ADV7341_15 datasheet(58/108 Pages) AD

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ADV7340/ADV7341

Data Sheet

Rev. C | Page 58 of 108

Figure 62. PrPb SSAF Filter

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

Table 44 can be selected and used for the CVBS or luma/

chroma signal.

Table 44. 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

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

pass band, measured in decibels. 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.

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 63 and Figure 64.

Figure 63. ED/HD Sinc Compensation Filter Enabled

Figure 64. ED/HD Sinc Compensation Filter Disabled

ED/HD TEST PATTERN COLOR CONTROLS

Subaddress 0x36 to Subaddress 0x38

Three 8-bit registers at Subaddress 0x36 to Subaddress 0x38

are used to program the output color of the internal ED/HD

test pattern generator (Subaddress 0x31, Bit 2 = 1), whether it

be the lines of the crosshatch pattern or the uniform field test

pattern. They are not functional as color controls for external

pixel data input.

The values for the luma (Y) and the color difference (Cr and

Cb) signals used to obtain white, black, and saturated primary

and complementary colors conform to the ITU-R BT.601-4

standard.

FREQUENCY (MHz)

–10

–30

–50

–60

–20

–40

EXTENDED (SSAF) PrPb FILTER MODE

FREQUENCY (MHz)

0.5

–0.5

0.4

0.1

–0.2

–0.3

–0.4

0.3

0.2

–0.1

FREQUENCY (MHz)

0.5

–0.5

0.4

0.1

–0.2

–0.3

–0.4

0.3

0.2

–0.1

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