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Mixed Signal/Analog

16-bit quad voltage-output DAC with six software-programmable output voltage ranges.

19th May 2007

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Linear Technology has introduced the LTC2704-16, a 16-bit, quad voltage-output DAC with six software-programmable output voltage ranges. Each of the four DACs can be programmed via a 3-wire SPI-compatible serial interface for one of four bipolar output ranges (±10V, ±5V, ±2.5V, or -2.5 to 7.5V) or one of two unipolar output ranges (0V to 5V, or 0V to 10V). The LTC2704-16 offers excellent DC performance of ±2LSB(max) INL and ±1LSB(max) DNL. The LTC2704-16 operates from dual ±5V to ±15V analog supplies, and a 3V to 5V digital supply. The DAC's software-programmable SoftSpan™ output ranges and serial readback of all internal registers make it ideal for industrial and process control applications, instrumentation, and automatic test equipment.

The LTC2704-16 offers a reference input for each pair of DACs. These reference input voltages are inverted internally and can be driven to 7.25V, producing output swings up to ±14.5V. The LTC2704-16's output buffers swing to within 500mV of each power supply rail without any degradation in accuracy. The output buffers deliver accurate 10V outputs on 12V 10% industrial supplies. Each DAC includes an offset adjustment pin, a system offset buffered ground connection and a voltage feedback pin, enabling remote force and sense applications. The DAC outputs directly drive capacitive loads up to 1000pF or current loads up to 5mA. In addition, low output voltage noise (0.8uVRMS) reduces the need for output filtering. A mid-scale transition on the 0V to 5V output scale typically causes only a 2nV-sec glitch impulse, and a full-scale 20V transition settles to within 1LSB in 10us. The LTC2704-16 draws 4.5mA of supply current per DAC at ±15V and features a sleep mode that reduces supply current to 1mA(max).

The LTC2704-14 and LTC2704-12 are pin-compatible 14-bit and 12-bit devices, respectively. The LTC2704-16, LTC2704-14, and LTC2704-12 are each available in SSOP-44 packages, offering a pin-compatible and code-compatible family for performance/cost optimization in the end product. The entire family is available in commercial and industrial temperature ranges. Pricing begins at $29.95 each for the LTC2704-16, $24.95 each for the LTC2704-14, and $19.95 each for the LTC2704-12 in 1,000-piece quantities.