MSM7732-01 OKI [OKI electronic componets], MSM7732-01 Datasheet - Page 6

• Manufacturer Part Number: MSM7732-01
• Description: Audio CODEC
• Manufacturer: OKI [OKI electronic componets]

PIN FUNCTIONAL DESCRIPTION
AIN+, AIN–, GSX
Transmit analog inputs and the output for transmit gain adjustment.
AIN– connects to inverting input of the internal transmit amplifier. AIN+ connects to non-inverting input of the
internal transmit amplifier. GSX connects to the internal transmit amplifier output. Refer to Figure 1 for gain
adjustment.
VFRO, SAO, AOUT+, AOUT–, PWI
Receive analog outputs and the outputs for receive gain adjustment.
VFRO is the receive filter output for the voice signal. SAO is the receive filter output for an acoustic component of
the sound tone. SAO can directly drive 32 Ω load. AOUT+ and AOUT– are differential analog signal outputs
which can directly drive a 32 Ω load. Refer to Figure 1.
OKI Semiconductor
0.1 µF
Vi
Figure 1 Analog Input/Output Interface
10 µF
Sounder output signal
+
–
Vo = V
C1
VFRO
R1
(R3/R4) ×2
R3
R4
R2
GSX
AIN+
AIN–
AOUT–
SAO
AOUT+
PWI
VFRO
SG
+
–
–1
Transmit Gain:
V
GSX
VREF
/Vi
to ENCODER
Conv.
D/A
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MSM7732-01
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