AD7825BN

Overview

The AD7825BN is a high-speed, microprocessor-compatible, 8-bit analog-to-digital converter featuring four single-ended analog input channels. It utilizes a half-flash architecture to achieve a maximum throughput of 2 MSPS with a conversion time of 420 ns. The device operates from a single supply voltage ranging from 3 V ± 10% to 5 V ± 10%. Key specifications include an integral nonlinearity (INL) and differential nonlinearity (DNL) of ±0.75 LSB max, a gain error of ±2 LSB max, and a signal-to-noise ratio of 48 dB min at 30 kHz input frequency. Power consumption is typically 24 mW in normal operation and drops to 5 μA in power-down mode.

Feature Summary

• Integrates a track-and-hold amplifier with full power bandwidth up to 10 MHz for subsampling applications.
• Includes an on-chip 2.5 V reference voltage to simplify external circuit design.
• Features automatic power-down at the end of conversion to minimize energy usage.
• Offers flexible parallel interface with End-of-Conversion pulse for standalone operation.

Applications

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

Procurement Notes

Verify the specific package type associated with the BN 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 required logic levels for 3 V or 5 V operation before finalizing procurement.

Selection Notes

Select this component when four-channel sampling at 2 MSPS is required within an 8-bit resolution constraint. Consider the VMID pin functionality if input offset adjustment is necessary for single-supply op amp configurations. Evaluate the half-flash architecture benefits regarding speed versus noise performance compared to SAR alternatives.

Part Context

The AD7825BN belongs to the AD7822/AD7825/AD7829 family of 3 V/5 V, 2 MSPS, 8-bit sampling ADCs manufactured by Analog Devices Inc. This series is designed for applications requiring fast conversion times and low power consumption. The BN suffix specifically denotes the PDIP package variant within this product line.

Replacement Considerations

Direct replacements within the same family include the AD7822 (1 channel) and AD7829 (8 channels). Verify pinout compatibility and channel count requirements when substituting these variants.