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NJW1124

Voice Switched Speakerphone circuit

Japan Radio Corporation  

NJW1124

1.Receive Attenuator

Receive Attenuator has 3 modes depending on base and satellite unit condition.

PARAMETER

SYMBOL

TEST CONDITION

MIN.

Receive Attenuator Gain 1

Receive Attenuator Gain 2

Receive Attenuator Gain 3

GR1

RX-mode (Receive)

3.0

GR2

TX-mode (Transmit)

-43

GR3

Idle-mode

(Standby),CPT=CPR=V+

-17

TYP.

6.0

-46

-20

1.Receive Attenuator Gain 1 , (Receive mode :Gain=+6dB)

Condition: Receive signal from satellite unit, and no transmit signal to base unit.

2. Receive Attenuator Gain 2 , (Transmit mode :Gain=-46dB)

Condition: Transmit signal to base unit, and no receive signal from satellite unit.

3. Receive Attenuator Gain 3 , (Idle mode :Gain=-20dB)

Condition: Transmit signal to base unit, and no receive signal from satellite unit.

MAX.

9.0

-50

-23

UNIT

dB

dB

dB

Volume Control

Receive Attenuator includes Volume Control.

Volume is controlled by resister value connected

to VCL pin.

Fig.2 shows Volume attenuate vs. Resister value.

Volume max.(0dB) : 0Ω,

Volume min. (-40dB): 100kΩ .

Transmit Attenuator doesn’t equip Volume Control.

0

-10

-20

-30

-40

0

20

40

60

80

100

VLC Resistor [kΩ]

Fig.2 Volume vs. VCR Resister

– 14 –

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