an12940aa Panasonic Corporation of North America, an12940aa Datasheet - Page 15

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

■ Terminal Equivalent Circuits (continued)
Pin No.
40
39
38
36
V
40
REG
220 kΩ
44 kΩ
V
8 kΩ
8 kΩ
38
REG
(4 V)
216 kΩ
96 kΩ
48 kΩ
(4.5 V)
80 kΩ
Equivalent Circuits
120 kΩ
V
V
REG
15 kΩ
61 kΩ
REG
240 kΩ
40 kΩ
(4.5 V)
(4.5 V)
80 kΩ
90 Ω
36
SDC00044AEB
39
AGC detection pin:
It is the detection circuit to detect the
signal level of the AGC circuit of the
SP output for the clip prevention. It
connects a condenser for the detection.
The entry impedance: Unsettled
AGC on/off control pin:
It is the pin which controls the operating
operation of the AGC circuit of the
SP output for the clip prevention in
on/off. At the time of off, the AGC
circuit doesn't work.
The entry impedance: About 76 kΩ
Offset cancellation pin:
It is the condenser connection pin of
the offset cancellation circuit to remove
the DC offset voltage of the signal
which enters a distinction circuit in
the audio signal automatic detection
system. As the principle, it composes
HPF by entry impedance "R" and
connection condenser "C".
The entry impedance: About 80 kΩ
It changes AGC-on level:
It is the pin which changes the on
level of AGC.
Low : The standard level
Open: −1 dB of standards
High : −3 dB of standards
The entry impedance: About 120 kΩ
High: AGC-on
Low: AGC-off
Description
AN12940AA
and Voltage
Corrugation
DC 0 to 1 V
DC 2.25 V
DC 1.5 V
DC 
15