TDA8295_09 Datasheet, PDF (35/83 Pages) NXP Semiconductors – Digital global standard low IF demodulator for analog TV and FM radio

NXP Semiconductors
TDA8295
Digital global standard low IF demodulator for analog TV and FM radio
Table 32. T_IF_AGC_FS register (address 18h) bit description
Legend: * = default value.
Bit Symbol
Access Value Description
7 to 3 -
R/W -
not used
2 to 0 T_IF_AGC_FS[2:0] R/W
by increasing the IF AGC noise shaper sampling
rate (f_s), the noise shaper in-band disturbance
(line clamping noise) can be heavily reduced
000
010*
100
f_s = 13.5 MHz
f_s = 27 MHz
f_s = 54 MHz
9.3.10 V-sync adjustment
Table 33. V_SYNC_DEL register (address 1Ch) bit description
Legend: * = default value.
Bit
Symbol
Access Value Description
7 and 6 VS_WIDTH[1:0] R/W
VS_WIDTH determines the width (in horizontal
lines) of the V-sync gating pulse (needed for gating
of tuner RF AGC2)
00
width 1 line (64 μs)
01*
width 2 lines
10
width 4 lines
11
width 16 lines
5
VS_POL
R/W
VS_POL determines the polarity of the V-sync
pulse: if VS_POL = 1, the first edge of the pulse is
positive, else negative.
0
first edge negative
1*
first edge positive
4 to 0 VS_DEL[4:0] R/W
VS_DEL determines the first edge position of the
output V-sync pulse compared to the beginning of
the vertical blanking interval:
pulse_position = (VS_DEL – 12) lines
0Fh*
first edge 3 lines after beginning of vertical
interval
TDA8295_C2_2
Product data sheet
Rev. 02 — 27 November 2009
© NXP B.V. 2009. All rights reserved.
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