AD5780ACPZ

Overview

The AD5780ACPZ is a true 18-bit, unbuffered voltage output digital-to-analog converter (DAC) from Analog Devices. It operates on bipolar supplies up to ±16.5 V and features integrated precision reference buffers. The device guarantees monotonic operation with a maximum differential nonlinearity (DNL) of ±1 LSB and integral nonlinearity (INL) of ±2 LSB for the A grade. Key electrical parameters include an 8 nV/√Hz output noise spectral density, a 3.5 µs settling time for a 500-code step, and a 35 MHz Schmitt-triggered serial interface compatible with SPI, QSPI, Microwire, and DSP standards.

Feature Summary

• True 18-bit resolution with ±2 LSB INL and ±1 LSB DNL (A Grade)
• Low noise performance: 8 nV/√Hz spectral density
• Integrated precision reference buffers eliminate external components
• Wide supply range: VDD/VSS up to ±16.5 V; Digital IOVCC 1.71 V to 5.5 V

Applications

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

Procurement Notes

Verify the specific grade suffix when ordering. The 'C' in AD5780ACPZ denotes the A Grade variant, which specifies ±2 LSB INL and ±1 LSB DNL. Ensure the procurement documentation explicitly confirms this accuracy class, as the B Grade variant offers tighter tolerances (±1 LSB INL). Confirm package type is LFCSP-24.

Selection Notes

Select the AD5780ACPZ for applications requiring high linearity without external reference buffering. The A Grade is suitable where ±2 LSB INL is acceptable. For lower glitch impulse or tighter linearity, consider the AD5781. Ensure the design supports the required bipolar analog supply rails (up to ±16.5 V) and that the digital interface logic levels match the IOVCC supply (1.71 V to 5.5 V).

Part Context

The AD5780ACPZ belongs to the AD5780 family of system-ready DACs. It is part of a series including the AD5790 (20-bit) and AD5781 (higher accuracy 18-bit). The component is designed to reduce board space by integrating reference buffers, distinguishing it from earlier generations that required external precision references and amplifiers for similar performance levels.

Replacement Considerations

The AD5780BCPZ is a direct pin-compatible replacement offering higher accuracy (B Grade, ±1 LSB INL). The AD5781 provides improved glitch impulse and linearity but may require different thermal or layout considerations due to its TSSOP-20 package option.