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 (±10 V, ±5 V, ±2.5 V, or -2.5 V to 7.5 V) or one of two unipolar output ranges (0 V to 5 V, or 0 V to 10 V). The part offers excellent dc performance of ±2 LSB (maximum) integral nonlinearity (INL) and ±1 LSB (maximum) differential nonlinearity (DNL). It operates from dual ±5 V to ±15 V analog supplies, and a 3 V to 5 V digital supply.

Article Tools

• 

The LTC2704-16 offers a reference input for each pair of DACs. These reference input voltages are inverted internally and can be driven to 7.25 V, producing output swings up to ±14.5 V. The device’s output buffers swing to within 500 mV of each power supply rail without any degradation in accuracy. The output buffers deliver accurate 10 V outputs on 12 V 10%-tolerance 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 1000 pF or current loads up to 5 mA. In addition, 0.8 μVrms output voltage noise reduces the need for output filtering. A mid-scale transition on the 0 V to 5 V output scale typically causes only a 2 nV/s glitch impulse, and a full-scale 20 V transition settles to within 1 LSB in 10 μs. The LTC2704-16 draws 4.5 mA of supply current per DAC at ±15 V and features a sleep mode that reduces supply current to 1 mA (maximum).

The LTC2704-16, LTC2704-14, and LTC2704-12 are each available in SSOP-44 packages, offering a pin-compatible and code-compatible family. 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, all in 1000-piece quantities.