msm7532 Oki Semiconductor, msm7532 Datasheet - Page 8

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

¡ Semiconductor
The DC clamp level is V
CPDL
Input DC voltage reference level definition pin for compander.
One of the voltages into which the voltage between V
should be supplied to this pin. Refor to the V
If the potential difference between this pin and the SGO pin is V
input reference levels are expressed as follows.
The compressor input reference level and expander input reference level change simultaneously.
SGI
Built-in signal ground that is reference voltage to be supplied to analog circuit.
The DC voltage is one half of the supply voltage.
When the power has fewer noises and fewer ripples, the idle noise can be improved by inserting a
bypass capacitor over 1 mF between SGI and GND, and between SGI and V
of noises, do not insert a bypass capacitor between SGI and V
Other capacitors and resistors should be connected to the SGO pin.
SGO
Signal ground voltage output pin for LSI external circuits.
The DC voltage is one half of the supply voltage.
Insert a 1 mF capacitor between SGO and GND.
BR
MODEM data signaling rate switching input.
CE3P, CE3N
Pins used to connect a capacitor for defining a time constant of output transient response for the
expander.
Insert a 0.22 mF capacitor between CE3N and CE3P.
LIML
generation circuit
SG
SG voltage
V
ICS
V
BR
0
1
LIML
= V
From LPF1
IES
.
Data Signaling Rate
= 20 · log (V
Inverter
To internal circuit
+
–
1200 bps
2400 bps
+
–
REF
Limiter
description for voltage division by the resistors.
REF
CPDL
pin and SGO pin is divided by the resistors
) – 5.8 (dBV)
SGI
SGO
DD
CPDL
Note
SW8
To splatter filter
C25
to reduce supply noises.
V
, the compressor and expander
DD
C2
C3
DD
. If the power has a lot
MSM7532
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