MC44BC373/4C 데이터 시트보기 (PDF) - Freescale Semiconductor

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MC44BC373/4C

PLL-Tuned UHF and VHF Audio/Video High-Integration Modulator

Freescale Semiconductor 

Characterization Measurement Conditions

FM Audio Weighted Signal to Noise

58

56

Typical

54

52

50

Minimum specification

48

46

471 521

571 621 671 721 771

Frequency (Mhz)

821 871

Figure 5. Typical Audio Performance

14 Characterization Measurement Conditions

Table 23 shows the MC44BS373CA default configuration unless otherwise specified.

Table 23. Device Default Configuration

Device Feature

Peak white clip

UHF oscillator

Sound and video modulators

Sound subcarrier frequency

Sound oscillator

Sound PLL reference frequency

Logic output port

Picture-to-sound carrier ratio

System L

Test pattern

All test mode bits

Frequency

Default Setting

Enabled

On

On

5.5 MHz

On

31.25 kHz

Low

12 dB

Disabled

Disabled

Zero

From channel 21 to 69

RF inputs/output into 75-Ω load using a 75- to 50-Ω transformation. Video input 1 Vp-p. Audio

pre-emphasis circuit enabled.

Table 24. Measurement Conditions

Device and Signal Set-Up

Measurement Set-Up

Video: 10-step grey scale

No audio

TVOUT Output Level

Measured picture carrier in dBµV with the HP8596E spectrum analyzer

using a 75- to 50-Ω transformation, all cable losses and transformation

pads having been calibrated.

Measurement used as a reference for other tests: TVout_Ref

MC44BS373CA Data Sheet

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