VOLTAGE-TO-FREQUENCY/
FREQUENCY-TO-VOLTAGE CONVERTERS
TC9400
TC9401
TC9402
V+ = 8V TO 15V (FIXED)
1
R2
0.9
R1
GAIN
ADJUST
5V
8.2
kΩ
2
kΩ
OFFSET
ADJUST
RIN
1MΩ
VIN
0V–10V
0.2
R1
820
pF
2
10kΩ
fOUT
10kΩ
fOUT/2
V2
0.01
µF
14
2
6
8
7
VREF
0.01 11
µF
12
5
180
pF 3
IIN
IIN
100 kΩ
1
4
9
TC9400
10
3
4
R1
R2
V+
10V
1 MΩ 10kΩ
12V 1.4 MΩ 14kΩ
15V
2 MΩ 20kΩ
fOUT = IIN
×
1
(V2–V7) (CREF)
(VIN–V2)
(V+–V2)
+
IIN=
RIN
(0.9 R1+0.2 R1)
Figure 4 . Fixed Voltage — Single Supply Operation
+12 to +15V
1.2k*
14
VDD
11 THRESHOLD
DETECT
CINT
12 AMP OUT
CREF 5 CREF
TC9400
3 IIN
fOUT 8
2 ZERO
ADJUST
6 GND
10
fOUT/2
D1
5.1VZ
0.1µ
7 V
REF
1 I
BIAS
100k
OUTPUT 9
COMMON
5
10k
10k
1µF
R1
910k
R3
GAIN
R4
100k
D2
5.1VZ
6
7
100k
R2
910k
R5
91k
OUTPUT
FREQUENCY
INPUT
VOLTAGE
(0 to 10V)
Rp
OFFSET
20k
ANALOG GROUND
VSS
4
DIGITAL
GROUND
COMPONENT SELECTION
F/S FREQ.
1 kHz
10 kHz
100 kHz
C
REF
2200pF
180pF
27pF
C
INT
4700pF
470pF
75pF
Figure 5.
Voltage to Frequency
3-295
8
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
