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ICL8068A Datasheet(PDF) 10 Page - Intersil Corporation

Part # ICL8068A
Description  Precision 4 1/2 Digit, A/D Converter
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ICL8068A Datasheet(HTML) 10 Page - Intersil Corporation

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10
Component Value Selection
For optimum performance of the analog section, care must
be taken in the selection of values for the integrator capacitor
and resistor, auto-zero capacitor, reference voltage, and
conversion rate. These values must be chosen to suit the
particular application.
Integrating Resistor
The integrating resistor is determined by the full scale input
voltage and the output current of the buffer used to charge
the integrator capacitor. This current should be small
compared to the output short circuit current such that
thermal effects are kept to a minimum and linearity is not
affected. Values of 5
µAto 40µA give good results with a
nominal of 20
µA. The exact value may be chosen by:
NOTE: If gainisusedinthe buffer amplifier, then:
Integrating Capacitor
The product of integrating resistor and capacitor is selected
to give 9V swing for full scale inputs. This is a compromise
between possibly saturating the integrator (at +14V) due to
tolerance buildup between the resistor, capacitor and clock
and the errors a lower voltage swing could induce due to
offsets referred to the output of the comparator. In general,
the value of CINT is given by:
A very important characteristic of the integrating capacitor is
that it has low dielectric absorption to prevent roll-over or
ratiometric errors. A good test for dielectric absorption is to
use the capacitor with the input tied to the reference.
This ratiometric condition should be read half scale 1.0000,
and any deviation is probably due to dielectric absorption.
Polypropylene capacitors give undetectable errors at
reasonable cost. Polystyrene and polycarbonate capacitors
may be used in less critical applications.
Auto-Zero and Reference Capacitor
The size of the auto-zero capacitor has some influence on
the noise of the system, with a larger value capacitor giving
less noise. The reference capacitor should be large enough
such that stray capacitance to ground from its nodes is
negligible.
When gain is used in the buffer amplifier the reference
capacitor should be substantially larger than the auto-zero
capacitor. As a rule of thumb, the reference capacitor should
be approximately the gain times the value of the auto-zero
capacitor. The dielectric absorption of the reference cap and
auto-zero cap are only important at power-on or when the
circuit is recovering from an overload. Thus, smaller or
cheaper caps can be used here if accurate readings are not
required for the first few seconds of recovery.
FIGURE 5. TIMING DIAGRAM FOR OUTPUTS
AUTO
COUNTS
10,001
INTEGRATOR
BUSY
SIGNAL
COUNTS
10,000
INTEG.
REFERENCE
COUNTS MAX
20,001 / 2,001
INTEGRATE
D5
D4
D3
D2
D1
AUTO ZERO
DIGIT SCAN
FOR OVER-RANGE
SIGNAL
INTEGRATE
REFERENCE
INTEGRATE
D1
D2
D3
D4
D5
FIRST D5 OF AZ AND REF INT
ONE COUNT LONGER
STROBE
1000
/100 COUNTS
DIGIT SCAN
FOR OVER-RANGE
EXPANDED SCALE BELOW
/1,000
OVER-RANGE
WHEN APPLICABLE
UNDER-RANGE
WHEN APPLICABLE
OUTPUT
/1,001
ZERO
FULL MEASUREMENT CYCLE
40,002/4,002 COUNTS
R
INT
Full Scale Voltage (See Note)
20
µA
-------------------------------------------------------------------------------
=
R
IN T
Bu fferGa in
() (Full Scale Voltage)
20
µA
--------------------------------------------------------------------------------------------
=
C
INT
10,000(4-1/2 Digit)
1000(3-1/2 Digit)
Clock Period
×
20
µA
()
×
Integrator Output Voltage Swing
-------------------------------------------------------------------------------------------------------------------------
=
ICL8052A/ICL71C03, ICL8068A/ICL71C03


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