Low Cost Monolithic Voltage-to-Frequency Converter

The AD7740 is the world`s smallest, lowest-cost, 12-Bit accurate VFC. Since this is a synchronous converter, the output frequency is related to the fixed master Clock frequency so temperature stability is much improved over asynchronous VFCs. With a 1 MHz input Clock frequency, the FS output frequency is 900 kHz. The Voltage Reference input CAN be
Low Cost Monolithic Voltage-to-Frequency Converter - schematic

tied to the supply, if required. Historically the primary applications for VFCs have been either to implement low cost A/D conversion or to achieve simple isolation. The AD7740 is being offered in an 8-pin MicroSOIC package plus an 8-lead SOT-23 package. The SOT-packaged devices are only available on T&R. Two operating temperature ranges are available; from 0C to +85C and from -40C to +105C.

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