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TC826 데이터시트(PDF) 6 Page - Microchip Technology

부품명 TC826
상세설명  Analog-to-Digital Converter with Bar Graph Display Output
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제조업체  MICROCHIP [Microchip Technology]
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TC826 데이터시트(HTML) 6 Page - Microchip Technology

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TC826
DS21477B-page 6
© 2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
3.1
Dual Slope Conversion Principles
The TC826 is a dual slope, integrating analog-to-digital
converter. The conventional dual slope converter mea-
surement cycle has two distinct phases:
• Input Signal Integration
• Reference Voltage Integration (De-integration)
The input signal being converted is integrated for a
fixed time period (TSI). Time is 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)
(Figure 3-1).
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:
FIGURE 3-1:
BASIC DUAL SLOPE CONVERTER
1
RC
tINT
0
VIN(t)dt =
VRTRI
RC
Where:
VR = Reference Voltage
VSI = Signal Integration Time (Fixed)
TRI = Reference Voltage Integration Time
(Variable)
+
Integrator
REF
Voltage
Switch Driver
+
Phase Control
Polarity Control
Control
Logic
Comparator
C
R
Clock
Counter
Display
Analog Input
Signal
+/–
Fixed Signal
Integrate
Time
Variable
Reference
Integrate
Time
VIN ≈ 1/2 VFULL SCALE
VIN ≈ 1/4 VFULL SCALE


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