Precision frequency-to-voltage converters (FVC)s can be made using voltage-to-frequency converters (VFCs). Burr-Brown offers a complete line of precision free-running VFCs. VFC110 High frequency, low jitter VFC 4MHz max full-scale, ±0.02% typ linearity at 2MHz VFC121 Precision single-supply VFC (+4.5V to +36V) 1.5MHz max full-scale, 0.03% max nonlinearity at 100kHz VFC320 Precision VFC 1MHz max full-scale, 0.005% max nonlinearity at 10kHz