參數(shù)資料
型號(hào)： CXA1946CR
廠商： Sony Corporation
英文描述： Electronic Volume
中文描述： 電子音量
文件頁(yè)數(shù)： 19/23頁(yè)
文件大?。?/td> 365K
代理商： CXA1946CR
– 19 –
CXA1946BQ/BR
4. Tone control
The configuration of the tone control circuit is shown in Fig. 4. C
TCLCX2
and C
TCHCX
are connected
externally, and the tone control frequency characteristics can be changed by changing these constants.
The relationships between C
TCLCX2
/C
TCHCX
and the frequency characteristics are as follows:
1/f
L
= 2
π
C
TCLCX2
(R
3
//R
4
)
1/f
H
= 2
π
C
TCHCX
R
5
The maximum bass boost and cut can be made smaller than in the Application Circuit by connecting an
external resistance to the TCLCX1 pin in series, or else connecting an external resistance to C
TCLCX2
in
parallel. (See Fig. 5.) Furthermore, the maximum treble boost and cut can be made smaller than in the
Application Circuit by connecting an external resistance to C
TCHCX
in series. (See Fig. 6.) However, when
these methods are used, variations in the absolute value of the CXA1946B internal resistance (±20% max.)
and in the external resistance will cause variations in the tone control characteristics. Set these constants
after studying all considerations carefully. Note that when the method illustrated in the Application Circuit is
used, variations in the internal resistance of the CXA1946B have no effect on the tone control
characteristics.
The input impedance is 19k
(typ.) for TIN1 and TIN2.
The output impedance for TCO1 and TCO2 is low impedance (roughly 0
). The tone step width and gain
are not affected by the load impedance.
Fig. 4. Tone Control
TCOX
14.1k
14.1k
12k
TCLCX1
TCLCX2
C
TCLCX2
0.39μ
R4
8k
BASS
CUT
ON
OFF
ON
OFF
BOOST
14.1k
14.1k
12k
10k
10k
10k
10k
R5
5k
CUT
ON
OFF
ON
OFF
BOOST
TREBLE
TCHCX
C
TCHCX
0.0027μ
R3
8k
f
H
f
L
Tone control frequency
characteristics
input impedance
19k
TINX
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