an12949a Panasonic Corporation of North America, an12949a Datasheet - Page 21

• 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. Operation of AGC
1) AGC ON level
Output waveform at sine wave signal input
Note) Four evaluation boards were used, and the same signal was inputted at the same time, and output wave shape was taken.
AGC On level can be chosen from Po = 1.2 W, 1.0 W, 0.8 W, 0.5 W (RL = 8 Ω).
SP_OUTR(+): RL = 8 Ω, VCC = VCCSP = 5 V
The AGC circuitry can activate to minimize distortion, raising the average volume level and it can prevent speaker from
breaking when an input level is too high.
A speaker can protect it even if doesn't change the establishment of the input signal level by setting up an AGC on level in
accordance with the allowable input value of the speaker.
SDF00043BEB
200 μs/div
AGC OFF
AGC ON, Po = 1.0 W Level
AGC ON, Po = 0.8 W Level
AGC ON, Po = 0.6 W Level
AGC ON, Po = 0.5 W Level
1 V/div
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