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MT88L70ANR Datasheet(PDF) 4 Page - Zarlink Semiconductor Inc |
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MT88L70ANR Datasheet(HTML) 4 Page - Zarlink Semiconductor Inc |
4 / 16 page MT88L70 Data Sheet 4 Zarlink Semiconductor Inc. the steering time constants externally, allows the designer to tailor performance to meet a wide variety of system requirements. Table 1 - Functional Decode Table L=LOGIC LOW, H=LOGIC HIGH, Z=HIGH IMPEDANCE X = DON‘T CARE Guard Time Adjustment In many situations not requiring selection of tone duration and interdigital pause, the simple steering circuit shown in Figure 3 is applicable. Component values are chosen according to the formula: tREC=tDP+tGTP tID=tDA+tGTA The value of tDP is a device parameter (see Figure 7) and tREC is the minimum signal duration to be recognized by the receiver. A value for C of 0.1 µF is recommended for most applications, leaving R to be selected by the designer. Digit TOE INH ESt Q4 Q3 Q2 Q1 ANY L X H ZZZZ 1 H X H 0001 2 H X H 0010 3 H X H 0011 4 H X H 0100 5 H X H 0101 6 H X H 0110 7 H X H 0111 8 H X H 1000 9 H X H 1001 0 H X H 1010 * H X H 1011 # H X H 1100 A H L H 1101 B H L H 1110 C H L H 1111 D H L H 0000 AH H L undetected, the output code will remain the same as the previous detected code BH H L CH H L DH H L |
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