AD7825BRUZ

Overview

The AD7825BRUZ is a high-speed, 4-channel, 8-bit analog-to-digital converter (ADC) from Analog Devices. It features a half-flash architecture with a maximum throughput of 2 MSPS and a conversion time of 420 ns. The device operates on a single supply voltage ranging from 3 V ± 10% to 5 V ± 10%. Key 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 flexible parallel interface logic.

Feature Summary

• Integrated 4-channel multiplexer with automatic power-down functionality controlled by the CONVST pin state at the end of conversion.
• On-chip 2.5 V reference and VMID pin for adjustable input span centering within the supply range.
• High-frequency track-and-hold amplifier supporting full-scale input signals up to 10 MHz.
• Microprocessor-compatible parallel interface allowing standalone operation via the EOC pulse.

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 BRUZ suffix denotes a TSSOP-24 package. Confirm that the required channel count matches the four-channel specification of this model. Ensure the design supports the 3 V or 5 V supply requirements and utilizes the parallel interface correctly. Check for any RoHS compliance documentation if environmental regulations apply to the target assembly process.

Selection Notes

Select this component when four independent single-ended analog inputs are required alongside high-speed digitization. The half-flash architecture provides fast conversion times suitable for real-time processing. Consider the input span adjustment capabilities if system offsets need compensation. Verify that the parallel interface timing constraints align with the host microprocessor or DSP capabilities.

Part Context

This part belongs to the AD7822/AD7825/AD7829 family of sampling ADCs. The AD7825 specifically offers four channels, distinguishing it from the single-channel AD7822 and the eight-channel AD7829. All variants share the same core half-flash architecture, 8-bit resolution, and 2 MSPS throughput capability.

Replacement Considerations

The AD7829BRUZ serves as a compatible alternative if eight channels are needed instead of four, sharing identical electrical characteristics and pinouts for the common pins. The AD7822BRUZ is suitable for single-channel applications with the same performance profile.