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Frequency-to-voltage converters are electronic devices used to provide analog output voltage, which is a function of input signal.
Structure
Generally frequency-to-voltage converter consists of operational amplifier, resistor & capacitor, etc.
Working
Initially, operational amplifier performs simple linear signal processing operation while resistor-capacitor (RC) network removes frequency-dependent ripples. Electronic devices such as encoders, tachometers, timers, relays and switches send AC and DC voltages frequencies, pulses, and other specialized waves to frequency-to-voltage converter. Among these signals, some signals are allowed to pass while remaining signals are attenuated by the filters. To be precise, usually, low pass filters are used in a circuit to pass signals that fall below cutoff frequency, and to block signals that exceed the threshold frequency. Modern day frequency-to-voltage converters use programmable filters for filtering unwanted signals.
Frequency-to-voltage converters are available in a several form factors. Some devices mount on integrated circuits (ICs), standard DIN rails, or printed circuit boards (PCBs) that attach to enclosures or plug into computer backplanes. Benchtop or freestanding frequency-to-voltage converters are available with full casings or cabinets and integral interfaces.
Specifications
Device specifications for frequency-to-voltage converters include the number of analog channels, number of differential channels, include maximum output voltage, accuracy, and signal isolation. In case of single-ended outputs, specifications include maximum output voltage, accuracy, signal isolation and maximum number of analog channel outputs as twice the number of differential outputs.
Example
Specification for frequency-to-voltage converter LM2907
Supply Voltage 28V
Supply Current (Zener Options) 25 mA
Collector Voltage 28V
Differential Input Voltage
Tachometer 28V
Op Amp/Comparator 28V
Input Voltage Range
Tachometer
LM2907-8, LM2917-8 ±28V
LM2907, LM2917 0.0V to +28V
Op Amp/Comparator 0.0V to +28V
Operating Temperature Range -40°C to +85°C
Storage Temperature Range -65°C to +150°C
Soldering Information
Dual-In-Line Package
Soldering (10 seconds) 260°C
Small Outline Package
Vapor Phase (60 seconds) 215°C
Infrared (15 seconds) 220°C
Applications
Frequency-to-voltage converters are used in a various industries and applications. Some of its applications are as follows:
- Frequency-to-voltage converters are used in vehicle-monitoring applications to analyze the response times of clutches, air-conditioning compressors, and anti-lock braking systems.
- Frequency-to-voltage converters are also used in driveline analysis, to monitor and control engine speeds.
- In addition, frequency-to-voltage converters are used in flowmeter monitoring, machine analysis and control, and response time evaluation.
Other types of applications includes:
- Over/under speed sensing
- Frequency to voltage conversion (tachometer)
- Speedometers
- Breaker point dwell meters
- Automotive door lock control
- Touch or sound switches
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