AD7988-1BCPZ-RL7

Overview

The AD7988-1BCPZ-RL7 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 provides a throughput of 100 kSPS. The device features a pseudo-differential input range of 0 V to VREF, where the external reference voltage can be set between 2.4 V and 5.1 V. It utilizes a versatile serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards, supporting daisy-chaining via the SDI input. The component is housed in a 10-lead LFCSP package and is specified for operation across a temperature range of −40°C to +125°C.

Feature Summary

• Zero latency architecture with no pipeline delay, enabling immediate data availability after conversion completion.
• Versatile serial interface port that supports multiple communication protocols including SPI, QSPI, MICROWIRE, and DSP modes.
• Low power dissipation capabilities with independent digital logic supply options ranging from 1.8 V to 5 V.

Applications

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

Procurement Notes

Verify the specific suffix RL7 corresponds to reel packaging when sourcing components. Confirm the BC grade designation matches the required timing specifications for your application. Ensure compatibility with the host system's voltage levels for both VDD and VIO supplies before integration.

Selection Notes

Select this model for applications requiring high resolution with minimal power consumption at moderate sampling rates. Consider the AD7988-5 variant if higher throughput up to 500 kSPS is necessary. Evaluate the need for external reference voltage stability as it directly impacts dynamic performance metrics such as SNR and SINAD.

Part Context

This component belongs to the AD7988-x series of 16-bit PulSAR ADCs. It shares architectural similarities with other members like the AD7988-5 but differs in maximum throughput speed. The series is designed for precision data acquisition tasks where space constraints and power efficiency are critical design factors.

Replacement Considerations

The AD7988-5 serves as a higher-speed alternative within the same family. Other pin-compatible options include the AD7684 or AD7687 for similar resolution requirements. Verify interface compatibility and thermal characteristics when substituting with devices from different manufacturers.

FAQ

How does the SDI input affect the interface mode?

The SDI input determines the operational mode during the CNV rising edge. If SDI is low, the device enters chain mode for daisy-chaining multiple ADCs. If SDI is high, it operates in CS mode.

What is the impact of the reference voltage on performance?

The reference voltage sets the full-scale input range. Higher reference voltages generally improve dynamic performance metrics like Signal-to-Noise Ratio (SNR) and Spurious-Free Dynamic Range (SFDR).

Can the device operate with different digital logic voltages?

Yes, the AD7988-1 supports digital logic interfaces ranging from 1.8 V to 5 V through the separate VIO supply pin, allowing flexibility in interfacing with various microcontrollers.