參數(shù)資料
型號: AN5270
廠商: PANASONIC CORP
元件分類: 音頻/視頻放大
英文描述: 4.3 W X 1(8ohm) Power Amplifier with Volume Control and Tone Control
中文描述: 4.3 W, 1 CHANNEL, AUDIO AMPLIFIER, PSFM9
文件頁數(shù): 5/9頁
文件大?。?/td> 82K
代理商: AN5270
5
ICs for Audio Common Use
AN5270
I
Technical Information (continued)
Structure of pre-amp. stage (continued)
G
F
amp., the flat-amp., amplifies the signal equally for all frequencies in the range of 20 Hz to 70 kHz.
G
T
amp., the treble or tone-amp., has an internal LPF connected to its inverting input. The non-inverting input of G
T
amp. is connected to the input signal. Thus, the output of G
T
passes only the upper range of frequencies (cut-off
frequency
=
2.5 kHz).
G
B
amp., the bass-amp., amplifies the lower range of frequencies. Its cut-off frequency is determined by R1· C1.
If LF pin is left open, then G
B
amp. has no effect on the overall frequency response.
Gain calculation
General formula for gain of pre-amp. is (when vol.
=
max., tone
=
max.) :
G
pre
=
G
L1
· (G
F
+
G
T
)
G
B
· G
L2
By vector analysis as shown in fig. Vector diagram of G
pre
,
G
V
[dB]
=
G
pre
+
G
P
G
V
[dB]
=
20 log
[G
L1
· (G
F
+
G
T
)
G
B
· G
L2
· cos
θ
]
2
+
(G
B
· G
L2
· sin
θ
)
2
+
G
P
where G
L1
=
0.5
G
F
=
1.3
G
B
=
5.4
0
for (100 Hz)
G
T
=
1.3 for (1 kHz)
2.5 for (10 kHz)
G
P
=
25 dB
G
B
Z3 · 0.848
Z3
+
R1
Z3
=
6600
1
+
(2
π
f · C1 · 6600)
2
=
tan
1
(2
π
f · C1 · 6600)
θ
Note) *1: This is the response if LF pin is open (i.e. R1 open).
θ
G
pre
G
B
· G
L2
Fig. Vector diagram of G
pre
G
L1
· (G
F
+
G
T
)
G
V
*1
G1 : Gain at 100 Hz
G2 : Gain at 1 kHz
G3 : Gain at 10 kHz
f
1
: High frequency cut-off when Pin3 is open.
f
2
: Low frequency cut-off
Tone
=
max.
3 dB
Tone
=
min.
G1
G2
G3
Fig. Frequency response of AN5270
f
2
1 kHz
10 kHz
f
1
f
100 Hz
3 dB
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