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參數(shù)資料
| 型號(hào)： | TC7136ACPL |
| 元件分類： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁(yè)數(shù)： | 2/15頁(yè) |
| 文件大?。?/td> | 134K |
| 代理商： | TC7136ACPL |
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10
TC7136
TC7136A
Low Power 3-1/2 Digit Analog-To-
Digital Converters
TC7136-6
10/18/96
2001 Microchip Technology Inc.
DS21461A
Figure 7. Common-Mode Voltage Removed in Battery Operation With VIN = Analog Common
In systems where common-mode voltages exist, the
86 dB common-mode rejection ratio minimizes error. Com-
mon-mode voltages do, however, affect the integrator out-
put level. A worst-case condition exists if a large positive
VCM exists in conjunction with a full-scale negative differ-
ential signal. The negative signal drives the integrator
output positive along with VCM (see Figure 8.) For such
applications, the integrator output swing can be reduced
below the recommended 2V full-scale swing. The integra-
tor output will swing within 0.3V of V+ or V– without in-
creased linearity error.
Differential Reference
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 roll-over type errors being induced by large
common-mode voltages, CREF should be large compared to
stray node capacitance.
The TC7136/A offers a significantly improved analog
common temperature coefficient. This potential provides a
very stable voltage, suitable for use as a voltage reference.
The temperature coefficient of analog common is typically
35 ppm/
°C.
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 internally to an
N-channel FET capable of sinking 100
A. 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
A. Analog common is therefore easily
pulled to a more negative voltage (i.e., below V+ – 3V).
The TC7136/A connects the internal VIN+ 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 bat-
tery operation, analog common and V
–
IN are usually con-
nected, removing common-mode voltage concerns. In sys-
tems where V
–
IN is connected 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 section
reference, or common point. The TC7136A is specifically
designed to operate from a battery or in any measurement
system where input signals are not referenced (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 potential with excellent
Figure 8. Common-Mode Voltage Reduces Available Integrator
Swing (VCOM
≠ V
IN)
VBUF
CAZ VINT
BP
POL
SEGMENT
DRIVE
OSC1
OSC3
OSC2
V
–
V
+
VREF
+
VREF
–
ANALOG
COMMON
V
–
V
+
V
–
V
+
GND
MEASURED
SYSTEM
POWER
SOURCE
9V
LCD
TC7136
TC7136A
+
V
–
V
+
RI
+
–
VIN
V
C I
INTEGRATOR
VI =
[
VCM
VIN
–
INPUT
BUFFER
CI =
=
RI
Integration capacitor
Integration resistor
4000
f
Integration time
T I ==
Where:
VI
CM
OSC
–
+
–
+
TI
RI CI
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC7136ARCPL | 功能描述:LCD 驅(qū)動(dòng)器 Low Power RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC7136CKW | 功能描述:LCD 驅(qū)動(dòng)器 Low Power RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC7136CKW713 | 功能描述:LCD 驅(qū)動(dòng)器 Low Power RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC7136CLW | 功能描述:LCD 驅(qū)動(dòng)器 Low Power RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC7136CLW713 | 功能描述:LCD 驅(qū)動(dòng)器 Low Power RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
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