AD7738BRUZ

Overview

The AD7738BRUZ is an 8-channel, high throughput, 24-bit Sigma-Delta analog-to-digital converter (ADC) from Analog Devices Inc. It features a configurable analog front end supporting eight single-ended or four fully differential input channels with unipolar or bipolar ranges of ±625 mV, ±1.25 V, and ±2.5 V. The device operates on a single 5 V analog supply and a 3 V or 5 V digital supply. It provides true 16-bit peak-to-peak resolution at 8.5 kHz channel switching speeds and up to 15.4 kHz data throughput. Integral nonlinearity is specified at ±0.0015% of full scale range. The component is housed in a 28-lead TSSOP package and supports operation over the extended industrial temperature range of –40°C to +105°C.

Feature Summary

• Configurable analog front end with external multiplexer output for programmable gain or signal conditioning
• On-chip per-channel system calibration capabilities to reduce offset and gain errors
• Differential reference input featuring 'No-Reference' detect capability
• Schmitt-triggered logic inputs compatible with SPI, QSPI, Microwire, and DSP interfaces

Applications

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

Procurement Notes

Verify the specific ordering suffix RU-28 corresponds to the 28-lead TSSOP package variant. Confirm that the BRUZ designation aligns with the required extended industrial temperature range specifications (-40°C to +105°C). Ensure compatibility with the intended serial interface protocol before finalizing procurement.

Selection Notes

Select this component when high-resolution multiplexing across multiple channels is required. Consider the trade-off between noise performance and data throughput by adjusting the conversion time register settings. Verify that the common-mode input voltage requirements fit within the specified limits relative to the analog ground and supply rails.

Part Context

The AD7738 belongs to the AD7738 family of high-precision analog front ends. Related parts include the AD7734, which features four single-ended channels with higher voltage tolerance, and the AD7732, which offers two fully differential channels. These variants share similar core ADC architectures but differ in channel count and input configurations.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.