TC7107 TelCom, TC7107 Datasheet - Page 15

• Manufacturer Part Number: TC7107
• Description: 3-1/2 DIGIT A/D CONVERTERS
• Manufacturer: TelCom

fewer segments are “ON,” each “ON” output drops more
voltage and current. For the best case of six segments (a
“111” display) to worst case (a “1888” display) the resistor
will change about 230mW, while a circuit without the resistor
will change about 470mW. Therefore, the resistor will re-
duce the effect of display dissipation on reference voltage
drift by about 50%.
almost unnoticeable as more segments turn off. If display
brightness remaining steady is very important to the de-
signer, a diode may be used instead of the resistor.
APPLICATIONS INFORMATION
3-1/2 DIGIT A/D CONVERTERS
Figure 15. Diode or Resistor Limits Package Power Dissipation
The change in LED brightness caused by the resistor is
TP5
40
100
k
1
TELCOM SEMICONDUCTOR, INC.
5.1 1/4W
100
pF
1N4001
24k
TP1
TP2
1k
+5V
0.1
F
1 M
TP3
TC7107A
+
DISPLAY
10
0.01
IN
F
30
–
k
0.47
47
F
TP
0.22
4
–5V
F
DISPLAY
20
21
150
APPLICATIONS INFORMATION
Liquid Crystal Display Sources
plays to interface with the TC7106A 3-1/2 digit analog-to-
digital converter.
Manufacturer
Crystaloid
Electronics
AND
Epson
Hamlin, Inc.
Note: 1. Contact LCD manufacturer for full product listing/specifications.
Light Emitting Diode Display Sources
digits with and without decimal point annunciators for the
TC7107A.
Manufacturer
Hewlett-Packard
Components
AND
Several LCD manufacturers supply standard LCD dis-
Several LED manufacturers supply seven segment
Address/Phone
5282 Hudson Dr.
Hudson, OH 44236
216/655-2429
720 Palomar Ave.
Sunnyvale, CA 94086
408/523-8200
3415 Kashikawa St.
Torrance, CA 90505
213/534-0360
612 E. Lake St.
Lake Mills, WI 53551
414/648-2361
Address
640 Page Mill Rd.
Palo Alto, CA 94304
720 Palomar Ave.
Sunnyvale, CA 94086
Part Numbers
C5335, H5535,
T5135, SX440
FE 0201,0701
FE 0203, 2201
FE 0501
LD-B709BZ
LD-H7992AZ
3902, 3933, 3903
Display Type
LED
LED
TC7106A
TC7107A
TC7106
TC7107
3-197
1
1
2
3
4
5
6
7
8