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