Analog Devices ADV8005, Hardware Reference Manual

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ADV8005 Hardware Reference Manual UG-707
Note: Table 3 does not list the definitive operation of the device in each mode. For example, in mode 3, it is listed as possible to have two different
output resolutions and just have OSD on a single output. However, using the output muxing, it would also be possible to have a single output
format (1080p in this case) with OSD going to several outputs.
Table 3 provides only a guideline for the ADV8005 and should be used as such.
Depending on user requirements, many of these modes could be tailored to a specific solution. Section 2.1.2 to Section 2.1.9 describe the usable
modes of operation as recommended by ADI. These modes should be studied and the appropriate one selected for a given application.
2.1.1. Selecting a Mode
General guidelines for selecting a mode of operation involve selecting the location of certain blocks in the VSP section. For example, mode 5
and mode 6 both use the PVSP and SVSP in parallel. However, as the SVSP can only accept progressive formats, input video to the
ADV8005
must be progressive. If interlaced, only the PVSP can be used. Therefore, a note should be kept of the input formats if selecting these in parallel
mode.
The location of the OSD blend core must then be selected. This can be placed before the PVSP and both the input video and OSD can be scaled
at the same time. However, depending on the application, the optimal solution may be to have both the input video and OSD scaled separately
and then blended.
If blending the OSD after the PVSP, the OSD may need to be scaled to different resolutions. This can be done in two ways:
1. The OSD bitmap images are created at higher resolutions.
2. The OSD can be rendered at a single resolution and scaled internally in the ADV8005 using the OSD scaler.
There are limitations to both of these methods. Rendering OSDs at larger resolutions increases the system resources required to store these
bitmaps. Alternatively, scaling the OSD internally in the part increases power consumption on the
ADV8005 .
The optimum solution to this depends on customer requirements and system capabilities. It should be chosen taking these considerations into
account.
Note: For the following modes of operation, red indicates an active video path and black indicates a path is not used. If, for example, there are
two red dashed lines, video may be available on one or the other but not on both.
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