msm7532 Oki Semiconductor, msm7532 Datasheet - Page 9

• Manufacturer Part Number: msm7532
• Description: Single Chip Msk Modem With Compandor For Cordless Telephone
• Manufacturer: Oki Semiconductor

¡ Semiconductor
RAIO, RAI
Pins used to constitute RC-active filter on the receive signal input side.
Refer to the TVIO and TVI description.
If the Scrambler circuit is used, using the first order RC-active filter is recommended. In this case,
configure the filter so that either R34 or R35, or both of them, is 60 kW or less.
<First order RC-active filter configuration>
CSH
CE1, CE2
Pins used to connect a capacitor for removing DC offset in the expander.
Insert a 0.22 mF capacitor between CE1 and SGO, an 1 mF capacitor between CE2 and SGO.
EMP
Emphasis path selection pin.
RVO
Receive voice signal output pin.
The RVO state is controlled depending on the digital data set to RVE.
VOL1, VOL2
Pins used to set up a gain for the electronic volume.
The volume at the stage next to expander is controlled by the pins.
Pin used to connect a capacitor for removing DC offset in shaper of modem receiver.
Insert a 1 mF capacitor between this pin and GND.
EMP
0
1
Pre-emphasis circuit is bypassed to the path
Pre-emphasis circuit is connected to the path
In the case of fc = 10 kHz, gain : 0dB
C19
Transmit side
RVE
0
1
R34
No signal output (voltage = V
Output of signals input to RAI and RAIO
R35
VOL2 VOL1 Gain
C27
0
0
1
1
RVO
1
0
1
0
De-emphasis circuit is bypassed to the path
De-emphasis circuit is connected to the path
R34 = R35 = 51 kW
C19 = 0.22 mF, C27 = 300 pF
–12 dB
RAIO
RAI
SG
+6 dB
–6 dB
0 dB
)
–
+
Receive side
Note
SW7
VRAI
MSM7532
Note
SW2
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