UTCMC34018 查看數據表（PDF） - Unisonic Technologies

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UTCMC34018

VOICE SWITCHED SPEAKER-PHONE CIRCUIT

Unisonic Technologies 

UTCMC34018 LINEAR INTEGRATED CIRCUIT

Fig 2 Transmit attenuator versus RTX

+20

+10

0

-10

Max Gain

Vacf=6.0mV

-20

-30

Max Attenuation

-40

Vacf=150mV

-50

RR=30k ohms

VLC=VB

-60

-70

10k

100k

1M

RTX (ohms)

Fig 4 Gain and attenuation versus

Resisrtor Ratio

+20

+10

GRX vs RRX/RR

Vacf=150mV

GTX vs RTX/RR

Vacf=6.0mV

0

-10

-20

-30

ARX vs RRX/RR

Vacf=6.0mV

-40

-50

-60

ATX vs RTX/RR

Vacf=150mV

VLC=VB

-70

0.1

1.0

10

Ratio

Fig 3 Receive attenuator versus RRX

+20

+10

0

-10

Max Gain

Vacf=6.0mV

-20

-30

-40

-50

RR=30k ohms

VLC=VB

-60

-70

Max Attenuation

Vacf=150mV

Usable range

1k

10k

RRX (ohms)

100k

Fig 5 Attenuation Gain versus VLC

+10

RRX=18k ohms

RTX=91k ohms

RR=30k ohms

0

GTX

GRX

-10

Circuit in

receive

mode

-20

-30

-40

0

Mimimum

recommended

level

0.2

0.4

0.6

0.8

1.0

UTC

UNISONIC TECHNOLOGIES CO., LTD. 11

QW-R108-006,A

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