PNX3000 Просмотр технического описания (PDF) - Philips Electronics
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PNX3000 Datasheet PDF : 51 Pages
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Philips Semiconductors
Analog front end for digital video
processors
Preliminary specification
PNX3000
Table 19 IF AGC operation mode
IFGT
0
1
MODE
non gated operation
gated operation; note 1
Note
1. Gated operation improves weak signal performance.
Gated operation is automatically disabled if CVBS_IF
is not selected as primary or secondary video signal.
In this situation bit IFLH should be set to 1 to avoid
recalibration of the IF VCO for white video patterns.
Table 20 CVBS IF output signal amplitude correction for
system I
MODE
VAI
PMOD = 0
PMOD = 1
0 no correction
no correction
1 amplitude +8 %
amplitude −8 %
Table 21 IF PLL offset adjustment
IFO5 TO IFO0
(HEX)
00
20
3F
CONTROL
tbf
no correction
tbf
Table 22 CVBS IF output signal amplitude
VA1 VA0
OUTPUT SIGNAL AMPLITUDE
PMOD = 0
PMOD = 1
0
0 no correction
no correction
0
1 spare
spare
1
0 amplitude −5 % amplitude +5 %
1
1 amplitude +5 % amplitude −5 %
Table 23 IF AGC tuner take over
TTO5 TO TTO0
(HEX)
CONTROL
3F
tuner take over at IF input signal of
0.4 mV
00
tuner take over at IF input signal of
80 mV
Table 24 External reference frequency
FXT
0 13.5 MHz
1 27 MHz
CONDITION
Table 25 PLL demodulator frequency setting
IFA IFB IFC
IF FREQUENCY
0
0
0 58.75 MHz
0
0
1 45.75 MHz
0
1
0 38.90 MHz
0
1
1 38.00 MHz
1
0
0 33.40 MHz
1
1
0 33.90 MHz
Table 26 IF VCO synthesizer frequency (SF7 to SF0);
note 1
SF7 TO SF0
(DECIMAL
NUMBER)
95
255
FREQUENCY
f = 24 MHz
f = 64 MHz
Note
1. fsynth = (N + 1) × 250 kHz; where 95 ≤ N ≤ 255.
Table 27 Bypass UV anti-alias filters
BPUV
MODE
0 normal operation
1 UV anti-alias filters bypass
Table 28 Bypass Yyuv anti-alias filter
BPY
MODE
0 normal operation
1 Yyuv anti-alias filter bypass
Table 29 Bypass anti-alias filters of primary CVBS
BPP
0
1
MODE
normal operation
primary CVBS anti-alias filters bypass
2004 Oct 04
17
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