ICL7650CPA Ver la hoja de datos (PDF) - Linear Technology
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ICL7650CPA Datasheet PDF : 24 Pages
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TYPICAL APPLICATIO S
LTC1052/LTC7652
Direct Thermocouple-to-Frequency Converter
RT
–
+
TYPE K
THERMOCOUPLE 41.4µV/°C
STABILIZING AMP
5V
3+ 7
1.8k*
100k
1N914
LTC1052 6
33k
2–
8
4
1µF
1
OPTIONAL INPUT
FILTER-AND-OVERLOAD
CLAMP
0.1µF
0.1µF
– 5V
150k**
3300pF
50k
60°C TRIM
33k**
A†
1µF
16
LTC1043
5
6
2
100pF
COLD JUNCTION BIAS
487Ω*
301k*
0.1µF
COLD JUNCTION TEMPERATURE TRACKING
1N4148
470Ω
A
10k
B
C
D
E
74C04
0.68µF
820pF
5V
74C04
F
– 5V
4.75k*
5V
3k
5V
74C903
OUTPUT
0Hz TO 600Hz
0°C TO 60°C
1k*
LT1004–1.2V
*0.01% FILM-TRW MAR-6
**TRW/MTR/5/ + 120
RT = YELLOW SPRINGS INST. #44007
100pF = POLYSTYRENE
†FOR GENERAL PURPOSE (1mV FULL-SCALE)
10-BIT A-TO-D, REMOVE THERMOCOUPLE—
COLD JUNCTION NETWORK, GROUND POINT A,
AND DRIVE LTC1052 POSITIVE INPUT
187Ω*
LTC1052/7652 • TA16
Direct 10-Bit Strain Gauge Digitizer
1000pF
3+ 1
8 6 1k
LM301A
2–
4
7 – 5V
5V
20Ω
2N2905
BRIDGE DRIVE
5V
74C00
5V
20Ω STRAIN GAUGE
28k
TRANSDUCER
ZIN = 350Ω
ZOUT = 350Ω
1000pF
470k*
1N4148
3.3MΩ*
1/2 LTC1043
7
8
SW1
– 5V
14k
CLOCK
0.003µF
INTEGRATOR
5V
2– 7
LTC1052
5V
14 1 4 3
62
5
1/2 74C74
3+
8
4
76
1
– 5V
0.01µF
0.01µF
– 5V
1N4148
– 5V
3.3M
11
16
12
5V
10k
5V
1/2 74C903
FREQUENCY
OUT B
FREQUENCY
OUT A
– 5V
OUTPUT
GATING
DATA OUTPUT =
OUT A = 1000 COUNTS FULL-SCALE
OUT B
*0.1% METAL FILM TRW MAR-5
SW1 = MAIN CURRENT SWITCH
SW2 = CURRENT LOADING COMPENSATION SWITCH
SW2
13
14
CONNECT DIRECTLY
ACROSS BRIDGE
DRIVE POINTS
100k
10k
CONNECT TO BRIDGE
END OF 470k RESISTOR
(OPTIONAL)
TRANSDUCER ZERO NETWORK
22.3k*
+
1k*
33µF
LTC1052/7652 • TA17
1052fa
17
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