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TK15210 Datasheet(PDF) 9 Page - TOKO, Inc |
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TK15210 Datasheet(HTML) 9 Page - TOKO, Inc |
9 / 12 page January 2000 TOKO, Inc. Page 9 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. 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. 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 L, refer to the graphs 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. CROSS TALK 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.). Key in to Logic 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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