TC9400_06 Datasheet, PDF(16/24 Page) Microchip Technology – Voltage-to-Frequency/Frequency-to-Voltage Converters

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TC9400_06 Datasheet, PDF (16/24 Pages) Microchip Technology – Voltage-to-Frequency/Frequency-to-Voltage Converters

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TC9400/9401/9402

V+ = 10V to 15V

10k

6.2V

6 GND

VDD

.01 Î¼F

10k

TC9400

100k

Frequency

Input

Offset

Adjust

33k

500k

0.01 Î¼F

VREF OUT 5

2 Zero

Adjust

V+

IIN 3

IN914

1.0k

11 DET

1.0M IBIAS

Amp Out 12

GND

VREF VSS

0.1 Î¼F

1.0k

100k

47 pF

1M .001 Î¼F

VOUT

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.

FIGURE 7-2:

F/V Single Supply F/V Converter

7.3 Input Buffer

FOUT and FOUT/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,

FOUT will follow the input frequency waveform, except

that FOUT will go high 3Î¼sec after FIN goes high;

FOUT/2 will be square wave with a frequency of

one-half FOUT.

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

connected to ground (see Figure 7-3 and Figure 7-4).

0.5msec

Min

Input

FOUT

FOUT/2

FIGURE 7-3:

5.0msec

Min

Delay = 3msec

F/V Digital Outputs

DS21483C-page 16

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