an12940aa Panasonic Corporation of North America, an12940aa Datasheet - Page 11

• Manufacturer Part Number: an12940aa
• Description: Audio Signal Processing Ic For Notebook Pc
• Manufacturer: Panasonic Corporation of North America

■ Terminal Equivalent Circuits (continued)
Pin No.
12
45
48
10
47
9
Pin 12,
Pin 45
V
V
V
Pin 10,
Pin 47
REG
REG
REG
(4.5 V)
(4.5 V)
(4.5 V)
9 kΩ
Equivalent Circuits
6.3 kΩ
6.3 kΩ
9 kΩ
9 kΩ
SDC00044AEB
Pin 48
Pin 9,
Pin 13,
Pin 44
Alarm mix amplifier
It is the negative feedback of the mix
amplifier to mix an alarm signal and
an audio signal. It is possible to
adjust in the direction which lowers
the gain of the mix amplifier in
putting resistance among above
mentioned mix amplifier output pins.
Between pin 12 and pin 13
Between pin 44 and pin 45
The entry impedance:
Audio signal mix amplifier
It is the output of the mix amplifier to
mix a signal from the modem, the
beep, the PCcard to an audio signal.
The output impedance:
Revision amplifier entry:
It is the amplifier entry to adjust an
output level to the HP amplifier.
It becomes the entry of the EVR
adjustment signal.
The entry impedance:
Pin 12: R-channel negative feedback pin
Pin 45: L-channel negative feedback pin
Pin 48: The L-channel output
Pin 9: The R-channel output
Equal to or less than about 10 Ω
Equal to or less than about 10 Ω
The High impedance
negative feedback pins:
: about 9 kΩ
: about 9 kΩ
Description
output pin:
AN12940AA
Corrugation
and Voltage
AC −19 dBV
AC −19 dBV
DC 2.25 V
DC 2.25 V
DC 
11