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HSP50415VI Datasheet(PDF) 8 Page - Intersil Corporation |
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HSP50415VI Datasheet(HTML) 8 Page - Intersil Corporation |
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8 / 29 page  4-8 The Lock Detector compares the magnitude of the phaseError to a programmable 21-bit threshold value. If the carry out from this comparison is “1” then the phaseError is greater than or equal to the threshold value and a negative value is added to the lock integrator. If the carry out is “0” then the phaseError is less than the threshold and a positive value is added. As the phaseError magnitude stays below the threshold level the lock integrator will grow from a negative number to a positive one thus indicating a locked condition. The lock integrator resets to a full-scale negative value. The sign bit of the lock integrator is output as the LOCKDET status flag. The values added or subtracted to the lock integrator are user selectable as follows in Table 2. FIGURE 2. PHASE/FREQUENCY ERROR DETECTOR FIGURE 3. DPLL LOOP FILTER FIGURE 4. LOCK DETECTION BLOCK DIAGRAM REFCLK divider<7:0> NCO divider<13:0> carryOut 8 upper bits of phaseAccum 14-bit countValue enable freqError<15:0> phaseError<21:0> FIFOFreqError<8*7,7:0> 8-BIT SYNC R R SYMBOL NCO REFCLK CLK TC _ COUNTER 14-BIT COUNTER UL<31:0> LL<13:0> phaseError<21:0> freqError<15:0> frequencyGain lagGain leadGain LIMITER R R 41 / DPLL PhincError<31:0> phaseErrorMag<20:0> threshold<20:0> useAPLLlockStatus analogPLLlockStatus carryOut lockIntegrator<8:0> negative notLockedValue positive lockedValue bit=1 indicates phaseErr > thld so NOT locked lockIntegrator<8> LOCKDET A1 S AO Z R A1 S AO Z _ TABLE 2. LOCK INTEGRATOR ADDENDS LOCK FACTOR CARRY OUT ADDEND BINARY VALUE 0xx 1 -0.5 111111000 1xx 1 -0.25 111111100 x00 0 +0.0625 000000001 x01 0 +0.1250 000000010 x10 0 +0.2500 000000100 x11 0 +0.5000 000001000 HSP50415 |
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