AD7725BS

Overview

The AD7725BS is a 16-bit analog-to-digital converter featuring an on-chip programmable postprocessor. It supports a maximum master clock frequency of 14.4 MHz and delivers output word rates up to 900 kSPS with input bandwidths reaching 350 kHz. The device operates on 5 V supplies (AVDD, DVDD) within a –40°C to +85°C range. Key electrical parameters include a typical Signal-to-Noise Ratio of 83 dB in unipolar mode and ±2 LSB Integral Nonlinearity. It utilizes a 44-lead MQFP package and includes an internal 2.5 V reference.

Feature Summary

• Features a fully user-programmable postprocessor capable of up to 130 million MACs per second for custom signal conditioning.
• Supports flexible programming modes allowing boot from DSP or external EPROM via parallel or serial interfaces.
• Integrates an accurate on-chip 2.5 V voltage reference with the option to utilize an external system reference.

Applications

• Radar systems
• Sonar applications
• Medical communications equipment

Procurement Notes

Verify the specific suffix 'BS' corresponds to the Metric Quad Flat Package (MQFP) variant with the specified temperature range. Confirm interface requirements match the parallel or serial capabilities defined in the datasheet. Ensure power supply decoupling meets the recommended specifications for the internal reference and modulator sections to maintain performance integrity.

Selection Notes

Select this component when high-resolution 16-bit conversion requires customizable digital filtering beyond standard fixed filters. The programmable postprocessor allows optimization for specific signal characteristics using Filter Wizard software. Consider the 44-lead MQFP footprint and 5 V supply constraints during system design. Verify that the required output data rate fits within the 900 kSPS limit relative to the input clock frequency.

Part Context

The AD7725 belongs to Analog Devices' family of complete ADC solutions with integrated signal processing. It distinguishes itself by combining a sigma-delta modulator with a reconfigurable digital filter engine. This architecture enables designers to implement complex FIR and IIR filters directly on-chip, reducing reliance on external digital signal processors for initial signal conditioning stages.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.