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AD654

Analog Devices
Part Number AD654
Manufacturer Analog Devices
Description Low Cost Monolithic Voltage-to-Frequency Converter
Published Mar 23, 2005
Detailed Description a FEATURES Low Cost Single or Dual Supply, 5 V to 36 V, ؎5 V to ؎ 18 V Full-Scale Frequency Up to 500 kHz Minimum Number...
Datasheet PDF File AD654 PDF File

AD654
AD654

Overview
a FEATURES Low Cost Single or Dual Supply, 5 V to 36 V, ؎5 V to ؎ 18 V Full-Scale Frequency Up to 500 kHz Minimum Number of External Components Needed Versatile Input Amplifier Positive or Negative Voltage Modes Negative Current Mode High Input Impedance, Low Drift Low Power: 2.
0 mA Quiescent Current Low Offset: 1 mV Low Cost Monolithic Voltage-to-Frequency Converter AD654 FUNCTIONAL BLOCK DIAGRAM +VS 8 CT 7 CT 6 –VS 5 DRIVER OSC AD654 1 FOUT 2 LOGIC COMMON 3 RT 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 kHz and any FS input voltage up to ± 30 V.
Linearity error is only 0.
03% for a 250 kHz FS, and operation is guaranteed over an 80 dB dynamic range.
The overall temperature coefficient (excluding the effects of external components) is typically ± 50 ppm/°C.
The AD654 operates from a single supply of 5 V to 36 V and consumes only 2.
0 mA quiescent current.
The low drift (4 µV/° C typ) input amplifier allows operation directly from small signals such as thermocouples or strain gauges while offering a high (250 MΩ) input resistance.
Unlike most V/F converters, the AD654 provides a square-wave output, and can drive up to 12 TTL loads, optocouplers, long cables, or similar loads.
PRODUCT HIGHLIGHTS 2.
A minimum number of low cost external components are necessary.
A single RC network is all that is required to set up any full scale frequency up to 500 kHz and any full-scale input voltage up to ± 30 V.
3.
Plastic packaging allows low cost implementation of the standard VFC applications: A/D conversion, isolated signal transmission, F/V conversion, phase-locked loops, and tuning switched-capacitor filters.
4.
Power supply requirements are minimal; only 2.
0 mA of quiescent current is drawn from the single positive supply from 4.
5 volts to 36 volts.
In t...


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