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参数资料
| 型号： | TC7129CKW |
| 元件分类： | ADC |
| 英文描述： | 1-CH 4-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PQFP44 |
| 封装： | 10 X 10 MM, PLASTIC, MO-122-AA-1, QFP-44 |
| 文件页数： | 2/28页 |
| 文件大小： | 544K |
| 代理商： | TC7129CKW |
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TC7129
DS21459D-page 10
2006 Microchip Technology Inc.
4.2.3
+5V Power Supply
Measurements are made with respect to power supply
ground. COMMON (pin 28) is connected to REF LO
(pin 35). A voltage doubler is needed, since the supply
voltage is less than the 6V minimum needed by the
TC7129. DGND (pin 36) must be isolated from power
supply ground (see Figure 4-3).
Figure 4-3:
Powering the TC7129 From
a +5V Power Supply.
4.3
Connecting to External Logic
External logic can be directly referenced to DGND
(pin 36), provided that the supply current of the external
logic does not exceed the sink current of DGND
(Figure 4-4). A safe value for DGND sink current is
1.2 mA. If the sink current is expected to exceed this
value, a buffer is recommended (see Figure 4-5).
Figure 4-4:
External Logic Referenced
Directly to DGND.
Figure 4-5:
External Logic Referenced
to DGND with Buffer.
4.4
Temperature Compensation
For most applications, VDISP (pin 19) can be connected
directly to DGND (pin 36). For applications with a wide
temperature range, some LCDs require that the drive
levels vary with temperature to maintain good viewing
angle and display contrast. Figure 4-6 shows two
circuits that can be adjusted to give temperature com-
pensation of about 10 mV/°C between V+ (pin 24) and
VDISP. The diode between DGND and VDISP should
have a low turn-on voltage because VDISP cannot
exceed 0.3V below DGND.
V–
V+
DGND
+
10 F
+
8
2
4
10 F
+
–
3
VIN
5
24
34
35
28
33
32
23
36
TC7660
V+
GND
0.1 F
+5V
TC7129
External
Logic
DGND
V
+
36
24
23
ILOGIC
TC7129
V-
–
+
External
Logic
ILOGIC
DGND
23
24
V+
36
TC7129
V–
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC7129CKW713 | 功能描述:LCD 驱动器 w/LCD Driver 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 |
| TC7129CLW | 功能描述:LCD 驱动器 w/LCD Driver 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 |
| TC7129CLW713 | 功能描述:LCD 驱动器 w/LCD Driver 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 |
| TC7129CPL | 功能描述:LCD 驱动器 w/LCD Driver 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 |
| TC7129CPL713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers |
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