ICs for Audio Common Use
s
Technical Information (continued)
•
Volume control (continued)
AN5270
Alternative responses of volume control may be obtained by addition of a diode across the resistor R4.
Configuration B :
R4
18 kΩ
Config. B
A
C
Configuration C :
R4
18 kΩ
0 0.6 V
Volume DC Pin4 (V)
5V
2.2
µF
10 kΩ
12 kΩ
2.2
µF
12 kΩ
Volume
attenuation
Fig. Volume characteristics of AN5270
•
Tone control
The tone cotrol range is 0 to 5 V. Please adopt the same PWM configration as suggested for the volume control.
The variable range of tone control is about 20 dB, depending on the values of R1 · C1 components that are connected
to Pin3.
Internally, there is a LPF formed by Ri
=
47 kΩ and a Miller capacitor which is formed by Ci
=
33 pF and the gain
amplifier G
=
40. The cut-off frequency is thus :
1
=
2.5 kHz
2π · G · Ci · Ri
To achieve a rich deep-bass effect, the tone control should be adjusted to minimum (0 V). To achieve a bright treble
effect, the tone control should be adjusted to maximum.
•
V
CC
requirement
V
CC1
should be fixed at 12 V. Achieve best performance by obtaining this supply from a 12 V voltage regulator output.
7
PANASONIC [ PANASONIC SEMICONDUCTOR ]
