TA8552AFN datasheet(10/16 Pages) TOSHIBA

Part #	TA8552AFN

Description	PLL Data Synchronizer For DAT Streamer

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Manufacturer	TOSHIBA [Toshiba Semiconductor]

Direct Link	http://www.semicon.toshiba.co.jp/eng

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10 / 16 page

TA8552AFN

2002-10-30

10

【

Calculation of ωn】

The capturing time of PLL is expected as above 11.5µs. Therefore (ωn) is deternimated as the following:

ωn = 6 / (11.5×10-6) = 552krad / s

【

Calculation of K0 (VCO control gain)】

K0 is determined as the following;

K0 = 40MHz / V = 251.3Mrad / V

【

Calculation of Kf (phase detector gain)】

Kf is estimated as the following (the current of charge pump is set as ±50µA.)

Kf =

2

1 ･

F

2

1 ×50×10-6 = 3.98×10-6(A / rad)

The current of charge pump (Ichp) is set by an external resister (Rcp1), connected with Rcp1 (26pin). When

"H"level voltage inputs to MODESEL (12pin), Ichp is set as the following:

Ichp = 2×1.3 / RCP1→RCP1 = 2×1.3 / Ichp = 2×1.3 / 50×10-6 = 52×103Ω

Therefore, when RCP1 is 52kΩ, Ichp is set as ±50µA

【

Calculation of external devices of loop-filter】

F

6

-

10

1800

2

)

3

10

(522

2

6

10

251.3

-6

10

3.98

n

2

0

K

L1

C

´

=

´

=

w

´

f

=

W

´

=

´

=

w

z

=

3

10

1.5

3

10

522

12

-

10

1800

0.7

2

n

L1

C

2

L

R

CL2 = CL1 / 10 = 180pF

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TA8552AFN Datasheet(PDF) 10 Page - Toshiba Semiconductor

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