參數(shù)資料
型號(hào)： TC7136CKW
元件分類： ADC
英文描述： 1-CH DUAL-SLOPE ADC, PQFP44
封裝： PLASTIC, QFP-44
文件頁(yè)數(shù)： 22/22頁(yè)
文件大小： 410K
代理商： TC7136CKW
2005 Microchip Technology Inc.
DS21461C-page 9
TC7136/TC7136A
3.0
DETAILED DESCRIPTION
(All Pin Designations Refer to 40-Pin PDIP.)
3.1
Dual Slope Conversion Principles
The TC7136/A is a dual slope, integrating analog-to-
digital converter. An understanding of the dual slope
conversion technique will aid in following detailed
TC7136/A operational theory.
The conventional dual slope converter measurement
cycle has two distinct phases (see Figure 3-1).
1.
Input signal integration
2.
Reference voltage integration (de-integration)
The input signal being converted is integrated for a
fixed time period (tSI), measured by counting clock
pulses. An opposite polarity constant reference voltage
is then integrated until the integrator output voltage
returns to zero. The reference integration time is
directly proportional to the input signal (tRI).
In a simple dual slope converter, a complete conver-
sion requires the integrator output to "ramp up" and
"ramp down."
A simple mathematical equation relates the input
signal, reference voltage, and integration time:
EQUATION 3-1:
For a constant VIN:
EQUATION 3-2:
FIGURE 3-1:
BASIC DUAL SLOPE
CONVERTER
FIGURE 3-2:
NORMAL MODE
REJECTION OF DUAL
SLOPE CONVERTER
The dual slope converter accuracy is unrelated to the
integrating resistor and capacitor values, as long as
they are stable during a measurement cycle. Noise
immunity is an inherent benefit. Noise spikes are inte-
grated or averaged to zero during integration periods.
Integrating ADCs are immune to the large conversion
errors that plague successive approximation convert-
ers in high noise environments. Interfering signals with
frequency components at multiples of the averaging
period will be attenuated. Integrating ADCs commonly
operate with the signal integration period set to a
multiple of the 50Hz/60Hz power line period.
1
RC
---------
V
IN
t
() t
d
0
t
SI
∫
V
R
t
RI
RC
------------
=
Where:
VR = Reference voltage
tSI = Signal integration time (fixed)
tRI = Reference voltage integration time
(variable)
V
IN
V
R
t
RI
t
SI
--------
=
+
–
REF
Voltage
Analog Input
Signal
+
–
Display
Switch
Driver
Control
Logic
Integrator
Output
Clock
Counter
Polarity Control
Phase
Control
VIN ≈ VREF
VIN ≈ 1/2 VREF
Variable
Reference
Integrate
Time
Fixed
Signal
Integrate
Time
Integrator
Comparator
CINT
30
20
10
0
Normal
Mode
Rejection
(dB)
0.1/t
1/t
10/t
Input Frequency
t = Measured Period
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
TC7136CPI 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
TC7136CPL 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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