tda8296 NXP Semiconductors, tda8296 Datasheet - Page 37

• Manufacturer Part Number: tda8296
• Description: Tda8296 Digital Global Standard Low If Demodulator For Analog Tv And Fm Radio
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 35.
Legend: * = default value.
TDA8296
Product data sheet
Bit
7
6
5
4
3
Symbol
-
SSIF_AGC_TC
SSIF_AGC_CTRL R/W
HD_DK
FOR_MUTE
SOUNDSET_2 register (address 21h) bit description
Table 34.
Legend: * = default value.
Bit
4 to 0
Access Value
R/W
R/W
R/W
R/W
Symbol
DEEMPH[4:0]
SOUNDSET_1 register (address 20h) bit description
0*
0*
1
0
1*
0*
1
X
0*
1
X
Digital global standard low IF demodulator for analog TV and FM radio
All information provided in this document is subject to legal disclaimers.
Description
reserved, must be set to logic 0
SSIF AGC time constant for L/L-accent standard
SSIF AGC control
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
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.
slow (normal)
fast
SSIF AGC off
SSIF AGC on
high Deviation mode off
high Deviation mode on
don’t care if SSIF output is chosen (SSIF_SND[1:0] = 10)
off
on
don’t care if SSIF output is chosen (SSIF_SND[1:0] = 10)
Rev. 1 — 3 March 2011
Access Value
R/W
0 0001*
0 0010
0 0100
0 1000
1 0000
Description
mono sound de-emphasis adjustment to
compensate transmitter pre-emphasis; or
low-pass filter to remove out of audio band
interferers
Table
de-emphasis of 75 μs for M/N standard or
non-European FM radio to compensate the
transmitter pre-emphasis
de-emphasis of 50 μs for B/G/H, D/K and
I standard or European FM radio to
compensate the transmitter pre-emphasis
low-pass filter with 30 kHz −3 dB cut-off
frequency to remove out of audio band
interferers
low-pass filter with 140 kHz −3 dB cut-off
frequency to drive an external BTSC stereo
decoder
The de-emphasis filter is bypassed. This
can be used for debugging or other
purposes.
36) is recommended.
…continued
TDA8296
© NXP B.V. 2011. All rights reserved.
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