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参数资料
| 型号： | TC7136CKW713 |
| 厂商： | Microchip Technology |
| 文件页数： | 14/22页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 1/2DGT LOW PWR 44-MQFP |
| 标准包装： | 900 |
| 显示器类型： | LCD |
| 配置： | 7 段显示 |
| 数字或字符： | A/D，3.5 位数字 |
| 电流 - 电源： | 70µA |
| 电源电压： | 9V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 带卷 (TR) |
TC7136/TC7136A
The TC7136/A connects the internal V IN + and V IN -
inputs to analog common during the auto-zero phase.
During the reference integrate phase, V IN - is connected
to analog common. If V IN - is not externally connected to
analog common, a Common mode voltage exists, but
is rejected by the converter's 86dB Common mode
rejection ratio. In battery operation, analog common
FIGURE 7-3:
200
180
ANALOG COMMON
TEMPERATURE
COEFFICIENT
and V IN - are usually connected, removing Common
mode voltage concerns. In systems where V IN - is con-
nected to the power supply ground or to a given
voltage, analog common should be connected to V IN -.
The analog common pin serves to set the analog sec-
160
140
120
100
Maximum
No Maximum
Specified
Typical
tion reference, or common point. The TC7136A is spe-
cifically designed to operate from a battery, or in any
measurement system where input signals are not refer-
enced (float), with respect to the TC7136A power
source. The analog common potential of V+ – 3V gives
a 7V end of battery life voltage. The common potential
80
60
40
20
Maximum
Typical
Typical
has a 0.001%/% voltage coefficient.
0
TC7136A
TC7136
ICL7136
With sufficiently high total supply voltage
(V+ – V- > 7V), analog common is a very stable poten-
tial with excellent temperature stability (typically
35ppm/°C for TC7136A. This potential can be used to
generate the TC7136A's reference voltage. An external
voltage reference will be unnecessary in most cases,
because of the 35ppm/°C temperature coefficient. See
discussion.
FIGURE 7-4:
26
9V
TC7136A INTERNAL
VOLTAGE REFERENCE
CONNECTION
+
1
7.4
TEST (Pin 37)
V-
TC7136
V+
240k Ω
The TEST pin potential is 5V less than V + . TEST may
TC7136A
be used as the negative power supply connection for
V REF +
36
10k Ω
V REF -
external CMOS logic. The TEST pin is tied to the inter-
nally generated negative logic supply through a 500 Ω
resistor. The TEST pin load should not be more than
1mA. See Section 8.0, Typical Applications for addi-
tional information on using TEST as a negative digital
logic supply.
If TEST is pulled high (to V+), all segments plus the
minus sign will be activated. DO NOT OPERATE IN
THIS MODE FOR MORE THAN SEVERAL MINUTES.
With TEST = V+, the LCD segments are impressed with
a DC voltage which will destroy the LCD.
V REF
35
ANALOG 32
COMMON
Set V REF = 1/2 V REF
7.5
TC7136A Internal Voltage
Reference
The TC7136 analog common voltage temperature sta-
bility has been significantly improved (Figure 7-3). The
"A" version of the industry standard TC7136 device
allows users to upgrade old systems and design new
systems without external voltage references. External
R and C values do not need to be changed; however,
noise performance will be improved by increasing C AZ
shows analog common supplying the necessary
voltage reference for the TC7136/A.
DS21461C-page 14
? 2005 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC7136CLW | 功能描述:LCD 驱动器 Low Power 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 |
| TC7136CLW713 | 功能描述:LCD 驱动器 Low Power 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 |
| TC7136CPI | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low Power 3-1/2 Digit Analog-to-Digital Converter |
| TC7136CPL | 功能描述:LCD 驱动器 Low Power 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 |
| TC7136RCPL | 功能描述:LCD 驱动器 Low Power 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 |
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