TC9400_06 Datasheet, PDF (6/24 Pages) Microchip Technology – Voltage-to-Frequency/Frequency-to-Voltage Converters

TC9400/9401/9402
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN FUNCTION TABLE
Pin No.
14-Pin PDIP/CERDIP
14-Pin SOIC (Narrow)
Symbol
Description
1
I_BIAS
This pin sets bias current in the TC9400. Connect to V_SS through a 100 kΩ resistor.
2
ZERO ADJ Low frequency adjustment input.
3
I_IN
Input current connection for the V/F converter.
4
V_SS
Negative power supply voltage connection, typically -5V.
5
V_REF OUT
Reference capacitor connection.
6
GND
Analog ground.
7
V_REF
Voltage reference input, typically -5V.
8
PULSE FREQ Frequency output. This open drain output will pulse LOW each time the Freq.
OUT
Threshold Detector limit is reached. The pulse rate is proportional to input voltage.
9
OUTPUT
Source connection for the open drain output FETs.
COMMON
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 Input to the Threshold Detector. This pin is the frequency input during F/V operation.
DETECTOR
12
AMPLIFIER OUT Output of the integrator amplifier.
13
NC
No internal connection.
14
V_DD
Positive power supply connection, typically +5V.
DS21483C-page 6
© 2006 Microchip Technology Inc.