- 您现在的位置：买卖IC网 > PDF目录98174 > TC7116AIJL 1-CH 13-BIT DUAL-SLOPE ADC, ACCESS, CDIP40 PDF资料下载
参数资料
| 型号： | TC7116AIJL |
| 元件分类： | ADC |
| 英文描述： | 1-CH 13-BIT DUAL-SLOPE ADC, ACCESS, CDIP40 |
| 封装： | CERDIP-40 |
| 文件页数： | 5/17页 |
| 文件大小： | 221K |
| 代理商： | TC7116AIJL |
13
3-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTERS WITH HOLD
TC7116
TC7116A
TC7117
TC7117A
APPLICATIONS INFORMATION
The TC7117/TC7117A sink the LED display current,
causing heat to build up in the IC package. If the internal
voltage reference is used, the changing chip temperature
can cause the display to change reading. By reducing the
LED common anode voltage, the TC7117/TC7117A pack-
age power dissipation is reduced.
Figure 17 is a curve-tracer display showing the relation-
ship between output current and output voltage for typical
TC7117CPL/TC7117ACPL devices. Since a typical LED
has 1.8V across it at 8mA and its common anode is con-
nected to +5V, the TC7117/TC7117A output is at 3.2V (Point
A, Figure 17). Maximum power dissipation is 8.1mA
× 3.2V
× 24 segments = 622mW.
However, notice that once the TC7117/TC7117A's out-
put voltage is above 2V, the LED current is essentially
constant as output voltage increases. Reducing the output
voltage by 0.7V (Point B Figure 17) results in 7.7mA of LED
current, only a 5% reduction. Maximum power dissipation is
now only 7.7mA
× 2.5V × 24 = 462mW, a reduction of 26%.
An output voltage reduction of 1V (Point C) reduces LED
current by 10% (7.3mA), but power dissipation by 38%
(7.3mA
× 2.2V × 24 = 385mW).
Reduced power dissipation is very easy to obtain.
Figure 18 shows two ways: Either a 5.1
, 1/4W resistor, or
a 1A diode placed in series with the display (but not in series
with the TC7117/TC7117A). The resistor reduces the
TC7117/TC7117A's output voltage (when all 24 segments
are ON) to Point C of Figure 17. When segments turn off, the
output voltage will increase. The diode, however, will result
in a relatively steady output voltage, around Point B.
In addition to limiting maximum power dissipation, the
resistor reduces change in power dissipation as the display
changes. The 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 circuit will
change about 230mW, while a circuit without the resistor will
change about 470mW. 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 de-
signer, a diode may be used instead of the resistor.
Figure 15. Recommended Component Values for 2V Full Scale
(TC7116/TC7116A and TC7117/TC7117A)
Figure 16. TC7117/TC7117A Operated from Single +5V Supply
(An External Reference Must Be Used in This
Application.)
100k
100pF
0.047F
470k
0.22F
TO DISPLAY
0.1F
25k
24k
V
+
SET VREF = 1V
0.01F
+
IN
1M
–
V
–
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
TC7116
TC7116A
TC7117
TC7117A
100pF
0.47
F
47k
TO DISPLAY
0.1pF
1k
V
SET VREF= 100mV
+
10k
10k
1.2V
0.01
F
–
IN
1M
+
100k
0.22
F
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
TC9491CZM
TC7117
TC7117A
相关PDF资料 |
PDF描述 |
|---|---|
| TC7116IJL | 1-CH 13-BIT DUAL-SLOPE ADC, ACCESS, CDIP40 |
| TC7116ACLWRT | 1-CH DUAL-SLOPE ADC, ACCESS, PQCC44 |
| TC7116CLWRT | 1-CH DUAL-SLOPE ADC, ACCESS, PQCC44 |
| TC7116CLWTR | 1-CH 13-BIT DUAL-SLOPE ADC, PQCC44 |
| TC7116CLW | 1-CH 13-BIT DUAL-SLOPE ADC, ACCESS, PQCC44 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC7116CKW | 功能描述:LCD 驱动器 w/Hold RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7116CKW713 | 功能描述:LCD 驱动器 w/Hold RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7116CLW | 功能描述:LCD 驱动器 w/Hold RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7116CLW713 | 功能描述:LCD 驱动器 w/Hold RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7116CPL | 功能描述:LCD 驱动器 w/Hold RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。