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PDF RC4152 Data sheet ( Hoja de datos )

Número de pieza RC4152
Descripción Voltage-to-Frequency Converters
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo



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No Preview Available ! RC4152 Hoja de datos, Descripción, Manual

RC4152
Voltage-to-Frequency Converters
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
Switched
Current 1
Source Output
Switched
Reference 2
Output
Open Collector
Output
3
Ground 4
4152
Switched
Current
Source
Switched
Voltage
Reference
Voltage
Reference
8 -VS
Open Loop
Comparator
7
Comparator
Inputs
Precision
One Shot
Open Collector
Logic Output
Transistor
6
One Shot
5 Timing
4152-01
Rev. 1.0.1

1 page




RC4152 pdf
RC4152
PRODUCT SPECIFICATION
Principles of Operation
The RC4152 contains the following components: an open
loop comparator, a precision one-shot timer, a switched volt-
age reference, a switched current source, and an open collec-
tor logic output transistor. These functional blocks are
internally interconnected. Thus, by adding some external
resistors and capacitors, a designer can create a complete
voltage-to-frequency converter.
The comparator’s output controls the one-shot (monostable
timer). The one-shot in turn controls the switched voltage
reference, the switched current source and the open collector
output transistor. The functional block diagram shows the
components and their interconnection.
To detail, if the voltage at pin 7 is greater than the voltage at
pin 6, the comparator switches and triggers the one-shot.
When the one-shot is triggered, two things happen. First, the
one-shot begins its timing period. Second, the one-shot’s
output turns on the switched voltage reference, the switched
current source and the open collector output transistor.
The one-shot creates its timing period much like the popular
555 timer does, by charging a capacitor from a resistor tied
to +VS. The one-shot senses the voltage on the capacitor
(pin 5) and ends the timing period when the voltage reaches
2/3 of the supply voltage. At the end of the timing period, the
capacitor is discharged by a transistor similar to the open
collector output transistor.
Meanwhile, during the timing period of the one-shot, the
switched current source, the switched voltage reference, and
the open collector output transistor all will be switched on.
The switched current source (pin 1) will deliver a current
proportional to both the reference and an external resistor,
RS. The switched reference (pin 2) will supply an output
voltage equal to the internal reference voltage (2.25V). The
open collector output transistor we be turned on, forcing the
logic output (pin 3) to a low state. At the end of the timing
period all of these outputs will turn off. The switched voltage
reference has produced an off-on-off voltage pulse, the
switched current source has emitted a quanta of charge, and
the open collector output has transmitted a logic pulse.
To summarize, the purpose of the circuit is to produce a cur-
rent pulse, well-defined in amplitude and duration, and to
simultaneously produce an output pulse which is compatible
with most logic families. The circuit's outputs show a pulse
waveform in response to a voltage difference between the
comparators inputs.
Integrator
CB
RB
I OUT
1
RS
Current Setting Resistor
RS = 16.7K
2
3
R LOAD
Open Collector Output
Ground
4
FOUT
4152
Switched
Current
Source
Switched
Voltage
Reference
Voltage
Reference
8
Open Loop
Comparator
7
Precision
One Shot
Open Collector
Logic Output
Transistor
6
5
Figure 1. Single Supply VFC
+VS
100K
0.01 mF
VIN
0 to +10V
RO
One Shot
Timing
CO
4152-04
5

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RC4152 arduino
RC4152
Notes:
PRODUCT SPECIFICATION
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