Datasheet KA331 Datasheet (Fairchild Semiconductor)

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

Typical Applications

KA331

Figure 1. Precision Voltage-to-Frequency Converter, 100KHz Full-Scale

Figure 2. Simple Frequency-to-Voltage Converter, 10KHz Full-Scale

Figure 3. Light Inte nsity to Freq uency Convert er

3

KA331

Mechanical Dimensions

Package

6.40

±0.20

±0.008

0.252

8-DIP

Dimensions in millimeters

0.79

0.031

()

±0.10

±0.004

±0.10

±0.004

#1

#8

#4 #5

7.62

0.300

MAX

9.60

0.378

5.08

0.200

3.40

0.134

±0.20

9.20

MAX

±0.20

±0.008

±0.008

0.362

0.33

0.013

MIN

0.46

3.30

0.130

2.54

±0.30
±0.012

0.018

0.100

1.524

0.060

+0.10

0.25

–0.05

+0.004

0.010

–0.002

0~15°

4

Ordering Information

Product Number Package Operating Temperature

KA331 8-DIP 0 ~ + 70°C

KA331

5

KA331

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURT HER NOTICE TO ANY
PRODUCTS HEREI N TO IMPROVE RELIABILITY, FUNCTIO N OR DESIGN. FAIRCH IL D DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER IT S PATENT RIGHTS, NOR THE RIGHTS OF OTHE RS.

LIFE SUPPORT POL I CY

FAIRCHILD’S PR ODUCTS ARE NOT AUTH ORIZED FOR USE AS C RITICAL COMPONENT S IN LIFE SUPPORT DE VICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein :

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with

2. A critical component in any component of a life support
device or sy stem whose fai lure to perform can be
reasonably expec ted to cause the failur e of the life support
device or system, or to affect its safety or effec t iv ene ss .

instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.

www.fairchildsemi.com

5/22/01 0.0m 001

 2001 Fairchild Semiconductor Corporation

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