ml7074a-003 Oki Semiconductor, ml7074a-003 Datasheet - Page 18

• Manufacturer Part Number: ml7074a-003
• Description: Voip Codec
• Manufacturer: Oki Semiconductor

These are the analog transmit input and transmit level adjust pins. Each of AIN0N and AIN1N is connected to each
Notice:
It is recommended to select the amplifier to be used before the conversation starts, since a small amount of noise
These are analog receive output pins and are connected to the output pins of the built-in receive amplifiers AMP2
Notice:
It is recommended to select the amplifier to be used before the conversation starts, since a small amount of noise is
At the time of resetting or releasing from the reset state, it is recommended to select the AVREF as outputs of
of the inverting input pins of the built-in transmit amplifiers AMP0 and AMP1, and AIN0P is connected to the
non-inverting input pin of AMP0. In addition, GSX0 and GSX1 are connected to the output pins of AMP0 and
AMP1, respectively. The selection between AMP0 and AMP1 is made by CR10-B0. See Fig. 9 for the method of
making level adjustment. During the power down mode (when PDNB = “0” or CR0-B7 = “1”), the outputs of
GSX0 and GSX1 go to the high impedance state. If AMP0 is not used in the specific application of this LSI, short
GSX0 with AIN0N and connect AIN0P with AVREF. When AMP1 is not used, short GSX1 with AIN1N.
will be generated if the amplifier selection is changed while conversation is in progress.
and AMP3, respectively. The output signals of VFRO0 and VFRO1 can be selected using CR10-B1 and CR10-B2,
respectively. When selected (“1”), the received signal will be output, and when deselected (“0”), the AVREF
signal (about 1.4 V) will be output. In the power down mode, these pins will be in the high impedance state. It is
recommended to use these output signals via DC coupling capacitors.
generated if the output selection is changed while the conversation is in progress.
VFRO0 and VFRO1.
PIN FUNCTION DESCRIPTIONS
AIN0N, AIN0P, GSX0, AIN1N, GSX1
VFRO0, VFRO1
OKI Semiconductor
G ain = R2/R1 <= 63(+36dB)
R1 : Variable
R2 : Max 500k
G ain = R4/R3 <=63(+36dB)
R3 : Variable
R4 : Max 500k
O ut : Max 1.3Vp-p
O ut : Max 1.3Vp-p
Fig. 9 Analog interface
2.2 to 4.7
C1
C2
C5
µ
F
R3
R1
+
C4
R4
R2
C3
C6 0.1
VFR O 0
VFR O 1
AVREF
AIN0N
AIN0P
AIN1N
G SX0
G SX1
µ
F
10k
10k
Ω
Ω
AMP2
AMP0
AMP1
AMP3
10k
1 0 κ Ω
Ω
VREF
CR10-B0
CR10-B2
CR10-B1
A/D
D/A
FEDL7074-003FULL-01
ML7074-003 GA
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