msm7532 Oki Semiconductor, msm7532 Datasheet - Page 4

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

¡ Semiconductor
PIN AND FUNCTIONAL DESCRIPTIONS
TVE
Transmit voice signal output control pin.
Refer to the TAO pin description.
RVE
Receive voice signal output control pin.
Refer to the RVO pin description.
PDN
Power down control pin.
The four-step power down modes are controlled by the PDN, ME, RVE, and TVE pins.
In Mode 5, all the circuits are ON.
The MODEM demodulation circuit and FD pin are reset to zero by setting to Mode 1 or Mode 2 (PDN
= “1”, RVE = “0”).
After turning the power ON, set the LSI into one of these modes, then reset it before using. To hold
the voice signal processing section ON during transmission of MSK signals, set the ME and TVE pins
to "1". In this case, the input from TVI is not output to TAO. Refer to the TAO pin description.
FDE
Pin used to control the function of frame synchronous signal detection circuit.
If digital "0" is entered in this pin, the FD pin remains reset at "0" level. The RT and RD pins are always
active.
If digital "1" is entered in this pin, the frame synchronous signal detection circuit becomes active.
And the RT and RD pins are fixed at "1" level until the FD pin goes to "1" level by detecting the frame
synchronous signals.
Refer to Figure 3 "Receive Signal Timing".
BYP
Compander path selection pin.
When the expander is used, the maximum gain of expander is limited to approximately +12 dB. This
tendency will appear as the input signal level is increased when V
is smaller (e,g., 0.1 V); the input/output characteristics then change automatically from expander
characteristics to linear characteristics with constant gain.
BYP
0
1
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
Compressor is connected to the path.
Compressor is bypassed to the path.
PDN RVE TVE
1
1
1
0
Other than above
0
0
1
0
Transmit side
X
1
0
0
ME
X
X
X
1
Processing Section
Voice signal
OFF
OFF
OFF
OFF
ON
Transmit Modem Receive Modem
Expander is connected to the path.
Expander is bypassed to the path.
OFF
OFF
OFF
ON
ON
Receive side
DD
is larger (e. g., 5 V) and V
OFF
OFF
ON
ON
ON
Oscillation Circuit
X: Don't care
MSM7532
Crystal
OFF
ON
ON
ON
ON
Note
SW1
CPDL
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