an12940aa Panasonic Corporation of North America, an12940aa Datasheet - Page 9

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

■ Terminal Equivalent Circuits (continued)
Pin No.
21
15
20
37
42
55
19
18
200 kΩ
96 kΩ
19
21
116 kΩ
124 kΩ
Equivalent Circuits
V
REG
9 kΩ
(4.5 V)

96 kΩ
V
(5.0 V)
V
CC
REG
_SP
100 Ω
200 kΩ
40 kΩ
40 kΩ
(4.5 V)
SDC00044AEB
18
Audio automatic detecting detection
pin:
It connects a condenser for the peak
detection. It is the circuit which detects
a peak after rectifying the audio signal
of the audio signal automatic detection
circuit in both waves. By changing a
capacity value, the time which the
power saving depends on in case of
the switchover which is without
signal with signal's there being can be
changed.
Signal less time:
Signal's there being:
The output impedance:
GND:
It is the GND pin of the signal system.
It is connected with the substrate potential
of the IC. Pin 15, pin 42 connect with
the lead frame of the IC.
V
It is the standard voltage pin to fix the
DC bias of the speaker output. It
connects a condenser to remove a
ripple.
The output impedance: About 60 kΩ
Change the audio signal detection
sensitivity:
It is the pin to change the detections
sensitivity of the audio signal
automatic detection circuit. 2 choices
of the high sensitivity mode and the
low sensitivity mode are possible and
it is possible to about 6 dB change
sensitivity.
Low: Low sensitivity mode
High: High sensitivity mode
The output impedance: About 105 kΩ
REF
About 200 Ω
(SP):
Constant current source
Emitter follower
Description
AN12940AA
voltage in case
and Voltage
Corrugation
Signal nothing
Signals there
DC 1.45 V
of opening
DC 2.2 V
DC 0 V
DC 2 V
DC 0 V
being
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