AD5790BCPZ

Overview

The AD5790BCPZ is a single-channel, 20-bit voltage output digital-to-analog converter (DAC) from Analog Devices. It operates on bipolar supplies up to ±16.5 V and features an integrated precision reference buffer. The device guarantees monotonic operation with a maximum integral nonlinearity (INL) of ±2 LSB and a differential nonlinearity (DNL) range of −1 LSB to +3 LSB. Key electrical specifications include an output noise spectral density of 8 nV/√Hz, a gain error temperature coefficient of ±0.018 ppm/°C, and a settling time of 2.5 µs for a 10 V step. It utilizes a versatile 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards, supporting clock rates up to 35 MHz.

Feature Summary

• 20-bit resolution with ±2 LSB INL accuracy
• Integrated precision reference buffers
• Low noise: 8 nV/√Hz spectral density
• Wide supply range: ±2.5 V to ±16.5 V

Applications

• Medical instrumentation
• Test and measurement equipment
• Industrial control systems
• Scientific and aerospace instrumentation
• Data acquisition systems

Procurement Notes

Verify the specific suffix 'BCPZ' against the manufacturer's ordering guide to confirm package type (LFCSP-24) and temperature grade. Ensure compatibility with system power rails, as the device requires separate analog supplies (VDD/VSS) and digital supplies (VCC/IOVCC). Confirm that the external reference voltage falls within the specified input ranges relative to the analog supplies.

Selection Notes

Select this component when high absolute accuracy and low drift are required in a single-channel application. The integrated reference buffers simplify design by reducing board space compared to discrete solutions. Consider the 35 MHz interface speed for high-throughput data acquisition. Verify that the external amplifier configuration matches the unbuffered output architecture if higher drive capability is needed.

Part Context

The AD5790 belongs to the AD5760/AD5780/AD5790 family of system-ready DACs. It offers higher resolution than the 16-bit AD5760 and 18-bit AD5780 variants. Companion products include output amplifiers like the ADA4898-1 and external references such as the ADR4550. The device is designed to replace multiple discrete components, integrating reference conditioning and logic control into a compact 4 mm × 5 mm LFCSP package.

Replacement Considerations

The AD5791 is a related 20-bit variant with 1 LSB accuracy. For lower resolution needs, consider the AD5780 (18-bit) or AD5760 (16-bit). These devices share similar pinouts and interfaces but differ in linearity specifications and reference buffer configurations.