Datasheet
ADV7390/ADV7391/ADV7392/ADV7393 Data Sheet
Rev. J | Page 54 of 107
FILTERS
Table 42 shows an overview of the programmable filters available
on the ADV7390/ADV7391/ADV7392/ADV7393.
Table 42. 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 atten-
uation, 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 38 and Figure 39.
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. Variation
in frequency responses is shown in Figure 35 to Figure 37.
In addition to the chroma filters listed in Table 42, the ADV7390/
ADV7391/ADV7392/ADV7393 contain an SSAF filter that is
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 66). This
filter can be controlled with Bit 0 of Sub-address 0x82, Bit 0.
FREQUENCY (MHz)
0
GAIN (dB)
–10
–30
–50
–60
–20
–40
6543210
EXTENDED (SSAF) PrPb FILTER MODE
06234-067
Figure 66. PrPb SSAF Filter
If this filter is disabled, one of the chroma filters shown in
Table 43 can be selected and used for the CVBS or luma/
chroma signal.
Table 43. 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 1
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 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.
2
3 dB bandwidth refers to the −3 dB cutoff frequency.
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