MC44BC374T1 データシートの表示（PDF） - Motorola => Freescale

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MC44BC374T1

PLL Tuned UHF and VHF Audio/Video High Integration Modulator

Motorola => Freescale 

Audio Characteristics

11 Audio Characteristics

Unless otherwise stated: Vcc=5.0V, Ambient Temperture=25oC, Video Input 1Vp-p, 10-step grayscale.

RF output into 75Ohm load. SPECIFICATIONS ONLY VALID FOR ENVELOPE DEMODULATION.

Parameter

Test Conditions

Min Typ Max Unit Type

Picture-to-Sound ratio

PS bit set to 0

PS bit set to 1

13

9

16

12

19

15

dB

B

Using specific pre-emphasis circuit,

audio input level=205mVrms–audio frequency=1kHz

Audio modulation depth

FM modulation: Fs=5.5, 6 or 6.5MHz

100% modulation=±50kHz FM deviation

—

80

—

%

B

FM modulation: NTSC Fs=4.5MHz

100% modulation=±25kHz FM deviation

—

80

—

%

B

Audio input resistance

45 53 61 KΩ A

Audio Frequency response

Reference 0dB at 1kHz,

using specified pre-emphasis circuit,

measure from 50Hz to 15kHz

–2.5 —

+2 dB

C

Audio Distortion FM (THD only)

at 1kHz, 100% modulation (±50kHz)

No video

— 0.4

2

%

C

Audio S/N with Sync Buzz FM See Figure 4

48

53

—

dB

C

Audio Signal to Noise

58

56

54

Typical

52

50

48

Minimum specification

46

471 521 571 621 671 721 771 821 871

Frequency (Mhz)

Figure 5. Typical performances

10

MC44BC374T1 Technical Data

MOTOROLA

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