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TK15220 Datasheet(PDF) 9 Page - TOKO, Inc |
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TK15220 Datasheet(HTML) 9 Page - TOKO, Inc |
9 / 12 page June 1999 TOKO, Inc. Page 9 TK15220 APPLICATION INFORMATION KEY INPUT CIRCUIT Figure 10 illustates the KEY input equivalent circuit. When the control pin is open, the input is pulled down to a low level. This applies the channel A input signal to the output. A high level changes the output to the channel B input signal. The input impedance is approximately 40 k Ω. If it is desired to raise the key threshold level, an external series resistor can be connected. This resistance will elevate the threshold level. SWITCHING TIME This time is the signal change response time compared to the control key input signal. Figure 11 illustrates the timimg chart. T = 2 µs typically. 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 TK15220M. For characteristics of distortion and dynamic range versus R L, refer to the graphs in the Typical Performance Characteristics. The TK15220M 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 TK15220M. Use caution that the external channel is of the low level type. CROSS TALK Figure 13 is an example of a layout pattern. In the application of the TK15220, the following must be consid- ered. 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.). Key in to Logic ZIN Figure 10 Key in Bch (Ach) SW out 50% Ach (Bch) t Figure 11 VCC + + 33 µF Key + + inA 10 µF 10 µF out RL 10 µF inB Figure 12 Figure 13 |
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