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LCL8052ACPD 데이터시트(PDF) 20 Page - Intersil Corporation

부품명 LCL8052ACPD
상세설명  Precision 4 1/2 Digit, A/D Converter
PDF  23 Pages
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제조업체  INTERSIL [Intersil Corporation]
홈페이지  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

LCL8052ACPD 데이터시트(HTML) 20 Page - Intersil Corporation

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20
ICL71C03 with ICL8052A/8068A Integrating A/D Converter Equations
The ICL71C03 does not have an internal crystal or RC
oscillator. It has a clock input only.
Integration Period
Integration Clock Period
tCLOCK =1/fCLOCK
60/50Hz Rejection Criterion
tINT/t60Hz or tINT/t50Hz = Integer
Optimum Integration Current
IINT =20µA
Full Scale Analog Input Voltage
VINFS (Typ) = 200mV to 2.0V = 2VREF
Integrate Resistor
Integrate Capacitor
Integrator Output Voltage
VINT (Typ) = 9V
Output Count
NOTE: The 41/2 digit mode’s LSD will be output as a zero in the 3
1/
2
digit mode.
Output Type:
4 Nibbles BCD with Polarity and Over-range.
Power Supply:
±15V, +5V
V++ = +15V
V- = -15V
V+ = +5V
VREF ≅ 1.75V
If VREF not used, float output pin.
Auto Zero Capacitor Values
0.01
µF<CAZ <1µF
Reference Capacitor Value
CREF =(Buffer Gain) x CAZ
t
INT
10 000
,
f
CL OCK
--------------------- 4-1/2 Digit
()
=
t
INT
1000
,
f
CL OCK
--------------------- 3-1/2 Digit
()
=
R
INT
BufferG ain
() V
IN FS
×
I
INT
-------------------------------------------------------------
=
C
INT
t
INT
() I
INT
()
V
INT
--------------------------------
=
V
INT
t
INT
() I
IN T
()
C
INT
--------------------------------
=
C ount
10 000
,
V
IN
V
REF
---------------
×
(4-1/2 Digit)
=
C ount
1 000
,
V
IN
V
REF
---------------
×
(3-1/2 Digit)
=
FIGURE 20. INTEGRATOR OUTPUT
AUTO ZERO
(COUNTS)
30,001 - 10,001
3,001 - 1,001
INTEGRATE
(FIXED COUNT)
10,000
1,000
DEINTEGRATE
(COUNTS)
1 - 20,001
1 - 2,001
(41/2 DIGIT)
(31/2 DIGIT)
TOTAL CONVERSION TIME (tCONV)
tCONV = 40,002 * tCLOCK (4
1/
2 DIGIT MODE)
tCONV =4,002 * tCLOCK (3
1/
2 DIGIT MODE)
(IN CONTINUOUS MODE)
ICL8052A/ICL71C03, ICL8068A/ICL71C03



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