AD652BQ

Overview

The AD652BQ is a monolithic synchronous voltage-to-frequency converter (SVFC) designed for precision analog-to-digital conversion. It features an inherent monotonic transfer function and supports full-scale frequencies up to 2 MHz, determined by an external system clock. The device offers extremely low linearity error, specified as a maximum of 0.005% at 1 MHz full scale and 0.02% at 2 MHz full scale. It operates with dual or single supply voltages and accepts either voltage or current inputs.

Feature Summary

• Monolithic synchronous architecture utilizing a phase-locked loop for high linearity
• Extremely low nonlinearity error across wide frequency ranges
• Flexible input configuration supporting both voltage and current signals
• Compliant with MIL-STD-883 standards for ruggedized applications

Applications

• Precision analog-to-digital conversion systems
• High-resolution sensor signal digitization
• MIL-STD-883 compliant instrumentation
• Frequency modulation and pulse generation circuits

Procurement Notes

Verify the specific revision level and manufacturing lot date code when sourcing this component, as Analog Devices may produce variants under different release notes. Confirm that the package type matches the required board layout, typically ceramic dual in-line packages for the BQ suffix. Ensure compatibility with existing clock sources, as the output frequency is directly dependent on the external system clock provided by the user design.

Selection Notes

Select the AD652BQ when application requirements demand superior linearity compared to standard V/F converters. The choice is driven by the need for a synchronous architecture that minimizes drift and noise susceptibility. Consider this part for designs requiring MIL-STD-883 compliance or those operating in environments where temperature stability and low nonlinearity are critical performance factors.

Part Context

Analog Devices manufactures the AD652 series as a dedicated solution for high-performance data acquisition. The AD652BQ represents the military-grade or high-reliability variant within this family. It is positioned alongside other precision analog front-end components, serving as a bridge between analog sensor outputs and digital processing units without requiring external discrete timing components.

Replacement Considerations

The AD652AQ is a commercial grade equivalent within the same functional family. Verify pinout compatibility and check if the lower reliability ratings of the AQ suffix meet the environmental requirements of the target application.