AD7940BRM

Overview

The AD7940BRM 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 utilizes an internal reference derived from the power supply, allowing an analog input range of 0 V to VDD. Power consumption is typically 4 mW at 100 kSPS with a 3 V supply and 17 mW with a 5 V supply. The serial interface is compatible with SPI, QSPI, Microwire, and DSP standards.

Feature Summary

• Low power consumption with flexible management options including a shutdown mode for minimal current draw.
• High-speed serial interface compatible with standard microprocessor protocols without pipeline delays.
• Internal reference derived from the power supply eliminates the need for external components.

Applications

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

Procurement Notes

Verify the specific suffix 'BRM' corresponds to the 8-lead MSOP package variant rather than the SOT-23 option. Confirm that the B version meets the required operating temperature range of -40°C to +85°C for your application environment. Ensure the ordering documentation matches the exact pinout configuration for the MSOP footprint.

Selection Notes

Select this component when a 14-bit resolution is sufficient and space constraints favor the MSOP package over the SOT-23. Consider the internal reference architecture if minimizing external bill of materials is a priority. Evaluate the power-down mode requirements against the system's duty cycle to optimize energy efficiency during idle periods.

Part Context

The AD7940 belongs to Analog Devices' family of low-power, high-throughput ADCs. It shares architectural similarities with other members like the AD7942 and AD7944 but differs in resolution and input type. The BRM designation specifically identifies the commercial grade device in the MSOP package, distinguishing it from the BRS SOT-23 variant within the same product line.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.