AD7741BNZ

Overview

The AD7741BNZ is a single-channel synchronous voltage-to-frequency converter from Analog Devices. It operates on a single +5 V supply with typical current consumption of 6 mA and power-down mode at 35 mA max. The device features buffered analog inputs, an internal +2.5 V reference, and programmable gain options. It accepts a master clock up to 6 MHz, providing a maximum output frequency of 0.45 fCLKIN. Integral nonlinearity is specified at 0.012% at lower clock frequencies. The component is housed in an 8-lead Plastic DIP package.

Feature Summary

• Synchronous charge-balance conversion technique for high linearity
• On-chip +2.5 V bandgap reference with external override capability
• Buffered analog input stage minimizing source loading effects
• Active low power-down pin for reduced standby current consumption

Applications

• Low cost analog-to-digital conversion systems
• Signal isolation applications using opto-couplers
• Industrial process control signal conditioning
• Frequency-based data transmission links

Procurement Notes

Verify the ordering suffix BNZ corresponds to the -40°C to +85°C industrial temperature range and the N-8 Plastic DIP package configuration. Confirm that the specific revision level matches the design requirements, as specifications are subject to change without notice. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS circuitry.

Selection Notes

Select this component when a single-ended voltage input requires conversion to a frequency domain signal with minimal external components. The AD7741 is suitable for applications requiring inherent monotonicity and noise rejection through integration. Consider the AD7742 if multiple differential or pseudo-differential channels are needed instead of a single channel.

Part Context

The AD7741 belongs to the AD7741/AD7742 family of synchronous voltage-to-frequency converters. These devices utilize a proprietary analog modulator and switched capacitor technique. The AD7741 serves as the single-channel variant, while the AD7742 provides multichannel capabilities. Both share similar core architectures including clock generation and reference circuits.

Replacement Considerations

No public confirmed substitute part numbers are documented in the provided datasheet.