參數(shù)資料
型號： TC7135C/LI
元件分類： ADC
英文描述： 1-CH 4-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC28
封裝： PLASTIC, LCC-28
文件頁數(shù)： 26/28頁
文件大?。?/td> 443K
代理商： TC7135C/LI
2007 Microchip Technology Inc.
DS21460D-page 7
TC7135
3.2.1
SYSTEM ZERO
During this phase, errors due to buffer, integrator and
comparator offset voltages are compensated for by
charging CAZ (auto-zero capacitor) with a compensat-
ing error voltage. With a zero input voltage, the
integrator output will remain at zero.
The external input signal is disconnected from the
internal circuitry by opening the two SWI switches. The
internal
input
points
connect
to
the
ANALOG
COMMON pin. The reference capacitor charges to the
reference voltage potential through SWR. A feedback
loop, closed around the integrator and comparator,
charges the CAZ capacitor with a voltage to compen-
sate for buffer amplifier, integrator and comparator
offset voltages (see Figure 3-2).
FIGURE 3-2:
System Zero Phase.
3.2.2
ANALOG INPUT SIGNAL
INTEGRATION
The TC7135 integrates the differential voltage between
the +INPUT and -INPUT pins. The differential voltage
must be within the device Common mode range; -1V
from either supply rail, typically. The input signal
polarity is determined at the end of this phase.
FIGURE 3-3:
Input Signal Integration
Phase.
3.2.3
REFERENCE VOLTAGE
INTEGRATION
The previously charged reference capacitor is con-
nected with the proper polarity to ramp the integrator
output back to zero
(see Figure 3-4). The digital
reading displayed is:
EQUATION 3-3:
FIGURE 3-4:
Reference Voltage
Integration Cycle.
3.2.4
INTEGRATOR OUTPUT ZERO
This phase ensures the integrator output is at 0V when
the system zero phase is entered. It also ensures that
the true system offset voltages are compensated for.
This phase normally lasts 100 to 200 clock cycles. If an
overrange condition exists, the phase is extended to
6200 clock cycles (see Figure 3-5).
FIGURE 3-5:
Integrator Output Zero
Phase.
+
–
+
–
+IN
REF
IN
Analog
Common
IN
SWR
SWIZ SWZ
SWZ
Integrator
Switch Closed
Switch Open
SW
RI
+
Comparator
To
Section
Analog
Input Buffer
RINT
CINT
CREF
CSZ
SW
RI
-
SWI
SWZ
SW
RI
+
SW
RI
-
SWI
SW1
+
–
Digital
+
–
+
–
+IN
REF
IN
Analog
Common
IN
SWR
SWIZ SWZ
SWZ
Integrator
Switch Closed
Switch Open
SW
RI
+
Comparator
To
Section
Analog
Input Buffer
RINT
CINT
CREF
CSZ
SW
RI
-
SWI
SWZ
SW
RI
+
SW
RI
-
SWI
SW1
+
–
Digital
Reading
10 000
Differential Input
[]
V
REF
-----------------------------------------------
,
=
+
–
+
–
+IN
REF
IN
Analog
Common
IN
SWR
SWIZ SWZ
SWZ
Integrator
Switch Closed
Switch Open
SW
RI
+
Comparator
To
Section
Analog
Input Buffer
RINT
CINT
CREF
CSZ
SW
RI
-
SWI
SWZ
SW
RI
+
SW
RI
-
SWI
SW1
+
–
Digital
+
–
+
–
+IN
REF
IN
Analog
Common
IN
SWR
SWIZ SWZ
SWZ
Integrator
Switch Closed
Switch Open
SW
RI
+
Comparator
To
Section
Analog
Input Buffer
RINT
CINT
CREF
CSZ
SW
RI
-
SWI
SWZ
SW
RI
+
SW
RI
-
SWI
SW1
+
–
Digital
相關PDF資料
PDF描述
TC7135C/LI713 1-CH 4-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC28
TC7135C/KW 1-CH 4-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PQFP44
TC7135C/BU 1-CH 4-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PQFP64
TC7135CJI DUAL-SLOPE ADC, PARALLEL ACCESS, CDIP28
TC7135CLI DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC28
相關代理商/技術參數(shù)
參數(shù)描述
TC7135CLI713 功能描述:LED顯示驅(qū)動器 4-1/2 Digit A/D BCD RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube
TC7135CPI 功能描述:LED顯示驅(qū)動器 4-1/2 Digit A/D BCD RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube
TC7135CPL 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:4-1/2 Digit A/D Converter
TC7136 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low Power 3-1/2 Digit Analog-to-Digital Converter
TC7136A 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:LOW POWER, 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*