1 ppm, 20-Bit, ±1 LSB INL, Voltage Output DAC

The AD57911 is a single 20-bit, unbuffered voltage-output DAC that operates from a bipolar supply of up to 33 V. The AD5791 accepts a positive reference input in the range 5 V to VDD – 2.5 V and a negative reference input in the range VSS + 2.5 V to 0 V. The AD5791 offers a relative accuracy specification of ±1 LSB max, and operation is guaranteed monotonic with a ±1 LSB differential nonlinearity (DNL) maximum specification.

The device uses a versatile 3-wire serial interface that operates at clock rates up to 35 MHz and that is compatible with standard serial peripheral interface (SPI), QSPI™, MICROWIRE™, and DSP interface standards. The device incorporates a power-on reset circuit that ensures the DAC output powers up to 0 V and in a known output impedance state and remains in this state until a valid write to the device takes place. The device provides an output clamp feature that places the output in a defined load state.

Product Highlights

* 1 ppm Accuracy.

* Wide Power Supply Range up to ±16.5 V.

* Operating Temperature Range: −40°C to +125°C.

* Low 7.5 nV/√Hz Noise Spectral Density.

* Low 0.05 ppm/°C Temperature Drift.

Applications

* Medical instrumentation

* Test and measurement

* Industrial control

* High end scientific and aerospace instrumentation

1 Protected by U.S. Patent No. 7,884,747. Other patents pending.

* 1 ppm resolution

* 1 ppm INL

* 7.5 nV/√Hz noise spectral density

* 0.19 LSB long term linearity stability

* <0.05 ppm/°C temperature drift

* 1μs settling time

* 1.4 nV-sec glitch impulse

* Operating temperature range: −40°C to +125°C

* 20-Lead TSSOP package

* Wide power supply range up to ±16.5 V

* 35 MHz Schmitt triggered digital interface

* 1.8 V compatible digital interface