MC44BC374T1 Просмотр технического описания (PDF) - Motorola => Freescale

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производитель

MC44BC374T1

PLL Tuned UHF and VHF Audio/Video High Integration Modulator

Motorola => Freescale 

Characterization Measurement Conditions

12 Characterization Measurement Conditions

Device default configuration unless otherwise specified:

• Peak White Clip enable

• UHF oscillator ON

• Sound and video modulators ON

• Sound subcarrier frequency = 5.5Mhz

• Sound Oscillator ON

• Picture-to-sound carrier ratio = 12dB

• Test pattern disabled

• All test mode bits are ‘0’

• Frequency from channel 21 to 69

RF Inputs / Output into 75ohm Load using a 75 to 50 ohm transformation. Video Input 1V pk-pk. Audio

pre-emphasis circuit engaged.

Device and Signals Set-up

Video: 10 steps grey scale

No audio

“ATT” bit = 1

No Video signal

No Audio signal

Measurement Set-up

TVOUT output level

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”.

Sound Subcarrier Harmonics

Measure in dBc second and third sound harmonics levels in reference to

picture carrier (TVout_Ref).

Video: 10 steps grey scale

No Audio signal

Picture carrier

Sound carrier

Sound

2nd harm

Sound

3rd harm

Fo +5.5Mhz +11Mhz +16.5Mhz

MOTOROLA

MC44BC374T1 Technical Data

11

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