an12949a Panasonic Corporation of North America, an12949a Datasheet - Page 24

• Manufacturer Part Number: an12949a
• Description: Audio Power Ic For Note Pc
• Manufacturer: Panasonic Corporation of North America

AN12949A
Technical Data (continued)
The explanation of the function for mainly (continued)
Note) The characteristics listed below are reference values based on the IC design and are not guaranteed.
2. AGC attack time (continued)
5)
4) AGC short time Recovery
Output THD at AGC ON
It is 0.2 s when the signal input time of the level that AGC moves is short.
0.01
It is the test wave shape which a person's conversation and so on was presumed. (continue signal input short)
Establishment time is being decided inside the IC, and it can't be changed.
100
0.01
0.1
100
10
0.1
Test wave shape of AGC short time recovery.
10
1
1
-40
Input Level versus Output THD (AGC OFF)
-40
Sin wave signal (f = 400 Hz)
Input Level versus Output THD
AGC output level : 9.0dBV
-30
ON time
0.2 s
-30
Input Level [dBV]
Input Level [dBV]
-20
–6 dBV
-20
OFF time
20 s
-10
-10
0
It can get the output which distortion is scarce in because there is
"AGC" even if an input level is too big.
–16 dBV
10
0
VCCSP = 5 V
RL = 8 Ω
f = 1 kHz
VCCSP = 5 V
RL = 8 Ω
f = 1 kHz
SDF00043BEB
It is the output wave shape of AGC short time recovery
Output does a clip if it is not the input level which made the
one for Amp. gain low from the output level of the amplifier.
0.01
100
0.1
10
1
It can get the output which distortion is scarce in because
there is "AGC" even if an input level is too big.
-40
SP_OUTR
VCC = VCCSP = 5 V, RL = 8 Ω
Input Level versus Output THD
AGC On Level 8.1dBV
-30
Input Level [dBV]
-20
0.2 s
-10
0
0.2 s/div
10
(BTL output)
VCC = 3.3 V
VCCSP = 5 V
RL = 8 Ω
f = 1 kHz
2 V/div
24