3-290

TELCOM SEMICONDUCTOR, INC.

Pin No.

Symbol

Description

See text.

2

Zero Adj

Low frequency adjustment input. See text.

Input current connection for the V/F converter.

Negative power supply voltage connection, typically – 5V.

Reference capacitor connection.

6

GND

Analog ground.

Voltage reference input, typically – 5V.

8

Pulse Freq Out

Frequency output. This open drain output will pulse LOW each time the Freq

threshold detector limit is reached. The pulse rate is proportional to input voltage.

9

Output Common

Source connection for the open drain output FETs. See text.

10

Freq/2 Out

This open drain output is a square wave at one half the frequency of the pulse

output (pin 8). Output transitions of this pin occur on the rising edge of pin 8.

11

Threshold Detect

Input to the threshold detector. This pin is the frequency input during F/V operation.

12

Amplifier Out

Output of the integrator amplifier.

13

NC

No internal connection

14

Positive power supply connection, typically +5V.

PIN DESCRIPTIONS

PIN CONFIGURATIONS

1

2

3

4

5

6

7

14

13

12

11

10

9

8

VDD

NC

AMPLIFIER OUT

THRESHOLD DETECTOR

FREQ/2 OUT

OUTPUT COMMON

PULSE FREQ OUT

IBIAS

ZERO ADJ

IIN

VSS

VREF OUT

GND

VREF

1

2

3

4

5

6

7

14

13

12

11

10

9

8

VDD

NC

AMPLIFIER OUT

THRESHOLD DETECTOR

FREQ/2 OUT

OUTPUT COMMON

PULSE FREQ OUT

IBIAS

ZERO ADJ

I

IN

V

SS

V

REF

OUT

GND

V

REF

TC9400

TC9401

TC9402

TC9400

TC9401

TC9402

NC = NO INTERNAL CONNECTION

14-Pin Plastic DIP/CerDIP

14-Pin SOIC (Narrow)

VOLTAGE-TO-FREQUENCY/

FREQUENCY-TO-VOLTAGE CONVERTERS

TC9400

TC9401

TC9402