ADV7340EBZ datasheet(53/88 Pages) AD

53 / 88 page

ADV7340/ADV7341

Rev. 0 | Page 53 of 88

FILTERS

Table 39 shows an overview of the programmable filters

available on the ADV7340/ADV7341.

Table 39. 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 Chroma Input

0x33

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 39 and Figure 40.

If SD SSAF gain is enabled (Subaddress 0x87, Bit 4), there are 13

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

can be programmed using Subaddress 0xA2. The variation of

frequency responses is shown in Figure 36 to Figure 38.

In addition to the chroma filters listed in Table 39, the ADV7340

/ADV7341 contain 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 65). This filter can be controlled with Subaddress

0x82, Bit 0.

FREQUENCY (MHz)

–10

–30

–50

–60

–20

–40

EXTENDED (SSAF) PrPb FILTER MODE

Figure 65. PrPb SSAF Filter

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

Table 40 can be selected and used for the CVBS or luma/

chroma signal.

Table 40. 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.

ED/HD Sinc Compensation Filter Response

Subaddress 0x33, Bit 3

The ADV7340/ADV7341 include a filter designed to counter

the effect of sinc roll-off in DAC 1, DAC 2, and DAC 3 while

operating in ED/HD mode. This filter is enabled by default. It

can be disabled using Subaddress 0x33, Bit 3. The benefit of the

filter is illustrated in Figure 66 and Figure 67.

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