Small ADC excels at power saving
06 May 2008
ADC for portable and space-constrained applications boasts 20 per cent power saving over nearest competitor.
The LTC2366, 12bit successive approximation register from Linear Technology outputs data at up to 3Msample/sec and is available in either six or eight lead TSOT-23 packages. It operates from a single 2.35V to 3.6V supply and consumes only 7.2mW at the maximum output rate.
The device is claimed to be the fastest in the company’s family of TSOT-23 pin- and software-compatible ADCs. It joins the 1Msample/sec LTC2365, the LTC2362, at 500ksample/sec. For lower speeds, the LTC2361 is guaranteed up to 250ksample/sec and the LTC2360 which is guaranteed at up to 100ksample/sec. Power is optimised for each sample rate, with the LTC2360 draws just 1.5mW at 100ksample/sec.
Power dissipation can be decreased with a shutdown mode that reduces the supply current to 2µA (maximum) to save battery life.
The 8pin package has an external reference pin and a digital output supply pin that ranges between 1V and VDD.
The ADC communicates via a serial SPI/QSPI/Microwire-compatible interface and offers no data latency and achieves DC specifications of +/-1LSB INL and +/- 1LSB DNL. The converter measures 72dB SNR, -80dB THD and 82dB SFDR at 1MHz input to digitise AC signals.
Commercial, industrial and automotive temperature ranges are available.
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