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AD590 Arkusz danych(PDF) 7 Page - Intersil Corporation

Numer części AD590
Szczegółowy opis  2-Wire, Current Output Temperature Transducer
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Producent  INTERSIL [Intersil Corporation]
Strona internetowa  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

AD590 Arkusz danych(HTML) 7 Page - Intersil Corporation

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12-9
ALL values are in k
Ω.
The ICL7106 has a VIN span of ±2.0V and a VCM range of
(V+ -0.5V) to (V- +1V). R is scaled to bring each range within
VCM while not exceeding VIN. VREF for both scales is
500mV maximum rending on the celsius range 199.9oC
limited by the (short-term) maximum allowable sensor tem-
perature. Maximum reading on the fahrenheit range is
199.9oF (93.3oC) limited by the number of display digits.
See Figure 11 and notes below.
The
Kelvin
scale
version
reads
from
0
to
1999oK
theoretically, and from 223oK to 473oK actually. The 2.26k
resistor brings the input within the ICL7106 VCM range: 2
general-purpose silicon diodes or an LED may be substi-
tuted. See Figure 12 and notes below.
This circuit allows “zero adjustment” as well as slope
adjustment. the ICL8069 brings the input within the com-
mon-mode range, while the 5k
Ω pots trim any offset at
218oK (-55oC), and set the scale factor. See Figure 13 and
notes below.
Notes for Figure 11, Figure 12 and Figure 13
Since all 3 scales have narrow VlN spans, some optimization
of ICL7106 components can be made to lower noise and
preserve CMR. The table below shows the suggested val-
ues. Similar scaling can be used with the ICL7126 and
ICL7136.
RR1
R2
R3
R4
R5
oF
9.00
4.02
2.0
12.4
10.0
0
oC
5.00
4.02
2.0
5.11
5.0
11.8
V+
REF HI
REF LO
ICL7106
IN HI
COMMON
IN LO
R1
R
+
-
V
-
R2
R3
R4
R5
AD590
FIGURE 11. BASIC DIGITAL THERMOMETER, CELSIUS AND
FAHRENHEIT SCALES
R
n
n1
=
5
28k
=
nominal
V+
7.5k
2.26k
+
-
V
-
5k
15k
1.00k
AD590
SCALE
ADJ
REF HI
REF LO
ICL7106
IN HI
COMMON
IN LO
FIGURE 12. BASIC DIGITAL THERMOMETER, KELVIN SCALE
SCALE
VlN RANGE (V)
RlNT (kΩ)CAZ (µF)
K
0.223 to 0.473
220
0.47
C
-0.25 to +1.0
220
0.1
F
-0.29 to +0.996
220
0.1
For all:
CREF = 0.1µF
ClNT = 0.22µF
COSC =100pF
ROSC = 100kΩ
V+
7.5k
1k
+
-
V
-
5k
15k
AD590
SCALE
ADJ
0.1%
1.000V
12k
ZERO
ADJ
26.1k
5k
402
ICL8069
1.235V
REF HI
REF LO
ICL7106
IN HI
COMMON
IN LO
FIGURE 13. BASIC DIGITAL THERMOMETER, KELVIN SCALE
WITH ZERO ADJUST
AD590


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