AD7911AUJZ-R2

Overview

The AD7911AUJZ-R2 is a dual-channel, 10-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices. It operates from a single supply voltage ranging from 2.35 V to 5.25 V and supports throughput rates up to 250 kSPS. The device features an internal track-and-hold amplifier capable of handling input frequencies exceeding 6 MHz. Power consumption is specified at a maximum of 20 mW during operational mode at 5 V. The component utilizes a flexible serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. It is housed in an 8-lead TSOT package and includes a power-down mode with a maximum current draw of 1 μA.

Feature Summary

• Dual-channel architecture with on-chip multiplexing for efficient signal acquisition.
• Low power dissipation achieved through advanced design techniques and configurable power-down modes.
• Internal reference derived directly from the power supply to maximize dynamic input range.
• No pipeline delays associated with the conversion process for immediate data availability.

Applications

• Battery-powered personal digital assistants
• Medical instruments requiring low power consumption
• Mobile communications systems
• Data acquisition systems

Procurement Notes

Verify the specific suffix R2 indicates reel packaging when sourcing components. Confirm the A grade temperature range meets the operational requirements of -40°C to +85°C. Ensure the TSOT-8 package footprint aligns with the printed circuit board layout specifications before finalizing procurement orders.

Selection Notes

Select this model when a 10-bit resolution is sufficient for the application, as opposed to the 12-bit AD7921 variant. Consider the 250 kSPS throughput rate against the system's sampling requirements. Evaluate the 2.35 V to 5.25 V supply range compatibility with existing power rails. Verify that the single-ended input configuration matches the sensor output type.

Part Context

This component belongs to the AD7911/AD7921 series of high-speed, low-power ADCs from Analog Devices. The series shares identical pinouts and functional blocks, differing primarily in resolution. The AUJZ designation specifies the A grade performance level and the TSOT-8 surface-mount package type. The R2 suffix denotes the tape and reel packaging format used for automated assembly.

Replacement Considerations

The AD7921AUJZ-R2 serves as a direct pin-compatible alternative offering 12-bit resolution instead of 10-bit. Both devices share the same package, supply voltage range, and interface protocols. Designers must verify if the increased resolution impacts power consumption or timing requirements within the existing system constraints.