TDA8296 Datasheet, PDF (30/87 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 22. FILTERS_2 register (address 10h) bit description
Legend: * = default value.
Bit
Symbol
Access Value Description
7 and 6 -
R/W 00* not used
5
VID_FILT_ R/W
video filter characteristic adjust
LOW_RIP
0
smooth roll-off
1*
low ripple
4
-
R/W 1*
reserved, must be set to logic 1
3 to 0 SBP[3:0] R/W
The SSIF band-pass attenuates unwanted video
frequencies^[1][2], e.g. color carrier. For FM radio standard
it provides almost channel selectivity (see Figure 12).
0001* SSIF band-pass, wide bandwidth
0010
SSIF band-pass, normal bandwidth (1.1 MHz, all
TV standards)
0100
SSIF band-pass, narrow bandwidth (200 kHz,
FM radio)
[1] SSIF band-pass center frequency is controlled by DTO_SC[23:0]. See Table 20 for recommended DTO
values.
[2] Deviating from easy programming values for FILTERS_2, the narrow SSIF band-pass filter
(SPB[3:0] = 0100) should be used for M/N standard.
2
amplitude
response
(dB)
-2
001aan681
(1) (2)
(3) (4)
-6
-10
0
2
4
6
frequency (MHz)
(1) 4 MHz video filter in smooth roll off mode
(2) 4 MHz video filter in low ripple mode
(3) 5 MHz video filter in smooth roll off mode
(4) 5 MHz video filter in low ripple mode
Fig 11. Video low pass frequency response in smooth roll off or low ripple mode
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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