HSP50415 데이터 시트보기 (PDF) - Renesas Electronics

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HSP50415

Wideband Programmable Modulator (WPM)

Renesas Electronics 

HSP50415

NCO divider<13:0>

REFCLK divider<7:0>

REFCLK

8-BIT

COUNTER

14-BIT

COUNTER

carryOut

SYMBOL NCO

TC

14-bit countValue 8 upper bits of phaseAccum

CLK

SYNC enable

R

R

frequencyGain

freqError<15:0>

lagGain

phaseError<21:0>

FIGURE 2. PHASE/FREQUENCY ERROR DETECTOR

UL<31:0>

LL<13:0>

41

/

LIMITER

R

R

FIFOFreqError<8*7,7:0>

freqError<15:0>

_

phaseError<21:0>

DPLL

PhincError<31:0>

leadGain

FIGURE 3. DPLL LOOP FILTER

positive lockedValue

negative notLockedValue

threshold<20:0>

phaseErrorMag<20:0>

analogPLLlockStatus

useAPLLlockStatus

lockIntegrator<8>

LOCKDET

_

carryOut

AO

Z

A1

S

AO

A1 Z

S

R

lockIntegrator<8:0>

bit=1 indicates phaseErr > thld so NOT

locked

FIGURE 4. LOCK DETECTION BLOCK DIAGRAM

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.

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

FN4559 Rev 6.00

Apr 23, 2007

Page 8 of 29

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