AN5278 Просмотр технического описания (PDF) - Panasonic Corporation

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AN5278

4.8 W ×1 (18 V, 8 Ω) Power Amplifier with Volume and Tone Control

Panasonic Corporation 

ICs for Audio Common Use

AN5278

s Technical Information (continued)

2.Application Note (continued)

2) Tone characteristics

When the tone control voltage (VT, at Pin3) is changed from 2.5 V to 5 V, the high frequency gain is increased

gradually up by a max. of 9 dB. When VT is changed from 2.5 V to 0 V, the high frequency gain is decreased

gradually down by a max. of −11 dB.

By increasing the value of the capacitor at Pin2, the treble cut can be further decreased.

Tone = 5 V

30 dB

+9 dB

Tone = 2.5 V

−11 dB

Tone = 0 V

1

15

Frequency (kHz)

3) Volume characteristic

The volume characteristic is logarithmic type. When the volume control voltage (VV, at Pin4) is 5 V, the gain is at

max. (30 dB) ; that is, there is no attenuation. When VV is decreased, the gain is decreased at the same time. When

VV is 0 V, the gain is at its minimum ; that is, there is max. attenuation, −69 dB.

0

Tone = 2.5 V

−69

0

1

2

3

4

5

Voltage (V)

4) Dynamic range

The AN5278 has been designed, specially to have as large an input dynamic range as possible. The input D-range

is about 4.5 V[rms], or 12.7 V[p-p] (conditions of measurement : VCC = 18 V, adjust the gain downwards by

decreasing the volume control voltage).

7

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