MC44BC374T1 查看數據表（PDF） - Freescale Semiconductor

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MC44BC374T1

PLL Tuned UHF and VHF Audio/Video High Integration Modulator

Freescale Semiconductor 

Audio Characteristics Freescale Semiconductor, Inc.

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

Picture-to-Sound ratio

Audio modulation depth

Audio input resistance

Audio Frequency response

Audio Distortion FM (THD only)

Audio S/N with Sync Buzz FM

Test Conditions

Min Typ

PS bit set to 0

PS bit set to 1

13 16

9

12

Using specific pre-emphasis circuit,

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

FM modulation: Fs=5.5, 6 or 6.5MHz

100% modulation=±50kHz FM deviation

—

80

FM modulation: NTSC Fs=4.5MHz

100% modulation=±25kHz FM deviation

—

80

45 53

Reference 0dB at 1kHz,

using specified pre-emphasis circuit,

measure from 50Hz to 15kHz

–2.5 —

at 1kHz, 100% modulation (±50kHz)

No video

— 0.4

See Figure 4

48 53

Max

19

15

—

—

61

+2

2

—

Unit Type

dB

B

%

B

%

B

KΩ A

dB

C

%

C

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

MC44BC374T1 Technical Data

For More Information On This Product,

Go to: www.freescale.com

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