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DAC features six software-programmable output ranges

Posted: 17 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:DAC? software programmable? output ranges?

Linear Technology Crop. has introduced the LTC2753-16, a dual 16bit current output DAC capable of outputting six unique software-programmable SoftSpan unipolar and bipolar output ranges up to 10V. Software programmability eliminates the need for expensive precision resistors, gain stages and switching jumpers by hand.

The LTC2753-16 promises accurate DC specifications, including 1LSB (max) INL and DNL over the -40C to 85C industrial temperature range. Operating from a single 2.7-5.5V supply, this DAC draws a maximum supply current of only 1?A. The six unique SoftSpan output voltage ranges include two unipolar ranges (0-5V, 0-10V) and four bipolar ranges (10-, 5-, 2.5V, -2.5V to 7.5V). With its software programmability, low power and precision DC specifications, the LTC2753-16 is suitable for ATE DAQ modules such as PC/104.

The LTC2753-16 also offers very good AC specifications, including full-scale settling time of only 2?s and low 1nV?s glitch impulse. The LTC2753-16's good AC specifications are key for applications such as waveform generation. Low glitch reduces the transient voltages between code changes in the DAC. Fast settling and low glitch reduce the harmonic distortion, making it possible to produce higher frequency, lower noise output waveforms. The LTC2753-16 uses a bidirectional input/output parallel interface that allows readback of any internal register, as well as the DAC output span setting.

The LTC2753-14 and LTC2753-12 are pin-compatible 14bit and 12bit devices, respectively. The LTC2753-16, LTC2753-14 and LTC2753-12 are all available in 7mm x 7mm QFN-48 packages, offering a pin-compatible and code-compatible family for performance/cost optimization in the end product. For applications only requiring a single DAC, please refer to the LTC2751 16-/14-/12bit DAC family. Both the dual LTC2753 and single LTC2751 DAC families are available today in commercial and industrial temperature ranges. Pricing begins at $5.95 each for the LTC2753-12, in 1,000-piece quantities.

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