TK15322 Просмотр технического описания (PDF) - Toko America Inc
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TK15322 Datasheet PDF : 12 Pages
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TK15322
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, and then Ach input
signal is outputted. The channel at TK15322M can be
changed by high level.
Key in
to Logic
1Ain
10 µF
VCC
33 µF
10 µF
+
RL
10 µF
1Bin
1Key
11
10
9
8
7
2Key
2Ain
10 µF
10 µF
RL
10 µF
2 Bin
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 12
Figure 13
CROSS TALK (ISOLATION AND SEPARATION)
Figure 14 is an example of a layout pattern. In the
application of the TK15322M, 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.).
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 TK15322M. For characteristics of
distortion and dynamic range versus R , refer to the graphs
L
in the Typical Performance Characteristics. The TK15322M
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 TK15322M. Input of the
TK15322M is the open base type.
1BIN
1OUT
1AIN
VCC
1KEY
GND
2BIN
2KEY
2OUT
2AIN
Figure 14
Page 10
June 1999 TOKO, Inc.
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