參數(shù)資料
型號(hào)： PNX3000N3
廠商： NXP Semiconductors N.V.
英文描述： Analog front end for digital video processors
中文描述： 模擬前端數(shù)字視頻處理器
文件頁(yè)數(shù)： 37/51頁(yè)
文件大?。?/td> 285K
代理商： PNX3000N3
2004 Oct 04
37
Philips Semiconductors
Preliminary specification
Analog front end for digital video
processors
PNX3000
depends on the value of the decoupling capacitor C
dec
on the emitter of the external transistor. Recommended value
I
o
V
o
is
μ
F, with I
o
in mA.
3.
This parameter is not tested during production and is just given as application information for the designer of the
television receiver.
Loop bandwidth B
L
= 60 kHz (natural f
N
= 15 kHz; damping factor d = 2; calculated with top sync level as IF PLL
input signal level).
The IF PLL demodulator uses an internal VCO (no external LC-circuit required) which is calibrated by means of a
digital control circuit which uses the clock frequency of the microcontroller/teletext decoder as a reference. The
required IF frequency for the various standards is set via the I
2
C-bus. When the system is locked the resulting
IF frequency is very accurate with a deviation from the nominal value of less than 25 kHz.
Measured at pin CVBSOUTIF with 10 mV (RMS) top sync input signal at VIF input.
So called projected zero point, i.e. with switched demodulator.
The signal amplitude at the CVBSOUTIF output depends on the setting of bits VA1 and VA0. The recommended
settings for negative modulation (bit PMOD = 0) is VA1 = VA0 = 1. For positive modulation (bit PMOD = 1) the
settings VA1 = 1 and VA0 = 0 is recommended. The V
o(dem)(p-p)
and
V
o
values specified are valid if the
recommended settings are used.
Measured in accordance with the test line given in Fig.3. For the differential phase test the peak white setting is
reduced to 87 %:
a) The differential gain is expressed as a percentage of the difference in peak amplitudes between the largest and
smallest value relative to the subcarrier amplitude at blanking level.
b) The phase difference is defined as the difference in degrees between the largest and smallest phase angle.
10. This parameter is not tested during production but is guaranteed by the design and qualified by means of matrix
batches which are made in the pilot production period.
11. This figure is valid for the complete video signal amplitude (peak white-to-black), see Fig.4.
12. The noise inverter is only active in the ‘strong signal mode’ (no noise detected in the incoming signal).
13. The test set-up and input conditions are given in Fig.5. Measurement is done with an input signal of 10 mV (RMS).
14. Measured at an input signal of 10 mV (RMS). The S/N is the ratio of black-to-white amplitude to the black level noise
voltage (RMS value); B = 5 MHz. Weighted in accordance with CCIR 567.
15. The time-constant of the IF AGC is internal and the speed of the AGC can be set via bus bits AGC1 and AGC0. The
AGC response time is also dependent on the acquisition time of the PLL demodulator. The values given are valid for
the ‘norm’ setting (AGC1 = 0 and AGC0 = 1) and when the PLL is in lock.
16. The AFC control voltage is generated by the digital tuning system of the PLL demodulator. This system uses the
external crystal frequency as a reference and is therefore very accurate. For this reason no maximum and minimum
values are given for the window sensitivity figures. The tuning information is supplied to the tuning system via the
I
2
C-bus. Two bits are reserved for this function. The AFC value is valid only when bit LOCK = 1.
17. Exceeding this amplitude leads to intermodulation distortion.
18. The intercarrier sound (2nd SIF) signal is not normally an analog output signal of the IC. It can be made available on
the DTV output pins by setting bus bits DSIF = 1 and DFIF = 0.
19. The weighted S/N ratio is measured under the following conditions:
a) The vision IF modulator incidental phase modulation for black-to-white jumps must be less than 0.5 degrees
b) QSS AF performance of the vision IF modulator, measured with the television demodulator AMF2 (audio output
and weighted S/N ratio) better than 60 dB (deviation 27 kHz) for 6 kHz sine wave black-to-white modulation
c) Picture-to-sound carrier ratio of the vision IF modulator: PC/SC1 = 13 dB (transmitter)
4.
5.
6.
7.
8.
9.
C
dec
1.5
=
------
×
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