mc44bc375u Freescale Semiconductor, Inc, mc44bc375u Datasheet - Page 10

• Manufacturer Part Number: mc44bc375u
• Description: Pll Tuned Vhf Channel 3 / 4 Audio / Video Modulator
• Manufacturer: Freescale Semiconductor, Inc

Table 9. Performance Measurement Test Set-Ups (continued)
MC44BC375U
10
Video: 100% White video signal — 1 Vpk-pk.
No audio signal
This is measured using a Demodulator in B/G
using a CCIR Rec. 567 weighting network,
100 KHz to 5.0 MHz band with sound trap
and envelope detection, and a Video
Analyzer.
Same as above with CCIR filter disabled.
Video: 5 step Grey Scale — 1 V
No audio signal
This is measured using a Demodulator in B/G
using a CCIR Rec. 567 weighting network,
100 KHz to 5.0 MHz band with sound trap,
and envelope detection, and a Video
Analyzer.
Video: 5 step Grey Scale — 1 V
No audio signal
This is measured using a Demodulator in B/G
using a CCIR Rec. 567 weighting network,
100 KHz to 5.0 MHz band with sound trap
and envelope detection, and a Video
Analyzer.
Device and Signals Set-Up
(pp)
(pp)
.
.
Unweighted Video Signal to Noise
Weighted Video Signal to Noise
The Video Analyzer measures the ratio between the amplitude of the active area
of the video signal (700 mV) and the noise level in Vrms on a video black level
which is shown below.
VideoS/N is calculated as 20 x log(700 /N) in dB.
Same as above.
On line CCIR 330, the video analyzer DP measure consists of calculating the
difference of the Chroma phase at the black level and the different chroma
subcarrier phase angles at each step of the greyscale. The largest positive or
negative difference indicates the distortion.
The video analyzer method takes the worst step from the first 4 steps.
On line CCIR 330 shown below, the video analyzer DG measure consists of
calculating the difference of the Chroma amplitude at the black level and the
different amplitudes at each step of the greyscale. The largest positive or
negative difference indicates the distortion.
The video analyzer method takes the worst step from the first 4 steps.
CCIR line 330 corresponds to FCC line 17 in NTSC/M standard.
Video Differential Phase
Video Differential Gain
DIFF PHASE =
DIFF GAIN
5-step Greyscale with Chroma subcarrier superimposed
=
the largest positive or negative difference
the largest positive or negative difference
Measurement Set-Up
(not to scale), line CCIR 330.
the amplitude at position 0
the phase at position 0
noise level in Vrms
0
N
1
2
3
4
Application Specific Products
5
Freescale Semiconductor
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*
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