TDA8296 datasheet(28/87 Pages) NXP

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TDA8296

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Product data sheet

Rev. 1 — 3 March 2011

28 of 87

NXP Semiconductors

TDA8296

Digital global standard low IF demodulator for analog TV and FM radio

9.3.6 Filter settings

Fig 8.

TDA8296 DTO_SC characteristic

DTO reg val (dec) (1E6)

001aam354

Fsc

[MHz]

Table 20.

Values for SSIF mode at 54 MHz sampling frequency

Standard

DTO_SC[23:16]

DTO_SC[15:8]

DTO_SC[7:0]

Band-pass center frequency

M/N

55h

00h

4.5 MHz

6Dh

09h

00h

5.75 MHz

G/H

6Dh

09h

00h

5.75 MHz

76h

84h

00h

6.25 MHz

D/K

76h

84h

00h

6.25 MHz

L/L-accent

72h

B9h

00h

6.05 MHz

FM radio

68h

4Bh

00h

5.5 MHz

Table 21.

FILTERS_1 register (address 0Fh) bit description

Legend: * = default value.

Bit

Symbol

Access

Value

Description

7 to 5

VID_FILT[2:0]

R/W

video low-pass filter to remove all unwanted frequencies

(own sound carriers) above video content (see Figure 9)

001*

video low-pass filter 4 MHz

010

video low-pass filter 5 MHz

100

video low-pass filter off

4 to 0

NOTCH_FILT[4:0]

R/W

The notch filter attenuates the adjacent sound carrier N

− 1,

which is located differently dependent on standard

(see Figure 10).

0 0001*

notch filter at 6.9 MHz for M/N standard

0 0010

notch filter at 7.9 MHz for B standard

0 0100

notch filter at 8.3 MHz for D/K and L standard

0 1000

notch filter at 9.25 MHz for G/H, I and L-accent standard

1 0000

notch filter bypass

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