26 June 2009
16bit quad SPI converter
Linear Technology's LTC2754-16 is a quad 16bit current output digital-to-analogue converter (DAC) that it says achieves ±1LSB integral nonlinearity and differential nonlinearity.
All four DACs can be software programmed or pin strapped for one of six unipolar or bipolar output ranges via a four wire serial interface. The LTC2754-16's DC specifications and SoftSpan output configurability make it suitable for multichannel data acquisition modules and automated test equipment. A pin and software compatible 12bit option is also available, designed to allow a transition between different resolutions in the end product.
According to Linear, the LTC2754-16 is capable of outputting six software programmable unipolar and bipolar output ranges up to ±10V. The six SoftSpan output voltage ranges include two unipolar ranges (0 to 5V, 0 to 10V) and four bipolar ranges (±10, ±5, ±2.5, -2.5 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 2.7 to 5.5V supply and drawing 1uA maximum supply current.
The LTC2754-16 also incorporates a full scale settling time of 2us and low glitch impulse of 0.26nV•s with a 3V supply or 1.25nV•s with a 5V supply. Its 2MHz multiplying bandwidth and AC specifications are designed for applications such as waveform generation.
The LTC2754-12 is a pin compatible 12bit device, with both 16bit and 12bit versions available in 7 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.
Author
Chris Shaw
Supporting Information
Websites
http://www.linear.com
Companies
Linear Technology (UK) Ltd
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