LA4802 SANYO [Sanyo Semicon Device], LA4802 Datasheet - Page 3

• Manufacturer Part Number: LA4802
• Description: Headphone Stereo Power Amplifier
• Manufacturer: SANYO [Sanyo Semicon Device]

Notes on the Beep Tone Output Function
Notes on the Muting Time
Notes on the Bass Compensation Circuit
• 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 V
• The muting on time and the muting off time can be modified by changing the value of the external capacitor C4
• The on/off times will change as shown below when the value of C4 is varied.
• We recommend operating the mute switch at the same time as the power on/off switch (pin 1) to minimize impulse
• When the headphone load is connected to the output, the low frequencies will be attenuated due to the output
• 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
beep tone output, V
connected to pin 6. The recommended value for C4 is 1 µF. With lower values, impulse noise levels will increase.
noise at power on and off.
capacitors. This circuit compensates for that attenuation and creates frequency response characteristics that are close
to flat.
bass frequency characteristics will be somewhat increased. Therefore we recommend leaving the bass compensation
circuit off in this case.
Output pin
Load terminal
+
0.47 µF
0.1 µF
1 µF
C4
O
BEEP, will be 2.7 V rms, and when muting is on, the output will be 1.3 Vrms.
MUTE S. W
PWR S. W
V CC
On time
0.2 ms
1 ms
2 ms
A13554
Off time
40 ms
80 ms
9 ms
LA4802T
–10
–12
–14
–16
–2
–4
–6
–8
2
0
10
IN
= 2.4 Vp-p. When the muting function is off, the
100
Frequency, f — Hz
VG — f
A13553
1000
1k
No. 6657-3/10
10k