Datasheet

16
LT1028/LT1128
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
Super Low Distortion Variable Sine Wave Oscillator
1028/1128 TA10
–
+
LT1028
C2
0.047
R2
R1
C1
0.047
2k
20Ω
20Ω 2k
10pF
5.6k
15µF
+
22k
10k
–
+
LT1055
1V
RMS
OUTPUT
1.5kHz TO 15kHz



WHERE R1C1 = R2C2
f =
1
2πRC
()
MOUNT 1N4148s
IN CLOSE PROXIMITY

TRIM FOR
LOWEST
DISTORTION
100k
10k
20k
2N4338
560Ω
2.4k
4.7k
LT1004-1.2V
15V
<0.0018% DISTORTION AND NOISE.
MEASUREMENT LIMITED BY RESOLUTION OF
HP339A DISTORTION ANALYZER
1028/1128 TA11
–
+
LT1052
10Ω
0.1
30k
10k
15V
7
6
4
2
3
8
1
–15V
0.1
0.01
15V
68Ω
–
+
LT1028
130Ω
1
7
8
4
–15V
INPUT
OUTPUT
1N758
1N758
100k
2
3
Chopper-Stabilized Amplifier
Low Noise Infrared Detector
1028/1128 TA12
10Ω
1M
1k
10k
5V
–
+
LT1028
7
6
4
2
3
8
–5V
1000µF
DC OUT
5V
39Ω
33Ω
+
267Ω
10Ω
+
+
OPTICAL
CHOPPER
WHEEL
IR
RADIATION
PHOTO-
ELECTRIC
PICK-OFF
INFRA RED ASSOCIATES, INC.
HgCdTe IR DETECTOR
13Ω AT 77°K
1/4 LTC1043
30pF
100µF
100µF
13
14
16
10k* 10k*
SYNCHRONOUS
DEMODULATOR
–
+
LT1012
7
4
2
3
–5V
6
5V
1
8
12
–
+
LM301A
7
4
2
3
–5V
6
5V
1
8