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SP8853BHC Datasheet(PDF) 2 Page - Mitel Networks Corporation |
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SP8853BHC Datasheet(HTML) 2 Page - Mitel Networks Corporation |
2 / 14 page 2 SP8853A/B Fig. 2 SP8853 block diagram Fig. 3 Detailed block diagram of lock detect circuit fPD 11 15 BIT M COUNT 1 LOGIC 4 BIT A COUNT 1 LOGIC 2 BIT 1 BIT DUAL F1/F2 DATA BUFFER N0 N3 N4 N18 N19 N20 N21 22 BIT SHIFT REGISTER 1 BIT 13 BIT 2 BIT N0 N12 N14 N15 N13 SINGLE REFERENCE BUFFER LOGIC 2-BIT SR DATA INPUT 16/17 OR 8/9 CONTROL fREF PHASE DETECTOR LOGIC R COUNT OUTPUT INTERFACE CHARGE PUMP 1 CHARGE PUMP 2 PD1 3 LOCK DETECT RF INPUT 10 F1/F2 DATA CLOCK ENABLE POWER DOWN 13 14 15 16 6 PD2 25 27 Cd 28 RPD 24 20 21 CRYSTAL FREF* 5 4 FPD* *FREF and FPD outputs are reversed by the phase detector sense bit in the F1/F2 programming word. The pin allocations shown are correct when the sense bit is low (see Table 2 and Fig. 7). RF INPUT REFERENCE DIVIDER − + VCC PHASE DETECTOR fPD fREF CHARGE PUMP 2 TRANSCONDUCTANCE AMPLIFIER 3 1 CHARGE PUMP 1 − + − + 3 1 3 1 BUFFER 10k 45k 45k DUAL VOLTAGE COMPARATOR PD1 3 CHARGE PUMP 1 DISABLE (SEE TABLE 4) RPD 24 PD2 25 Cd 28 LOCK DETECT 27 Output current at pin 27 is proportional to voltage difference between pins 25 and 28, IMAX = 625µA |
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