DAC38RF89: Is there a gain block after outputsum block to add a gain to the data before DAC core?

user6193156

Intellectual 290 points

Part Number: DAC38RF89

Hi,

I use DAC38RF89 in wideband DUC mode as figure 33 in the datasheet. I want to add gain to the sum data before DAC core.

Is there a gain block after outputsum block to add a gain to the data before DAC core?

over 2 years ago

0 jim s over 2 years ago

TI__Guru* 91947 points

User,

No, there is no gain block after the summing block. There are individual gain blocks for each DUC called the PAP Gain, but these function as attenuators. See section 8.3.18 of the data sheet for more info regarding this.

Regards,

Jim

0 user6193156 over 2 years ago in reply to jim s

Intellectual 290 points

Jim,

Section 8.2, figure 25,there are two gain blocks,the DACA gain and DACB gain.

Where are the actual positions of these two gain blocks? It seems to be after the summing block.

Regards,

John

0 jim s over 2 years ago in reply to user6193156

TI__Guru* 91947 points

These are the analog full scale output current control per table 45 of section 8.3.27.

+1 user6193156 over 2 years ago in reply to jim s

Intellectual 290 points

Jim,

thank you.

Regards,

John

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DAC38RF89: Is there a gain block after outputsum block to add a gain to the data before DAC core?