?2007 Microchip Technology Inc.
DS21483D-page 11
TC9400/9401/9402
Trimming the reference voltage is not recommended
for high accuracy applications unless an op amp is
used as a buffer, because the TC9400 requires a low-
impedance reference (see Section2.5 Voltage Ref-
erence (VREF), V
REF
pin description, for more infor-
mation).
The circuit of Figure4-2 will directly interface with
CMOS logic operating at 12V to 15V. TTL or 5V CMOS
logic can be accommodated by connecting the output
pull-up resistors to the +5V supply. An optoisolator can
also be used if an isolated output is required; also, see
Figure4-3.
FIGURE 4-2:    Voltage-to-Frequency.
R1
910k?/DIV>
R4
1礔
D2
5.1 VZ
R2
910k?/DIV>
R5
91k?/DIV>
Rp
Offset
20k?/DIV>
100k?/DIV>
D1
5.1 VZ
0.1礔
100k?/DIV>
C
REF
C
INT
1.2k?/DIV>
+12 to +15V
10   10k?/DIV>
Output
Frequency
Digital
Ground
Analog Ground
Input
Voltage
(0 to 10V)
R3
Gain
TC9400
11
12
5
3
2
6
7
1
4
14
9
10
8
Threshold
Detect
Amp Out
C
REF
I
IN
Zero Adjust
GND
V
REF
I
BIAS
Output
Common
F
OUT
/2
F
OUT
V
DD
V
SS
100k?/DIV>
k?/DIV>
Component Selection
F/S Freq.   C
REF
C
INT
1kHz   2200pF 4700pF
10kHz   180pF  470pF
100kHz   27pF   75pF
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