MC44BC374T1D FREESCALE [Freescale Semiconductor, Inc], MC44BC374T1D Datasheet - Page 14

• Manufacturer Part Number: MC44BC374T1D
• Description: PLL Tuned PAL/NTSC UHF and VHF Audio/Video High Integration Modulator IC
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Characterization Measurement Conditions
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
MC44BC374T1 Technical Data
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%
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.
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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
=
the largest positive or negative difference
Picture carrier
Measurement Set-up
Fo
the amplitude at position 0
+5.5Mhz
(not to scale), line CCIR 330.
0
Sound carrier
1
2
3
A(mV)
B(mV)
B (0.6 - 3mV)
4
A ( 6-10mV)
5
*
100%