mc44bc373c Freescale Semiconductor, Inc, mc44bc373c Datasheet - Page 15

• Manufacturer Part Number: mc44bc373c
• Description: Pll Tuned Uhf And Vhf Audio/video High Integration Modulator
• Manufacturer: Freescale Semiconductor, Inc

Video: 5 step Grey Scale- 1Vpk-pk.
No Audio signal
This is measured using a Rohde &
Schwarz AMFS UHF Demodulator in B/G
(using a CCIR Rec. 567 weighting
network, 100kHz to 5MHz band with sound
trap and envelope detection, and a Rohde
& Schwarz UAF Video Analyzer.
No Audio signal
Video: 10 step grey scale
No Video signal
No Audio Signal
“PS” bit set to 0 and 1
Video Black Level
Audio signal: 1Khz, 205mVrms.
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G and a
HP8903A Audio Analyzer at 1kHz
Device and Signals Set-up
Freescale Semiconductor, Inc.
For More Information On This Product,
Audio Modulation Depth - FM Modulation
MC44BC373C/374C Technical Data
Go to: www.freescale.com
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.
This is measured using a HP8596E Spectrum Analyzer with a TV
Trigger option, allowing demodulation and triggering on any specified TV
Line. The analyzer is centred on the maximum peak of the Video signal
and reduced to zero Hertz span in Linear mode to demodulate the Video
carrier.
The Modulation Depth is calculated as (A-B)/A x 100 in%
Same measurement method for L standard, with inverted video.
Measure in dBc sound carrier in reference to picture carrier (TVout_Ref)
for “PS” bit=0 (PS=12dB typical) and for “PS” bit=1 (PS=16dB),
The audio signal 205mV at 1kHz is supplied by the Audio Analyzer, and
the FM demodulated signal deviation is indicated on the Demodulator in
Khz peak.
This value is then converted in% of FM deviation, based on specified
standards.
Video Modulation Depth
Video Differential Gain
Picture to Sound ratio
DIFF GAIN
TV Line Demodulated by Spectrum Analyzer-BG standard
5-step Greyscale with Chroma subcarrier superimposed
=
Characterization Measurement Conditions
the largest positive or negative difference
Picture carrier
Measurement Set-up
Fo
the amplitude at position 0
(not to scale), line CCIR 330.
+5.5Mhz
0
Sound carrier
1
2
3
A(mV)
B(mV)
B (0.6 - 3mV)
4
A ( 6-10mV)
5
*
100%