mc44bc375u Freescale Semiconductor, Inc, mc44bc375u Datasheet - Page 8

• 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
MC44BC375U
8
Video: 10 steps grey scale
No audio
Video: 10 steps grey scale
No audio signal
No audio
Video: a 700 mV
signal is inserted on the black level of active
video area.
Device default configuration unless otherwise specified:
Sound subcarrier frequency = 5.5 MHz
Picture-to-sound carrier ratio = 14 dB
CH3 and CH4 frequencies
Frequency
100 kHz
Frequency
100kHz
Device and Signals Set-Up
(pp)
100 kHz sinusoidal
CHARACTERIZATION MEASUREMENT CONDITIONS
700 mVpkpk
700mV pk-pk
Second Harmonics of Chroma Subcarrier
Measured picture carrier in dBµV with the HP8596E Spectrum Analyzer using a
75 to 50 Ω transformation, all cables losses and transformation pads having been
calibrated.
Measurement is used as a reference for other tests: RFout_Ref
Measure in dBc second and third sound harmonics levels in reference to picture
carrier (RFout_Ref).
Measure in dBc, in reference to picture carrier (RFout_Ref), second harmonic of
chroma at channel frequency plus 2 times chroma frequency, resulting in the
following spectrum.
Sound Subcarrier Harmonics
RF
OUT
Output Level
Picture carrier
Picture carrier
•
•
•
Fo
RF Inputs / Output into 75 Ω Load using a 75 to 50 Ω
transformation
Video Input 1.0 V pk-pk
Audio pre-emphasis circuit engaged
Fo
Chroma
carrier
Sound carrier
Measurement Set-Up
+4.43 MHz +5.5 MHz
+5.5 MHz
Sound
2nd harm
+11 MHz +16.5 MHz
Sound
carrier
Chroma 2nd
Harmonic
+8.86 MHz
Application Specific Products
Sound
3rd harm
Freescale Semiconductor