TDA8296 Datasheet, PDF (37/87 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
Table 34. SOUNDSET_1 register (address 20h) bit description …continued
Legend: * = default value.
Bit
Symbol
Access Value Description
4 to 0 DEEMPH[4:0]
R/W
mono sound de-emphasis adjustment to
compensate transmitter pre-emphasis; or
low-pass filter to remove out of audio band
interferers
0 0001*
de-emphasis of 75 μs for M/N standard or
non-European FM radio to compensate the
transmitter pre-emphasis
0 0010
de-emphasis of 50 μs for B/G/H, D/K and
I standard or European FM radio to
compensate the transmitter pre-emphasis
0 0100
low-pass filter with 30 kHz −3 dB cut-off
frequency to remove out of audio band
interferers
0 1000
low-pass filter with 140 kHz −3 dB cut-off
frequency to drive an external BTSC stereo
decoder
1 0000
The de-emphasis filter is bypassed. This
can be used for debugging or other
purposes.
Table 35. SOUNDSET_2 register (address 21h) bit description
Legend: * = default value.
Bit
Symbol
Access Value Description
7
-
R/W 0*
reserved, must be set to logic 0
6
SSIF_AGC_TC R/W
SSIF AGC time constant for L/L-accent standard
0*
slow (normal)
1
fast
5
SSIF_AGC_CTRL R/W
SSIF AGC control
0
SSIF AGC off
1*
SSIF AGC on
4
HD_DK
R/W
When active, the internal FM mono sound demodulator can handle
excessive FM deviations up to 400 kHz. This might happen in D/K standard
China. To activate this mode, it is mandatory to set D/K standard first. The
sound output level has to be adapted accordingly by the microprocessor to
avoid sound DAC clipping. E.g. for 400 kHz FM deviation, the −12 dB setting
of the sound level register (see Table 36) is recommended.
0*
high Deviation mode off
1
high Deviation mode on
X
don’t care if SSIF output is chosen (SSIF_SND[1:0] = 10)
3
FOR_MUTE
R/W
When active, the mono sound signal is always muted. This setting only
makes sense in case the sound DAC output is also set to mono sound
(SSIF_SND[1:0] = 01). FOR_MUTE has no function if SSIF_SND[1:0] = 10.
0*
off
1
on
X
don’t care if SSIF output is chosen (SSIF_SND[1:0] = 10)
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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