LTC1043M View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1043M Datasheet PDF : 16 Pages
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LTC1043
TYPICAL APPLICATIO S
Lock-In Amplifier (= Extremely Narrow-Band Amplifier)
THERMISTOR BRIDGE
IS THE SIGNAL SOURCE
SYNCHRONOUS
DEMODULATOR
10k*
10k*
T1
500Hz
SINE DRIVE 4
1 6.19k
6.19k
5V
5V
3+
6
1/4 LTC1043
2–
LM301A
5V
3
LT1007
RT
6.19k 2 –
13
100k
12 3 +
8
1
2–
1M
6
LT1012
–5V
14
16
– 5V
30pF
3+
4
1µF
100Ω
– 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 LTC1043 WITH
±5V SUPPLIES
LOCK-IN AMPLIFIER TECHNIQUE
USED TO EXTRACT VERY SMALL
SIGNALS BURIED INTO NOISE
LTC1043 • A013
50MHz Termal RMS/DC Converter
5V
5V
300mV
10VRMS
INPUT
N
T2
1A
GRN
30k*
30k*
10k
0.01µF
10k
RED
RED
T2A
T1B T2B GRN
4
1/2 LTC1043
6
5
2
1µF
1µF
3
16
18
15
1µF
17
BRN
5V
3+ 8
LT1013
2–
4
1µF
0.01µF
CALIBRATION ADJUST
5V
1
20k
5+
100k*
LT1013
6–
301Ω* 10k
7
DC OUTPUT
0V TO 3.5V
10k
10k
*1% RESISTOR
2% ACCURACY DC 50MHZ
100:1 CREST FACTOR CAPABILITY
T1 TO T2 = YELLOW SPRINGS INST. CO.
THERMISTOR COMPOSITE
ENCLOSE T1 AND T2 IN STYROFOAM
LTC1043 • A14
1043fa
11
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