PRODUCT DESCRIPTION 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 inher ent monotonicity of the transfer function and wide range of clock frequencies allow the conversion time and resolution to be optimized for specific applications. FEATURES Full-scale frequency (up to 2 MHz) set by external system clock Extremely low linearity error (0.005% max at 1 MHz FS, 0.02% max at 2 MHz FS) No critical external components required Accurate 5 V reference voltage Low drift (25 ppm/°C max) Dual- or single-supply operation Voltage or current input MIL-STD-883 compliant versions available
* Full-scale frequency (up to 2 MHz) set by external system clock * Extremely low linearity error (0.005% max at 1 MHz FS, 0.02% max at 2 MHz FS) * No critical external components required * Accurate 5 V reference voltage * Low drift (25 ppm/°C max) * Dual- or single-supply operation * Voltage or current input * MIL-STD-883 compliant versions available
The AD652KPZ is a Synchronous Voltage-to-Frequency Converter (SVFC) with a powerful building block for precision analog-to-digital conversion, offering typical nonlinearity of 0.002% (0.005% maximum) at a 100kHz output frequency. The inherent monotonicity of the transfer function and wide range of clock frequencies allows the conversion time and resolution 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.