AD7961BCPZ-RL7

Overview

The AD7961BCPZ-RL7 is a 16-bit, 5 MSPS PulSAR differential analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It utilizes a charge redistribution successive approximation register (SAR) architecture to achieve high precision without pipeline latency. The device features true differential analog inputs with a voltage range of ±4.096 V or ±5 V and supports external reference options including 2.048 V buffered to 4.096 V, 4.096 V, and 5 V. It operates on dual power supplies: VDD1 at 5 V and VDD2/VIO at 1.8 V. Key performance metrics include a typical signal-to-noise ratio (SNR) of 95.5 dB, total harmonic distortion (THD) of −116 dB, and integral nonlinearity (INL) of ±0.2 LSB. Power dissipation ranges from 39 mW to 64.5 mW depending on the clock mode and reference buffer configuration.

Feature Summary

• Charge redistribution SAR architecture providing no latency or pipeline delay for multiplexed channel applications.
• Low voltage differential signaling (LVDS) serial interface supporting both self-clocked and echoed clock modes.
• Integrated internal reference buffer capable of generating a 4.096 V system reference from a 2.048 V input.
• Conversion control via CNV± pins compatible with either CMOS or LVDS logic levels.

Applications

• Digital imaging systems
• Computed tomography
• MRI gradient control

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and reel specifications. Ensure that the required supply voltages and reference configurations align with the system design before finalizing procurement. Cross-reference the datasheet revision history to confirm compatibility with existing design parameters.

Selection Notes

Select this component when a 16-bit resolution and 5 MSPS throughput are required in a low-power environment. Consider the internal reference buffer if board space for external components is limited. Evaluate the LVDS interface requirements against the digital host capabilities to determine the appropriate clocking mode.

Part Context

The AD7961 belongs to the PulSAR family of ADCs, designed for high-speed, high-precision data acquisition. It is part of a broader selection of differential ADCs offered by Analog Devices, catering to applications requiring fast sampling rates with minimal signal processing latency.

Replacement Considerations

The AD7960 is an 18-bit variant within the same family offering similar throughput but higher resolution. Designers should verify pinout compatibility and software adjustments when substituting between these models.