Analog Devices AD5780 Product Info

• True 18-bit voltage output DAC, ±1 LSB INL
• 8 nV/√Hz output noise spectral density
• 0.025 LSB long-term linearity error stability
• ±0.018 ppm/°C gain error temperature coefficient
• 2.5 µs output voltage settling time
• 3.5 nV-sec midscale glitch impulse
• Integrated precision reference buffers
• Operating temperature range: −40°C to +125°C
• 4 mm × 5 mm LFCSP package
• Wide power supply range of up to ±16.5 V
• 35 MHz Schmitt triggered digital interface
• 1.8 V-compatible digital interface

The AD5780 is a true 18-bit, unbuffered voltage output digitalto-analog converter (DAC) that operates from a bipolar supply of up to 33 V. The AD5780 accepts a positive reference input range of 5 V to V_DD − 2.5 V and a negative reference input range of V_SS + 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 specification of ±1 LSB maximum range, and operation is guaranteed monotonic with a ±1 LSB differential nonlinearity (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 serial peripheral interface (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.

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.

• Medical instrumentation
• Test and measurement
• Industrial control
• Scientific and aerospace instrumentation
• Data acquisition systems
• Digital gain and offset adjustment
• Power supply control