AD7741BR-REEL

Overview

The AD7741BR-REEL is a single-channel synchronous voltage-to-frequency converter from Analog Devices. It operates on a single +5 V supply with a 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, programmable gain front-end, and an internal +2.5 V reference. The industrial temperature version (B) functions between -40°C and +85°C.

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
• Active low power-down mode for reduced current consumption

Applications

• Low cost analog-to-digital conversion systems
• Signal isolation applications using opto-couplers
• Industrial sensor signal conditioning

Procurement Notes

Verify the B suffix indicates the industrial temperature range (-40°C to +85°C). Confirm the REEL suffix denotes tape and reel packaging. Ensure the specific orderable part number matches the required package style and thermal grade before procurement.

Selection Notes

Select this component for applications requiring high linearity and inherent monotonicity in voltage-to-frequency conversion. The synchronous architecture allows system stability to be determined by the external clock source rather than internal capacitors. Consider the single-ended input limitation compared to the multichannel AD7742 variant.

Part Context

This part belongs to the AD7741/AD7742 family of CMOS synchronous voltage-to-frequency converters. The AD7741 provides a single-channel solution in an 8-lead package, while the AD7742 offers multiple differential inputs in a 16-lead package. Both utilize a proprietary analog modulator and charge-balance conversion method.

Replacement Considerations

The AD7741YR serves as the automotive temperature range alternative within the same package. The AD7742 series provides multi-channel functionality but requires a different pinout and package.