AD7984BRMZ

Overview

The AD7984BRMZ is an 18-bit, 1.33 MSPS PulSAR analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a true differential analog input range of ±VREF and operates from a single 2.5 V supply with a logic interface supporting 1.8 V to 5 V levels. The device delivers a signal-to-noise ratio (SNR) of 98.5 dB at a full-scale reference voltage of 5 V. Total power dissipation is 10.5 mW at maximum throughput. Integral nonlinearity (INL) is specified at ±2.25 LSB maximum, while differential nonlinearity (DNL) ranges from -1 to +1.5 LSB. The component is housed in a 10-lead MSOP package and supports operation across a temperature range of −40°C to +85°C.

Feature Summary

• Successive approximation architecture providing zero latency conversion without pipeline delay.
• Versatile serial interface compatible with SPI, QSPI, Microwire, and DSP standards.
• Capability to daisy-chain multiple ADCs on a single bus using the SDI input.
• Integrated busy indicator feature for system synchronization.

Applications

• Automated test equipment
• Data acquisition systems
• Medical instruments
• Machine automation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure correct packaging and temperature grade. Confirm that the required external reference voltage falls within the specified 2.9 V to 5.1 V range for optimal performance. Ensure the host system logic voltage matches the VIO supply requirements for proper digital interface compatibility.

Selection Notes

Select this component when high resolution and moderate speed are required in a low-power environment. The differential input structure minimizes common-mode noise, making it suitable for precision applications. Consider the available driver amplifiers if single-ended signals must be converted to differential inputs. Verify that the external reference voltage stability meets the dynamic range requirements of the application.

Part Context

The AD7984 belongs to the PulSAR family of high-performance SAR ADCs from Analog Devices. It shares pin compatibility with the AD7982. The BRMZ suffix indicates a commercial temperature range variant packaged in a 10-lead MSOP. This series targets applications requiring precise data conversion with minimal power consumption.

Replacement Considerations

The AD7982 is a pin-for-pin compatible alternative within the same product family. Verify that the substitute part meets the specific throughput and power dissipation requirements of the design before implementation.