True 18-Bit, Voltage Output DAC ±0.5 LSB INL, ±0.5 LSB DNL

The AD5781 is a single 18-bit, unbuffered voltage-output DAC that operates from a bipolar supply of up to 33 V. The AD5781 accepts a positive reference input in the range 5V to VDD – 2.5 V and a negative reference input in the range VSS + 2.5 V to 0 V. The AD5781 offers a relative accuracy specification of ±0.5 LSB max, and operation is guaranteed monotonic with a ±0.5 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

* True 18-Bit Accuracy.

* Wide Power Supply Range of Up to ±16.5 V.

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

* Low 7.5 nV/√Hz Noise.

* Low 0.05 ppm/°C Temperature Drift.

APPLICATIONS

* Medical Instrumentation

* Test and Measurement

* Industrial Control

* Scientific and Aerospace Instrumentation

* Data Acquisition Systems

* Digital Gain and Offset Adjustment

* Power Supply Control

* Single 18-bit DAC, ± 0.5 LSB INL

* 7.5nV/√Hz Noise Spectral Density

* 0.05 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 ±16.5V

* 35 MHz Schmitt triggered Digital Interface

* 1.8 V compatible digital interface