AD7741BRZ-REEL7

Overview

The AD7741BRZ-REEL7 is a single-channel synchronous voltage-to-frequency converter (VFC) from Analog Devices. It operates on a single +5 V supply with a voltage range of 4.75 V to 5.25 V. The device features an integral nonlinearity of 0.012% at a maximum output frequency of 1.35 MHz. It includes a buffered analog input, a programmable gain front-end, and an internal +2.5 V reference. The part supports power-down mode with typical current consumption of 6 mA in normal operation.

Feature Summary

• Synchronous voltage-to-frequency conversion using charge-balance technique
• Integrated +2.5 V bandgap reference with external overdrive option
• Buffered analog input stage for high impedance sourcing
• Pin-programmable power-down mode for low standby current

Applications

• Low-cost analog-to-digital conversion systems
• Signal isolation applications using opto-couplers
• Industrial sensor interfaces requiring ratiometric measurement

Procurement Notes

Verify the specific suffix BRZ indicates the industrial temperature range (-40°C to +85°C) and SOIC-8 package configuration. Confirm that the REEL7 designation corresponds to the tape and reel packaging format required for automated assembly processes. Ensure compatibility with existing board layouts regarding pin assignments and thermal requirements.

Selection Notes

Select this component when a single-ended input channel is sufficient for the application. Consider the AD7742 if multiple differential or pseudo-differential channels are required. Evaluate the need for the internal reference versus an external precision reference based on system accuracy requirements. Verify that the master clock frequency aligns with the desired output frequency span and resolution.

Part Context

This component belongs to the AD7741/AD7742 family of synchronous voltage-to-frequency converters. The AD7741 variant provides a single-channel solution, while the AD7742 offers multi-channel capabilities. Both share similar architecture but differ in input configurations and package lead counts. The BRZ suffix denotes the industrial temperature grade and plastic SOIC package type.

Replacement Considerations

Direct substitutes within the same family include the AD7741BN for DIP packaging or the AD7741YR for extended temperature ranges. Cross-family replacements require careful evaluation of pin compatibility and performance specifications.