Datasheet LTC6943 (Analog Devices) - 10

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