LT1011 Datasheet, PDF (12/16 Pages) Linear Technology – Voltage Comparator

LT1011/LT1011A
TYPICAL APPLICATIONS
4-Digit (10,000 Count) A/D Converter
15V
R1
1k
R2
18k
1
ZERO
TRIM
3 _LF398
25
5V
R3
7
4
8
6
D1
3.9k
–15V
C1*
R4
0.1µF
5.6k
R8
3k
15V
START
≥12ms
INPUT
0V TO 10V
15V
C4
0.01µF
R5
4.7k
8
2₊
LT1011
3_–
R7
4
D2
22Ω
–15V
C2**
15pF
C3
0.1µF
C5
0.01µF
67
1
15V
R11
6.8K
5V
R6
4.7K
CLOCK
1MHz
D3
R10
1k
R9 FULL-SCALE
D4
3.65k TRIM
R12
6.8k
2N3904
C6
LM329
50pF
ALL DIODES: 1N4148
*POLYSTYRENE
**NPO
1011 TA19
OUTPUT = 1 COUNT
PER mV, f = 1MHz
Capacitance to Pulse Width Converter
TTL OR CMOS
(OPERATING
ON 5V)
T_H ≥ [C_MAX (pF)][1µs/pF]
T_L ≥ 10 • C_MAX • (1µs/pF)
D1
R2
R1 ^100k
5k _R3
86.6k
+
10µF^†
C**
GAIN ADJ
5V
8
2₊
LT1011
3_–
4
0.01µF
67
1
R5
4.7k
OUTPUT
1µs/pF
( ) *PW = (R2 + R3)(C) R1 + R4 , INPUT CAPACITANCE OF
R1
LT1011 IS ≈ 6pF. THIS IS AN OFFSET TERM.
**TYPICAL 2 SECTIONS OF 365pF VARIABLE
CAPACITOR WHEN USED AS SHAFT ANGLE
INDICATION
†_{THESE COMPONENTS MAY BE ELIMINATED IF}
NEGATIVE SUPPLY IS AVAILABLE (–1V TO –15V)
D3^†
D2^†
10µF^†
1011 TA20
12