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參數(shù)資料
| 型號： | AN12942B |
| 廠商： | PANASONIC CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Audio signal processing IC for notebook PC |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO56 |
| 封裝： | 0.300 INCH, PLASTIC, HSOP-56 |
| 文件頁數(shù)： | 27/31頁 |
| 文件大?。?/td> | 577K |
| 代理商： | AN12942B |
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27
SDC00047AEB
AN12942B
Application Notes (continued)
4. Automatic power save of speaker amplifier function
When input signal becomes zero or very small, a speaker amplifier is automatically power save off.
In the case that a detection circuit operation error to noise, insert “R” and “C” between pin 12 and pin 11 to prevent operation error.
However, that insertion of “R” causes input signal to attenuate.
Setting L-channel, R-channel input of
58 dBV (Vol
=
1.65 V) as detection threshold, insertion of “R” would drive detection
threshold value up for the above gain..
C
DET
of pin 7is capacitor to determine detection time.
f
C
=
2
π
RC
1
Gain
=
20 log
R
+
20 k
20 k
Automatic off
(Detection time until audio output)
Measurement conditions
V
CC
, V
CC
_SP
=
5 V
Signal input
→
Time difference until speaker output
Measure time difference from signal input (sine wave) at no signal status until
speaker output.
Speaker output (load 8
)
=
4 dBV, f
=
1 kHz
Automatic power save on
(No sound
→
Time until power save)
Measurement conditions
V
CC
,V
CC
_SP
=
5 V
Input signal off
→
Time difference until speaker power save
Measure time difference from switching speaker signal (sine wave) output
to no input until speaker power save.
Speaker output (load 8
)
=
4 dBV, f
=
1 kHz
Det.capacity vs detection time
(Input signal off
→
Speaker automatic power save on)
Det.capacity vs detection time
(Signal input
→
Speaker automatic power save off)
D
μ
s
0
0.01
200
150
100
50
0.1
1
Det. capacity (Pin 7) (
μ
F)
D
0
0.01
2
1.5
1
0.5
0.1
1
Det. capacity
(Pin 7) (
μ
F)
28
EVR
Signal
Det.
20 k
C
DET
12
11
7
V
REF
27
EVR
R
C
OFFSET
CANCEL
OFFSET
CANCEL
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