Datasheet

11
LT1011/LT1011A
TYPICAL APPLICATIONS
U
Combining Offset Adjust and Strobe
–
+
LT1011
6
1011 TA13
5
10k
1k
TTL OR CMOS
5V
20k
V
+
Direct Strobe Drive When CMOS* Logic
Uses Same V
+
Supply as LT1011
–
+
LT1011
6
*NOT APPLICABLE FOR TTL LOGIC
1011 TA14
8
V
+
–
+
LT1011
5
7
1011 TA15
6
1
R
L
20k
R
H
*
5k
V
+
HYSTERESIS IS ≈0.45mV/µA OF
CURRENT CHANGE IN R
H
THIS RESISTOR CAUSES HYSTERESIS
TO BE CENTERED AROUND V
OS
*
**
2R
H
**
Combining Offset Adjustment and Hystersis
–
+
LT1011
2
**
3
1
4
7
8
*
**
†
1% METAL FILM
TRW TYPE MTR-5/120ppm/°C, 25k ≤ R
S
≤ 200k
C1: 0.015µF = POLYSTYRENE, –120ppm/°C,
±30ppm WESCO TYPE 32-P
NOTE: COMPARATOR CONTRIBUTES ≤10ppm/°C DRIFT
FOR FREQUENCIES BELOW 10kHz
LOW DRIFT AND ACCURATE FREQUENCY ARE
OBTAINED BECAUSE THIS CONFIGURATION
REJECTS EFFECTS DUE TO INPUT OFFSET
VOLTAGE AND BIAS CURRENT OF THE
COMPARATOR
1k
10k*
10k*
1011 TA16
15V
10k*
74HC04
×6
BUFFERED
OUTPUT
15V
C1
0.015µF
15V
Low Drift R/C Oscillator
†
+
LT1011
1
2
6
8
1011 TA17
OUTPUT
3
7
8
15V
3
INPUT
2k
1M**
2
4
C1*
2µF
–15V
10k
100pF
–
+
LT1008
*
**
MYLAR
SELECT FOR REQUIRED RESET TIME CONSTANT
Positive Peak Detector
+
LT1011
1
2
6
8
1011 TA18
OUTPUT
3
7
8
–
+
15V
3
2k
1M**
2
INPUT
4
C1*
2µF
*
**
MYLAR
SELECT FOR REQUIRED RESET TIME CONSTANT
–15V
10k
100pF
–
+
LT1008
Negative Peak Detector