AD7740YRTZ-REEL7

Overview

The AD7740YRTZ-REEL7 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 in normal mode. The device features an internal 2.5 V bandgap reference and supports a maximum input frequency of 1 MHz. Integral Nonlinearity is specified at ±0.012% of span in unbuffered mode. It is housed in an 8-lead SOT-23 package and is guaranteed for the automotive temperature range of –40 °C to +105 °C.

Feature Summary

• Synchronous operation where full-scale output frequency is defined by an external system clock signal or crystal.
• Selectable high impedance buffered input mode or unbuffered mode allowing analog input below ground potential.
• Integrated automatic power-down function triggered by inactive clock input to minimize power consumption.
• Requires minimal external components with no trimming or calibration needed for frequency setting.

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 that the specific Y-grade suffix corresponds to the required automotive temperature range of –40 °C to +105 °C. Confirm the REEL7 packaging designation matches the intended surface-mount assembly process. Ensure the order includes the correct RoHS-compliant variant if environmental regulations apply to the final product deployment.

Selection Notes

Select this component when space constraints require an 8-lead SOT-23 package. Choose the Y-grade version specifically for automotive environments requiring extended temperature coverage. Consider the buffered versus unbuffered input modes based on source impedance requirements and whether negative voltage inputs are necessary for the application design.

Part Context

This part belongs to the AD7740 family of synchronous voltage-to-frequency converters. It is designed as a cost-effective alternative to discrete solutions, offering significant space savings. The Y-grade designation distinguishes it from the commercial K-grade version by its wider operating temperature range suitable for automotive use.

Replacement Considerations

The AD7740KRMZ-REEL7 is a confirmed substitute within the same family but is rated for the commercial temperature range of 0 °C to 85 °C rather than the automotive range.