TC9400COD Ver la hoja de datos (PDF) - TelCom Semiconductor Inc => Microchip

Número de pieza

componentes Descripción

Fabricante

TC9400COD

VOLTAGE-TO-FREQUENCY/FREQUENCY-TO-VOLTAGE CONVERTERS

TelCom Semiconductor Inc => Microchip 

VOLTAGE-TO-FREQUENCY/

FREQUENCY-TO-VOLTAGE CONVERTERS

1

TC9400

TC9401

TC9402

fIN

SEE

FIGURE

6

TC9400A

TC9401A

TC9402A

+5V

14

VDD

Ϭ2

THRESHOLD

DETECT

11

3 µsec

DELAY

THRESHOLD

DETECTOR

OFFSET

ADJUST

+5V

2 kΩ

–5V

100kΩ 2 ZERO ADJUST

2.2kΩ

IBIAS

1

10 kΩ

VSS

4

VREF

7

–

OP

AMP

+

VREF

(TYPICALLY –5V)

Figure 7. DC — 10 kHz F/V Converter

V+

2

*

fOUT/2 10

OUTPUT

V+

COMMON 9 *

3

*

fOUT 8

* OPTIONAL

IF BUFFER

IS NEEDED

VREF

4

OUT 5

12pF

IIN 3

CREF

56 pF

SEE

EQUATION,

PAGE 12

60pF

AMP

OUT 12

RINT

1 MΩ

CINT

1000pF

VO

5

GND

6

6

0.5µsec

MIN

INPUT

fOUT

fOUT/2

5.0µsec

MIN

DELAY = 3µsec

Figure 8 . F/V Digital Outputs

TELCOM SEMICONDUCTOR, INC.

Input Buffer

fOUT and fOUT/2 are not used in the F/V mode. However,

these outputs may be useful for some applications, such as

7 a buffer to feed additional circuitry. Then, fOUT will follow the

input frequency waveform, except that fOUT will go high

3µsec after fIN goes high; fOUT/2 will be squarewave with a

frequency of one-half fOUT.

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

connected to ground.

8

3-297

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