AD7740YRM-REEL7

Overview

The AD7740YRM-REEL7 is a low-cost, ultrasmall synchronous Voltage-to-Frequency Converter (VFC) from Analog Devices. It operates from a single 3.0 V to 3.6 V or 4.75 V to 5.25 V supply, consuming typically 0.9 mA. The device features an internal 2.5 V bandgap reference and accepts analog inputs from 0 V to VREF, with true -150 mV capability without a charge pump. The full-scale output frequency is set by an external system clock on the CLKIN pin, supporting frequencies up to 1 MHz. It is available in an 8-lead MSOP package.

Feature Summary

• Synchronous operation where the full-scale output frequency is determined by an external system clock signal applied to the CLKIN pin.
• Integrated 2.5 V bandgap voltage reference that can be overdriven by an external precision reference source.
• Selectable high-impedance buffered input mode for minimal loading or unbuffered mode allowing input voltages below ground.
• Automatic power-down function activated when the clock input remains inactive low for a specified duration.

Applications

• Isolation of high common-mode voltages using opto-isolators
• Low-cost analog-to-digital conversion systems
• Battery monitoring applications
• Automotive sensing environments

Procurement Notes

Verify the specific ordering suffix matches the required temperature grade and packaging format. Confirm the Y-grade designation aligns with automotive temperature range requirements. Ensure the REEL7 suffix corresponds to the intended tape and reel quantity specifications for manufacturing integration.

Selection Notes

Select this component for designs requiring space-saving synchronous VFC solutions. Consider the MSOP package for compact layouts. Evaluate the need for buffered versus unbuffered input modes based on source impedance. Verify compatibility with available clock sources for the desired conversion resolution.

Part Context

This part belongs to the AD7740 family of voltage-to-frequency converters. It shares functional characteristics with other variants in the series but differs in package type and temperature rating. The Y-grade version is specifically qualified for extended automotive operating temperatures compared to commercial grades.

Replacement Considerations

Direct substitutes include AD7740KRMZ-REEL7 for commercial temperature ranges and AD7740YRTZ-REEL7 for SOT-23 packaging. Verify pinout compatibility between MSOP and SOT-23 packages if changing form factors.