GS4881 查看數據表（PDF） - Gennum -> Semtech

零件编号

产品描述 (功能)

生产厂家

GS4881

Monolithic Video Sync Separators

Gennum -> Semtech 

CH1

CH2

VIDEO

2

0.1μF

75W

4

8

6

680k 0.1μ

Figure 5-2: Test Circuit 1 and Video Waveforms for 0.1μF

CH1

CH2

VIDEO

2

0.01μF

75W

4

8

6

680k 0.1μ

Figure 5-3: Test Circuit 2 and Video Waveforms for 0.01μF

The interfering hum component is defined by:

vHUM(t) = VPcos(2 πƒHUMt)

where: VP = Peak voltage of AC hum

ƒHUM = Frequency of hum (50Hz or 60Hz)

The maximum rate of change of this hum signal occurs at the zero crossing points and is:

dv HUM

dt

π 3π

t= ,

22

= ± VP2πƒHUM

Since the horizontal scan period is much faster than the period of the interference

(63.5ms << 1/ƒHUM) a good approximation is to assume that the maximum line to line

voltage change resulting from the interfering hum is:

∆VHUM = ± V P2πƒHUM TLINE

where: TLINE = 63.5μs

GS1881, GS4881, GS4981 Monolithic Video Sync

Separators

Data Sheet

6926 - 5

November 2009

21 of 29

Proprietary & Confidential

Share Link: