CXA1946 SONY [Sony Corporation], CXA1946 Datasheet - Page 19

• Manufacturer Part Number: CXA1946
• Description: Electronic Volume
• Manufacturer: SONY [Sony Corporation]

4. Tone control
input impedance
The configuration of the tone control circuit is shown in Fig. 4. C
externally, and the tone control frequency characteristics can be changed by changing these constants.
The relationships between C
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
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
these methods are used, variations in the absolute value of the CXA1946A 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 CXA1946A have no effect on the tone control
characteristics.
The input impedance is 19kΩ (typ.) for TIN1 and TIN2.
The output impedance for TCO1 and TCO2 is low impedance (roughly 0Ω). The tone step width and gain
are not affected by the load impedance.
19k
1/f
1/f
TINX
L
H
12k
Tone control frequency
= 2πC
= 2πC
f
characteristics
L
TCLCX2
TCHCX
TCLCX1
R
(R
f
5
H
3
//R
4
R4
8k
TCLCX2
)
10k
10k
TCHCX
10k
/C
TCLCX2
R3
8k
TCHCX
C
0.39µ
TCLCX2
R5
5k
0.0027µ
C
TCHCX
Fig. 4. Tone Control
10k
and the frequency characteristics are as follows:
TREBLE
BASS
– 19 –
OFF
OFF
ON
ON
OFF
OFF
ON
ON
TCHCX
CUT
BOOST
CUT
BOOST
in series. (See Fig. 6.) However, when
14.1k
TCLCX2
and C
14.1k
14.1k
14.1k
TCHCX
12k
are connected
CXA1946AQ/AR
TCLCX2
TCOX
in