Not output clock

sorry,

AD9545

Hi

please send me the stp file you created with ACE and I'll then be able to provide some guidance

Petre

We have attached the file output by ACE.

Please change the file extension from 'txt' to 'cso'.

AD9545_20250519.txt

Circuit configuration

Hi,

I suppose you have an AD9545 eval board and you use ACE with the cso file you attached. If this is the case, the reason why you do not obtain outputs is that you need to execute Sync All command. Just press the button in the GUI shown below.

Then, AD9545 outputs are set as HCSL, 7.5mA by default. You need to configure the AD9545 board to accept them by doing this:

- set jumpers P300, P301, P302 between pins 2 and 3

- use a cable to connect TP307(VOUT_Common) to TP308 (GND). This because the board has the VOUT_COMMON left floating and for HCSL drivers, it needs to be connected to GND.

As an alternative, set the outputs in the GUI as CML for all OUT0A, OUT0B, OUT0C outputs, click then Apply changes and make sure that on the board, jumpers P300, P301, P302 are set between pins 1 and 2.

This is only to get clock outputs on DPLL0+APLL0 path. But the DPLL0 was not configured yet. It is in freerun.

If you tell me what you want to accomplish in relation to the 1PPS reference clock and the 32MHz oscillator (I suppose it is a OCXO), I can create a configuration for you.

Other things to consider:

- 1PPS clock should be DC coupled, possibly 1.2V CMOS or 1.8V CMOS because it is single ended. REFA path is AC coupled. My recommendation is to apply it to REFB or REFBB which are already DC coupled and take out the 50ohm R318 or R319 load on that particular path because a CMOS clock cannot drive 50ohm.

- see what the 32 MHz (OCXO?) output looks like. Most likely you'll be able to plug it in AC coupled way along REFA or REFAA. See it if requires or not 50 ohm loads. The board comes equipped with R306 and R307

The schematic of the board may be found here: https://www.analog.com/en/resources/evaluation-hardware-and-software/evaluation-boards-kits/eval-ad9545.html#eb-documentation

Petre

Thank you for your reply.

Our explanation was insufficient.

We are not using the AD9545 evaluation board.

We have attached the ACE configuration below.

We have configured the registers on the custom board and confirmed that the APLL and DPLL are locked.
However, the clock is not output.
We would like some advice.

Hi,

very sorry for being so late in getting back to you. For some reason, I did not see it.

You need to execute a sync command in order for the output clocks to be generated. You should enable the auto-sync mode in the Wizard for both DPLLs for the outputs to be generated right away.

Then, the eval board cannot generate right away HCSL clocks. You need to set the jumpers P300, P301,..., P304 between pins 2 and 3 and then connect TP307 to TP308.

Petre

Thank you for your reply.
We will check it out, but we are using the custom board.