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AD7921AUJZ-R2
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Product Detailed Parameters
- Description：IC ADC 12BIT SAR TSOT23-8
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Number of Bits：12
- Sampling Rate (Per Second)：250k
- Number of Inputs：2
- Input Type：Single Ended
- Data Interface：SPI, DSP
- Configuration：MUX-S/H-ADC
- Ratio - S/H:ADC：1:01
- Number of A/D Converters：1
- Architecture：SAR
- Reference Type：Supply
- Voltage - Supply, Analog：2.35V ~ 5.25V
- Voltage - Supply, Digital：2.35V ~ 5.25V
- Features：-
- Operating Temperature：-40°C ~ 85°C
- Package / Case：SOT-23-8 Thin, TSOT-23-8
- Supplier Device Package：TSOT-23-8
- Mounting Type：Surface Mount
- Grade：-
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Overview
The AD7921AUJZ-R2 is a dual-channel, 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices. It operates from a single power supply ranging from 2.35 V to 5.25 V and supports throughput rates up to 250 kSPS. The device features an on-chip track-and-hold amplifier capable of handling input frequencies exceeding 6 MHz. It utilizes a flexible serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. 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 component is housed in an 8-lead TSOT package.
Feature Summary
- Dual-channel architecture with independent channel selection via the DIN pin
- Internal reference derived directly from the VDD supply rail
- Flexible power management with standby mode reducing current to 1 μA maximum
- Zero pipeline delay for immediate data availability following conversion
Applications
- Battery-powered personal digital assistants
- Medical instrumentation systems
- Mobile communications equipment
- Data acquisition systems
Procurement Notes
Verify the specific ordering suffix against official documentation to confirm packaging configuration. Ensure compatibility with the required voltage range and temperature specifications before integration. Confirm that the component meets all necessary regulatory standards for the intended deployment environment.
Selection Notes
Select this component when a low-power, high-speed solution is required for dual-channel signal digitization. The internal reference simplifies design by eliminating the need for external voltage references. Consider the TSOT package constraints for board space limitations and thermal requirements.
Part Context
This part belongs to the AD7911/AD7921 family of high-speed, low-power ADCs. The AD7921 variant specifically provides 12-bit resolution compared to the 10-bit resolution of the AD7911. Both share identical pinouts, interfaces, and power characteristics, differing primarily in accuracy and dynamic performance metrics.
Replacement Considerations
The AD7911AUJZ-R2 serves as a lower-resolution alternative within the same package and interface ecosystem. Verify that the 10-bit resolution of the AD7911 meets system accuracy requirements if substituting.
