AD7980ARMZ

Overview

The AD7980ARMZ is a 16-bit, successive approximation analog-to-digital converter (ADC) from Analog Devices Inc., housed in a 10-lead MSOP package. It operates on a single 2.5 V supply with a separate digital interface supply (VIO) supporting 1.8 V to 5 V logic levels. The device features a pseudo-differential input range of 0 V to VREF, where VREF is externally applied between 2.4 V and 5.1 V. It achieves a throughput rate of up to 1 MSPS with a total power dissipation of 7 mW at maximum speed. Key performance metrics include an Integral Nonlinearity (INL) of ±1.25 LSB maximum, a Signal-to-Noise Ratio (SNR) of 91.5 dB at fIN = 10 kHz with VREF = 5 V, and a Total Harmonic Distortion (THD) of −114 dB under the same conditions.

Feature Summary

• Zero-latency architecture providing immediate data availability after conversion completion without pipeline delay.
• Versatile serial interface compatible with SPI, QSPI, Microwire, and DSP protocols, supporting daisy-chaining via the SDI input.
• Low power consumption that scales linearly with throughput, enabling efficient operation in battery-powered applications.
• Wide operating temperature range specified from −40°C to +125°C for industrial and automotive environments.

Applications

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

Procurement Notes

Verify the specific grade (A or B) required for your application, as specifications such as INL and SNR vary between grades. Confirm the package type matches the design footprint, as the AD7980 family includes both MSOP and LFCSP options. Ensure the external reference voltage falls within the 2.4 V to 5.1 V range to maintain valid operation. Check the VIO supply requirements to ensure compatibility with the host system's logic levels.

Selection Notes

Select the AD7980ARMZ when a 16-bit resolution and 1 MSPS throughput are required in a compact surface-mount package. Choose this part over the LFCSP variant if the board layout constraints favor the MSOP form factor. Consider the A-grade version for tighter linearity specifications or the B-grade for cost-sensitive designs. Ensure the application can provide a stable external reference voltage, as the device does not contain an internal reference.

Part Context

The AD7980 is part of Analog Devices' PulSAR ADC family, designed for low-power, high-speed data conversion tasks. It utilizes a successive approximation register (SAR) architecture optimized for efficiency. The ARMZ suffix denotes the 10-lead MSOP package variant with a RoHS-compliant lead finish. This component serves as a bridge between analog sensor signals and digital processing systems in precision measurement applications.

Replacement Considerations

The AD7980ACPZ and AD7980BCPZ are pin-compatible alternatives offering the same electrical performance in a 10-lead LFCSP package. When replacing the ARMZ with a CPZ variant, verify that the PCB thermal pad connection is implemented correctly, as the LFCSP package requires the exposed pad to be connected to ground for optimal thermal performance.