Datasheet

LTC1052/LTC7652
14
1052fa
No V
OS
Adjust* CMOS DAC Buffer—Single Supply Air Flow Detector
TYPICAL APPLICATIO S
U
1Hz to 30MHz Voltage-to-Frequency Converter
5V = NO AIR FLOW
0V = AIR FLOW
5
7
2
8
4
5V
1
3
0.1µF
240Ω
10k
AIR FLOW
43.2Ω
± 1%
LTC1052/7652 • TA08
6
TYPE K
0.1µF
–
+
–
+
AMBIENT
TEMPERATURE
STILL AIR
1k
100k
± 1%
LT1004-1.2
+
–
LTC1052
*OFFSET VOLTAGE CAUSES
NONLINEARITY ERRORS.
SEE: “APPLICATION GUIDE
TO CMOS MULTIPLYING D/A
CONVERTERS,”
ANALOG DEVICES, INC.
10k
15V
LTC1043
12
+
–
LTC1052
6
7
2
8
4
1
3
0.1µF
0.1µF
11
43k
4
≈ – 0.5V
1µF
NON POLARIZED
1N914
1/2
17
V
OUT
1pF
15
5
1k
12–BIT CMOS DAC
C
F
*
l
OUT1
R
FB
l
OUT2
15V
15V
0.1µF
6 5
15
16
FOR HIGHER SPEED, REFER TO
“FAST PRECISION INVERTER”
UNDER TYPICAL APPLICATIONS
LTC1052/7652 • TA07
+
0.22µF
5V
TRIGGER
HP5082-2810
1Hz TO 30MHz
OUTPUT
LT1004–1.2V
11
5
14
3
7
1
5V
10
7490
74S741/2
5V
12
14
5
0.3Hz/°C ZERO-DRIFT
±0.08% LINEARITY
20ppm/°C GAIN DRIFT
150dB DYNAMIC RANGE
*TRW MTR-5/ + 120ppm/°C
†WESCO #32-P/ – 120ppm/°C
10k
7
2
8
4
5V
1
3
–5V
10k
1000M
1Hz TRIM
CHARGE
PUMP
LTC1052/7652 • TA09
6
0.22µF
0.1µF
1/2
LTC1043
2k
30MHz
TRIM
IN
OV TO 3V
–5V
100k
STABILIZING
AMP
16.2k*
12
11
100pF
†
14
10
16
0.1µF
0.0.1µF
OUT
+
–
LTC1052
CURRENT
SOURCE
12k
120Ω
5V
7.5k
2N3906
120Ω
0.1µF
FET BUFFER
2N5486
100pF
50Ω
RESET DIODE
2N3904
50Ω
NC
5V
–5V
2k
74S132
100k
13
7
1
2N5486
8