AD7980BCPZ-RL7

Overview

The AD7980BCPZ-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 separate digital interface supply ranging from 1.71 V to 5.5 V. The device features a pseudo-differential input range of 0 V to VREF and supports SPI/QSPI/MICROWIRE/DSP interfaces. Key performance metrics include an INL of ±1.25 LSB maximum, SNR of 91.5 dB at 10 kHz, and THD of −114 dB. Power consumption is 7 mW total at 1 MSPS. It is housed in a 10-lead LFCSP package and operates within a temperature range of −40°C to +125°C.

Feature Summary

• Zero latency architecture providing immediate data availability after conversion completion.
• Proprietary serial interface compatible with standard protocols, supporting daisy-chaining via the SDI input.
• Low power dissipation scaling linearly with throughput for battery-operated applications.
• Wide operating temperature range suitable for industrial and medical environments.

Applications

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

Procurement Notes

Verify the specific grade suffix 'B' against the required accuracy specifications, as it differs from the 'A' grade in linearity and noise parameters. Confirm the 'RL7' suffix indicates reel packaging when sourcing components. Ensure the LFCSP thermal pad is properly connected to ground during assembly to maintain optimal thermal performance and electrical grounding.

Selection Notes

Select this component for applications requiring high resolution and moderate speed without pipeline delay. Consider the B-grade specifications if tighter integral nonlinearity is not critical compared to the A-grade variant. Evaluate the external reference voltage requirements, as the ADC relies on an independent REF pin rather than an internal reference source.

Part Context

The AD7980 belongs to the PulSAR family of successive approximation register ADCs from Analog Devices. This series is designed for low-power, medium-speed data acquisition tasks. The BC part number specifically denotes the B-grade performance level packaged in the LFCSP form factor, distinguishing it from MSOP packages or other performance grades within the same functional family.

Replacement Considerations

AD7980ACPZ-RL7

FAQ

How does the AD7980 handle multiple devices on a single bus?

The device supports daisy-chaining through its SDI input. When configured in chain mode, the digital data level on SDI is output on SDO with a delay of 16 SCK cycles, allowing multiple ADCs to connect to a single SDO line.

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

Throughput 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 rate remains 1 MSPS up to 85°C but drops to 833 kSPS above that temperature. Below 2.3 V, the maximum rate is limited to 833 kSPS.

Is the AD7980BCPZ-RL7 compatible with 1.8 V logic?

Yes, the digital interface is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic levels, provided the separate VIO supply is set accordingly within the 1.71 V to 5.5 V range.