Fairchild Semiconductor KA331 Datasheet

KA331

V-F Converter

www.fairchildsemi.com

Features

• Guaranteed linearity: 0.01% max.

• Low power dissipation: 15mW at 5V

• Wide range of full scale frequency: 1Hz to 100KHz

• Pulse output compatible with all logic forms

• Wide dynamic range: 100dB min at 10KHz full scale
frequency

Internal Block Diagram

Description

This voltage to frequency converter provides the output
pulse train at a frequency precisely proportional to the
applied input voltage. The KA331 can operate at power
supplies as low as 4.0V and be changed output frequency
from 1Hz to 100KHz. It is ideally suited for use in simple
low-cost circui t fo r anal og-to digi tal conver sio n, long ter m
integration, linear frequency modulation or demodulation,
frequency-to-voltage conversion, and many other functions.

8-DIP

1

©2001 Fairchild Semiconductor Corporation

Rev. 1.0.0

KA331

Absolute Maximum Ratings (TA = 25°°°°C)

Parameter Symbol Value Unit

Supply Voltage V
Input Voltage V
Operating Temperature Range T
Power Dissipation P

Electrical Characteristics

Parameter Symbol Conditions Min. Typ. Max. Unit

VFC Non-Linearity VFCNL 4.5 ≤ V
Conversion Accuracy Scale Factor ACCUR V

∆G/V

Chang Of Gain With V

CC

V

CC

CC

Rated Full - Scale Frequency f V

INPUT COMPARATOR

Offset Voltage V
Bias Current I
Offset Current I
Common-Mode Range V

IO

BIAS

IO
CM

TIMER (PIN 5)

Timer Threshold Voltage V
Input Bias Current I

Saturation Voltage V

TH

BIAS

SAT

CURRENT SOURCE (PIN 1)

Output Current I
Change with Voltage ∆I
Current Source Off Leakage I

O

/∆V

O

LKG

1

REFERENCE VOLTAGE (PIN 2)

Reference Voltage V
Stability vs Temperature ST
Stability vs Time, 1000Hours ST

REF

T
T

LOGIC OUTPUT (Pin 3)

Saturation Voltage V
Off Leakage I

SAT

LKG

SUPPLY CURRENT

Supply Current I

CC

= -10V, RS = 14KΩ 0.90 1.00 1.10 KHz/V

I

4.5V ≤ V
10V ≤ V

= -10V 10.0 - - KHz

I

0°C ≤ T

0°C ≤ T

VCC = 15V,
0V ≤ V

V

= 10V - 200 1000 nA

5

I = 5mA - 0.22 0.5 V

RS = 14KΩ, V1 = 0V 116 136 156 µA
0V ≤ V

I = 5mA - 0.15 0.50
I = 3.2mA - 0.10 0.40

VCC = 5V 1.5 3.0 6.0
V

CC

CC

I

OPR

D

≤ 20V - ±0.003 ±0.01 % Full-Scale

CC

≤ 10V - 0.01 0.1 %/V

CC

≤ 40V - 0.006 0.06

CC

≤ +70°C-±3 ±10 mV

A

40 V

-0.2 ~ + V

CC

0 ~ +70 °C

500 mW

- - -80 -300 nA

--±8 ±100 nA
≤ +70°C-0.2-V

A

-2.0 V

CC

- 0.63 0.667 0.701 ×V

≤ 9.9V

5

≤ 10V - 0.2 1.0 µA

1

- ±10 ±100 nA

- - 0.02 10.0 nA

- 1.70 1.89 2.08 V

--±60 - ppm/°C

--±0.1 - %

--±0.05 1.0 µA

= 40V 2.0 4.0 8.0

V

CC

DC

V

mA

2