mc44bc373c Freescale Semiconductor, Inc, mc44bc373c Datasheet - Page 12

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

Characterization Measurement Conditions
12 Characterization Measurement Conditions
Device default configuration unless otherwise specified:
RF Inputs / Output into 75ohm Load using a 75 to 50 ohm transformation. Video Input 1V pk-pk.
Audio pre-emphasis circuit engaged.
Video: 10 steps grey scale
No audio
“ATT” bit = 1
No Video signal
No Audio signal
Video: 10 steps grey scale
No Audio signal
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Device and Signals Set-up
Peak White Clip enable
UHF oscillator ON
Sound and video modulators ON
Sound subcarrier frequency = 5.5Mhz
TB1 bit set to ‘0’ (bus format not compatible with MC44353)
Sound Oscillator ON
Logic Output Port LOW
Picture-to-sound carrier ratio = 12dB
System L disabled
Test pattern disabled
All test mode bits are ‘0’
Frequency from channel 21 to 69
Freescale Semiconductor, Inc.
For More Information On This Product,
MC44BC373C/374C Technical Data
Sound Subcarrier Harmonics
Go to: www.freescale.com
Measured picture carrier in dBuV with the HP8596E Spectrum Analyzer
using a 75 to 50 ohm transformation, all cables losses and
transformation pads having been calibrated.
Measurement used as a reference for other tests: TVout_Ref
TVOUT output attenuation
Measure in dBc picture carrier at “ATT”=”1” with reference to picture
carrier at “ATT”=”0”.
Measure in dBc second and third sound harmonics levels in reference to
picture carrier (TVout_Ref).
TVOUT output level
Picture carrier
Fo
Sound carrier
Measurement Set-up
+5.5Mhz
Sound
2nd harm
+11Mhz +16.5Mhz
Sound
3rd harm