Part # AD652 datasheet

Part Manufacturer: Analog Devices

Analog Devices

Part Description: AD652 Monolithic Synchronous Voltage-to-Frequency Converter Data Sheet (Rev. C)


Part Details:

Monolithic Synchronous Voltage-to-Frequency Converter AD652 FEATURES The AD652 is available in five performance grades. The 20-lead Full-scale frequency (up to 2 MHz) set by external system PLCC-packaged JP and KP grades are specified for operation clock over the 0°C to +70°C commercial temperature range. The Extremely low linearity error (0.005% max at 1 MHz FS, 16-lead CERDIP-packaged AQ and BQ grades are specified for 0.02% max at 2 MHz FS) operation over the -40°C to +85°C industrial temperature No critical external components required range. The AD652SQ is available for operation over the full Accurate 5 V reference voltage -55°C to +125°C extended temperature range. Low drift (25 ppm/°C max) Dual- or single-supply operation PRODUCT HIGHLIGHTS Voltage or current input 1. The use of an external clock to set the full-scale frequency MIL-STD-883 compliant versions available allows the AD652 to achieve linearity and stability far superior to other monolithic VFCs. By using the same clock PRODUCT DESCRIPTION to drive the AD652 and set the counting period (through a The AD652 synchronous voltage-to-frequency converter suitable divider), conversion accuracy is maintained (SVFC) is a powerful building block for precision analog-to- independent of variations in clock frequency. digital conversion, offering typical nonlinearity of 0.002% 2. The AD652 synchronous VFC requires only one external (0.005% maximum) at a 100 kHz output frequency. The inher- component (a noncritical integrator capacitor) for ent monotonicity of the transfer function and wide range of operation. clock frequencies allow the conversion time and resolution to be optimized for specific applications. 3. The AD652 includes a buffered, accurate 5 V reference. The AD652 uses a variation of the charge-balancing technique 4. The AD652 s clock input is TTL and CMOS compatible and to perform the conversion function. The AD652 uses an can also be driven by sources referred to the negative power external clock to define the full-scale output frequency, rather supply. The flexible open-collector output stage provides than relying on the stability of an external capacitor. The result sufficient current sinking capability for TTL and CMOS is a more stable, more linear transfer function, with significant logic, as well as for optical couplers and pulse transformers. application benefits in both single- and multichannel systems. A capacitor-programmable one-shot is provided for selec-tion of optimum output pulse width for power reduction. Gain drift is minimized using a precision low drift reference 5. The AD652 can also be configured for use as a synchronous


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AD652.pdf Datasheet