AD7949BCPZRL7

Overview

The AD7949BCPZRL7 is an 8-channel, 14-bit PulSAR analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a throughput of 250 kSPS and operates on a single supply voltage ranging from 2.3 V to 5.5 V with a logic interface from 1.8 V to 5.5 V. The device utilizes a charge redistribution successive approximation register architecture, ensuring no missing codes. Key electrical parameters include a typical Signal-to-Noise Ratio (SNR) of 85.5 dB at 20 kHz input frequency, Integral Nonlinearity (INL) of ±0.5 LSB, and Differential Nonlinearity (DNL) of ±0.25 LSB. Power dissipation is specified at 13.5 mW when operating at 250 kSPS with the internal reference enabled. The component is housed in a 20-lead LFCSP package.

Feature Summary

• Integrates an 8-channel multiplexer supporting unipolar single-ended, differential, and pseudobipolar input configurations.
• Includes selectable internal voltage references of 2.5 V or 4.096 V alongside an integrated temperature sensor.
• Features a channel sequencer and a selectable one-pole low-pass filter for continuous scanning applications.
• Supports serial interfaces compatible with SPI, MICROWIRE, QSPI, and DSP protocols.

Applications

• Multichannel system monitoring
• Battery-powered equipment
• Medical instruments such as ECG/EKG
• Data acquisition systems

Procurement Notes

Verify the specific ordering suffix RL7 corresponds to the required reel packaging configuration before procurement. Confirm that the LFCSP-20 package dimensions align with the target PCB footprint. Ensure the host system provides appropriate decoupling capacitors for the VDD and VIO supplies to maintain signal integrity and stability during operation.

Selection Notes

Select this component when high resolution and moderate speed are required for multi-channel sensing. Verify that the input signal range matches the available internal or external reference options. Consider the power consumption profile relative to the desired sampling rate, as dissipation scales directly with throughput. Ensure the host microcontroller supports the required serial clock speeds and logic voltage levels.

Part Context

This part belongs to the AD7949 family of 14-bit PulSAR ADCs. It shares architectural similarities with other members like the AD7944 but offers eight channels compared to fewer in related variants. The device is designed for low-power data acquisition tasks where precision and channel count are critical factors in system design.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult official Analog Devices resources for cross-reference information if alternative sourcing is necessary.

FAQ

What is the maximum throughput of the AD7949BCPZRL7?

The maximum throughput is 250 kSPS when operating with a supply voltage between 4.5 V and 5.5 V.

Does the AD7949BCPZRL7 have any missing codes?

No, the device guarantees 14-bit resolution with no missing codes.

How is the digital interface powered?

The digital interface is powered by a separate supply pin, VIO, which can range from 1.8 V to 5.5 V, allowing compatibility with various host logic levels.