TDA18211HD datasheet(39/66 Pages) NXP

39 / 66 page

TDA18211HD_5

Product data sheet

Rev. 05 — 2 June 2009

39 of 66

NXP Semiconductors

TDA18211HD

DVB-T Silicon Tuner IC

9.4.13 Flowchart TDA18211CalcMAINPLL

MPD, MD1, MD2 and MD3 are 8-bit registers. Arithmetical and logical operations

performed on those registers are considered binary operations. (Dividing is right shifting

and multiplying is left shifting, etc.)

Table 36.

TDA18211CalcMAINPLL

Function

Description

Reference

Description

ﬁnd the correct values for the bytes

MPD, MD1, MD2, MD3 and update the

tuner registers

Input

freq_input, MS

Table

MAIN_PLL_map

Table 45 “MAIN_PLL_map”

Output

Fig 18. Flowchart TDA18211CalcMAINPLL

001aag948

Tuner registers update

Internal table

I2C-bus

Start TDA18211CalcMAINPLL

End TDA18211CalcMAINPLL

Div

MAIN_DIV

MAIN_POST_DIV

freq_input

MAIN_PLL_map

freq_input

MAIN_POST_DIV

Div

MAIN_DIV

MD1 = (MAIN_DIV / 216) && 7Fh

MD2 = (MAIN_DIV / 28)

MD3 = MAIN_DIV

MPD … MD3

MPD = MAIN_POST_DIV && 7Fh

Find MAIN_POST_DIV, Div = fLO(max) in MAIN_PLL_map

Update MPD byte

MAIN_DIV = (Div

× freq_input × 27) / 125d

Update MD1, MD2, MD3 bytes

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