16-bit quad SPI DACs

31 March 2010 Analogue, Mixed Signal, LSI

Linear Technology’s new LTC2654 is a quad voltage output 16- and 12-bit digital-to-analog converter (DAC) family with internal reference and SPI interface. They achieve 16-bit performance of ±4 LSB INL maximum over temperature. The DACs have ±2 mV offset error and gain error of 0,1%, a combination that ensures that they remain accurate near the supply rails. Their precision specifications make them suited for multichannel, open loop and closed loop systems. Applications include mobile communication, process control and industrial automation, automated test equipment (ATE) and automotive systems.

The LTC2654’s integrated reference achieves 2 ppm/°C typical and 10 ppm/°C maximum temperature coefficient. It is offered in tiny 20-pin 4 x 4 mm QFN and 16-pin TSSOP packages. Regarding AC performance, it offers 8,9 μs settling time for a half-scale step and 3 nV·s crosstalk, resulting in minimal disturbance between DAC channels. The device operates from a single 2,7 V to 5,5 V supply and communicates via a 4-wire SPI/Microwire compatible interface up to 50 MHz.

The DAC offers a wide range of options to meet application specific requirements. Designers can choose between 16- or 12-bit resolution and an internal 1,25 V or 2,048 V reference, which produce a full-scale output voltage of 2,5 V or 4,096 V. Alternatively, an external reference up to half the supply voltage can be used for rail-to-rail operation. The LTC2654 includes a hardware option to power up the DAC outputs at zero-scale or mid-scale, allowing more flexibility for designs that cannot be forced to ground when power is first applied.

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