I’m looking to potentially use the AD725 part in a system. Need some info to make a decision on which encoder (AD723, AD724, AD725) to use, and how to make it support both PAL and NTSC. Thanks for your help.
That's a pretty old part. AD723 and AD724 are 5V only. All 3 of them select NTSC or PAL encoding based on logic level on a pin. They do no scaling-- only color space conversion and encoding. It's all analog-- analog inputs and analog outputs.
I am using AD725 for converting VGA signal to composite. What resolution of VGA video is needed for ntsc encoding? I tried 640x480 and 600x400 - it does not work. What vga clock frequency required for these resolution?
Answered in your other thread... http://ez.analog.com/post!reply.jspa?thread=6976
Hi, that link redirect me not to target thread.
Anyway i have the same problem, so i am trying to scale an original RGB image of 480x640 and then interlazing as ADV725 datasheet said. but it would be better to know a proved VGA timing and resolution output from my FPGA that works in a monitor with NTSC input.
thanks in advance
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