AD5790BCPZ-RL7

Overview

The AD5790BCPZ-RL7 is a single-channel, 20-bit unbuffered voltage output digital-to-analog converter (DAC) from Analog Devices. It operates on a bipolar supply up to ±16.5 V and features integrated precision reference buffers. Key electrical specifications include a maximum integral nonlinearity (INL) of ±2 LSB, an output noise spectral density of 8 nV/√Hz, and a gain error temperature coefficient of ±0.018 ppm/°C. The device supports a 35 MHz Schmitt-triggered serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. It is housed in a 4 mm × 5 mm LFCSP package and functions within a temperature range of −40°C to +125°C.

Feature Summary

• 20-bit resolution with ±2 LSB maximum INL accuracy
• Integrated precision reference buffers for system-ready operation
• Low noise performance: 8 nV/√Hz output noise spectral density
• Wide power supply range supporting up 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 B version grade against design requirements, as it defines the INL and DNL tolerances. Confirm that the LFCSP-24 package footprint matches the PCB layout. Ensure the external reference voltage falls within the specified input ranges relative to the analog supply rails. Check for moisture sensitivity handling requirements during assembly.

Selection Notes

Select this component when high absolute accuracy and long-term stability are critical. The integrated reference buffers simplify design by reducing board space compared to discrete solutions. Verify that the 3-wire serial interface timing meets the host controller's clock speed capabilities. Consider the DC output impedance of 3.4 kΩ for load driving limitations without an external buffer.

Part Context

The AD5790 belongs to the AD5790 family of system-ready DACs. Related devices include the AD5791 (20-bit, 1 LSB accurate), AD5780 (18-bit, buffered references), and AD5760 (16-bit). These parts share similar interface protocols and architectural features but differ in resolution and linearity specifications.

Replacement Considerations

Direct functional substitutes within the same package and pinout are not explicitly listed as drop-in replacements in the provided documentation. The AD5791 offers higher accuracy (1 LSB) but may require verification of interface compatibility. The AD5780 provides 18-bit resolution with buffered references.