AD7741YRZ

Overview

The AD7741YRZ is a single-channel synchronous voltage-to-frequency converter manufactured by Analog Devices Inc. It operates from a single +5 V supply (4.75 V to 5.25 V) and features an on-chip +2.5 V bandgap reference. The device utilizes a charge-balance conversion technique with a buffered analog input. Key electrical parameters include an integral nonlinearity of 0.012% at fCLKIN = 3 MHz, a typical normal mode current consumption of 6 mA, and a maximum output frequency of 0.45 fCLKIN. It supports clock frequencies up to 6.144 MHz and operates within a temperature range of -40°C to +105°C.

Feature Summary

• Synchronous voltage-to-frequency conversion using a charge-balance technique for high linearity.
• Integrated +2.5 V bandgap reference with option for external overdrive.
• Buffered analog input stage providing high impedance and minimal loading.
• Power-down capability to reduce standby current consumption.

Applications

• Low cost analog-to-digital conversion systems
• Signal isolation applications

Procurement Notes

Verify the specific Y suffix indicates the extended industrial temperature range (-40°C to +105°C) compared to the B version. Confirm the R-8 package designation matches the required surface-mount footprint. Ensure the master clock source meets the CMOS compatibility requirements for the CLKIN pin. Check for any obsolescence notices or lifecycle status changes directly from the manufacturer.

Selection Notes

Select this component when a single-ended voltage input requires conversion to a frequency domain with high accuracy. The integrated reference simplifies design by reducing external component count. Consider the power-down feature for battery-operated systems requiring low standby currents. Verify that the required resolution and gate time align with the available clock frequencies.

Part Context

The AD7741 is part of the AD7741/AD7742 family of synchronous voltage-to-frequency converters. While the AD7742 offers multiple differential or pseudo-differential channels in a 16-lead package, the AD7741 provides a simplified single-channel solution in an 8-lead SOIC or DIP package. Both share similar core architecture and performance characteristics.

Replacement Considerations

The AD7741BRZ is the equivalent part with an industrial temperature range of -40°C to +85°C. Other members of the AD774x family may offer different channel counts but require verification of pinout and functional compatibility.