AD7981HRMZ

Overview

The AD7981HRMZ is a 16-bit, 600 kSPS PulSAR analog-to-digital converter designed for extreme high-temperature environments. It features a pseudo-differential analog input range of 0 V to VREF (2.4 V to 5.1 V) and operates from a single 2.5 V supply with a separate 1.8 V to 5.5 V digital interface supply. The device achieves a signal-to-noise ratio of 91 dB and total harmonic distortion of -102 dB at 1 kHz. It consumes 4.65 mW at full throughput and supports SPI, QSPI, Microwire, and DSP-compatible serial interfaces in a compact 10-lead MSOP package rated for operation up to +175°C.

Feature Summary

• Extreme high-temperature qualification specified up to +175°C for the MSOP package
• Pseudo-differential analog input architecture simplifies driver requirements
• Versatile serial interface supporting daisy-chaining and busy indicator modes
• Low power dissipation scales linearly with sampling throughput

Applications

• Oil and gas exploration systems
• Avionics data acquisition
• Heavy industrial monitoring
• Scientific instrumentation

Procurement Notes

Verify the specific ordering suffix HRMZ corresponds to the 10-lead MSOP package variant when sourcing components. Confirm that the required operating temperature range aligns with the +175°C maximum rating for this specific package type rather than the FLATPACK variant. Ensure external reference voltage specifications match the device's 2.4 V to 5.1 V input window.

Selection Notes

Select the AD7981HRMZ when applications require 16-bit resolution combined with high-speed sampling in elevated thermal conditions. Consider the pseudo-differential input structure if system grounding allows connection of IN- to analog ground. Evaluate the separate VIO supply requirement if the host logic voltage differs significantly from the analog core voltage.

Part Context

This component belongs to Analog Devices' high-temperature PulSAR ADC series. It shares architectural similarities with other members like the AD7980 and AD7983 but is distinguished by its extended thermal rating and specific throughput characteristics. The HRMZ suffix identifies the monometallic wire bonding MSOP package optimized for robustness in harsh environments.

Replacement Considerations

Direct replacements within the same family include the AD7980BRMZ or AD7983BRMZ, though these typically have lower maximum operating temperatures. Verify pin compatibility and interface mode settings when substituting models with different thermal ratings or throughput capabilities.