an12940aa Panasonic Corporation of North America, an12940aa Datasheet - Page 8

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

AN12940AA
■ Terminal Equivalent Circuits (continued)
8
Pin No.
25
26
31
32
27
31
23
34
22
24
30
3.6 kΩ
V
(5.0 V)
Equivalent Circuits
CC
_SP

18 kΩ
22
Pin 31,
Pin 32,
Pin 25,
Pin 26
Pin 30,
Pin 33,
Pin 24,
Pin 27
SDC00044AEB
Speaker Output:
It is output pins of the speaker
amplifier. It becomes BTL output.
The L-channel negative phase output pin:
The R-channel positive phase output pin:
The R-channel negative phase output pin:
To reduce voltage loss by the wire
resistance in maximum output, it makes Pin 26, pin 27
output 2 pins.Also, when the speaker
amplifier saves power, too, DC voltage
is maintained.
The output impedance:
GND:
It is GND pin for the speaker amplifier.
Because the big electric current flows,
it is desirable to separate from the
GND line to the other GND pin on
the board pattern. Also, it isn't con-
nected with the substrate potential in
the IC.
Audio signal automatic detection
It outputs the distinction result of the
audio signal automatic detection circuit.
The output form is the open collector
output from of the NPN transistor.
Therefore, the pull rises and uses for
the power by the external resistance
( equal to or more than 10 kΩ ).
Signal's there being: Output high
Signal nothing
Open collector output
The electric current ability:
The L-channel positive phase output pin:
Equal to or less than 10 Ω
Equal to or more than 100 µA
Pin 23 is for R-channel
Pin 34 is for L-channel
distinction output:
Description
Pin 32, pin 33
Pin 30, pin 31
Pin 24, pin 25
Pin 26, pin 27
: Output low
and Voltage
Corrugation
Pin 30, pin 31
Pin 32, pin 33
Pin 24, pin 25
Signal nothing
Signals there
AC 4 dBV
DC 2.2 V
DC 0 V
DC 0 V
DC 5 V
positive
being