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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： | 5/22页 |
| 文件大小： | 410K |
| 代理商： | TC7136ACLW |
2005 Microchip Technology Inc.
DS21461C-page 13
TC7136/TC7136A
7.0
DEVICE PIN FUNCTIONAL
DESCRIPTION
7.1
Differential Signal Inputs
VIN+ (Pin 31), VIN- (Pin 30)
The TC7136/A is designed with true differential inputs
and accepts input signals within the input stage Com-
mon mode voltage range (VCM). The typical range is
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 VIN = analog common and VIN-
is
connected
to
analog
common
(VCOM) (see
FIGURE 7-1:
COMMON MODE VOLTAGE REMOVED IN BATTERY OPERATION WITH
VIN = ANALOG COMMON
In systems where Common mode voltages exist, the
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 VCM exists in conjunction with a full scale
negative differential signal. The negative signal drives
the integrator output positive along with VCM (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.
FIGURE 7-2:
COMMON MODE
VOLTAGE REDUCES
AVAILABLE INTEGRATOR
SWING
(VCOM ≠ VIN)
7.2
Differential Reference
VREF+ (Pin 36), VREF- (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, CREF 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
35ppm/°C.
7.3
Analog Common (Pin 32)
The analog common pin is set at a voltage potential
approximately 3V below V+. The potential is between
2.7V and 3.35V below V+. Analog common is tied inter-
nally to an N-channel FET, capable of sinking 100
μA.
This FET will hold the common line at 3V below V+ if an
external load attempts to pull the common line toward
V+. Analog common source current is limited to 1
μA.
Analog common is, therefore, easily pulled to a more
negative voltage (i.e., below V+ – 3V).
VBUF
CAZ
VINT
BP
POL
Segment
Drive
OSC1
OSC3
OSC2
V-
V+
VREF+
VREF-
ANALOG
COMMON
V-
V+
GND
Measured
System
Power
Source
9V
LCD
TC7136
TC7136A
+
V-
V+
V-
RI
+
–
VIN
CI
Integrator
VI =
[
VCM = VIN
Input Buffer
CI = Integration capacitor
RI = Integration resistor
4000
FOSC
tI = Integration time =
Where:
VI
–
+
–
+
tI
CI
VCM
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| 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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