AD7741BRZ

Overview

The AD7741BRZ is a single-channel synchronous voltage-to-frequency converter in an 8-lead SOIC package. It operates from a single +5 V supply (4.75 V to 5.25 V) and features a buffered analog input with a range of 0 V to VREF. The device includes an on-chip +2.5 V bandgap reference, programmable gain front-end, and power-down logic. Integral nonlinearity is specified at 0.012% at fOUT(Max) = 1.35 MHz. It requires minimal external components and supports clock frequencies up to 6.144 MHz.

Feature Summary

• Synchronous voltage-to-frequency conversion using charge-balance technique
• Integrated +2.5 V bandgap reference with external reference option
• Buffered analog input stage for high impedance source interfacing
• Active low power-down mode for reduced current consumption

Applications

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

Procurement Notes

Verify the B suffix indicates industrial temperature range (-40°C to +85°C). Confirm the R suffix denotes the SOIC-8 package type. Ensure the REEL designation matches tape-and-reel handling requirements if applicable. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm pinout and electrical specifications before integration.

Selection Notes

Select this component for single-ended input applications requiring direct voltage-to-frequency conversion. It is suitable where ratiometric measurement against an internal or external reference is needed. Consider the maximum output frequency limits relative to the system clock when designing counter-based readout circuits. Evaluate power-down requirements for battery-operated systems.

Part Context

This part belongs to the AD7741/AD7742 family of synchronous voltage-to-frequency converters. The AD7741 variant provides a single channel, whereas the AD7742 offers multiple differential inputs. Both share similar architecture but differ in channel count and package options. This specific model is the industrial grade version in surface-mount packaging.

Replacement Considerations

AD7741BN is a DIP-8 alternative with identical electrical characteristics. AD7741YR is the automotive grade version with extended temperature range. Verify pin compatibility and thermal performance when substituting.