tda8295 NXP Semiconductors, tda8295 Datasheet - Page 34

• Manufacturer Part Number: tda8295
• Description: Tda8295 Digital Global Standard Low If Demodulator For Analog Tv And Fm Radio
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8295_1
Product data sheet
9.3.10 V-sync adjustment
Table 32.
Legend: * = default value.
Table 33.
Legend: * = default value.
Bit
7 to 3 -
2 to 0 T_IF_AGC_FS[2:0]
Bit
7 and 6 VS_WIDTH[1:0] R/W
5
4 to 0
Symbol
Symbol
VS_POL
VS_DEL[4:0]
T_IF_AGC_FS register (address 18h) bit description
V_SYNC_DEL register (address 1Ch) bit description
Digital global standard low IF demodulator for analog TV and FM radio
Rev. 01 — 4 February 2008
Access Value
R/W
R/W
Access Value
R/W
R/W
00
01*
10
11
0
1*
0Fh*
-
000
010*
100
Description
VS_WIDTH determines the width (in horizontal
lines) of the V-sync gating pulse (needed for gating
of tuner RF AGC2)
VS_POL determines the polarity of the V-sync
pulse: if VS_POL = 1, the first edge of the pulse is
positive, else negative.
VS_DEL determines the first edge position of the
output V-sync pulse compared to the beginning of
the vertical blanking interval:
pulse_position
Description
not used
by increasing the IF AGC noise shaper sampling
rate (f
(line clamping noise) can be heavily reduced
width 1 line (64 s)
width 2 lines
width 4 lines
width 16 lines
first edge negative
first edge positive
first edge 3 lines after beginning of vertical
interval
f
f
f
s
s
s
= 13.5 MHz
= 27 MHz
= 54 MHz
s
), the noise shaper in-band disturbance
=
VS_DEL 12
–
TDA8295
© NXP B.V. 2008. All rights reserved.
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