¡ Semiconductor
MSM7532
MICO, MICN, MICP
MICN is the microphone amplifier inverting input pin, MICP is the non-inverting input pin, and
MICO is the output pin. Only during power down mode 1 or 2, the amplifier is powered down and
the MICO potential is undefined.
These pins can also be used for applications other than microphone amplifier.
V
DD
Output
MICO
MICN
–
+
MICP
CMPI
Input pin to the compressor.
Connect this pin to the TVIO pin with a 0.1
mF
capacitor in order to prevent the malfunction of the
compressor which may occur if DC input offset exists.
TAO
Transmit analog signal output pin.
According to control data on ME and TVE, TAO is set as shown below.
ME
0
0
1
TVE
0
1
X
TAO
No signal output (potential = V
SG
)
Voice signal output (signal from TVI, TVIO)
MSK modulator output
Note
SW6
SW5
X: Don't care
UAI, UAO
Inverting input pin (UAI) and output pin (UAO) for the amplifier available for users.
These pins are used as a gain control amplifier that can match the internal signal level of the LSI with
the input level of the radio circuit.
The amplifier can drive a resistance over 2 kW.
In the power down mode 1 and 2, the amplifier enters power down mode.
Since the amplifier uses the power supply for the built-in transmitter, the amplifier should be used
to control signals for the transmitter. C28 is a capacitor for oscillation prevention. Be sure to use a
capacitor of 20 pF or more. If this amplifier is not used, connect UAI to UAO directly and remove R1,
R2, C1, and C28.
C1
R1
R2
C28
TAO
UAO
UAI
+
–
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OKI [ OKI ELECTRONIC COMPONETS ]
