AD7911AUJ-REEL7

Overview

The AD7911AUJ-REEL7 is a dual-channel, 10-bit successive approximation analog-to-digital converter 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 4 mW typical at 250 kSPS with 3 V supplies and 13.5 mW typical with 5 V supplies. The part utilizes a flexible serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. It includes a power-down mode with maximum current consumption of 1 μA. The component is housed in an 8-lead TSOT package.

Feature Summary

• Dual-channel architecture with on-chip multiplexing for two single-ended analog inputs.
• Internal reference derived directly from the power supply to maximize dynamic input range.
• Flexible power management allowing operation at reduced throughput rates via power-down modes.
• Standard successive approximation conversion process with no pipeline delays.

Applications

• Battery-powered systems such as personal digital assistants
• Medical instruments requiring low power consumption
• Mobile communications equipment
• Instrumentation and control systems
• Data acquisition systems

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and reel specifications. Ensure compatibility with system voltage requirements between 2.35 V and 5.25 V. Confirm that the 8-lead TSOT package dimensions meet PCB layout constraints. Validate that the serial interface timing parameters align with the host microprocessor or DSP clock speeds.

Selection Notes

Select this component for applications requiring low power consumption and moderate resolution. The AD7911 offers 10-bit resolution, whereas the AD7921 variant provides 12-bit resolution. Both share similar pinouts and operational characteristics. Consider the external reference requirement if higher precision than the supply-derived reference allows. Evaluate the trade-off between throughput rate and power dissipation based on system duty cycles.

Part Context

The AD7911/AD7921 series represents Analog Devices' solution for compact, low-power data acquisition. These devices integrate high-speed ADCs into small packages suitable for space-constrained designs. The AUJ suffix typically denotes the 8-lead TSOT package configuration. This family is designed to interface directly with standard digital logic without additional level shifting in many configurations.

Replacement Considerations

The AD7921AUJ-REEL7 serves as a direct functional substitute offering 12-bit resolution instead of 10-bit. Other members of the AD791x/AD792x family may be considered if package variations or different resolution requirements are needed. Verify pin compatibility and software register mapping when substituting within the same product family.