TK15321 데이터 시트보기 (PDF) - Toko America Inc
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TK15321 Datasheet PDF : 12 Pages
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TK15321
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 TK15321M
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
33 µF
2Ain
10 µF
+
10 µF
+
+
10 µF
RL
1Bin
1Key
10 µF
11
10 µF
10
9
8
10 µF
RL
7
2Key
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. In the
application of the TK15321M, the following must be
considered. Because of the high impedance at the inputs,
the capacitors can act as antennas to each other. If the
parts are bigger, and the space between the capacitors is
too narrow, then cross talk will increase. Therefore, when
designing the printed circuit pattern, separate the input
capacitors as far as possible and use as small a part as
possible (e.g., surface mount types, etc.).
1BIN
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 TK15321M. For characteristics of
distortion and dynamic range versus RL, refer to the graphs
in the Typical Performance Characteristics. The TK15321M
can also be used with direct coupling, but the characteris-
tics will get worse (distortion, etc.). If direct coupling is
desired, then it is recommended to use external circuitry
that is biased compatible with the TK15321M. Input of the
TK15321M is the open base type.
1OUT
1AIN
Page 10
2OUT
1KEY
2KEY
Figure 14
2AIN
May 1999 TOKO, Inc.
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