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| 型号： | TC7136CKW713 |
| 厂商： | Microchip Technology |
| 文件页数： | 13/22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
7.0
7.1
DEVICE PIN FUNCTIONAL
DESCRIPTION
Differential Signal Inputs
V IN + (Pin 31), V IN - (Pin 30)
V+ – 1V to V- + 1V. Common mode voltages are
removed from the system when the TC7136A operates
from a battery or floating power source (isolated from
measured system), Common mode voltage removed
in battery operation with V IN = analog common and V IN -
is connected to analog common (V COM ) (see
The TC7136/A is designed with true differential inputs
and accepts input signals within the input stage Com-
mon mode voltage range (V CM ). The typical range is
Figure 7-1).
FIGURE 7-1:
COMMON MODE VOLTAGE REMOVED IN BATTERY OPERATION WITH
V IN = ANALOG COMMON
Segment
Drive
LCD
Measured
System
V+
V BUF
V+
V-
C AZ V INT
TC7136
TC7136A
POL BP
OSC1
OSC3
V-
GND
ANALOG
COMMON V REF - V REF + V+
OSC2
V-
V+ V-
Power
GND
+
Source
9V
In systems where Common mode voltages exist, the
7.2
Differential Reference
86dB Common mode rejection ratio minimizes error.
Common mode voltages do, however, affect the inte-
grator output level. A worst case condition exists if a
large positive V CM exists in conjunction with a full scale
negative differential signal. The negative signal drives
the integrator output positive along with V CM (see
Figure 7-2.) For such applications, the integrator out-
put swing can be reduced below the recommended 2V
full scale swing. The integrator output will swing within
0.3V of V+ or V- without increased linearity error.
V REF + (Pin 36), V REF - (Pin 35)
The reference voltage can be generated anywhere
within the V+ to V- power supply range.
To prevent rollover type errors being induced by large
Common mode voltages, C REF should be large com-
pared to stray node capacitance. The TC7136/A offers
a significantly improved analog common temperature
coefficient. This potential provides a very stable volt-
age, suitable for use as a voltage reference. The
temperature coefficient of analog common is typically
FIGURE 7-2:
COMMON MODE
VOLTAGE REDUCES
AVAILABLE INTEGRATOR
SWING (V COM ≠ V IN )
35ppm/°C.
7.3 Analog Common (Pin 32)
The analog common pin is set at a voltage potential
Input Buffer
C I
approximately 3V below V+. The potential is between
2.7V and 3.35V below V+. Analog common is tied inter-
+
+
R I
–
nally to an N-channel FET, capable of sinking 100 μ A.
This FET will hold the common line at 3V below V+ if an
V IN
–
+
Integrator
V I
external load attempts to pull the common line toward
V+. Analog common source current is limited to 1 μ A.
–
Analog common is, therefore, easily pulled to a more
[
[
C I
V CM
t I
V I = V CM = V IN
Where:
t I = Integration time =
4000
F OSC
negative voltage (i.e., below V+ – 3V).
C I = Integration capacitor
R I = Integration resistor
? 2005 Microchip Technology Inc.
DS21461C-page 13
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