GENERAL DESCRIPTION

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 DNL maximum specification.

The part uses a versatile 3-wire serial interface that operates at clock rates up to 35 MHz and that is compatible with standard SPI, QSPI™, MICROWIRE™, and DSP interface standards. The part 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 an output clamp feature that places the output in a defined load state.

PRODUCT HIGHLIGHTS

1. 1 ppm Accuracy.

2. Wide Power Supply Range up to ±16.5 V.

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

4. Low 7.5 nV/√Hz Noise Spectral Density.

5. Low 0.05 ppm/°C Temperature Drift.

FEATURES

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

1 µs 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

APPLICATIONS

Medical instrumentation

Test and measurement

Industrial control

High end scientific and aerospace instrumentation