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參數(shù)資料
| 型號(hào)： | LA4802T |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.038 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| 封裝： | MSOP-20 |
| 文件頁(yè)數(shù)： | 4/10頁(yè) |
| 文件大?。?/td> | 281K |
| 代理商： | LA4802T |
No. 6657-3/10
LA4802T
Notes on the Beep Tone Output Function
This function provides a beep tone output under control of the system microcontroller.
The beep tone can be provided regardless of the on/off state of the muting function.
The recommended beep input signal level is a square wave with VIN = 2.4 Vp-p. When the muting function is off, the
beep tone output, VOBEEP, will be 2.7 V rms, and when muting is on, the output will be 1.3 Vrms.
Notes on the Muting Time
The muting on time and the muting off time can be modified by changing the value of the external capacitor C4
connected to pin 6. The recommended value for C4 is 1 μF. With lower values, impulse noise levels will increase.
The on/off times will change as shown below when the value of C4 is varied.
C4
On time
Off time
0.1 μF
0.2 ms
9 ms
0.47 μF
1 ms
40 ms
1 μF
2 ms
80 ms
We recommend operating the mute switch at the same time as the power on/off switch (pin 1) to minimize impulse
noise at power on and off.
VCC
MUTE S. W
PWR S. W
A13553
Notes on the Bass Compensation Circuit
When the headphone load is connected to the output, the low frequencies will be attenuated due to the output
capacitors. This circuit compensates for that attenuation and creates frequency response characteristics that are close
to flat.
This function can be turned on or off from pin 4. When used as a line output, the load will be less than 16 Ω, and the
bass frequency characteristics will be somewhat increased. Therefore we recommend leaving the bass compensation
circuit off in this case.
A13554
+
Output pin
Load terminal
–14
–12
–10
–8
–6
–4
–2
0
2
–16
10
100
1000
1k
10k
VG — f
Frequency, f — Hz
No
bass
compensation
Bass
compensation
applied
Voltage
gain,
VG
—
dB
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