LT1011/LT1011A
U
TYPICAL APPLICATIONS
4-Digit (10,000 Count) A/D Converter
15V
INPUT
0V TO 10V
15V
ZERO
TRIM
R1
1k
C4
R5
4.7k
5V
0.01µF
R2
18k
8
C5
0.01µF
R6
2
1
+
4.7K
6
1
7
LT1011
2
OUTPUT = 1 COUNT
PER mV, f = 1MHz
3
3
5
CLOCK
1MHz
LF398
4
–
6
R7
5V
4
7
22Ω
D1
D2
–15V
R3
8
3.9k
15V
–15V
C1*
0.1µF
C2**
15pF
C3
0.1µF
R11
6.8K
R4
5.6k
R8
3k
R10
D3
D4
1k
15V
R9
3.65k
FULL-SCALE
TRIM
R12
6.8k
2N3904
C6
50pF
LM329
ALL DIODES: 1N4148
*POLYSTYRENE
**NPO
1011 TA19
START
≥12ms
Capacitance to Pulse Width Converter
T
T
≥ [C
MAX
≥ 10 • C
(pF)][1µs/pF]
MAX
H
L
• (1µs/pF)
D1
TTL OR CMOS
(OPERATING
ON 5V)
GAIN ADJ
5V
R2
100k
R1
5k
R1 + R4
R1
*PW = (R2 + R3)(C)
, INPUT CAPACITANCE OF
(
)
R3
86.6k
8
0.01µF
R5
4.7k
LT1011 IS ≈6pF. THIS IS AN OFFSET TERM.
2
3
+
–
+
6
1
**TYPICAL 2 SECTIONS OF 365pF VARIABLE
CAPACITOR WHEN USED AS SHAFT ANGLE
INDICATION
†
7
OUTPUT
1µs/pF
10µF
LT1011
4
†
THESE COMPONENTS MAY BE ELIMINATED IF
NEGATIVE SUPPLY IS AVAILABLE (–1V TO –15V)
C**
†
D3
†
†
10µF
D2
+
1011 TA20
12
Linear [ Linear ]
