msm7708-02 Oki Semiconductor, msm7708-02 Datasheet - Page 7

• Manufacturer Part Number: msm7708-02
• Description: Serial Register Interface Adpcm Codec For Telephone Recording
• Manufacturer: Oki Semiconductor

¡ Semiconductor
SAO
Differential analog output for a sounder.
Variable tones including "Audio sound", "DTMF tone", "S tone", "F tone", and "R tone", and
telephone call signals can be output to either VFRO pin or SAO pin by CR0 - B1 of the control
register. These output pins are in the high impedance state during power down.
Vi
Differential analog input signal
Transmit gain : (V
= (R2/R1) ¥ (R4/R3)
Receive gain : (V
= 2 ¥ (R6/R5)
Z
L
= 120 nF
+
–
+ 350 W
Sounder output signal
C1
C1
C2
GSX2
O
/V
/V
VFRO
Analog output signal
Vo
I
)
R1
R1
R3
)
Figure 1 Analog Interface
R6
R5
R2
R4
R2
AIN1+
AIN1–
GSX1
SGT
AIN2
GSX2
PWI
AOUT+
AOUT–
VFRO
SAO
–
+
–
+
–1
–
+
to ENCODER
Reference
generator
voltage
from
DECODER
MSM7708-02
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