ADV7392EBZ datasheet(49/96 Pages) AD

49 / 96 page

ADV7390/ADV7391/ADV7392/ADV7393

Rev. 0 | Page 49 of 96

FILTERS

Table 38 shows an overview of the programmable filters

available on the ADV739x.

Table 38. Selectable Filters

Filter

Subaddress

SD Luma LPF NTSC

0x80

SD Luma LPF PAL

0x80

SD Luma Notch NTSC

0x80

SD Luma Notch PAL

0x80

SD Luma SSAF

0x80

SD Luma CIF

0x80

SD Luma QCIF

0x80

SD Chroma 0.65 MHz

0x80

SD Chroma 1.0 MHz

0x80

SD Chroma 1.3 MHz

0x80

SD Chroma 2.0 MHz

0x80

SD Chroma 3.0 MHz

0x80

SD Chroma CIF

0x80

SD Chroma QCIF

0x80

SD PrPb SSAF

0x82

ED/HD Sinc Compensation Filter

0x33

ED/HD Chroma SSAF

0x33

SD Internal Filter Response

Subaddress 0x80, Bits[7:2]; Subaddress 0x82, 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 PrPb

filter supports several different frequency responses, including

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

shown in Figure 36 and Figure 37.

If SD Luma SSAF gain is enabled (Subaddress 0x87, Bit 4), there

are 13 response options in the range −4 dB to +4 dB. The desired

response can be programmed using Subaddress 0xA2. The

variation of frequency responses are shown in Figure 33 to

Figure 35.

In addition to the chroma filters listed in Table 38, the ADV739x

contains an SSAF filter specifically designed for the color difference

component outputs, Pr and Pb. This filter has a cutoff frequency

of ~2.7 MHz and a gain of –40 dB at 3.8 MHz (see Figure 67).

This filter can be controlled with Subaddress 0x82, Bit 0.

FREQUENCY (MHz)

–10

–30

–50

–60

–20

–40

EXTENDED (SSAF) PrPb FILTER MODE

Figure 67. PrPb SSAF Filter

If this filter is disabled, one of the chroma filters shown in

Table 39 can be selected and used for the CVBS or luma/

chroma signal.

Table 39. Internal Filter Specifications

Filter

Pass-Band

Ripple (dB)1

3 dB Bandwidth (MHz)2

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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