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16-bit octal SPI DAC achieves ±4LSB INL (Max)

Milpitas, Calif.—Linear Technology Corp. has introduced the LTC2656, a 16-bit octal digital-to-analog converter (DAC) that it says offers ±4LSB INL maximum over temperature, a factor of three times better than the nearest octal competitor.

The combination of low 0.1% (max) gain error and low ±2mV (max) offset error ensure that LTC2656 remains accurate near the supply rails and provides the user with a wider effective output range. The LTC2656's precision specifications make it suitable for multi-channel 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 reference that achieves 2ppm/°C typical and 10ppm/°C maximum temperature coefficient. By integrating the reference in its tiny 20-pin 4mm x 5mm QFN and TSSOP packages, the LTC2656 offers further space reduction for densely packed circuit boards. Operating from a single 2.7V to 5.5V supply, supply current is a low 375µA per DAC with the reference activated. The LTC2656 offers 8.5µs settling time for a half-scale step and <1nVs crosstalk, resulting in minimal disturbance between DAC channels. The LTC2656 communicates via a 4-wire SPI-compatible interface up to 50MHz.

The LTC2656 offers a wide range of options to meet application specific requirements. 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.

The LTC2656 is available, along with the LTC2657, an I²C-compatible 16-bit octal DAC. The LTC2656 16-bit and 12-bit DACs and demo boards are now available.

Pricing: Begins at $8.95 each for the 12-bit options and $17.95 each for the 16-bit options in 1,000-piece quantities.
Availability: The LTC2657 samples will be available in July, with production volumes scheduled for September 2009.

Datasheet: click here.

Linear Technology, www.linear.com

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