The AD5780 1 is a true 18-bit, unbuffered voltage output DAC that operates from a bipolar supply of up to 33 V. The AD5780 accepts a positive reference input range of 5 V to VDD − 2.5 V and a negative reference input range of VSS + 2.5 V to 0 V. Both reference inputs are buffered on chip and external buffers are not required. The AD5780 offers a relative accuracy specifica-tion of ±1 LSB maximum range, and operation is guaranteed monotonic with a ±1 LSB DNL maximum range specification.
The part uses a versatile 3-wire serial interface that operates at clock rates of up to 35 MHz and is compatible with standard SPI, QSPI™, MICROWIRE™, and DSP interface standards. The part incorporates a power-on reset circuit that ensures that the DAC output powers up to 0 V 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.
1Protected by U.S. Patent No. 7,884,747 and 8,089,380.
**Product Highlights**
1. True 18-Bit Accuracy.
2. Wide Power Supply Range of Up to ±16.5 V.
3. −40°C to +125°C Operating Temperature Range.
4. Low 8 nV/√Hz Noise.
5. Low ±0.018 ppm/°C gain error temperature coefficient.
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