ADV7180WBSTZ datasheet(21/120 Pages) AD

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Data Sheet

ADV7180

Rev. G | Page 21 of 120

ANTIALIASING FILTERS

The ADV7180 has optional on-chip antialiasing (AA) filters on

each of the three channels that are multiplexed to the ADC (see

Figure 15). The filters are designed for standard definition video

up to 10 MHz bandwidth. Figure 16 and Figure 17 show the

filter magnitude and phase characteristics.

The antialiasing filters are enabled by default and the selection

of INSEL[3:0] determines which filters are powered up at any

given time. For example, if CVBS mode is selected, the filter

circuits for the remaining input channels are powered down to

conserve power. However, the antialiasing filters can be disabled

or bypassed using the AA_FILT_MAN_OVR control.

AIN1

AIN2

AIN3

AIN41

AIN51

AIN61

FILTER 1

FILTER 2

FILTER 3

10-BIT, 86MHz

ADC

SHA

A/D

1ONLY AVAILABLE IN 64-LEAD AND 48-LEAD PACKAGES.

Figure 15. Antialias Filter Configuration

AA_FILT_MAN_OVR, Antialiasing Filter Override,

Address 0xF3[3]

This feature allows the user to override the antialiasing filters

on/off settings, which are automatically selected by INSEL[3:0].

AA_FILT_EN, Antialiasing Filter Enable, Address 0xF3[2:0]

These bits allow the user to enable or disable the antialiasing

filters on each of the three input channels multiplexed to the

ADC. When disabled, the analog signal bypasses the AA filter

and is routed directly to the ADC.

AA_FILT_EN, Address 0xF3[0]

When AA_FILT_EN[0] is 0, AA Filter 1 is bypassed.

When AA_FILT_EN[0] is 1, AA Filter 1 is enabled.

AA_FILT_EN, Address 0xF3[1]

When AA_FILT_EN[1] is 0, AA Filter 2 is bypassed.

When AA_FILT_EN[1] is 1, AA Filter 2 is enabled.

AA_FILT_EN, Address 0xF3[2]

When AA_FILT_EN[2] is 0, AA Filter 3 is bypassed.

When AA_FILT_EN[2] is 1, AA Filter 3 is enabled.

–36

100M

FREQUENCY (Hz)

10k

100k

10M

–4

–8

–12

–16

–20

–24

–28

–32

Figure 16. Antialiasing Filter Magnitude Response

–150

100M

FREQUENCY (Hz)

10k

100k

10M

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

–110

–120

–130

–140

Figure 17. Antialiasing Filter Phase Response

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