tc7107a Microchip Technology Inc., tc7107a Datasheet - Page 7

• Manufacturer Part Number: tc7107a
• Description: 3-1/2 Digit Analog-to-digital Converters
• Manufacturer: Microchip Technology Inc.

TABLE 2-1:
© 2006 Microchip Technology Inc.
(40-Pin PDIP)
Pin Number
Normal
36
37
38
39
40
(40-Pin PDIP)
(Reversed
PIN FUNCTION TABLE (CONTINUED)
Pin No.
(5)
(4)
(3)
(2)
(1)
Symbol
V
OSC3
OSC2
OSC1
TEST
REF
+
The analog input required to generate a full scale output (1999 counts). Place 100mV
between Pins 35 and 36 for 199.9mV full scale. Place 1V between Pins 35 and 36 for
2V full scale. See paragraph on Reference Voltage.
Lamp test. When pulled HIGH (to V+) all segments will be turned on and the display
should read -1888. It may also be used as a negative supply for externally generated
decimal points. See paragraph under TEST for additional information.
See Pin 40.
See Pin 40.
Pins 40, 39, 38 make up the oscillator section. For a 48kHz clock (3 readings per
section), connect Pin 40 to the junction of a 100kΩ resistor and a 100pF capacitor.
The 100kΩ resistor is tied to Pin 39 and the 100pF capacitor is tied to Pin 38.
TC7106/A/TC7107/A
Description
DS21455C-page 7