AD7732

PRODUCTION

2-Channel, ±10 V Input Range, High Throughput, 24-Bit Sigma-Delta ADC

Data Sheet (Rev. A) Product Selection Table
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Overview

  • High resolution ADC
    24 bits no missing codes
    ±0.0015% nonlinearity
  • 3-wire serial interface
    SPI®, QSPI™, MICROWIRE™, and DSP compatible
    Schmitt trigger on logic inputs
  • Single-supply operation
    5 V analog supply
    3 V or 5 V digital supply
  • Package: 28-lead TSSOP
  • Optimized for fast channel switching
    18-bit p-p resolution (21 bits effective) at 500 Hz
    16-bit p-p resolution (19 bits effective) at 2 kHz
    14-bit p-p resolution (18 bits effective) at 15 kHz
    On-chip per channel system calibration
  • 2 fully differential analog inputs
    Input ranges +5 V, ±5 V, +10 V, ±10 V
    Overvoltage tolerant
    Up to ±16.5 V not affecting adjacent channel
    Up to ±50 V absolute maximum

The AD7732 is a high precision, high throughput analog front end. True 16-bit peak-to-peak resolution is achievable with total conversion times of 500 µs (2 kHz channel switching) making it ideally suitable for high resolution multiplexing applications.

The part can be configured via a simple digital interface, which allows users to balance the noise performance against data throughput up to a 15.4 kHz.

The analog front end features two fully differential input channels with unipolar or true bipolar input ranges to ±10 V while operating from a single +5 V analog supply. The part has an overrange and underrange detection capability and accepts an analog input overvoltage to ±16.5 V without degrading the performance of the adjacent channels.

The differential reference input features “No-Reference” detect capability. The ADC also supports per channel system calibration options. The digital serial interface can be configured for 3-wire operation and is compatible with microcontrollers and digital signal processors. All interface inputs are Schmitt triggered. The part is specified for operation over the extended industrial temperature range of –40ºC to +105ºC and is available in 28-lead TSSOP package.

Other parts in the AD7732 family are the AD7734 and the AD7738.

The AD7734 is similar to AD7732, but its analog front end features four single-ended input channels.

The AD7738 analog front end is configurable for four fully differential or eight single-ended input channels, features 0.625 V to 2.5 V bipolar/unipolar input ranges, and accepts a common-mode input voltage from 200 mV to AVDD – 300 mV. The AD7738 multiplexer output is pinned out externally, allowing the user to implement programmable gain or signal conditioning before being applied to the ADC.

APPLICATIONS

  • PLCs/DCS
  • Multiplexing applications
  • Process control
  • Industrial instrumentation
AD7732
2-Channel, ±10 V Input Range, High Throughput, 24-Bit Sigma-Delta ADC
AD7732 Functional Block Diagram
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Documentation

Data Sheet 1

Application Note 11

Technical Articles 4

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Software Resources

Device Drivers 1

Tools & Simulations

Sigma-Delta ADC Tutorial

An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.

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Evaluation Kits

EVAL-AD7732

AD7732 Evaluation Board

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Product Details

The EVAL-AD7732EBZ is a fully featured evaluation board for the AD7732.The evaluation board can be connected to a PC via the PC COM serial port. Software is provided enabling the user to perform detailed analysis of the ADC's performance.

EVAL-AD7732
AD7732 Evaluation Board

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