UTCMC34018 Datasheet, PDF (11/14 Pages) Unisonic Technologies – VOICE SWITCHED SPEAKER-PHONE CIRCUIT

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
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