TDA8295_09 Datasheet, PDF(42/83 Page) NXP Semiconductors – Digital global standard low IF demodulator for analog TV and FM radio

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TDA8295_09 Datasheet, PDF (42/83 Pages) NXP Semiconductors – Digital global standard low IF demodulator for analog TV and FM radio

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NXP Semiconductors

TDA8295

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

Table 44. HVPLL_STAT register (address 26h) bit description

Bit

Symbol

Access Value Description

7 and 6 -

not used

NOISE_DET R

This flag gets HIGH in case the video S/N (weighted)

drops below 30 dB. For proper and noise free video

signals it stays LOW. It can be used for debugging and

other purposes.

MAC_DET R

This flag indicates the presence of copy-guarded video

content from STBs or VCRs. It can be used for

debugging and other purposes.

FIDT

This flag indicates the frame rate (50 Hz or 60 Hz).

When active, 60 Hz is detected. It can be used for

debugging and other purposes.

V_LOCK R

This flag is active, if a proper frame (50 Hz or 60 Hz) is

detected. It can be used for debugging and other

purposes.

F_H_LOCK R

This flag is active, if a proper H-sync (15.625 kHz or

15.734 kHz) is detected (Fast mode). It can be used for

debugging and other purposes.

N_H_LOCK R

This flag is active, if a proper H-sync (15.625 kHz or

15.734 kHz) is detected (Normal mode). It can be used

for debugging and other purposes.

Table 45. D_IF_AGC_STAT register (address 27h) bit description

Bit Symbol

Access Value Description

7 to 0 D_IF_AGC_STAT[7:0] R

D_IF_AGC_STAT is the digital IF AGC status

readout byte. Contains the digital IF AGC loop

DC information. The format is twos

complement. To get the internal gain in dB, the

following formula can be used:

gain

D-----_---I--F----_---A---G-----C----_---S---T---A----T----+-----5---0--

3.675

(dB)

Table 46. T_IF_AGC_STAT register (address 28h) bit description

Bit Symbol

Access Value Description

7 to 0 T_IF_AGC_STAT[7:0] R

T_IF_AGC_STAT is the IF AGC status readout

byte. Contains the tuner IF AGC loop DC

information. The format is offset binary.

TDA8295_C2_2

Product data sheet

Rev. 02 â 27 November 2009

42 of 83

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