Voltage-to-Frequency And Frequency-to-Voltage Converter

The AD652 Synchronous Voltage-to-Frequency Converter (SVFC) is a powerful building block for precision Analog-to-digital conversion, offering typical nonlinearity of 0. 002% (0. 005% maximum) at a 100 kHz output frequency. The inherent monotonicity of the transfer function and wide range of Clock frequencies allows the conversion time and resolution
Voltage-to-Frequency And Frequency-to-Voltage Converter - schematic

to be optimized for specific applications. The AD652 uses a variation of the popular charge-balancing technique to perform the conversion function. The AD652 uses an external Clock to define the full-scale output frequency, rather than relying on the stability of an external capacitor. The result is a more stable, more linear transfer function, with significant application benefits in both single and multichannel systems. Gain drift is minimized using a precision low drift reference and low TC on-chip thin-film scaling resistors. Furthermore, the initial gain error is reduced to less than 0. 5% by the use of laser-wafer-trimming. The Analog and digital sections of the AD652 have been designed to allow operation from a single-ended power source, simplifying its use with isolated power supplies. The AD652 is available in five performance grades. The 20-pin PLCC packaged JP and KP grades are specified for operation over the 0C to +70C commercial temperature range. The 16- pin cerdip-packaged AQ and BQ grades are specified for operation over the -40C to +85C industrial temperature range, and the AD652SQ is available for operation over the full -55C to +125C extended temperature range.

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