TK15323MTL/323 TOKO [TOKO, Inc], TK15323MTL/323 Datasheet - Page 10

• Manufacturer Part Number: TK15323MTL/323
• Description: Audio Analog Switch
• Manufacturer: TOKO [TOKO, Inc]

TK15323
KEY INPUT CIRCUIT
1ch and 2ch is separate action by each control keys. Figure
11 is an equivalence circuit of key input. When terminal of
key is the open, is outputting high level (about 1.4 V), and
then Ach input signal is outputted. The channel at TK15323M
can be changed by low level. When a control terminal was
operated to low function, sometimes it may flow out
maximum values about 30 A as current from the terminal.
For this reason, please use a resistance which does not
exceed 0.8 V when attaching a resistance to the outside
and making a low condition.
SWITCHING TIME
This time is the signal change response time compared to
the control key input signal. Figure 12 illustrates the timimg
chart. T = 2 s typically.
APPLICATION
Figure 13 illustrates an example of a typical application.
The standard application is to use capacitor coupling at the
inputs and output of the TK15323M. For characteristics of
distortion and dynamic range versus R
in the Typical Performance Characteristics. The TK15323M
can be used at the capacitor coupling too, but then the bias
supply is necessary from outside. If capacitor coupling is
desired, then it is recommended to use a built-in bias type.
Input of the TK15323M is the open base type. DC input bias
voltage of the TK15323M is V
Page 10
Key in
Ach (Bch)
i
50%
Key in
Figure 11
Figure 12
t
CC
/2 V.
Bch (Ach)
SW out
to Logic
APPLICATION INFORMATION
L
, refer to the graphs
CROSS TALK (ISOLATION AND SEPARATION)
Figure 14 is an example of a layout pattern. As the
TK15323M is a direct coupling type, the influence by
applications is not almost. But, if it is coupled at the
capacitor, by high impedance at input, capacitors
acccomplishes the antenna action each other. Then in
case its parts are bigger, and the space between capacitors
is too narrow, cross talk will increase. Therefore, when
designing the print circuit pattern, separate the input
capacitors as far as possible and use smaller parts.
1OUT
2AIN
1AIN
R L
10 µF
1Ain
+
1Bin
V CC
1KEY
V CC
1Key
Figure 13
Figure 14
+
33 µF
2Key
11
10
9
8
7
June 1999 TOKO, Inc.
2KEY
GND
2 Bin
2Ain
+
10 µF
R L
2OUT
2BIN
1BIN