Alex_777

AD9957 output level in quadrature modulation mode

Discussion created by Alex_777 on Mar 30, 2016
Latest reply on Apr 1, 2016 by Alex_777

Hello.

I use AD9957 in quadrature modulation mode. The hardware configuration: DAC_RSET - 10K, 18 bit Parallel data bus .

All works good, but the output level on pin 4  of Transformer T1  (schematic is attached) not more then (-12dBm), measured by HP 8935. Data on parallel bus with amplitude +- 131071.

 

Register configuration:

AUX_DAC_FSC  - 0x7F

Profile_0_QDUC_FSC - 0xFF

Please tell me:

1) (-12dBm) is normally level for my configuration ?

2) Can I use instead of Transformer T1, for example AD8021?

 

Thanks.

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