AD7940BRMZ

Overview

The AD7940BRMZ is a 14-bit successive approximation analog-to-digital converter (ADC) housed in an 8-lead MSOP package. It operates from a single supply voltage ranging from 2.5 V to 5.5 V and supports throughput rates up to 100 kSPS. The device features a wide input bandwidth with a full power bandwidth of 7 MHz and achieves a signal-to-noise plus distortion ratio (SINAD) of 81 dB minimum at a 10 kHz input frequency. Power consumption is typically 4 mW at 100 kSPS with a 3 V supply and 17 mW with a 5 V supply. The internal reference is derived from the power supply, allowing an analog input range of 0 V to VDD.

Feature Summary

• Low power consumption with flexible management options including a shutdown mode for maximum efficiency.
• High-speed serial interface compatible with SPI, QSPI, Microwire, and DSP standards.
• No pipeline delays associated with the conversion process.
• Internal reference derived directly from the power supply to maximize dynamic input range.

Applications

• Battery-powered systems
• Medical instruments
• Mobile communications
• Remote data acquisition systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature grade. Ensure that the component meets RoHS compliance requirements for your region. Confirm availability through authorized distributors as stock levels fluctuate. Cross-reference the datasheet revision to ensure all specifications align with your design requirements before finalizing procurement.

Selection Notes

Select this component when a compact 14-bit resolution is required alongside low power dissipation in space-constrained designs. The absence of an external reference requirement simplifies the bill of materials. Consider the 100 kSPS throughput limit and the 0 V to VDD input range when matching signal characteristics. Evaluate the trade-off between power consumption and throughput rate using the available power-down modes.

Part Context

The AD7940 is part of Analog Devices' family of fast, low-power successive approximation ADCs. It is distinguished by being one of the first 14-bit ADCs available in a SOT-23 or MSOP package. The device utilizes advanced design techniques to achieve low power at high speeds, making it suitable for portable applications where battery life and board space are critical constraints.

Replacement Considerations

The AD7940BRMZ-REEL7 is a reel-packaged variant of the same component. Other members of the AD794x family offer different resolutions or input types but may require different pin configurations or power supplies.