AD7984BRMZ-RL7

Overview

The AD7984BRMZ-RL7 is an 18-bit, 1.33 MSPS PulSAR analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 2.5 V supply with a separate VIO interface supporting 1.8 V to 5 V logic levels. The device features true differential analog inputs and an external reference voltage range of 2.9 V to 5.1 V. Key performance metrics include a signal-to-noise ratio (SNR) of 98.5 dB at 1 kHz input frequency, a total harmonic distortion (THD) of −110.5 dB, and a maximum integral nonlinearity (INL) of ±2.25 LSB. Power consumption is 10.5 mW at full throughput. It utilizes a proprietary serial interface compatible with SPI, QSPI, Microwire, and DSP protocols.

Feature Summary

• True differential analog input architecture for high common-mode rejection
• Zero latency successive approximation register (SAR) conversion process
• Flexible digital interface supporting daisy-chaining and busy indicator modes
• Low power dissipation scaling linearly with throughput rate

Applications

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

Procurement Notes

Verify the specific ordering suffix RL7 indicates tape and reel packaging when sourcing components. Confirm that the BRMZ variant corresponds to the MSOP package type and the specified temperature range. Ensure compatibility with the required logic voltage levels on the VIO pin before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring high resolution and moderate speed without pipeline delay. Verify that the external reference voltage falls within the 2.9 V to 5.1 V operational range. Consider the 10-lead MSOP or LFCSP package availability based on board space constraints and thermal requirements.

Part Context

The AD7984 belongs to the PulSAR family of precision SAR ADCs from Analog Devices. It is pin-for-pin compatible with the 18-bit AD7982. The device integrates a track-and-hold circuit and does not require an external clock for the conversion process, relying instead on the serial clock for data output.

Replacement Considerations

The AD7982 is a pin-compatible alternative within the same series. Verify if the lower throughput or different linearity specifications of other family members meet the system requirements before substitution.