AD7740YRMZ-REEL

Overview

The AD7740YRMZ-REEL is a low-cost, ultrasmall synchronous Voltage-to-Frequency Converter (VFC) from Analog Devices. It operates from a single 3.0 V to 5.25 V supply and consumes typically 0.9 mA. The device features an internal 2.5 V bandgap reference and supports full-scale frequencies up to 1 MHz set by an external clock or crystal. It offers selectable high-impedance buffered input or true bipolar operation with -150 mV capability. Integral Nonlinearity is specified at +/- 0.012% FSR in unbuffered mode. The component is housed in an 8-lead MSOP package and is guaranteed for the automotive temperature range of -40°C to +105°C.

Feature Summary

• Synchronous operation where output frequency is defined by an external master clock signal or crystal oscillator.
• Selectable input modes allowing either high-impedance buffering or true bipolar input capability extending below ground.
• Integrated 2.5 V bandgap voltage reference that can be overdriven by an external precision source.
• Automatic power-down functionality triggered by inactive clock signals to minimize energy consumption.

Applications

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

Procurement Notes

Verify the specific Y-grade suffix ensures compliance with the extended automotive temperature range of -40°C to +105°C. Confirm the REEL packaging designation matches automated surface-mount assembly requirements. Cross-reference the RoHS compliance status with current environmental regulations. Ensure the ordering information aligns with the 8-lead MSOP physical footprint for PCB layout compatibility.

Selection Notes

Select this component when a compact, low-power solution for voltage-to-frequency conversion is required. The Y-grade variant is necessary for environments requiring operation beyond standard commercial temperatures. Consider the buffered versus unbuffered input modes based on source impedance and voltage range constraints. Evaluate the need for an external clock source versus an onboard crystal oscillator for system stability.

Part Context

This part belongs to the AD7740 family of synchronous voltage-to-frequency converters manufactured by Analog Devices. It is designed as a cost-effective alternative to traditional asynchronous VFCs, offering improved stability through clock synchronization. The device complements other data converter ICs by providing a simple interface for digital counting or isolation barriers.

Replacement Considerations

The AD7740KRMZ-REEL serves as a commercial grade substitute within the same package, though it lacks the extended temperature rating. Verify pinout compatibility between SOT-23 and MSOP variants if package changes are considered.