TK15210 Просмотр технического описания (PDF) - Toko America Inc
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TK15210 Datasheet PDF : 12 Pages
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TK15210
APPLICATION INFORMATION
KEY INPUT CIRCUIT
Figure 10 illustrates the KEY input equivalent circuit. When
the control pin is open, the input is pulled up to a high level
(approximately 1.4 V). This applies the channel A input
signal to the output. A low level changes the output to the
channel B input signal. When the control terminal is pulled
low, a current up to 30 µA may flow out of the terminal. For
this reason, an external resistor value must be selected
which results in a voltage of less than 0.8 V to maintain a low
condition.
Key in
to Logic
inA
10 µF
+
10 µF
out
+
RL
+
10 µF
inB
Figure 12
VCC
+
33 µF
Key
CROSS TALK
Figure 10
SWITCHING TIME
This time is the signal change response time compared to
the control key input signal. Figure 11 illustrates the timing
chart. T = 2 µs typically.
Key in
50%
Bch (Ach)
SW out
Figure 13 is an example of a layout pattern. In the
application of the TK15210M, 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.).
t
Ach (Bch)
Figure 11
APPLICATION
Figure 12 illustrates an example of a typical application.
The standard application is to use capacitor coupling at the
inputs and output of the TK15210M. For characteristics of
distortion and dynamic range versus R , refer to the graphs
L
in the Typical Performance Characteristics. The TK15210M
can also be used with direct coupling, but the characteristics
will get worse (distortion, etc.). If direct coupling is desired,
then it is recommended to use external circuitry that is
biased compatible with the TK15210M.
January 2000 TOKO, Inc.
Figure 13
Page 9
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