AD7981HFZ

Overview

The AD7981HFZ is a high-temperature, 16-bit PulSAR analog-to-digital converter (ADC) manufactured by Analog Devices. It features a successive approximation register architecture with a throughput of 600 kSPS and operates within a specified temperature range of −55°C to +210°C. The device utilizes a pseudo-differential analog input structure with a voltage range from 0 V to VREF, where VREF spans 2.4 V to 5.1 V. Power consumption scales linearly with throughput, reaching 12 mW at maximum sampling rates. It supports SPI, QSPI, MICROWIRE, and DSP-compatible serial interfaces via a separate VIO supply ranging from 1.71 V to 5.5 V.

Feature Summary

• Extreme high-temperature operation capability up to +210°C using monometallic wire bonding in a 10-lead FLATPACK package.
• High-performance 16-bit resolution with no missing codes and a zero-latency SAR architecture.
• Flexible digital interface supporting daisy-chaining multiple ADCs on a single bus with an optional busy indicator.
• Low power dissipation that scales linearly with the sampling rate for efficient battery-powered systems.

Applications

• Oil and gas exploration
• Avionics
• Heavy industrial applications
• Scientific instrumentation

Procurement Notes

Verify the specific ordering suffix HFZ corresponds to the 10-lead FLATPACK package variant when sourcing components. Confirm that the required operating environment aligns with the specified temperature range of −55°C to +210°C. Ensure external reference voltage selection remains within the 2.4 V to 5.1 V limits to maintain guaranteed performance specifications.

Selection Notes

Select this component for applications requiring precision data acquisition in extreme thermal environments. The FLATPACK package is necessary for operations exceeding +175°C. Consider the external reference requirement and the pseudo-differential input topology when designing the signal conditioning front end. Verify logic level compatibility between the VIO supply and the host microcontroller interface.

Part Context

The AD7981HFZ belongs to the AD7981 series of high-temperature PulSAR ADCs. It shares architectural similarities with other members like the AD7985 and AD7986 but is distinguished by its extended temperature rating and FLATPACK packaging. This part is designed for harsh environments where standard commercial-grade converters would fail, offering robustness through specialized manufacturing processes.

Replacement Considerations

The AD7981H is the MSOP package equivalent with a lower temperature limit of +175°C. Other family members include the AD7985 (16-bit) and AD7986 (18-bit), though these utilize different 20-lead packages and may require schematic modifications.