AD5781 Datasheet

• 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

• Medical Instrumentation
• Test and Measurement
• Industrial Control
• Scientific and Aerospace Instrumentation
• Data Acquisition Systems
• Digital Gain and Offset Adjustment
• Power Supply Control

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 V_DD – 2.5 V and a negative reference input in the range V_SS + 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.