TLC2932IPWR datasheet(18/24 Pages) TI

部件名	TLC2932IPWR

功能描述	HIGH-PERFORMANCE PHASE-LOCKED LOOP

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制造商	TI [Texas Instruments]

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TLC2932

HIGH-PERFORMANCE PHASE-LOCKED LOOP

SLAS097E – SEPTEMBER 1994 – REVISED MAY 1997

18

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

Using the low-pass filter in Figure 25(b) and divider ratio N, the transfer function for phase and frequency are

shown in equations 1 and 2. Note that the transfer function for phase differs from the transfer function for

frequency by only the divider value N. The difference arises from the fact that the feedback for phase is unity

while the feedback for frequency is 1/N.

Hence, transfer function of Figure 24 (a) for phase is

F2(s)

F1(s) +

Kp

@ KV

N

@ (T1 ) T2)

1

) s

@ T2

s2

) s 1 )

Kp

@KV @T2

N

@(T1)T2)

)

Kp

@K

V

N

@(T1)T2)

(1)

and the transfer function for frequency is

F

OUT(s)

F

REF(s)

+

Kp

@ KV

(T1

) T2)

1

) s

@ T2

s2

) s

@ 1 )

Kp

@K

V

@T2

N

@(T1)T2)

)

Kp

@KV

N

@(T1)T2)

(2)

The standard two-pole denominator is D = s2 + 2

ζ ωn s + ωn2 and comparing the coefficients of the denominator

of equation 1 and 2 with the standard two-pole denominator gives the following results.

wn +

Kp

@ KV

N

@ (T1 ) T2)

Solving for T1 + T2

T1

) T2 +

Kp

@ KV

N

@ w 2

n

(3)

and by using this value for T1 + T2 in equation 3 the damping factor is

z +

wn

2 @

T2

)

N

Kp

@ K

V

solving for T2

T2

+

2

z

w –

N

Kp

@ K

V

then by substituting for T2 in equation 3

T1

+

K

V

@ Kp

N

@ w 2

n

–

2

z

w

n

)

N

Kp

@ K

V

类似零件编号 - TLC2932IPWR

制造商	部件名	数据表	功能描述
Texas Instruments	TLC2932IPWR	811Kb / 29P	[Old version datasheet] HIGH-PERFORMANCE PHASE-LOCKED LOOP
Texas Instruments	TLC2932IPWRG4	811Kb / 29P	[Old version datasheet] HIGH-PERFORMANCE PHASE-LOCKED LOOP

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