VOLTAGE-TO-FREQUENCY/
FREQUENCY-TO-VOLTAGE CONVERTERS
TC9400
TC9401
TC9402
PIN CONFIGURATIONS
14-Pin Plastic DIP/CerDIP
IBIAS 1
ZERO ADJ 2
IIN 3
VSS 4
VREF OUT 5
GND 6
VREF 7
TC9400
TC9401
TC9402
14 VDD
13 NC
12 AMPLIFIER OUT
11 THRESHOLD DETECTOR
10 FREQ/2 OUT
9
8
OUTPUT COMMON
PULSE FREQ OUT
V
REF
V
14-Pin SOIC (Narrow)
IBIAS
ZERO ADJ
I
IN
1
2
3
4
5
6
7
TC9400
TC9401
TC9402
14
13
12
11
10
9
8
VDD
NC
AMPLIFIER OUT
THRESHOLD DETECTOR
FREQ/2 OUT
OUTPUT COMMON
PULSE FREQ OUT
SS
OUT
GND
V
REF
NC = NO INTERNAL CONNECTION
PIN DESCRIPTIONS
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Symbol
I
BIAS
Zero Adj
I
IN
V
SS
V
REF
OUT
GND
V
REF
Pulse Freq Out
Output Common
Freq/2 Out
Threshold Detect
Amplifier Out
NC
V
DD
Description
This pin sets bias current in the TC9400. Connect to V
SS
through a 100 kΩ resistor.
See text.
Low frequency adjustment input. See text.
Input current connection for the V/F converter.
Negative power supply voltage connection, typically – 5V.
Reference capacitor connection.
Analog ground.
Voltage reference input, typically – 5V.
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.
Source connection for the open drain output FETs. See text.
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.
Input to the threshold detector. This pin is the frequency input during F/V operation.
Output of the integrator amplifier.
No internal connection
Positive power supply connection, typically +5V.
3-290
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
