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The AD7738BRUZ is a high-precision, high-throughput analogue front-end that achieves true 16-bit peak-to-peak resolution and 117 µs total conversion time (8.5 kHz channel switching), making it ideally suited for high-resolution multiplexing applications.

The AD7738BRUZ features a sigma-delta architecture with up to 24-bit lossless performance. The device can be configured via an easy-to-use digital interface to balance noise performance and data throughput to achieve conversion rates up to 15.4 kHz. The analogue front-end can be configured as eight single-ended inputs or four fully differential input channels with unipolar or bipolar 625 mV, 1.25 V and 2.5 V inputs, as well as common-mode input voltages ranging from AGND +200 mV to AVDD -300 mV. Multiplexer output pins are also provided to allow users to pre-programme gain or signal conditioning prior to inputting signals to the ADC. The differential reference voltage input has a "no reference voltage" detection function. The ADC also supports a per-channel system calibration option.

Benefits and Features

High resolution ADC:

- 24-bit lossless code

- ±0.0015% nonlinearity

Optimised for fast channel switching:

- 18-bit peak-to-peak resolution (21 active bits, 500 Hz)

- 16-bit peak-to-peak resolution (19-bit rms, 8.5 Hz)

- 15-bit peak-to-peak resolution (18-bit rms, 15 Hz)

- On-chip per-channel system calibration

Configurable inputs:

- 8 single-ended inputs or 4 fully differential inputs

Input ranges:

- +625 mV, +1.25 V, +2.5 V, ±625 mV, ±1.25 V, ±2.5 V

Three-wire serial interface:

- SPI®, QSPI™, MICROWIRE™, DSP compatible

- Schmitt trigger logic input

Single supply operation:

- 5 V analogue supply

- 3 V or 5 V digital supply

Package: 28-pin TSSOP

Applications

PLC/DCS

Multiplexing applications

Process control

Industrial Instrumentation

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