an5270 Panasonic Corporation of North America, an5270 Datasheet - Page 5

• 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
Note) * 1 : This is the response if LF pin is open (i.e. R1 open).
Structure of pre-amp. stage (continued)
Gain calculation
Technical Information (continued)
G
G
amp. is connected to the input signal. Thus, the output of G
frequency
G
If LF pin is left open, then G
General formula for gain of pre-amp. is (when vol.
By vector analysis as shown in fig. Vector diagram of G
G
F
T
B
G
G
where G
V
amp., the flat-amp., amplifies the signal equally for all frequencies in the range of 20 Hz to 70 kHz.
amp., the treble or tone-amp., has an internal LPF connected to its inverting input. The non-inverting input of G
amp., the bass-amp., amplifies the lower range of frequencies. Its cut-off frequency is determined by R1· C1.
V
V
[dB]
[dB]
G
pre
* 1
G
G
G
G
G
Z3
100 Hz
L1
F
B
T
P
B
2.5 kHz).
G
G
20 log
G1
L1
pre
· (G
0.5
1.3
5.4
25 dB
Z3 · 0.848
f
Z3
tan
2
G
0
1.3 for (1 kHz)
2.5 for (10 kHz)
1
F
P
[G
1
(2 f · C1 · 6600)
for (100 Hz)
L1
R1
(2 f · C1 · 6600)
G
T
· (G
6600
) G
B
1 kHz
Fig. Frequency response of AN5270
amp. has no effect on the overall frequency response.
G2
F
B
3 dB
G
· G
f
T
1
)
L2
2
G
B
· G
L2
10 kHz
· cos ]
G3
max., tone
pre
2
3 dB
,
T
(G
passes only the upper range of frequencies (cut-off
B
G1 : Gain at 100 Hz
G2 : Gain at 1 kHz
G3 : Gain at 10 kHz
f
f
1
2
· G
: High frequency cut-off when Pin3 is open.
: Low frequency cut-off
max.) :
L2
Fig. Vector diagram of G
· sin )
Tone max.
Tone min.
2
G
G
pre
B
G
· G
P
L2
G
L1
· (G
f
F
pre
G
T
)
AN5270
5
T