Date: 02/07/2009

Linear's 16-bit octal DAC with voltage reference

Linear Technology has introduced LTC2656, a 16-bit octal digital-to-analog converter (DAC) with ±4LSB INL maximum over temperature. This device also features a low 0.1% (max) gain error and low ±2mV (max) offset error. The LTC2656 is suggested for multichannel open loop and closed loop systems typically found in communication systems, industrial process control, automated test equipment (ATE) and programmable logic controllers.

The LTC2656 integrates a precision voltage reference with 2ppm/°C typical and 10ppm/°C maximum temperature coefficient. The supply voltage range is 2.7V to 5.5V and consumes a supply current of 375uA per DAC with the reference activated. When it comes AC performance, this DAC feature 8.5us settling time for a half-scale step and <1nVos crosstalk. The LTC2656 communicates via a 4-wire SPI-compatible interface up to 50MHz.

The LTC2656 offers multiple selection options; designers can choose between 16-bit or 12-bit resolution and an internal 1.25V or 2.048V reference, which produce a full-scale output voltage of 2.5V or 4.096V. Alternatively, an external reference up to half the supply voltage can be for rail-to-rail operation. The LTC2656 also includes a hardware option to power up the DAC outputs at zero-scale or midscale.

For more information, visit www.linear.com