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LTC6943 Datasheet(PDF) 10 Page - Linear Technology |
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LTC6943 Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page LTC6943 10 6943f Voltage Controlled Current Source with Ground Referred Input and Output 6943 • TA11 7 12 1µF 100Ω VIN 100Ω INPUT 0V TO 2V IOUT = 1/2 LTC6943 11 14 10 9 6 1k 4 1 8 5V 2 3 1µF 0.001µF OPERATES FROM A SINGLE 5V SUPPLY 0.68µF 5V 3 – + 15 1/2 LT1013 TYPICAL APPLICATIO S Lock-In Amplifier (= Extremely Narrow-Band Amplifier) 6943 • TA13 11 1/4 LTC6943 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 5V –5V 2 6.19k 100k 10k* 10k* 100Ω 0.01µF47µF 6.19k 1 4 3 6.19k T1 500Hz SINE DRIVE THERMISTOR BRIDGE IS THE SIGNAL SOURCE SYNCHRONOUS DEMODULATOR RT 3 6 – + LT1007 5V 5V –5V ZERO CROSSING DETECTOR 2 3 4 1 8 1k 0.002 PHASE TRIM 50k 10k 7 5V –5V 3 2 1M 1µF – + LT1056 5V –5V 2 3 4 6 – + LT1012 VOUT = 1000 • DC BRIDGE SIGNAL 10 12 14 – + LT1011 * + |
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