AD7989-5BRMZ

Overview

The AD7989-5BRMZ is an 18-bit, 500 kSPS PulSAR analog-to-digital converter (ADC) from Analog Devices. It features a true differential analog input range of ±VREF with VREF between 2.4 V and 5.1 V. The device operates on a single 2.5 V supply with logic interface compatibility for 1.8 V, 2.5 V, 3 V, and 5 V via the separate VIO pin. Key performance metrics include a typical SNR of 98 dB at fIN = 1 kHz and VREF = 5 V, THD of −119 dB, and dynamic range of 99 dB. Power dissipation is 3.5 mW total at 500 kSPS throughput. It utilizes a proprietary serial interface compatible with SPI/QSPI/MICROWIRE/DSP standards.

Feature Summary

• Zero latency architecture providing immediate data availability after conversion completion without pipeline delay.
• True differential analog input voltage range allowing operation with signals swinging in opposite phases.
• Flexible digital interface supporting daisy-chaining multiple ADCs on a single bus using the SDI/CS input.

Applications

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

Procurement Notes

Verify the specific suffix BRMZ corresponds to the MSOP-10 package variant when sourcing. Confirm that the required throughput matches the AD7989-5 specification of 500 kSPS rather than the AD7989-1's 100 kSPS rate. Ensure external reference voltage requirements align with the specified 2.4 V to 5.1 V range for optimal accuracy.

Selection Notes

Select this component for applications requiring high resolution and moderate speed with low power consumption. The 18-bit resolution supports precise measurements, while the 500 kSPS rate suits dynamic signal processing. Consider the MSOP-10 package constraints for PCB layout. Verify that the system can provide the necessary 2.5 V analog supply and appropriate digital logic levels.

Part Context

This part belongs to the AD7989-1/AD7989-5 family of 18-bit PulSAR ADCs. The AD7989-5 variant specifically offers 500 kSPS throughput compared to the 100 kSPS of the AD7989-1. Both share identical architectural features but differ in speed and power characteristics. The BRMZ suffix denotes the MSOP-10 package option within this series.

Replacement Considerations

The AD7989-1BCPZ is a pin-compatible alternative offering lower throughput (100 kSPS). For higher speed requirements within the same family, consider the AD7691 or AD4011. Direct replacements must maintain 18-bit resolution and differential input capability.

FAQ

What is the maximum reference voltage supported by the AD7989-5BRMZ?

The reference voltage (VREF) range is specified from 2.4 V to 5.1 V.

Does the AD7989-5BRMZ have pipeline delay?

No, it features a zero latency architecture where conversion results are available immediately after the completed conversion.

How does the SDI/CS pin function in chain mode?

In chain mode, selected by holding SDI/CS low during the CNV rising edge, it acts as a data input that daisy-chains conversion results from multiple ADCs onto a single SDO line.