AD7732BRUZ-REEL7

Overview

The AD7732BRUZ-REEL7 is a high precision, high throughput analog front end featuring a 24-bit Sigma-Delta ADC with two fully differential analog inputs. It supports input ranges of ±10 V, +10 V, ±5 V, and +5 V while operating from a single +5 V analog supply and a 3 V or 5 V digital supply. The device offers up to 15.4 kHz data throughput and includes on-chip per-channel system calibration. It features overvoltage tolerance up to ±16.5 V without degrading adjacent channel performance and utilizes a 3-wire serial interface compatible with microcontrollers.

Feature Summary

• Features two fully differential analog input channels with configurable unipolar or true bipolar input ranges.
• Includes overrange and underrange detection capabilities along with 'No-Reference' detect functionality for the differential reference input.
• Supports per-channel system calibration options to optimize noise performance against data throughput.
• Digital serial interface inputs are Schmitt triggered and compatible with standard microcontroller and DSP protocols.

Applications

• PLCs/DCS
• Multiplexing applications
• Process control
• Industrial instrumentation

Procurement Notes

Verify the specific ordering suffix REEL7 indicates tape and reel packaging when sourcing components. Confirm that the B-grade temperature range (–40°C to +105°C) aligns with your operational requirements. Ensure the external master clock frequency matches the specified 1 to 6.144 MHz range for optimal performance.

Selection Notes

Select this component for applications requiring high-resolution multiplexing with fast channel switching times. Consider the AD7734 if four single-ended inputs are needed, or the AD7738 for configurable differential/single-ended inputs with lower voltage ranges. Verify power supply constraints, as the analog supply is fixed at 5 V while the digital supply allows flexibility between 3 V and 5 V.

Part Context

The AD7732 belongs to the Analog Devices AD773x family of high-performance analog front ends. It is functionally similar to the AD7734, which provides four single-ended channels, and the AD7738, which offers configurable input topologies. These devices share common architectural features such as Sigma-Delta conversion and on-chip calibration circuits designed for industrial signal conditioning.

Replacement Considerations

Public confirmed substitute part numbers: AD7734BRUZ-REEL7, AD7738BRUZ-REEL7.

FAQ

What is the maximum overvoltage the analog inputs can tolerate?

The analog inputs are tolerant up to ±16.5 V without degrading the performance of adjacent channels, with an absolute maximum rating of ±50 V.

How does the chopping mode affect performance?

Enabling chopping provides very low noise and lower offset drift but reduces the maximum output data rate. Disabling chopping allows for faster conversion times while maintaining high resolution.

Is an external reference required?

Yes, the AD7732 requires an external differential reference voltage applied to the REFIN(+) and REFIN(–) pins.