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¡¡¡¡The AD57901 is a single 20-bit£¬ unbuffered voltage-output DAC that operates from a bipolar supply of up to 33 V. The AD5790 accepts a positive reference input in the range of 5 V to VDD ? 2.5 V and a negative reference input in the range of VSS + 2.5 V to 0 V. The AD5790 offers a relative accuracy specification of ¡À2 LSB maximum range£¬ and operation is guaranteed monotonic with a ?1 LSB to +3 LSB DNL 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. Reference buffers are also provided on chip. The part incorporates a power-on reset circuit that ensures 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 a disable feature that places the output in a defined load state. The part provides an output clamp feature that places the output in a defined load state.