MSP3410D datasheet(30/83 Pages) MICRONAS

30 / 83 page

MSP 34x0D

PRELIMINARY DATA SHEET

Micronas

6.5.4. DCO Registers

For a chosen TV standard, a corresponding set of

24-bit registers determining the mixing frequencies of

the quadrature mixers, has to be written into the IC. In

Table 6–12, some examples of DCO registers are

listed. It is necessary to divide them up into low part

and high part. The formula for the calculation of the

registers for any chosen IF frequency is as follows:

INCRdec = int(f / fs ⋅ 2

24)

with:

int

= integer function

= IF frequency in MHz

= sampling frequency (18.432 MHz)

Conversion of INCR into hex format and separation of

the 12-bit low and high parts lead to the required regis-

ter values (DCO1_HI or _LO for MSP Ch1, DCO2_HI

or LO for MSP Ch2).

Table 6–12: DCO registers for the MSP 34x0D (reset status: DCO_HI/LO = “0000”)

DCO1_LO 0093hex, DCO1_HI 009Bhex ; DCO2_LO 00A3hex, DCO2_HI 00ABhex

Freq. [MHz]

DCO_HIhex

DCO_LOhex

Freq. [MHz]

DCO_HIhex

DCO_LOhex

4.5

03E8

0000

5.04

5.5

5.58

5.7421875

0460

04C6

04D8

04FC

0000

038E

0000

00AA

5.76

5.85

5.94

0500

0514

0528

0000

6.0

6.2

6.5

6.552

0535

0561

05A4

05B0

0555

0C71

071C

0000

6.6

6.65

6.8

05BA

05C5

05E7

0AAA

0C71

01C7

7.02

0618

0000

7.2

0640

0000

7.38

0668

0000

7.56

0690

0000

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