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SP8853 Datasheet(PDF) 6 Page - Mitel Networks Corporation |
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SP8853 Datasheet(HTML) 6 Page - Mitel Networks Corporation |
6 / 14 page 6 SP8853A/B An F1 or F2 update cycle will consist of a byte containing 24 bits whereas the reference byte will contain 18 bits. The device requires 3 bytes, each with a chip select sequence, totalling 66 bits to fully program. When the dual modulus A counter is set to 48/9, the data required to set the counter is reduced by one bit, leaving an unused bit in the 22-bit F1/F2 buffer. This bit must always be set to zero when the 48/9 mode is required. Various programming sequences are shown in Fig. 7. The data entry and storage registers are always powered up, making it possible to enter data when the device is in the powered down state. PD2 PD2 Result 0 1 0 1 0 0 1 1 FREF and FPD outputs off, charge pumps 1 and 2 on FREF and FPD outputs on, charge pump 1 off, charge pump 2 on FREF and FPD outputs off, charge pump 1 disabled by lock detect, charge pump 2 on FREF and FPD outputs on, charge pump 1 disabled by lock detect, charge pump 2 on Table 4 Fig. 6 Application diagrams 1 5V CONTROL MICRO 432 1 28 27 26 12 13 14 15 16 17 18 5 6 7 8 9 10 11 25 24 23 22 21 20 19 SP8853 1n 33p 39p FREF FPD 1 5V 1n 0·1 µ 1 5V SL562 − + C1 C2 R2 Rx Rx LOOP FILTER VOLTAGE CONTROLLED OSCILLATOR 1n VCC 2 1 5V Rb RPD 1 5V 2·2k Rb > 0·25 PD2 current Fig. 6a Typical application 128 27 26 25 24 SP8853 Cd VCC Ra Ra 2 3 TO LOOP AMPLIFIER Fig. 6c Use of lock detect circuit with PD1 Fig. 6b Connection of external reference EXTERNAL REFERENCE SOURCE NC 21 20 19 1 5V 22k 470 TO VCO VARICAP SUPPLY 10k LOOP FILTER FROM CHARGE PUMP Fig. 6d Simple discrete amplifier Ra > 23 0·25 PD2 current VCC |
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Similar Description - SP8853 |
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