LTC1531CSW 查看數據表（PDF） - Linear Technology
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LTC1531CSW Datasheet PDF : 16 Pages
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TYPICAL APPLICATIONS
LTC1531
R2
10M
C2, 1µF
VCC
VOUT
0V TO VCC
FULL-SCALE
OUTPUT
RESOLUTION = 4mV
SETTLING TIME = 10sec
LT1490
R3
10M
VCC
10k
10k
VCC
VCC
ZCDATA
DATA
VALID
GND
SHDN
QD
ISOLATION
BARRIER
ZCPOS ZCNEG
VPW
2.5V VREG
V1
V2
+
V3
–
V4
+
2.2µF
1
0V TO 2.5V
FULL-SCALE
INPUT
CMPOUT R1, 1M
LTC1531
1 = ISOLATED GROUND
= EQUIPMENT GROUND
ISOGND
C1
0.22µF
1
1
DELTA-SIGMA TYPE MODULATION:
1531 F09
CMPOUT IS ON 108µs AT ~300Hz RATE
THEREFORE: 108µs • 300Hz = 1/30TH
TIME CONSTANT = 1M • 30 • 0.22µF = 6.6sec
Figure 9. Isolated Voltage Sense
R2
10M
C2, 1µF
VCC
VOUT
0V TO VCC
FULL-SCALE
OUTPUT
RESOLUTION = 4mV
SETTLING TIME = 10sec
LT1490
R3
10M
VCC
10k
10k
VCC
VCC
ZCDATA
DATA
VALID
GND
ISOLATION
BARRIER
+
2.2µF
SHDN
ZCPOS ZCNEG
QD
VPW
2.5V VREG
V1
V2
+
V3
–
V4
1
100k
1
CMPOUT R1, 1M
LTC1531
1 = ISOLATED GROUND
= EQUIPMENT GROUND
ISOGND
C1
0.22µF
1
1
DELTA-SIGMA TYPE MODULATION:
1531 TA05
CMPOUT IS ON 108µs AT ~300Hz RATE
THEREFORE: 108µs • 300Hz = 1/30TH
TIME CONSTANT = 1M • 30 • 0.22µF = 6.6sec
Figure 10. Isolated Potentiometer Transducer Sense
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