AD7988-5BRMZ

Overview

The AD7988-5BRMZ is a 16-bit, low-power PulSAR analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 2.5 V supply and delivers a throughput of 500 kSPS. The device features a pseudo-differential input range of 0 V to VREF, where the reference voltage can be set between 2.4 V and 5.1 V independently of the power supply. Key performance metrics include a Signal-to-Noise Ratio (SNR) of 91.5 dB at a 5 V reference, an Integral Nonlinearity (INL) of ±1.25 LSB maximum, and a Differential Nonlinearity (DNL) of ±0.9 LSB maximum. Total power dissipation at 500 kSPS is typically 3.5 mW. The component utilizes a versatile serial interface compatible with SPI, Microwire, and DSP standards, housed in a 10-lead MSOP package.

Feature Summary

• Features a zero-latency successive approximation architecture that eliminates pipeline delay for multiplexed applications.
• Supports daisy-chaining multiple devices on a single bus via the SDI input for expanded system scalability.
• Provides flexible digital interfacing through a separate VIO supply compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic levels.

Applications

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

Procurement Notes

Verify the specific suffix BRMZ corresponds to the 10-lead MSOP package variant when sourcing. Confirm the operating temperature range requirements align with the specified -40°C to +125°C industrial grade. Ensure external reference components match the required voltage range specifications for optimal accuracy.

Selection Notes

Select this model over the AD7988-1 variant when higher sampling rates up to 500 kSPS are required. Consider the AD7988-5BCPZ-RL if a leadless LFCSP package is preferred for space-constrained designs. Evaluate total power consumption against battery life requirements, noting the standby current characteristics.

Part Context

This component belongs to the AD7988-x family of 16-bit PulSAR ADCs. It shares architectural similarities with the AD7988-1 but offers increased throughput. The series is designed for precision applications requiring low power consumption and high linearity within a compact footprint.

Replacement Considerations

AD7988-5BCPZ-RL: Offers identical electrical performance in a 10-lead LFCSP package instead of MSOP.

FAQ

How does the CNV pin function determine the interface mode?

The state of the SDI pin during the rising edge of the CNV signal determines the mode. If SDI is low, Chain Mode is selected; if SDI is high, Chip Select (CS) Mode is selected.

What is the relationship between VDD and VIO supplies?

VDD powers the analog core and must be 2.5 V. VIO powers the digital I/O interface and can range from 1.8 V to 5.5 V, allowing compatibility with various host logic families.

Does the AD7988-5 exhibit pipeline latency?

No, the device uses a zero-latency architecture. Conversion results are available immediately after the conversion completes without pipeline delay.