Linear Technology introduces the LTC2758, a dual, 18-bit, current output digital-to-analog converter. The LTC2758 offers 18-bit DC specifications, including ±1LSB (max) INL and DNL over temperature. In addition the LTC2758 offers settling of 2.1µs and 0.4nV•s (3V), 2nV•s (5V) glitch impulse.

The LTC2758’s SoftSpan feature is capable of outputting six unique unipolar and bipolar output ranges up to ±10V. The output voltage ranges include two unipolar ranges (0V to 5V, 0V to 10V) and four bipolar ranges (±10V, ±5V, ±2.5V, -2.5V to +7.5V) that can be selected using software or pin-strapping. The LTC2758 also integrates precision resistors for each DAC for reference inversion, bipolar offset and gain and offset adjustment.

The LTC2758 communicates via a 3-wire bidirectional input/output SPI serial interface that enables readback of any internal register, as well as the DAC output span setting. Voltage-controlled offset and gain adjustment pins enable users to null system offset, gain error, or reference errors.

The DC1684A is the associated demonstration board to evaluate the LTC2758 and LTC2752. The DAC is available today in a 7mm x 7mm LQFP-48 package.