AD7940BRJZ-REEL7

Overview

The AD7940BRJZ-REEL7 is a 14-bit successive approximation analog-to-digital converter (ADC) from Analog Devices, housed in a 6-lead SOT-23 package. It operates on a single supply voltage ranging from 2.5 V to 5.5 V and supports throughput rates up to 100 kSPS. The device features an internal track-and-hold amplifier with a full power bandwidth of 7 MHz and derives its reference voltage directly from the VDD supply, eliminating the need for an external reference. Power consumption is optimized through flexible management options, including a shutdown mode with maximum standby current of 0.5 µA.

Feature Summary

• First 14-bit ADC available in a compact 6-lead SOT-23 package
• Internal reference derived from the power supply for widest dynamic input range
• Flexible power management with shutdown mode for low-power applications
• No pipeline delays with SPI/QSPI/MICROWIRE/DSP compatible serial interface

Applications

• Battery-powered systems
• Medical instruments
• Remote data acquisition systems
• Instrumentation and control systems

Procurement Notes

Verify the specific ordering suffix REEL7 corresponds to tape and reel packaging when sourcing components. Confirm that the B version temperature rating aligns with operational requirements, as specifications are defined for the -40°C to +85°C range. Ensure compatibility with system logic levels, noting that digital inputs can tolerate voltages up to 7 V even at lower supply voltages.

Selection Notes

Select this component for designs requiring high resolution in minimal space without external references. Consider the trade-off between throughput rate and power dissipation, as power scales linearly with conversion speed. Evaluate source impedance effects on total harmonic distortion, particularly for AC applications where low impedance driving is recommended to maintain performance integrity.

Part Context

The AD7940 belongs to the PulSAR family of low-power, high-speed ADCs. It shares architectural similarities with other members like the AD768x series but distinguishes itself by offering 14-bit resolution in the smallest SOT-23 footprint. This positioning targets portable electronics where size constraints are critical alongside moderate sampling requirements.

Replacement Considerations

Direct pin-compatible replacements within the same package may include other variants from the AD768x or AD79xx families, though resolution and speed differences must be verified against datasheet specifications.