AD7725BS-REEL

Overview

The AD7725BS-REEL is a 16-bit, 900 kSPS analog-to-digital converter featuring a user-programmable postprocessor. It operates on a single +5 V supply with an internal 2.5 V reference and supports ±4 V differential or 0 to +4 V single-ended inputs. The device utilizes a 44-lead MQFP package and functions within a –40°C to +85°C temperature range. Key specifications include a maximum master clock frequency of 14.4 MHz, up to 108-tap FIR/IIR filtering capabilities, and a postprocessor performance of 130 million MACs per second.

Feature Summary

• Programmable digital signal conditioning via a high-performance postprocessor supporting complex filter configurations.
• Flexible interface options including parallel data bus and multiple serial communication modes for configuration and data retrieval.
• Integrated on-chip voltage reference with the capability to utilize external reference sources for system flexibility.

Applications

• Radar systems requiring high-speed precision sampling
• Sonar signal processing applications
• Medical communications equipment
• Auxiliary automotive functions

Procurement Notes

Verify the specific suffix REEL indicates tape-and-reel packaging when sourcing components. Confirm that the BS variant meets the required industrial temperature range specifications for your deployment environment. Ensure compatibility with existing board layouts regarding the 44-lead MQFP footprint before procurement.

Selection Notes

Select this component when application requirements demand both high-speed conversion and customizable digital filtering within a single integrated circuit. Consider the power consumption implications of the programmable postprocessor and verify that the available clock frequencies align with the desired output data rates and input bandwidth constraints.

Part Context

This part belongs to the AD7725 family of high-speed ADCs from Analog Devices. The BS designation identifies the industrial temperature grade version housed in the Metric Quad Flat Package. The REEL suffix specifies the bulk packaging format intended for automated surface-mount assembly processes.

Replacement Considerations

No direct public substitute part numbers are documented in the provided datasheet. Designers should evaluate other high-speed ADCs with programmable digital filters if replacement is necessary due to obsolescence or supply constraints.

FAQ

How is the analog input range configured?

The UNI pin selects the analog input range; a logic low enables bipolar operation (differential or single-ended), while a logic high enables unipolar operation (single-ended).

What is the function of the postprocessor?

The postprocessor provides up to 130 million MACs per second, allowing users to program filter coefficients, decimation ratios, and signal conditioning characteristics via a configuration file.

Can the device operate with an external clock?

Yes, by tying the XTALOFF pin high, an external clock source can be applied directly to the CLKIN pin, disabling the internal crystal oscillator amplifier.