Motorola MC68HC908MR32 사용자 설명서

Electrical Specifications

CGM Acquisition/Lock Time Specifications

MC68HC908MR16/MC68HC908MR32 — Rev. 4.0

Advance Information

 

MOTOROLA

Electrical Specifications

 377

Filter capacitor multiply factor

C

FACT

—

0.0154

—

F/sV

Acquisition mode time factor

K

ACQ

—

0.1135

—

V

Tracking mode time factor

K

TRK

—

0.0174

—

V

Manual mode time to stable

t

ACQ

—

(8*V

DDA

)/

(f

XCLK

*K

ACQ)

—

If C

F

 chosen 

correctly

Manual stable to lock time 

t

AL

—

(4*V

DDA

)/

(f

XCLK

*K

TRK

)

—

If C

F

 chosen 

correctly

Manual acquisition time

t

Lock

—

t

ACQ

+t

AL

—

Tracking mode entry frequency 

tolerance

∆

TRK

0

—

±

3.6%

Acquisition mode entry frequency 

tolerance

∆

ACQ

±

6.3%

—

±

7.2%

Lock entry frequency tolerance

∆

Lock

0

—

±

0.9%

Lock exit frequency tolerance

∆

UNL

±

0.9%

—

±

1.8%

Reference cycles per acquisition 

mode measurement

n

ACQ

—

32

—

Reference cycles per tracking 

mode measurement

n

TRK

—

128

—

Automatic mode time to stable

t

ACQ

n

ACQ

/f

XCLK

(8*V

DDA

)/

(f

XCLK

*K

ACQ)

—

If C

F

 chosen 

correctly

Automatic stable to lock time

t

AL

n

TRK

/f

XCLK

(4*V

DDA

)/

(f

XCLK

*K

TRK

)

—

If C

F

 chosen 

correctly

Automatic lock time

t

Lock

—

t

ACQ

+t

AL

—

PLL jitter (deviation of average bus 

frequency over 2 ms)

f

J

0

—

± 

(f

XCLK

)

*(0.025%)

*(N/4)

N = VCO

freq. mult.