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ICL7136CM44Z Datasheet(PDF) 11 Page - Intersil Corporation

Part # ICL7136CM44Z
Description  31/2 Digit LCD, Low Power Display, A/D Converter with Overrange Recovery
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ICL7136CM44Z Datasheet(HTML) 11 Page - Intersil Corporation

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FN3086.6
July 21, 2005
Reference Voltage
The analog input required to generate full scale output (2000
counts) is: VlN = 2VREF. Thus, for the 200mV and 2V scale,
VREF should equal 100mV and 1V, respectively. However, in
many applications where the A/D is connected to a
transducer, there will exist a scale factor other than unity
between the input voltage and the digital reading. For
instance, in a weighing system, the designer might like to
have a full scale reading when the voltage from the
transducer is 0.662V. Instead of dividing the input down to
200mV, the designer should use the input voltage directly
and select VREF = 0.341V. Suitable values for integrating
resistor and capacitor would be 330k
Ω and 0.047µF. This
makes the system slightly quieter and also avoids a divider
network on the input. Another advantage of this system
occurs when a digital reading of zero is desired for VIN ≠ 0.
Temperature and weighing systems with a variable fare are
examples. This offset reading can be conveniently
generated by connecting the voltage transducer between
IN HI and COMMON and the variable (or fixed) offset
voltage between COMMON and IN LO.
Typical Applications
The ICL7136 may be used in a wide variety of
configurations. The circuits which follow show some of the
possibilities, and serve to illustrate the exceptional versatility
of these A/D converters.
The following application notes contain very useful
information on understanding and applying this part and are
available from Intersil.
Application Notes
NOTE #
DESCRIPTION
AN016
“Selecting A/D Converters”
AN017
“The Integrating A/D Converter”
AN018
“Do’s and Don’ts of Applying A/D Converters”
AN023
“Low Cost Digital Panel Meter Designs”
AN032
“Understanding the Auto-Zero and Common Mode
Performance of the ICL7136/7/9 Family”
AN046
“Building a Battery-Operated Auto Ranging DVM with
the ICL7106”
AN052
“Tips for Using Single Chip 31/2 Digit A/D Converters”
FIGURE 8. ICL7136 USING THE INTERNAL REFERENCE
FIGURE 9. RECOMMENDED COMPONENT VALUES FOR 2V
FULL SCALE
28
40
39
38
37
36
35
34
33
32
31
30
29
27
26
25
24
23
22
21
OSC 1
OSC 2
OSC 3
TEST
REF HI
REF LO
CREF
CREF
COMMON
IN HI
IN LO
A-Z
BUFF
INT
V
-
G2
C3
A3
G3
BP
50pF
TO PIN 1
SET VREF
= 100mV
0.1
µF
0.01
µF
1M
180k
20k
240k
IN
+
-
9V
180k
0.047
µF
0.47
µF
TO BACKPLANE
TO DISPLAY
Values shown are for 200mV full scale, 3 readings/sec., floating
supply voltage (9V battery).
+
-
28
40
39
38
37
36
35
34
33
32
31
30
29
27
26
25
24
23
22
21
OSC 1
OSC 2
OSC 3
TEST
REF HI
REF LO
CREF
CREF
COMMON
IN HI
IN LO
A-Z
BUFF
INT
V
-
G2
C3
A3
G3
BP/GND
50pF
TO PIN 1
SET VREF
= 100mV
0.1
µF
0.01
µF
1M
180k
250k
Ω 240kΩ
IN
+
-
1.8M
0.047
µF
0.01
µF
TO DISPLAY
V+
V-
ICL7136


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