ADV7301A datasheet(38/68 Pages) AD

38 / 68 page

REV. A

–38–

ADV7300A/ADV7301A

SD Internal Filter Response

[Subaddress 42h, 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/attenua-

tion, 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

can be seen in Figures 41–59.

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

in the range from –4 dB to +4 dB. The desired response can be

chosen by the user by programming the correct value via the

2C. The variation of frequency responses can be seen in

Figures 41–59.

In addition to the chroma filters listed above, the ADV7300A/

ADV7301A 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 approximately 2.7 MHz

and –40 dB at 3.8 MHz, as shown in Figure 41. This filter can

be controlled via Address 42h, Bit 0. If this filter is disabled, the

selectable chroma filters shown in Table XVI can be used for

the CVBS or chroma signal.

Table XVI. Internal Filter Specifications

Pass-Band

3 dB

Filter

Ripple1 (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

NOTES

1Pass-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, 0 Hz to f1 (Hz) and f2 (Hz) to infinity for

a notch filter, where fc, f1, f2 are the –3 dB points.

2+3 dB bandwidth refers to the –3 dB cutoff frequency.

FREQUENCY – MHz

–10

–30

–50

–60

–20

–40

Figure 41. UV SSAF Filter

FREQUENCY – MHz

02468

–10

–30

–50

–60

–70

–20

–40

Figure 42. Luma NTSC Low-Pass Filter

FREQUENCY – MHz

02468

–10

–30

–50

–60

–70

–20

–40

Figure 43. Luma PAL Low-Pass Filter

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