adv7322 Analog Devices, Inc., adv7322 Datasheet - Page 49

• Manufacturer Part Number: adv7322
• Description: Multiformat 11-bit Hdtv Video Encoder
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
FILTERS
Table 27 shows an overview of the programmable filters
available on the ADV7322.
Table 27. Selectable Filters
Filter
SD Luma LPF NTSC
SD Luma LPF PAL
SD Luma Notch NTSC
SD Luma Notch PAL
SD Luma SSAF
SD Luma CIF
SD Luma QCIF
SD Chroma 0.65 MHz
SD Chroma 1.0 MHz
SD Chroma 1.3 MHz
SD Chroma 2.0 MHz
SD Chroma 3.0 MHz
SD Chroma CIF
SD Chroma QCIF
SD UV SSAF
HD Chroma Input
HD Sinc Filter
HD Chroma SSAF
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 I
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.
2
C [Subaddress 0x62]. The variation of
Subaddress
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x42
0x13
0x13
0x13
Rev. PrA | Page 49 of 88
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.
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
Luma LPF NTSC
Luma LPF PAL
Luma Notch NTSC
Luma Notch PAL
Luma SSAF
Luma CIF
Luma QCIF
Chroma 0.65 MHz
Chroma 1.0 MHz
Chroma 1.3 MHz
Chroma 2.0 MHz
Chroma 3.0 MHz
Chroma CIF
Chroma QCIF
1
2
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.
3 dB bandwidth refers to the −3 dB cutoff frequency.
–10
–20
–30
–40
–50
–60
0
0
1
Figure 65. UV SSAF Filter
EXTENDED UV FILTER MODE
Pass-Band
Ripple
0.16
0.1
0.09
0.1
0.04
0.127
Monotonic
Monotonic
Monotonic
0.09
0.048
Monotonic
Monotonic
Monotonic
2
FREQUENCY (MHz)
1
3
(dB)
4
3 dB Bandwidth
(MHz)
4.24
4.81
2.3/4.9/6.6
3.1/5.6/6.4
6.45
3.02
1.5
1.395
2.2
3.2
0.65
1
0.65
0.5
5
ADV7322
6
2