AD7740YRMZ-REEL7

Overview

The AD7740YRMZ-REEL7 is a synchronous Voltage-to-Frequency Converter (VFC) from Analog Devices, housed in an 8-lead MSOP package. It operates on a single supply ranging from 3.0 V to 5.25 V 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. Integral Nonlinearity is specified at ±0.012% of span in unbuffered mode. It guarantees operation within the automotive temperature range of -40°C to +105°C.

Feature Summary

• Synchronous operation where output frequency is defined by an external clock source or crystal.
• True bipolar input capability allowing analog signals down to -150 mV without charge pumps.
• Selectable high impedance buffered input for minimal loading of signal sources.
• Automatic power-down mode triggered by inactive clock inputs to reduce consumption.

Applications

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

Procurement Notes

Verify the specific suffix REEL7 corresponds to the required tape and reel packaging configuration for automated assembly. Confirm that the Y grade designation meets the mandatory -40°C to +105°C automotive operating temperature requirements for your design. Ensure the MSOP-8 footprint matches your PCB layout constraints before finalizing procurement.

Selection Notes

Select this component when a low-cost, space-saving VFC solution is required for single-supply systems. It is suitable for designs needing ratiometric measurement capabilities using the internal reference. Consider the buffered versus unbuffered input modes based on source impedance requirements and whether negative voltage inputs are necessary for the application.

Part Context

This part belongs to the AD7740 series of synchronous voltage-to-frequency converters. It is designed as a cost-effective alternative to traditional capacitor-based VFCs, offering improved stability through clock synchronization. The Y-grade variant specifically targets industrial and automotive environments requiring extended temperature performance compared to commercial grades.

Replacement Considerations

Public confirmed substitute part numbers: AD7740KRMZ-REEL7.