ADV7322 datasheet(49/88 Pages) AD

49 / 88 page

Preliminary Technical Data

ADV7322

Rev. PrA | Page 49 of 88

FILTERS

Table 27 shows an overview of the programmable filters

available on the ADV7322.

Table 27. Selectable Filters

Filter

Subaddress

SD Luma LPF NTSC

0x40

SD Luma LPF PAL

0x40

SD Luma Notch NTSC

0x40

SD Luma Notch PAL

0x40

SD Luma SSAF

0x40

SD Luma CIF

0x40

SD Luma QCIF

0x40

SD Chroma 0.65 MHz

0x40

SD Chroma 1.0 MHz

0x40

SD Chroma 1.3 MHz

0x40

SD Chroma 2.0 MHz

0x40

SD Chroma 3.0 MHz

0x40

SD Chroma CIF

0x40

SD Chroma QCIF

0x40

SD UV SSAF

0x42

HD Chroma Input

0x13

HD Sinc Filter

0x13

HD Chroma SSAF

0x13

SD Internal Filter Response

[Subaddress 0x40 [7:2]; Subaddress 0x42, Bit 0]

The Y filter supports several different frequency responses

including two low-pass responses, two notch responses, an

extended (SSAF) response with or without gain boost

attenuation, a CIF response, and a QCIF response. The UV filter

supports several different frequency responses including six

low-pass responses, a CIF response, and a QCIF response, as

shown in Figure 35 and Figure 36.

If SD SSAF gain is enabled, there is the option of 12 responses

in the range −4 dB to +4 dB [Subaddress 0x47, Bit 4]. The

desired response can be chosen by the user by programming the

correct value via the I2C [Subaddress 0x62]. The variation of

frequency responses are shown in Figure 32 and Figure 33.

In addition to the chroma filters listed in Table 27, the

ADV7322 contains an SSAF filter specifically designed for and

applicable to the color difference component outputs, U and V.

This filter has a cutoff frequency of about 2.7 MHz and –40 dB

at 3.8 MHz, as shown in Figure 65. This filter can be controlled

with Address 0x42, Bit 0.

FREQUENCY (MHz)

–10

–30

–50

–60

–20

–40

EXTENDED UV FILTER MODE

Figure 65. UV SSAF Filter

If this filter is disabled, the selectable chroma filters shown in

Table 28 can be used for the CVBS or luma/chroma signal.

Table 28. Internal Filter Specifications

Filter

Pass-Band

Ripple1 (dB)

3 dB Bandwidth2

(MHz)

Luma LPF NTSC

0.16

4.24

Luma LPF PAL

0.1

4.81

Luma Notch NTSC

0.09

2.3/4.9/6.6

Luma Notch PAL

0.1

3.1/5.6/6.4

Luma SSAF

0.04

6.45

Luma CIF

0.127

3.02

Luma QCIF

Monotonic

1.5

Chroma 0.65 MHz

Monotonic

0.65

Chroma 1.0 MHz

Monotonic

Chroma 1.3 MHz

0.09

1.395

Chroma 2.0 MHz

0.048

2.2

Chroma 3.0 MHz

Monotonic

3.2

Chroma CIF

Monotonic

0.65

Chroma QCIF

Monotonic

0.5

1 Pass-band ripple is the maximum fluctuation from the 0 dB response in the

pass band, measured in dB. The pass band is defined to have 0 Hz to fc (Hz)

frequency limits for a low-pass filter, and 0 Hz to f1 (Hz) and f2 (Hz) to infinity

for a notch filter, where fc, f1, and f2 are the −3 dB points.

2 3 dB bandwidth refers to the −3 dB cutoff frequency.

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