AD7961BCPZ

Overview

The AD7961BCPZ is a 16-bit, 5 MSPS PulSAR differential analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a successive approximation register (SAR) architecture with no pipeline latency. The device supports true differential analog inputs with voltage ranges of ±4.096 V or ±5 V and utilizes an external reference voltage of 2.048 V buffered to 4.096 V, 4.096 V, or 5 V. Key performance metrics include a signal-to-noise ratio (SNR) of 95.5 dB, total harmonic distortion (THD) of −116 dB, integral nonlinearity (INL) of ±0.2 LSB typical, and differential nonlinearity (DNL) of ±0.14 LSB typical. Power dissipation is 46.5 mW at 5 MSPS with an external reference buffer in echoed clock mode. It operates within a temperature range of −40°C to +85°C and is housed in a 32-lead LFCSP package.

Feature Summary

• True differential analog input architecture for effective common-mode noise rejection
• Low power consumption enabled by charge redistribution SAR technology
• Flexible serial LVDS interface supporting self-clocked and echoed clock modes
• Integrated internal reference buffer for simplified system design

Applications

• Digital imaging systems
• Computed tomography
• MRI gradient control
• High speed data acquisition

Procurement Notes

Verify the specific suffix BC against official documentation to confirm temperature grade and packaging details. Ensure compatibility with 5 V analog supplies and 1.8 V digital interfaces during integration. Confirm that the required reference voltage matches the selected configuration options provided in the datasheet specifications.

Selection Notes

Select this component when high linearity and low latency are critical for multiplexed channel applications. The absence of pipeline delay makes it suitable for systems requiring immediate data availability. Evaluate power constraints carefully, as enabling the internal reference buffer increases current draw significantly compared to using an external buffer.

Part Context

The AD7961 belongs to the PulSAR family of high-speed, precision ADCs from Analog Devices. It shares architectural similarities with other members like the AD7960 but offers 16-bit resolution at 5 MSPS throughput. This part is designed to bridge the gap between moderate speed requirements and high accuracy needs in industrial and medical instrumentation.

Replacement Considerations

The AD7960 is an 18-bit variant within the same family offering similar speed characteristics. For pseudo-differential applications, the AD7985 provides comparable performance levels. Verify pinout and software compatibility before substituting with other SAR ADCs in the portfolio.