Dual 18-bit current output SPI DAC achieves ±1LSB INL and DNL over temperature
The combination of DC and AC accuracy in a dual DAC enables design of higher performance medical devices, instrumentation, automated test equipment, process control and industrial automation.
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 (0 V to 5 V, 0 V to 10 V) and four bipolar ranges (±10 V, ±5 V, ±2.5 V, -2.5 V to +7.5 V) 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. This eliminates the need for expensive external precision resistors and gain stages, allowing customers to improve production logistics and adjust inventory mix on the fly.
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 LTC2758 joins the previously released pin- and software-compatible 16-bit dual IOUT DAC LTC2752. The DC1684A is the associated demonstration board to evaluate the LTC2758 and LTC2752.
The LTC2758 is available today in a 7 mm x 7 mm LQFP-48 package.
For further information: www.linear.com/product/LTC2758
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