an12940aa Panasonic Corporation of North America, an12940aa Datasheet - Page 10

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

AN12940AA
■ Terminal Equivalent Circuits (continued)
10
Pin No.
17
16
41
14
43
13
44
Pin 12,
Pin 45
V
REG
220 kΩ
Pin 16,
Pin 41
V
44 kΩ
8 kΩ
8 kΩ
(4.5 V)
REG
Equivalent Circuits
(4.5 V)
6.3 kΩ
6.3 kΩ
V
REF
50 kΩ
(2.25 V)
V
9 kΩ
REG
80 kΩ
100 Ω
(4.5 V)
17
SDC00044AEB
Pin 14,
Pin 43
Pin 13,
Pin 44
Signal automatic detection function
We change an audio signal automatic
detection function in on/off. In case
of automatic detection off, it controls
power saving by speaker with the
manual with the power saving on/off
pin.
High: Function on
Low: Function off
The entry impedance:
Speaker amplifier entry:
It is the voice input pins of the speaker
amplifier. To make offset voltage in
power saving on/off changing by the
Speaker amplifier amplifier little, it
combines capacity.
( It makes pop noise small ).
Pin 16: R-channel SP amplifier entry
Pin 41: L-channel SP amplifier entry
The entry impedance: About 50 kΩ
AGC amplifier output:
It is the output pin of the AGC circuit AC −16 dBV
to hold an output clip in excessive
output of the speaker output.
The output impedance:
Alarm mix amplifier output pins:
It is output pins of the mix amplifier to AC −16 dBV
mix an alarm signal and an audio signal.
The output impedance:
Pin 14: The AGC R-channel output
Pin 43: The AGC L-channel output
Equal to or less than about 10 Ω
Equal to or less than about 10 Ω
The high impedance
Pin 13: R-channel output
Pin 44: L-channel output
on/off control pin:
Description
and Voltage
Corrugation
AC −16 dBV
DC 2.25 V
DC 2.25 V
DC 2.25 V
DC 