16-Bit Quad IOUT Multiplying DAC Achieves ±1LSB INL and DNL

4th September 2008

ES Admin

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Datasheet

Linear Technology has introduced the LTC2755-16, a quad 16-bit current output digital-to-analog converter (DAC) with six software-programmable output ranges. The LTC2755-16 guarantees 16-bit linearity (±1LSB (max) INL and DNL) over the industrial temperature range without any adjustment. Each DAC output can be individually programmed through a parallel interface or can be pin-strapped for operation within a single range. A current output DAC allows end-users to customize their output amplifiers for optimal performance, depending on the requirements for better DC or AC specifications, lower noise, or higher speed. By integrating four DACs with very good linearity, the LTC2755-16 is ideal for multichannel data acquisition systems and automated test equipment.

The LTC2755-16 is 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 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). The LTC2755-16 outputs any of the six SoftSpan ranges while operating from a single 2.7V to 5.5V supply, drawing a maximum supply current of only 1uA.

The LTC2755-16 also offers very good AC specifications, including full-scale settling time of only 2us and low 1nV•s glitch impulse. The LTC2755-16’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 LTC2755-16 uses a bidirectional input/output parallel interface that allows readback of any internal register, as well as the DAC output span setting.

The LTC2755-14 and LTC2755-12 are pin-compatible 14-bit and 12-bit devices, respectively. The LTC2755 DACs are all available in 9mm x 9mm QFN-48 packages, offering a pin-compatible and code-compatible family for performance/cost optimization in the end-product. The quad LTC2755 joins the dual LTC2753 and single LTC2751, forming a complete family of precision current output DACs. The entire family is available today in commercial and industrial temperature ranges.