7822BRZ

Overview

The AD7822BRZ is an 8-bit, single-channel analog-to-digital converter (ADC) from the AD7822/AD7825/AD7829 family. It features a maximum throughput of 2 MSPS and utilizes a half-flash architecture with a conversion time of 420 ns. The device includes an on-chip track-and-hold amplifier and a 2.5 V reference voltage. It operates on a single supply of 3 V ± 10% or 5 V ± 10%, consuming 24 mW typically in normal operation. Key specifications include a Signal-to-Noise Ratio of 48 dB min, INL/DNL of ±0.75 LSB max, and a flexible parallel interface with an End-of-Conversion pulse.

Feature Summary

• Half-flash ADC architecture providing fast 420 ns conversion times for real-time processing.
• On-chip track-and-hold amplifier capable of handling full-scale input signals up to 10 MHz.
• Integrated 2.5 V reference voltage simplifies external circuit design requirements.
• Automatic power-down mode at the end of conversion to minimize power consumption.

Applications

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

Procurement Notes

Verify the specific ordering suffix BRZ against the manufacturer's current datasheet to confirm package type and RoHS compliance status. Ensure that the component source provides valid traceability documentation. Cross-reference the part number with official Analog Devices catalogs to confirm availability and revision level before finalizing procurement plans.

Selection Notes

Select this component when a single-ended, high-speed 8-bit conversion is required with minimal external support circuitry. The integrated reference and track-and-hold make it suitable for applications where board space is limited. Verify that the system logic levels are compatible with the specified 3 V or 5 V operating voltages and that the parallel interface timing meets the microprocessor requirements.

Part Context

The AD7822BRZ belongs to the AD7822/AD7825/AD7829 series of sampling ADCs. While the AD7822 offers one channel, the AD7825 provides 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 channel count and pin configuration.

Replacement Considerations

Direct functional replacements within the same family include the AD7825BRZ for multi-channel needs or the AD7829BRZ for higher channel density. Other variants such as AD7822BNZ may offer different packaging options while maintaining electrical equivalence. Verify pin compatibility and thermal characteristics when substituting.