AD7980ACPZ-RL7

Overview

The AD7980ACPZ-RL7 is a 16-bit, 1 MSPS PulSAR analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 2.5 V supply with a 1.8 V to 5 V logic interface and features a pseudo-differential input range of 0 V to VREF. The device utilizes an external reference voltage between 2.4 V and 5.1 V. Key performance metrics include a maximum integral nonlinearity error of ±1.25 LSB, a signal-to-noise ratio of 91.5 dB at a 5 V reference, and a total power dissipation of 10 mW at 1 MSPS throughput. It is housed in a 10-lead LFCSP package.

Feature Summary

• Features a zero-latency successive approximation architecture for immediate data availability after conversion completion.
• Supports versatile serial communication modes including SPI, QSPI, Microwire, and DSP compatibility via a dedicated SDI pin.
• Enables daisy-chaining of multiple ADCs on a single bus using the SDI input while providing an optional busy indicator.

Applications

• Automated test equipment
• Data acquisition systems
• Medical instruments

Procurement Notes

Verify the specific grade (A or B) required for your application, as linearity and noise specifications vary between grades. Confirm that the LFCSP-10 package matches your PCB footprint design. Ensure the external reference voltage falls within the 2.4 V to 5.1 V range to maintain specified accuracy levels across the full operating temperature range.

Selection Notes

Select this component when a high-resolution 16-bit ADC with low power consumption is needed for battery-powered or thermally constrained systems. Consider the A-grade version if tighter integral nonlinearity limits are required compared to the B-grade. Verify that the host microcontroller supports the desired serial interface mode, particularly if utilizing the daisy-chain capability for multi-channel applications.

Part Context

The AD7980 belongs to the PulSAR family of precision SAR ADCs from Analog Devices. It is part of a broader portfolio that includes various resolutions and speeds, such as the AD7988 and AD7680 series. This specific model targets applications requiring a balance of high resolution and moderate sampling rates without the complexity of differential inputs.

Replacement Considerations

The AD7980BCPZ-RL7 is a pin-compatible alternative offering different linearity specifications. For higher speed requirements, consider the AD7988 series. If a µModule solution with integrated signal conditioning is preferred, the ADAQ7980 provides a complete system-in-package approach.

FAQ

How does the SDI pin function in chain mode?

In chain mode, the SDI pin acts as a serial data input. Digital data present on the SDI pin during the CNV rising edge is output on the SDO pin with a delay of 16 SCK cycles, allowing multiple ADCs to be daisy-chained.

What is the impact of VIO on the maximum throughput rate?

The throughput rate depends on the VIO supply voltage. At VIO above 3.3 V, the device achieves 1 MSPS. If VIO is between 2.3 V and 3.3 V, the maximum throughput is limited to 833 kSPS.

Can the reference voltage be independent of the supply voltage?

Yes, the REF voltage is applied externally and can be set independently of the VDD supply voltage, provided it remains within the specified range of 2.4 V to 5.1 V.