TC7107ACLW Microchip Technology, TC7107ACLW Datasheet - Page 19

• Manufacturer Part Number: TC7107ACLW
• Description: IC ADC 3 1/2DGT LED DVR 44-PLCC
• Manufacturer: Microchip Technology

Specifications of TC7107ACLW

• Display Type: LED
• Configuration: 7 Segment
• Digits Or Characters: A/D 3.5 Digits
• Current - Supply: 800µA
• Voltage - Supply: 5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-PLCC
• Resolution (bits): 3.5bit
• Input Channel Type: Differential
• Data Interface: Parallel
• Supply Voltage Range - Analog: 5V
• Supply Current: 800µA
• Digital Ic Case Style: LCC
• No. Of Pins: 44
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

In addition to limiting maximum power dissipation, the
resistor reduces the change in power dissipation as the
display changes. This effect is caused by the fact that,
as 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 230 mW, while
a circuit without the resistor will change about 470 mW.
Therefore, the resistor will reduce the effect of display
dissipation on reference voltage drift by about 50%.
The change in LED brightness caused by the resistor is
almost unnoticeable as more segments turn off. If
display brightness remaining steady is very important
to the designer, a diode may be used instead of the
resistor.
FIGURE 9-4:
Package Power Dissipation.
© 2008 Microchip Technology Inc.
TP5
40
100
kΩ
1
5.1 Ω 1/4W
100 pF
1N4001
24 kΩ
TP1
TP2
1 kΩ
+5V
0.1
µ
F
1 MΩ
TP3
TC7107A
Diode or Resistor Limits
+
10
Display
0.01
µ
IN
F
30
–
kΩ
0.47
47
µ
F
TP
0.22
4
µ
F
-5V
Display
20
21
150Ω
TC7106/A/TC7107/A
DS21455D-page 19