Linear Technology Corporation’s LTC2308 is a 12-bit analog-to-digital converter (ADC) that measures eight single-ended input channels, four differential input channels, or combinations of both for digitizing multiple data acquisition signals with a single chip. It features an internal 8-channel multiplexer and communicates via an SPI-compatible serial interface at throughput rates up to 500 ksps. With the combination of an internal reference and a tiny 4 mm x 4 mm QFN-24 package, the LTC2308 provides a high level of integration to reduce board area and total system cost, making it suitable for portable instruments and space-constrained designs.

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It operates from a single +5 V supply, drawing only 17 mW at the 500 ksps throughput rate. Power dissipation can be further decreased with two shutdown modes. Nap mode reduces the power to 1.15 mW at 1 ksps, and sleep mode shuts down all internal circuitry and reduces the power to 35 µW. The LTC2308 measures unipolar or bipolar input signals, achieving excellent DC specifications, including ±2 mV(max) zero-scale error and ±4 LSB(max) full-scale error. Other specs include 73 dB SINAD and –88 dB THD at 1 kHz. A separate digital output supply voltage (OV_DD) allows users to configure the serial data output for power supplies ranging from 3 V to 5 V logic.

Available in both commercial and industrial temperature grades, the price for LTC2308 begins at $2.95 for 1,000-piece quantities.