TC9400/9401/9402
FIGURE 5-2:
VOLTAGE TO FREQUENCY
+12 to +15V
1.2k
14
V
DD
1µF
Threshold
Detect
11
12
5
R
910k
R
4
100k
1
C
INT
10k
10k
Amp Out
D
5.1VZ
2
C
REF
C
REF
R
3
TC9400
Gain
3
2
6
I
8
IN
F
OUT
Zero Adjust
100k
10
9
Output
Frequency
GND
F
/2
OUT
R
910k
R
5
2
D
1
5.1VZ
91k
0.1µ
Output
Common
7
1
V
REF
Rp
I
BIAS
Offset
20k
V
100k
SS
Digital
Ground
Input
Voltage
4
(0 to 10V)
Analog Ground
Component Selection
CREF
CINT
F/S FREQ.
2200pF 4700pF
1kHz
180pF
27pF
470pF
75pF
10kHz
100kHz
FIGURE 5-3:
FIXED VOLTAGE - SINGLE SUPPLY OPERATION
V+ = 8V to 15V (Fixed)
R
2
14
10kΩ
V
2
0.9
1
2
6
5V
R
8
F
OUT
0.01
µF
8.2
kΩ
Gain
Adjust
TC9400
10kΩ
7
10
F
/2
V
2
kΩ
OUT
REF
11
0.01
µF
Offset
Adjust
0.2
1
12
5
R
R
1MΩ
820
pF
IN
180
pF
3
I
IN
V
IN
0V–10V
I
1
4
9
IN
100kΩ
R
R
2
1
V+
1
F
= I
IN
OUT
–
(V
V ) (C
)
REF
10V
1MΩ 10kΩ
2
7
12V 1.4MΩ 14kΩ
15V
2MΩ 20kΩ
(V – V )
IN
(V+ – V )
2
2
+
=
I
IN
R
(0.9R + 0.2R )
1 1
IN
2002 Microchip Technology Inc.
DS21483B-page 11
MICROCHIP [ MICROCHIP ]
