an12949a Panasonic Corporation of North America, an12949a Datasheet - Page 23

• 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)
3) AGC recovery time
"AGC Recovery Time” can be set up from 1 s, 2 s, 4 s, 8 s.
Input waveform for AGC recovery time observation
Output waveform at AGC recovery time (BTL output waveform)
Recovery time: 1.0 s
Recovery time: 4.0 s
SP_OUTR
VCC = VCCSP = 5 V, RL = 8 Ω
( AGC_Recovery 1, 2: Pin 43, 42 = Low, Low )
( AGC_Recovery 1, 2: Pin 43, 42 = High, Low )
SP_OUTR
VCC = VCCSP = 5 V, RL = 8 Ω
Sin wave signal (f = 40 Hz)
ON time
5 s
4 s
1 s
–6 dBV
OFF time
20 s
2 s/div
2 s/div
–16 dBV
SDF00043BEB
2 V/div
2 V/div
It is the test wave shape which the signal input that a thing in such
cases as the music signal continued was presumed.
Output amplitude is enlarged gradually at the time when it is
decided by a setup of AGC recovery time.
Set up the establishment of "Attack time" in the point which a
sense of incongruity is scarce in. Confirm it by using the speaker
mounted on the set at the signal such as music.
Recovery time: 2.0 s
Recovery time: 8.0 s
( AGC_Recovery 1, 2: Pin 43, 42 = Low, High )
( AGC_Recovery 1, 2: Pin 43, 42 = High, High )
SP_OUTR
VCC = VCCSP = 5 V, RL = 8 Ω
SP_OUTR
VCC = VCCSP = 5 V, RL = 8 Ω
8 s
2 s
2 s/div
2 s/div
2 V/div
2 V/div
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