TK15323 查看數據表（PDF） - Toko America Inc
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TK15323 Datasheet PDF : 12 Pages
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TK15323
APPLICATION INFORMATION
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 µA 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.
1Ain
VCC 33 µF
10 µF
+
RL
1Bin
1Key
11
10
9
8
7
2Key
2Ain
10 µF
RL
2 Bin
Key in
i
to Logic
Figure 13
CROSS TALK (ISOLATION AND SEPARATION)
Figure 11
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 µs typically.
Key in
50%
Bch (Ach)
SW out
t
Ach (Bch)
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.
2AIN
VCC
GND
2BIN
Figure 12
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 RL, refer to the graphs
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 /2 V.
CC
Page 10
1OUT
1AIN
2OUT
1KEY
2KEY
Figure 14
1BIN
June 1999 TOKO, Inc.
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