AD7825BNZ

Overview

The AD7825BNZ is a high-speed, four-channel, 8-bit analog-to-digital converter manufactured by Analog Devices Inc. It operates with a maximum throughput of 2 MSPS and utilizes a half-flash architecture to achieve a conversion time of 420 ns. The device supports single-ended inputs with an input voltage span of 2.5 V at 5 V supply or 2 V at 3 V supply. Key electrical parameters include a signal-to-noise ratio of 48 dB minimum, integral nonlinearity of ±0.75 LSB, and differential nonlinearity of ±0.75 LSB. It features an on-chip 2.5 V reference, automatic power-down, and flexible parallel interface.

Feature Summary

• Four single-ended analog input channels with selectable channel addressing via A0 and A1 pins.
• Half-flash ADC architecture providing fast 420 ns conversion times for real-time DSP processing.
• On-chip track-and-hold amplifier capable of handling full-scale input signals up to 10 MHz.
• Integrated 2.5 V reference voltage with external offset adjustment capability via the VMID pin.

Applications

• Data acquisition systems requiring multi-channel sampling
• Digital signal processor (DSP) front ends
• Disk drive control and data reading circuits
• Mobile communication systems utilizing subsampling techniques

Procurement Notes

Verify the specific package variant corresponding to the BNZ suffix against the manufacturer's current ordering guide. Confirm that the industrial temperature range (-40°C to +85°C) meets system requirements. Ensure compatibility with the intended logic voltage levels for the parallel interface before finalizing procurement.

Selection Notes

Select the AD7825BNZ when four independent single-ended channels are required within the AD782x family. Compare against the AD7822 for single-channel needs or the AD7829 for eight-channel applications. Consider the 3 V/5 V dual-supply operation and the specific parallel interface timing constraints relative to the host microprocessor.

Part Context

The AD7825BNZ belongs to the AD7822/AD7825/AD7829 series of high-speed sampling ADCs from Analog Devices. This family shares a common half-flash architecture and functional block diagram, differing primarily in the number of analog input channels available per device.

Replacement Considerations

Direct functional replacements within the same series include the AD7822 for single-channel applications and the AD7829 for eight-channel configurations. Verify pinout compatibility and interface timing specifications when substituting these variants.