AD654
FEATURES
Low Cost Single or Dual Supply, 5 V to 36 V, ؎5 V to ؎18 V Full-Scale Frequency Up to 500 k Hz Minimum Number of External ponents Needed Versatile Input Amplifier
Positive or Negative Voltage Modes Negative Current Mode High Input Impedance, Low Drift Low Power: 2.0 m A Quiescent Current Low Offset: 1 m V
Low Cost Monolithic Voltage-to-Frequency Converter
FUNCTIONAL BLOCK DIAGRAM
+VS
- VS
DRIVER
FOUT
LOGIC MON
4 +VIN
PRODUCT DESCRIPTION
The AD654 is a monolithic V/F converter consisting of an input amplifier, a precision oscillator system, and a high current output stage. A single RC network is all that is required to set up any full scale (FS) frequency up to 500 k Hz and any FS input voltage up to ± 30 V. Linearity error is only 0.03% for a 250 k Hz FS, and operation is guaranteed over an 80 d B dynamic range. The overall temperature coefficient (excluding the effects of external ponents) is typically ± 50 ppm/°C. The...
