VFC101

The VFC101 voltage-to-frequency converter uses the proven charge-balance technique with internal digital logic to control the critical reference integration period. Reference timing is derived from an external clock signal which accurately sets the full-scale frequency. This technique eliminates the errors and drift from external timing components which are required with other VFCs.

Internal resistors provide accurate full-scale input ranges of 5V, 8V or 10V inputs without external resistors or trimming. An accurate 5V reference voltage output is useful for bridge or sensor excitation. With simple pin interconnections, VFC101 can provide halfscale offset to allow bipolar input voltages.

The open-collector frequency output interfaces easily to CMOS or TTL circuitry. Output one-shot circuitry may be used to optimize the output pulse width for optical couplers or transformers.The VFC101 is packaged in a surface-mount 20-pin PLCC (plastic leaded chip carrier) package.