an5270 Panasonic Corporation of North America, an5270 Datasheet - Page 6

• 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

AN5270
6
Cut-off frequencies
Summary of frequency characteristics for typical values of R1 and C1
Volume control
Technical Information (continued)
f
f
The volume control range is 0 to 5 V. This range is adopted so as to simplify the pull-up of typical PWM output from
micro-computer IC. The following simplified PWM output configuration is suggested :
The high input impedance of the volume control pin makes the input current extremely small, so that it is not
necessary to have an external buffer at the PWM output.
Configuration A :
Note) * : Tone max.
1
2
R1( )
2.2 k
2.2 k
5.1 k
2 · G · Ci · Ri
2 · R1 · C1
5.1k
10 k
20 k
10 k
20 k
1 k
3 k
1
1
Volume
control
control
Treble
300
300
0.039
0.039
0.039
0.039
C1(F)
0.1
0.1
0.1
0.1
0.1
0.1
Table. Tabulated summary of frequency characteristics of AN5270.
530 Hz
4
5
2.5 kHz
Fig. Volume control interface circuit for AN5270
C4
G1(100 Hz)
where G
if R1
35.0
31.0
26.0
17.5
24.0
36.0
34.0
33.0
31.0
26.0
18.0
2.2 F
3 k , C2
18 k
Actual Gain(dB)*
R4
40 times, Ci
G2(1 kHz)
34.0
31.0
27.5
25.0
26.0
35.0
32.0
31.0
29.0
27.0
26.0
0.1 F
R5
5 V
33 pF, R1
12 k
G3(10 kHz)
31.0
31.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
30.0
ICs for Audio Common Use
47 k
PWM output
f
1.8 k
1.6 k
2
800
408
204
723
530
312
159
(Hz)
80
Micro-
computer
IC
G
10.0
21.0
21.0
18.0
14.0
10.0
19.0
21.0
19.0
17.0
16.0
TC
(dB)