Analog Devices AD5791 1 ppm digital-to-analog converter

Analog Devices has introduced the 1 ppm digital-to-analog converters that improve precision instrumentation design capabilities.

The AD5791 is said to be the industry’s first single-chip, 20-bit, unbuffered voltage-output DAC that operates from a bipolar supply of up to 33. The device accepts a positive reference input in the range 4 to VDD - 2.5 V and a negative reference input in the range VSS + 2.5 to 0 V. The converter offers a relative accuracy specification of ±1 LSB max and operation is guaranteed monotonic with a ±1 LSB DNL max specification.

It uses a 3-wire serial interface that operates at clock rates up to 50 MHz and that is compatible with standard SPI, QSPI, MICROWIRE and DSP interface standards. It 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 part provides a disable feature that places the output in a defined load state.

Features include 1-ppm resolution; 1-ppm INL; 9 nV/√Hz noise spectral density; 1-ppm output drift; 0.05-ppm/°C temperature drift; 1 µs settling time; glitch energy 0.4 nV-s (5 V), 1 nV-s (10 V); operating temperature range: -40 to 125°C; 20-lead TSSOP and 4x5 mm LFCSP packages; power supply range up to ±16.5 V; 50 MHz Schmitt triggered digital interface.