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AD9237 reference setting

Question asked by Terumasa on Jul 10, 2014
Latest reply on Jul 14, 2014 by Terumasa

Hello

 

Please let me know  about reference setting of  AD9237 soon because  I am designing and need to finish by this week,.

 

Is there any wrong with description of AD9237 datasheet P.18 table 7_Internal Fixed Reference ?

Datasheet Table 7 says below

1: differenctial span 4.0Vp-p :   resulting VREF 0.5V and span factor 1

2: differenctial span 1.0Vp-p : resulting VREF 1.0V and span factor 1

 

But,we think that we need to set resulting VREF = 1.0V and span factor =1  if I need 4v p-p of resulting differenntial span.

Is my understanding correct ?

I reffer  below.

1: SPAN =   4*VREF/  Span factor  described in datasheet P.17

2:  Condtion (VREF = 1.0 V; MODE2 = AVDD)  of 4Vp-p described in deasasheet P.3 table 1

 

If you have any question, please let me know .

I will confirm it and add answer at this thread.

 

Regards,

Terumasa

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