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Mixed Signal/Analog

16-Bit Quad SPI DAC Achieves ±1LSB INL & DNL with Software-Programmable Unipolar & Bipolar Outputs

4th November 2009

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Datasheet

Linear Technology has introduced the LTC2754-16, a quad 16-bit current output digital-to-analog converter (DAC) that achieves ±1LSB integral nonlinearity (INL) and differential nonlinearity (DNL). All four DACs can be software programmed or pin-strapped for one of six unipolar or bipolar output ranges via a simple 4-wire serial interface. Software programmability eliminates the need for expensive precision resistors, gain stages and manual jumpers. The LTC2754-16's precision DC specifications and flexible SoftSpan output configurability make it ideal for multichannel data acquisition modules and automated test equipment. A pin- and software-compatible 12-bit option is also available, making it easy to transition between different resolutions in the end-product.

The LTC2754-16 is capable of outputting six unique software-programmable unipolar and bipolar output ranges up to ±10V. The six SoftSpan 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). Voltage controlled offset and gain adjustment pins are also included for each DAC, making it possible to fine tune each DAC output. The LTC2754-16 outputs any of the six SoftSpan ranges while operating from a single 2.7V to 5.5V supply and drawing only 1uA maximum supply current.

The LTC2754-16 also offers very good AC specifications, including full-scale settling time of only 2us and low glitch impulse of 0.26nV•s with a 3V supply or 1.25nV•s with a 5V supply.

The LTC2754-16's 2MHz multiplying bandwidth and good AC specifications are key for applications such as waveform generation. Fast settling and low glitch reduce the harmonic distortion, making it possible to produce higher frequency, lower noise output waveforms. The LTC2754-16's serial interface operates at clock rates up to 40MHz and allows readback of any internal register, as well as the DAC output span setting.

The LTC2754-12 is a pin-compatible 12-bit device, with both 16-bit and 12-bit versions available in 7mm x 8mm QFN-52 packages. The serial LTC2754 joins a family of quad, dual and single DACs (LTC2755/LTC2753/LTC2751) that communicate via parallel I/O. The entire family is available in commercial and industrial temperature ranges.