AD7822BRZ-REEL7

Overview

The AD7822BRZ-REEL7 is an 8-bit, single-channel analog-to-digital converter with a maximum throughput of 2 MSPS. It features a half-flash architecture with a 420 ns conversion time and an on-chip track-and-hold amplifier. The device operates from a single 3 V ± 10% or 5 V ± 10% supply, supporting input voltage spans of 0 V to 2 V (VDD = 3 V) or 0 V to 2.5 V (VDD = 5 V). It includes a 2.5 V internal reference with ±2% tolerance and utilizes a flexible parallel interface with an end-of-conversion pulse for standalone operation.

Feature Summary

• Integrates an on-chip 2.5 V reference and track-and-hold amplifier for simplified system design.
• Features automatic power-down at the end of conversion to minimize power consumption.
• Offers adjustable analog input span via the VMID pin to accommodate various signal ranges.

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 AD7822 series is available in multiple packages including SOIC and TSSOP. Confirm that the REEL7 suffix corresponds to the required tape and reel quantity for your manufacturing process. Ensure compatibility with existing microprocessor interfaces regarding logic levels and timing constraints.

Selection Notes

Select this component when a single-channel, high-speed 8-bit conversion is required with minimal external components. The integrated reference and track-and-hold reduce board space. Consider the AD7825 or AD7829 if multiple input channels are needed instead of the single-channel AD7822.

Part Context

This part belongs to the AD7822/AD7825/AD7829 family of high-speed sampling ADCs. While sharing core specifications like resolution and speed, the AD7822 is distinguished by its single-ended input configuration, whereas other family members offer four or eight channels. All variants utilize the same half-flash architecture and parallel interface protocol.

Replacement Considerations

Direct functional replacements within the same family include the AD7825 (4-channel) and AD7829 (8-channel), provided channel count differences are acceptable. Verify pinout compatibility, particularly regarding address inputs and power-down pins, before substituting.