LA4802 データシートの表示（PDF） - SANYO -> Panasonic

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LA4802

Headphone Stereo Power Amplifier

SANYO -> Panasonic 

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

0.1 µF

0.47 µF

1 µF

On time

0.2 ms

1 ms

2 ms

Off time

9 ms

40 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.

+

Output pin

Load terminal

A13554

2

0

–2

Bass compensation applied

–4

VG — f

–6

–8

–10

–12

–14

–16

10

100

1000

1k

10k

Frequency, f — Hz

No. 6657-3/10

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