TK15327 데이터 시트보기 (PDF) - Toko America Inc
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TK15327 Datasheet PDF : 12 Pages
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TK15327
APPLICATION INFORMATION
KEY INPUT CIRCUIT
1ch and 2ch is separate action by each control keys. Figure
11 is an equivalence circuit of key input. If two keys are low
level or high level at the same time then the output is floating
condition. (See Terminal DC Voltage and Circuit table on
page 9).
Key in
to Logic
1Ain
33 µF
2Ain
10 µF
+
10 µF
+
+
10 µF
RL
1Bin
1Key
11
10
9
8
7
2Key
10 µF
10 µF
10 µF
RL
2 Bin
Figure 11
Figure 13
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%
t
Ach (Bch)
Bch (Ach)
SW out
CROSS TALK (ISOLATION AND SEPARATION)
Figure 14 is an example of a layout pattern. In the
application of the TK15327M, 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 12
Figure 13 illustrates an example of a typical application.
The standard application is to use capacitor coupling at the
inputs and output of the TK15327M. For characteristics of
distortion and dynamic range versus RL, refer to the graphs
in the Typical Performance Characteristics. The TK15327M
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 TK15329M. Input of the
TK15329M 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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