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www.fairchildsemi.com
Features
Single supply operation
Pulse output DTL/TTL/CMOS compatible
Programmable scale factor (K)
High noise rejection
Inherent monotonicity
Easily transmittable output
Simple full scale trim
Single-ended input, referenced to ground
V-F or F-V conversion
Voltage or current input
Wide dynamic range
Applications
Precision voltage-to-frequency converters
Pulse-width modulators
Programmable pulse generators
Frequency-to-voltage converters
Integrating analog-to-digital converters
Long-term analog integrators
Signal conversion:
– Current-to-Frequency
– Temperature-to-Frequency
– Pressure-to-Frequency
– Capacitance-to-Frequency
– Frequency-to-Current
Signal isolation:
– VFC—opto-isolaton—FVC
– ADC with opto-isolation
Signal encoding:
– FSK modulation/demodulation
– Pulse-width modulation
Frequency scaling
DC motor speed control
Description
The RC4152 is a monolithic circuit containing all of the
active components needed to build a complete voltage-to-
frequency converter. Circuits that convert a DC voltage to a
pulse train can be built by adding a few resistors and capaci-
tors to the internal comparator, one-shot, voltage reference,
and switched current source. Frequency-to-voltage convert-
ers (FVCs) and many other signal conditioning circuits are
also easily created using these converters.
The RC4151 was the first monolithic VFC available and
offers guaranteed temperature and accuracy specifications.
The converter is available in a standard 8-pin plastic DIP.
Functional Block Diagram
4152-01
4152
1
2
3
4
5
6
7
8
-V
S
Comparator
Inputs
One Shot
Timing
Switched
Current
Source
Switched
Voltage
Reference
Voltage
Reference
Precision
One Shot
Open Collector
Logic Output
Transistor
Open Loop
Comparator
Switched
Current
Source Output
Switched
Reference
Output
Open Collector
Output
Ground
RC4152
Voltage-to-Frequenc y Converters
Rev. 1.0.1