LTC6943 查看數據表（PDF） - Linear Technology
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LTC6943
Linear Technology
LTC6943 Datasheet PDF : 16 Pages
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LTC6943
TYPICAL APPLICATIO S
Voltage Controlled Current Source with Ground Referred Input and Output
5V
INPUT
0V TO 2V
3+
8
1
1/2 LT1013
2–
4
0.68µF
5V
1k
3
7
6
9
1µF
1µF
100Ω
10
12
11
1/2 LTC6943
15
14
IOUT =
VIN
100Ω
0.001µF
OPERATES FROM A SINGLE 5V SUPPLY
6943 • TA11
Lock-In Amplifier (= Extremely Narrow-Band Amplifier)
500Hz
SINE DRIVE
THERMISTOR BRIDGE
IS THE SIGNAL SOURCE
T1
4
1 6.19k
3
RT
6.19k
5V
3+
LT1007
6.19k 2 –
–5V
SYNCHRONOUS
DEMODULATOR
10k*
10k*
6
1/4 LTC6943
11
10
100k
12
14
5V
2–
LT1056
3+
– 5V
100Ω
5V
2–
1M
6
LT1012
3+
4
1µF
– 5V
VOUT = 1000 • DC
BRIDGE SIGNAL
+
0.01µF
47µF
PHASE TRIM
50k
10k
0.002
5V
5V
2+
8
1k
7
LT1011
3–
4
1
–5V
ZERO CROSSING DETECTOR
T1 = TF5SX17ZZ, TOROTEL
RT = YSI THERMISTOR 44006
≈ 6.19k AT 37.5°C
*MATCH 0.05%
6.19k = VISHAY S-102
OPERATE LTC6943 WITH
±5V SUPPLIES
LOCK-IN AMPLIFIER TECHNIQUE
USED TO EXTRACT VERY SMALL
SIGNALS BURIED INTO NOISE
6943 • TA13
10
6943f
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