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PDF AN12942B Data sheet ( Hoja de datos )
| Número de pieza | AN12942B | |
| Descripción | Audio signal processing IC for notebook PC | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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ICs for Audio Common Use
AN12942B
Audio signal processing IC for notebook PC
Overview
AN12942B is an one-chip IC for the stereo speakers which can output 1 W by 8 Ω, headphone amplifiers, line amplifiers, and
electronic volumes.
The AGC circuit is built-in to prevent the resonance or the vibration by the speaker’s energy and the clipping distortion what is
called "broken up sound".
Also the AN12942B is built-in power saving on/off function automatically detecting input signal to save the power of speaker
amplifier.
Features
• Speaker amplifier
1 W × 2-channel: 8 Ω, VCC = 5 V
• Built-in AGC circuit
Prevention of the resonance or the vibration due to the speaker and the clipping distortion by AGC at excessive input signal
(with AGC on/off switch).
• Built-in automatic power saving function.
It detects input signals and switches on/off (with the on/off switch for the auto power saving).
• Built-in headphone amplifier and line amplifier
Applications
• Notebook PC
Package
• Dual surface implementing package (HSOP056-P-0300A)
Type
• Silicon monolithic bipolar IC
Publication date: June 2003
SDC00047AEB
1
1 page  
AN12942B
Absolute Maximum Ratings
A
No.
Parameter
Symbol
Rating
1 Supply voltage
VCC
VCC_SP
5.75
5.75
2 Supply current
ICC
3 Power dissipation
PD 517
4 Storage temperature
Tstg −55 ∼ +150
5 Operating ambient temperature
Topr
−20 ∼ +75
Note) *1: The values under the condition not exceeding the above absolute maximum ratings and the power dissipation.
*2: When using this IC, referring to the technical data in page 17, observe the power dissipation characteristic curve.
Be sure to use the IC so that the power dissipation of the IC without heat sink will not exceed 517 mW at Ta = 75ºC.
*3: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25ºC.
Operating Supply Voltage Range
Parameter
Symbol
Range
Operating supply voltage range
VCC
VCC_SP
4.50 ∼ 5.50
4.50 ∼ 5.50
Note) *: The values under the condition not exceeding the above absolute maximum ratings and the power dissipation.
Unit
V
A
mW
ºC
ºC
Unit
V
Note
*1
*2
*3
*3
Note
*
SDC00047AEB
5
5 Page 
AN12942B
Technical Data
• Circuit diagrams of the input/output part and pin function descriptions
Note) The characteristics listed below are reference values based on the IC design and are not guaranteed.
Pin Waveform
No. and voltage
Inner circuit
Impedance
Description
1, VCC_SP
56 DC: 5.0 V
Power supply pins specifically designed
for speaker amplifiers.
• Pin 1 for R-channel.
• Pin 56 for L-channel.
Because the big electric current flows, it
is desirable to separate from the VCC line
to the other power supply pins on the
board pattern.
Speaker output
Pin 52, pin 53
52, Pin 2, pin 3
53, Positive phase
54,
55,
Pin 54, pin 55
2, Pin 4, pin 5
3, Negative phase
4,
5
DC: 2.20 V
AC: 4 dBV
VCC_SP
(5.0 V)
18k
3.6k
Pin 52,
pin 53,
pin 2,
pin 3
Pin 54,
pin 55,
pin 4,
pin 5
The output
impedance: Equal
to or less than 1 Ω
Output pins of speaker amplifiers.
It becomes BTL output.
• Pin 54, pin 55 for L-channel positive
phase output
• Pin 52, pin 53 for L-channel negative
phase output
• Pin 2, pin 3 for R-channel positive
phase output
• Pin 4, pin 5 for R-channel negative
phase output
To reduce voltage loss caused by the
wire resistance in maximum output, it
makes output 2 terminals.
When the speaker amplifiers save power,
DC voltage is also kept.
51, GND_SP
6 DC : 0.0 V
It is GND pin for the speaker amplifier.
• Pin 6 is for R-channel.
• Pin 51 is for L-channel.
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 connected with the
substrate potential in the IC.
Line mute
31 control
25 k
31
The base entry
(With the
resistance)
It controls on/off of the mute function of
In the range which the line output.
entry limiter does
not depend on, it is
high impedance.
SDC00047AEB
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AN12942B.PDF ] | |
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