CXA1946BQ Ver la hoja de datos (PDF) - Sony Semiconductor

Número de pieza

componentes Descripción

Fabricante

CXA1946BQ

Electronic Volume

Sony Semiconductor 

CXA1946BQ/BR

4. Tone control

The configuration of the tone control circuit is shown in Fig. 4. CTCLCX2 and CTCHCX are connected

externally, and the tone control frequency characteristics can be changed by changing these constants.

The relationships between CTCLCX2/CTCHCX and the frequency characteristics are as follows:

1/fL = 2πCTCLCX2 (R3//R4)

1/fH = 2πCTCHCXR5

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 CTCLCX2 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 CTCHCX 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 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.

12k

TINX

input impedance

19kΩ

TCLCX1

CTCLCX2

0.39µ

TCLCX2

R4

8k

R3

8k

BASS

ON

OFF

14.1k

CUT

ON

OFF BOOST

14.1k

12k

14.1k

10k

10k

10k

fL

fH

Tone control frequency

characteristics

10k

R5

5k

TCHCX

TREBLE

CTCHCX

0.0027µ

ON

OFF

CUT

ON

OFF BOOST

14.1k

TCOX

Fig. 4. Tone Control

– 19 –

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