I am using hte AD9524 and noticed that the datasheet was revised in Feb. 2013. There are a number of changes including the elimination of PLL2 1.8V pin which is now a no connect. There appears to be a number of page number references that are incorrect under the 2/13 revision. Without having to go through the entire datasheet, are there any changes I would have to make to my current design besides removing the 1.8V supply to pin 42. Also, has the simulation model for it been updated as well?
Also, how can I tell a new device revision from the prior one? It is strictly by date code?
Pin 42 is an internal no connect therefore you can leave 1.8V connected to this pin. So no changes are required on your board.
The datasheet should not have been released to the website at this time because the inventory of the previous version has not be depleted. This will take place very soon. But no harm since there is no impact to board design or programming between versions.
A Product Change Notice is in a almost ready to be released. This notice will give details of date codes, no product has been released at this time.
Below is change information contained in the PCN.
Description Of Change
Change 1: varactors added to VCO Change 2: Charge pump was switched to an internally regulated supply (LDO) Change 3: VDD3_PLL1, Supply Current for PLL1 increased from 25 to 43 mA, Max power dissipation in typical configuration changes from 680 mW to 593 mW, and Max power dissipation in Low power typical configuration increased from 428 mW to 450 mW Change 4: Max skew between LVPECL, HSTL and LVDS Outputs increased from 164ps to 234ps
Reason For Change
Change 1: Extend the supported temperature range for the AD9523/24 VCO Change 2: Eliminate one power supply requirement for customers Change 3: Results from change 2 Change 4: Necessary per characterization of new die
Impact of the change (positive or negative) on fit, form, function & reliability
Change 1: Improves performance across temperature Change 2: Pin 2 uses more current. Change 3: Tables 2 and 3 in data sheet has been updated to reflect new supply current Change 4: Table 10 in data sheet has been updated to reflect new supply current