Analog is Everywhere

News Release from: Analog Devices
Subject: AD7732/34/38
Edited by the Electronicstalk Editorial Team on 30 October 2002

Sigma-delta ADCs form high-throughput front ends

Building on expertise in sigma-delta technology and pushing the boundaries for speed, Analog Devices has developed a new family of 24bit sigma-delta ADCs for high-resolution multiplexing applications.

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Building on expertise in sigma-delta technology, and pushing the boundaries for speed, Analog Devices has developed a new family of 24bit sigma-delta ADCs designed for high-resolution multiplexing applications. The AD7732/34/38 are high-throughput, precision analogue front-ends offering a variety of input channel options for precision measurement applications. These are ideal for low-frequency signals in programmable logic controllers, distributed control systems, process control, and medical and industrial instrumentation applications.

The AD7732 is designed for two fully differential input channels, the AD7734 for four single-ended input channels and the AD7738 for four fully differential or eight single-ended input channels.

Key features include 0.0015% nonlinearity, programmable conversion rates up to 12kHz, under- and over-range detection capability, three-wire serial interface (SPI-, QSPI-, Microwire- and DSP-compatible), and single-supply operation (+5V analogue supply and +3 or +5V digital supply).

The AD7732 and AD7734 provide unipolar and bipolar input ranges of +/-10, +/-5, 0 to 10 and 0 to 5V, whereas the AD7738 offers input ranges of +/-2.5, +/-1.25, +/-0.625, 0 to 1.25 and 0 to 0.625V.

The AD7738 offers up to an 8kHz channel switching rate - the industry's fastest in a sigma-delta architecture.

Additionally, true 16bit peak-to-peak resolution with 500us conversion time is provided by the AD7732 and AD7734.

Prices for the AD7732/34/38 are $7.77/$7.77/$6.89 per unit, respectively, in 1000-piece quantities.

Available in 28-lead TSSOPs, the three ADCs are specified for operation over the -40 to +105C industrial temperature range.

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