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Número de pieza

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NJW1124

Voice Switched Speakerphone circuit

Japan Radio Corporation  

NJW1124

400

1040

MCO

TLO2

300

1020

200

1000

100

980

0

960

-100

940

-200

920

⊿VA

-300

900

-400

880

0

1

2

3

4

5

6

time [m sec]

Response example.1

MCO vs. TLO2signal (starting input)

MCO = 200mVrms/1kHz C5 = 0.1µF

400

MCO

TLO2

300

1040

1020

200

1000

100

980

0

-100

960

δVc

940

-200

920

-300

900

-400

0

880

5

10

15

20

25

30

35

40

time [m sec]

Response example.2

MCO vs. TLO2signal (finishing input)

MCO = 200mVrms/1kHz C5 = 0.1µF

10000

Minumum Sensitivity Voltage

Maximum Input Voltage

1000

Maximum Input Voltage(Vin(Fig.8)),which equal

to MCO or FO Maximum Output Voltage

Minimum Input Voltage(sensitivity),which is the Voltage

shifting mode(idle to receive, idle to transmit).

100

Note: Maximum Voltage is defined by the smaller resister,

35% value of R5, R11 or R4, R11 value.

10

1

10

100

Input Resistance[kΩ]

Fig.9 Minimum Input Voltage vs. Input Resistance

(R4 or R12 Theoretical Value resistance

R4=R5,R12=R11 condition)

– 20 –

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