TC9402EJD【PDF 15/28 页】IC V-FREQ/FREQ-V CONV 14CDIP

?2007 Microchip Technology Inc.

DS21483D-page 15

TC9400/9401/9402

FIGURE 6-2: F/V Single Supply F/V Converter.

6.3 Input Buffer

F

OUT

and F

OUT

/2 are not used in the F/V mode. How-

ever, these outputs may be useful for some applica-

tions, such as a buffer to feed additional circuitry. Then,

F

OUT

will follow the input frequency waveform, except

that F

OUT

will go high 3祍 after F

IN

goes high; F

OUT

/2

will be square wave with a frequency of one-half F

OUT

.

If these outputs are not used, Pins 8, 9 and 10 should be

connected to ground (see Figure6-3 and Figure6-4).

FIGURE 6-3: F/V Digital Outputs.

Offset

Adjust

10k?/DIV>

.01礔

6.2V

IN914

33k?/DIV>

100k?/DIV>

500k?/DIV>

0.1礔

100k?/DIV>

V+ = 10V to 15V

1

47pF

V

OUT

Frequency

Input

TC9400

6

10k?/DIV>

2

11

1.0

4

14

12

3

5

GND

V

REF

OUT

I

IN

Zero

Adjust

V

REF

I

BIAS

Amp Out

V

DD

V

SS

GND

6

7

1.0k?/DIV>

V+

1.0k?/DIV>

0.01礔

.001礔

DET

Note: The output is referenced to Pin 6, which is at 6.2V (Vz). For frequency meter applications,

a 1mA meter with a series scaling resistor can be placed across Pins 6 and 12.

M?/DIV>

0.5ms

Min

5.0ms

Min

Delay = 3ms

Input

F

OUT

F

OUT

/2

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