參數(shù)資料
型號： TC7107ACPLIJL
元件分類： ADC
英文描述： 1-CH DUAL-SLOPE ADC, ACCESS, PDIP40
封裝： CERDIP-40
文件頁數(shù)： 18/21頁
文件大?。?/td> 269K
代理商： TC7107ACPLIJL
6
TC7106
TC7106A
TC7107
TC7107A
3-1/2 DIGIT A/D CONVERTERS
General Theory of Operation
Dual Slope Conversion Principles
(All Pin Designations Refer to the 40-Pin DIP)
The TC7106A and TC7107A are dual slope, integrating
analog-to-digital converters. An understanding of the dual
slope conversion technique will aid in following the detailed
operation theory.
The conventional dual slope converter measurement
cycle has two distinct phases:
Input Signal Integration
Reference Voltage Integration (Deintegration)
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 2A).
In a simple dual slope converter a complete conversion
requires the integrator output to “ramp-up” and “ramp-
down.”
A simple mathematical equation relates the input signal,
reference voltage and integration time:
VIN(t)dt =
Figure 2A. Basic Dual Slope Converter
1
RC
∫TSI
VRTRI
RC
0
where:
VR = Reference Voltage
TSI = Signal Integration Time (Fixed)
TRI = Reference Voltage Integration Time (Variable)
For a constant VIN:
VIN = VR
TRI
TSI
+
–
REF
VOLTAGE
ANALOG
INPUT
SIGNAL
+
–
DISPLAY
SWITCH
DRIVER
CONTROL
LOGIC
INTEGRATOR
OUTPUT
CLOCK
COUNTER
POLARITY CONTROL
PHASE
CONTROL
VIN
VFULL SCALE
1/2 VFULL SCALE
VARIABLE
REFERENCE
INTEGRATE
TIME
FIXED
SIGNAL
INTEGRATE
TIME
INTEGRATOR
C
COMPARATOR
≈
+/–
PIN DESCRIPTION (Cont.)
(Pin No.
40-Pin PDIP
(Normal)
(Reverse)
Symbol
Description
34
(7)
C
+
REF
A 0.1
F capacitor is used in most applications. If a large common-
mode voltage exists (for example, the V
–
IN pin is not at analog
common), and a 200mV scale is used, a 1
F capacitor is recom-
mended and will hold the roll-over error to 0.5 count.
35
(6)
V –
REF
See pin 36.
36
(5)
V+REF
The analog input required to generate a full-scale output (1999
counts). Place 100mV between pins 35 and 36 for 199.9mV
full-scale. Place 1V between pins 35 and 36 for 2V full scale. See
paragraph on REFERENCE VOLTAGE.
37
(4)
Test
Lamp test. When pulled HIGH (to V
+) all segments will be turned on
and the display should read –1888. It may also be used as a negative
supply for externally-generated decimal points. See paragraph under
TEST for additional information.
38
(3)
OSC3
See pin 40.
39
(2)
OSC2
See pin 40.
40
(1)
OSC1
Pins 40, 39, 38 make up the oscillator section. For a 48kHz clock
(3 readings per section), connect pin 40 to the junction of a 100k
resistor and a 100pF capacitor. The 100k
resistor is tied to pin 39
and the 100pF capacitor is tied to pin 38.
相關(guān)PDF資料
PDF描述
TC7107ACPLIJL 1-CH DUAL-SLOPE ADC, PDIP40
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TC7107RCPLIJL 1-CH DUAL-SLOPE ADC, PDIP40
TC7107AILW713 1-CH DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC44
TC7107IKW713 1-CH DUAL-SLOPE ADC, PARALLEL ACCESS, PQFP44
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