Fairchild RC4152 service manual

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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-to­frequency converter. Circuits that convert a DC voltage to a
pulse train can be built by adding a few resistors and capaci­tors to the internal comparator, one-shot, voltage reference,
and switched current source. Frequency-to-voltage convert­ers (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

Source Output

Switched

Reference

Output

Open Collector

Output

Ground

1

2

3

4

Switched

Current
Source

Switched

Voltage

Reference

Open Collector

Logic Output

Transistor

4152

Precision
One Shot

Voltage

Reference

Open Loop

Comparator

4152-01

8

7

6

5

-V

S

Comparator
Inputs

One Shot
Timing

Rev. 1.0.1

PRODUCT SPECIFICATION RC4152

Pin Assignments Pin Descriptions

Pin Function

I

OUT

R

F

OUT

GND

1

2

S

3

4

8

7

6

5

4152-02

+V

V

V

C

S

IN

TH

O

1 Switched Current Source Output (I
2 Switched Voltage Reference (RS)
3 Logic Output (Open Collector) (F
4 Ground (GND)
5 One-Shot R, C Timing (CO)

OUT

6 Threshold (VTH)
7 Input Voltage (VlN)
8+V

S

Absolute Maximum Ratings

Parameter Min. Typ. Max. Units

Supply Voltage +22 V
Internal Power Dissipation 500 mW
Input Voltage -0.2 +V
Output Sink Current

(Frequency Output)
Output Short Circuit to Ground Continuous
Storage Temperature Range -65 +150 °C
Operating Temperature Range
RC4152 0 +70 °C
RV4152N -25 +85 °C

Note:

1. “Absolute maximum ratings” are those beyond which the safety of the device cannot be guaranteed. They are not meant to
imply that the device should be operated at these limits. If the device is subjected to the limits in the absolute maximum ratings
for extended periods, its reliability may be impaired. The tables of Electrical Characteristics provides conditions for actual
device operation.

S

20 mA

OUT

)

)

V

Thermal Characteristics

8-Lead Plastic DIP Small Outline SO-8

Max. Junction Temp. +125°C +125°C
Max. P
Therm. Res q
Therm. Res q
For TA>50°C Derate at 6.25 mW/°C 4.17mW/°C

2

<50°C 468 mW 300mW

D TA

JC
JC

——

160°C/W 240°C/W

RC4152 PRODUCT SPECIFICATION

Electrical Characteristics

(VS = +15V, and TA = +25°C unless otherwise noted)

Parameters Test Conditions Min. Typ. Max. Units
Power Supply Requirements (Pin 8)
Supply Current VS = +15V 2.5 6.0 mA

Supply Voltage +7.0 +15 +18 V

Input Comparator (Pins 6 and 7)

V

OS

Input Bias Current -50 -300 nA
Input Offset Current ±30 ±100 nA
Input Voltage Range 0 VS-2 VS-3 V

One Shot (Pin 5)

Threshold Voltage 0.65 0.67 0.69 V
Input Bias Current -50 -500 nA
Saturation Voltage I = 2.2 mA 0.1 0.5 V
Drift of Timing vs. Temperature

2

T = 75 ms over the specified
temperature range

Timing Drift vs. Supply Voltage ±100 ppm/V

Switched Current Source (pin 1)

1

Output Current RS = 16.7K +138 mA
Drift vs. Temperature

2

over specified temperature range ±50 ±100 ppm/°C
Drift vs. Supply Voltage 0.10 %/V
Leakage Current Off State 1.0 50 nA
Compliance Pin 1 = 0V to +10V 1.0 2.5 mA

Reference Voltage (Pin 2)

V

REF

Drift vs. Temperature

Logic output (Pin 3)

Saturation Voltage

2

over specified temperature range ±50 ±100 ppm/°C

I

= 3 mA 0.1 0.5 V

SINK

I

= 10 mA 0.8 V

SINK

2.0 2.25 2.5 V

Leakage Current Off State 0.1 1.0 mA

Nonlinearity Error

(Voltage Sourced Circuit of Figure 3) 1.0 Hz to 10 kHz 0.007 0.05 %

Temperature Drift Voltage2

(Voltage Sourced Circuit of Figure 3)

Notes:

1. Temperature coefficient of output current source (pin 1 output) exclusive of reference voltage drift.

2. Guaranteed but not tested.

F

= 10 kHz,

OUT

over specified temperature range ±75 ±150 ppm/°C

±2.0 ±10 mV

S

±30 ±50 ppm/°C

3

PRODUCT SPECIFICATION RC4152

Typical Performance Characteristics

10 KHz Current-Sourced VFC

Nonlinearity vs. Input Voltage

+0.01

+0.005

0

-0.005

NL (% Error)

-0.01

-0.015
1

0

+0.01

+0.005

0

-0.005

NL (% Error)

-0.01

2345678910

(V)

V

IN

10 KHz Voltage-Sourced VFC

Nonlinearity vs. Input Voltage

+0.06

+0.03

0

-0.03

NL (% Error)

-0.06

-0.09
0

+0.10

+0.05

0

-0.05

NL (% Error)

-0.10

100 KHz Current-Sourced VFC

Nonlinearity vs. Input Voltage

1

2345678910

V

(V)

IN

100 KHz Voltage-Sourced VFC

Nonlinearity vs. Input Voltage

-0.015
0

+0.01

+0.005

0

-0.005

NL (% Error)

-0.01

-0.015
0

1

2345678910

(V)

V

IN

10 KHz Precision VFC

Nonlinearity vs. Input Frequency

1

2345678910

F

(kHz)

IN

-0.15
0

+0.12

+0.08

+0.04

0

NL (% Error)

-0.04

-0.08
0

1

2345678910

(V)

V

IN

100 KHz Precision VFC

Nonlinearity vs. Input Frequency

1

2345678910

F

(kHz)

IN

4152-03

4