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Forum Index : Microcontroller and PC projects : Fiber (fibre) optic transceiver
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| Tinine Guru  Joined: 30/03/2016 Location: United KingdomPosts: 1646 |
Can anyone see why this Click module is limited to 512Kbs? Seems really slow to me. I have submitted a question to Mikroe but they take forever and a day to respond. Schematic is in the attached PDF. fiber-opt-click-schematic-v201.pdf Craig |
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bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2867 |
Hi Craig, Where did you see 512kbs? The chip itself is quoted at 5MHz which if you assume 10bit per byte (8bit data plus 1 start and 1 stop bit) that would men 512kB (ie k BYTEs) per sec. Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5705 |
The transmitter looks fast enough, but the receiver is using a shaper followed by a level shifter. I suspect it's the pulse shaper that's slowing things down to ensure that you get nice, clean output pulses. 5MHz is the gain bandwidth product of the op amp. It only has a bandwidth of 5MHz when the gain is one. As you increase the gain (as is done here) the maximum frequency falls. The transmitter is using a unity gain buffer, so will manage the full 5MHz in theory. . Edited 2022-10-03 18:03 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Tinine Guru Joined: 30/03/2016 Location: United KingdomPosts: 1646 |
@bigmik Hi Mick, Right on the main page....could've sworn that I saw another spec' that claimed a much higher speed but maybe it was my imagination...dunno.  |
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| Tinine Guru Joined: 30/03/2016 Location: United KingdomPosts: 1646 |
From Mikroe: "component P1 and resistors R1, R7 limits the speed" No biggie. 230KBAUD will already be overkill for what I need. Craig |
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