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| 型号： | TC7136ACLW |
| 元件分类： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 6/22页 |
| 文件大小： | 410K |
| 代理商： | TC7136ACLW |
TC7136/TC7136A
DS21461C-page 14
2005 Microchip Technology Inc.
The TC7136/A connects the internal VIN+ and VIN-
inputs to analog common during the auto-zero phase.
During the reference integrate phase, VIN- is connected
to analog common. If VIN- 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
and VIN- are usually connected, removing Common
mode voltage concerns. In systems where VIN- is con-
nected to the power supply ground or to a given
voltage, analog common should be connected to VIN-.
The analog common pin serves to set the analog sec-
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
has a 0.001%/% voltage coefficient.
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
Section 7.5, TC7136A Internal Voltage Reference
discussion.
7.4
TEST (Pin 37)
The TEST pin potential is 5V less than V+. TEST may
be used as the negative power supply connection for
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.
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 CAZ
(see Section 6.1, Auto-Zero Capacitor). Figure 7-4
shows analog common supplying the necessary
voltage reference for the TC7136/A.
FIGURE 7-3:
ANALOG COMMON
TEMPERATURE
COEFFICIENT
FIGURE 7-4:
TC7136A INTERNAL
VOLTAGE REFERENCE
CONNECTION
Typical
Maximum
Typical
No Maximum
Specified
200
180
160
140
120
100
80
60
40
20
0
Analog
Common
Temperature
Coefficient
(ppm/
°C)
TC7136
TC7136A
ICL7136
V-
ANALOG
COMMON
TC7136
TC7136A
VREF+
32
35
36
26
240k
Ω
10k
Ω
VREF-
VREF
1
+
9V
Set VREF = 1/2 VREF
V+
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| TC7136ACLW713 | 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 |
| TC7136ACPI | 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 |
| TC7136ACPL | 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 |
| TC7136ARCPL | 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 |
| TC7136CKW | 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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