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Jumper settings for AD9508 Pin Programming

Question asked by jpotter0 on Apr 20, 2016
Latest reply on Apr 22, 2016 by pkern

I want to setup the AD9508 in the pin programming mode. If I understand correctly this allows you to use the chip without a computer to program it. What I want to do is pretty simple. I want to distribute an HSTL (really LVPECL) signal to the HSTL outputs with a 1:1 division ratio. I have a differential input signal of 1.16 V p-p at 491.52 MHz. I have removed the balun and configured the board for differential input. There are a lot of jumpers that I don't have information on. I left all of them alone, but I did adjust the Pin Programming jumpers to what I think is my requirement.

 

The jumpers are: P510 jumpered

P508 jumper on top pair connecting pin 1 to 4 Vdc

P301 Jumper to left EN

P507 3V selected

P506 jumper sat bottom DD_U jumpered to VDD_LDO

P505 VDD_CORE jumpered

P124 jumpered

P125 jumpered

P305 Jumper to left (I think this one doesn't matter)

P306 Jumper to left (I think this one doesn't matter)

P304 jumpered

P102 Jumper right (PPR - I assume that means Pin Programming)

P103 Left (820 Ohms)

P104 No jumper

P105 Right (Pull Down)

P106 Jumper right (PPR - I assume that means Pin Programming)

P107 Left (820 Ohms)

P108 No jumper

P109 Right (Pull Down)

P110 Jumper right (PPR - I assume that means Pin Programming)

P111 Left (820 Ohms)

P112 No jumper

P113 Right (Pull Down)

P114 Jumper right (PPR - I assume that means Pin Programming)

P115 Left (820 Ohms)

P116 No jumper

P117 Right (Pull Down)

P100 Left (differential In)

P101 Left S-Pin

P120 Right (Pull Down)

P118 Left (820 Ohms)

P119 No jumper

P121 Left (820 Ohms)

P122 No jumper

P123 Right (Pull Down)

 

I think that's all of them. Obviously I've done something wrong. There is no output with a 1.16 V p-p differential input.

If there's anyone familiar enough with this board to point out my mistake(s) I'd greatly appreciate it.

 

Thanks,

 

Jim

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