an5270 Panasonic Corporation of North America, an5270 Datasheet - Page 7

• Manufacturer Part Number: an5270
• Description: 4.3 W X 1 8ohm Power Amplifier With Volume Control And Tone Control
• Manufacturer: Panasonic Corporation of North America

ICs for Audio Common Use
Volume control (continued)
Tone control
V
Technical Information (continued)
Alternative responses of volume control may be obtained by addition of a diode across the resistor R4.
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
amplifier G
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
CC1
attenuation
Volume
requirement
2 · G · Ci · Ri
should be fixed at 12 V. Achieve best performance by obtaining this supply from a 12 V voltage regulator output.
1
0 0.6 V
40. The cut-off frequency is thus :
Config. B
2.5 kHz
A
Volume DC Pin4 (V)
C
47 k and a Miller capacitor which is formed by Ci 33 pF and the gain
Fig. Volume characteristics of AN5270
5 V
Configuration B :
Configuration C :
2.2 F
2.2 F
10 k
18 k
R4
18 k
R4
AN5270
12 k
12 k
7