ML6420 Ver la hoja de datos (PDF) - Micro Linear Corporation

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ML6420

Triple/Dual Phase-Equalized, Low-Pass Video Filter

Micro Linear Corporation 

ML6420

ANALOG IN

ML6420

9.3MHz TYP

ADC

DIGITAL FILTER

HALF-BAND

SIGNAL

PROCESSING

x2

F0 CLOCK

DAC

Figure 13. Oversampled Video Processing System with

Analog LPF & Half-Band Digital Filter

ANALOG OUT

DESIRED PASSBAND

SIGNAL CONTENT

ANALOG FILTER REDUCES

ERRORS FROM F0 TO 2xF0

AT THE INPUT OF

DSP FILTER REDUCES

THE ADC

ANALOG/DIGITAL COMBO

ERRORS FROM F0/2

TO F0 AT THE

YIELDS LOW ALIASING

ERRORS

OUTPUT OF

THE ADC

0Hz

F0/2

F0

2xF0

Figure 14. Digital Filtering in the Frequency Domain

SAMPLING CLOCK

AT OUTPUT

HIGH FREQUENCY ELEMENTS THAT ARE REDUCED IN AMPLITUDE

AND BROADENED TO COVER MORE THAN 1 PIXEL.

0

t

Figure 15. Digital Filtering in the Time Domain

18

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