TC9402EJD【PDF 11/28 页】IC V-FREQ/FREQ-V CONV 14CDIP

?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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