WS7107CPL データシートの表示（PDF） - Wing Shing International Group
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WS7107CPL Datasheet PDF : 14 Pages
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Typical Applications (Continued)
OSC 1 40
OSC 2 39
TO PIN 1
100kΩ
OSC 3 38
TEST 37
100pF
SET VREF
= 100mV
REF HI 36
REF LO 35
CREF 34
CREF 33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
0.1µF
V+
1kΩ 10kΩ 10kΩ
1.2V (ICL8069)
1MΩ
+
0.47µF
0.01µF
IN
-
47kΩ
INT 27
V - 26
0.22µF
V-
G2 25
C3 24
A3 23
TO DISPLAY
G3 22
GND 21
WS7106 / WS7107
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35
CREF 34
CREF 33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V - 26
G2 25
C3 24
A3 23
G3 22
GND 21
TO PIN 1
100kΩ
100pF
SET VREF
= 100mV
0.1µF
1kΩ 100kΩ
0.47µF
47kΩ
1MΩ
0.01µF
+5V
6.8V
+
IN
-
0.22µF
-5V
TO DISPLAY
IN LO is tied to supply COMMON establishing the correct common mode
voltage. If COMMON is not shorted to GND, the input voltage may float
with respect to the power supply and COMMON acts as a pre-regulator
for the reference. If COMMON is shorted to GND, the input is single
ended (referred to supply GND) and the pre-regulator is overridden.
FIGURE 13. WS 7107 WITH AN EXTERNAL BAND-GAP
REFERENCE (1.2V TYPE)
Since low TC zeners have breakdown voltages ~ 6.8V, diode must
be placed across the total supply (10V). As in the case of Figure 14,
IN LO may be tied to either COMMON or GND.
FIGURE 14. WS7107 WITH ZENER DIODE REFERENCE
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35
CREF 34
CREF 33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V - 26
G2 25
C3 24
A3 23
G3 22
BP/GND 21
TO PIN 1
100kΩ
100pF
SET VREF
= 100mV
0.1µF
25kΩ 24kΩ
0.047µF
470kΩ
1MΩ
0.01µF
V+
+
IN
-
0.22µF
V-
TO DISPLAY
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35
CREF 34
CREF 33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V - 26
G2 25
C3 24
A3 23
G3 22
GND 21
TO PIN 1
100kΩ
100pF
SET VREF
= 100mV
0.1µF
+5V
1kΩ 10kΩ 15kΩ
1.2V (ICL8069)
1MΩ
+
0.47µF
0.01µF
IN
-
47kΩ
0.22µF
TO DISPLAY
An external reference must be used in this application, since the
voltage between V+ and V- is insufficient for correct operation of the
internal reference.
FIGURE 15. WS7106 AND WS7107; RECOMMENDED
COMPONENT VALUES FOR 2V FULL SCALE
FIGURE 16. WS7107 OPERATED FROM SINGLE +5V
11
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