TDA8296 Datasheet, PDF (32/87 Pages) NXP Semiconductors – Digital global standard low IF demodulator for analog TV and FM radio

NXP Semiconductors
TDA8296
Digital global standard low IF demodulator for analog TV and FM radio
9.3.8 Digital IF AGC functions
Table 24. D_IF_AGC_SET_1 register (address 12h) bit description
Legend: * = default value.
Bit Symbol
Access Value Description
7
-
R/W 1*
reserved, must be set to logic 1
6
D_IF_AGC_MODE R/W
If HIGH, the digital IF AGC detection and gating is
done during the back porch of the video signal.
This Detection mode can be used for all
standards (also L/L-accent standard) without
impact on the IF AGC loop speed.
0*
peak sync AGC (slow peak white L/L-accent
standard)
1
black level AGC detection
5 to 0 -
R/W 10 0000* reserved, must be set to logic 10 0000
Table 25. D_IF_AGC_SET_2 register (address 13h) bit description
Legend: * = default value.
Bit Symbol
Access Value
Description
7
-
R/W 1*
reserved, must be set to logic 1
6 to 0 D_IF_AGC_BW[6:0] R/W
digital IF AGC 3 dB-loop bandwidth setting
000 0001 25 Hz
000 0010 50 Hz
000 0100 100 Hz
000 1000 200 Hz
001 0000* 400 Hz
010 0000 800 Hz
100 0000 1.6 kHz (not recommended)
9.3.9 Tuner IF AGC functions
Table 26. T_IF_AGC_SET register (address 15h) bit description
Legend: * = default value.
Bit Symbol
Access Value
Description
7
POL_TIF
R/W
tuner IF AGC polarity
0
inverted tuner IF AGC polarity
1*
normal tuner IF AGC polarity: the higher
the necessary gain, the higher the IF
AGC voltage
TDA8296
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 3 March 2011
© NXP B.V. 2011. All rights reserved.
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