DAC38RF82: configuration check

Vincenzo Pizzolante

Part Number: DAC38RF82
Other Parts Discussed in Thread: DAC38RF89

hi,

we would like to have an I/Q output (2TX) with sampling rate of 6.398GHz in an interpolation x2 mode (data rate 3.199GSPS at 12-bit, frame assembly 82380).

From what I understand, this can be supported by DAC38RF82 using its VCOL configured at 6.398GHz. Is this correct?

Is it possible to operate DAC38RF89 with an external clock at 6.398GHz and bypass its internal PLL for the same operation?

An alternative would be to provide externally 3.199GHz and operate at interpolation x1. Is this correct?

Is it possible to use VCOH of DAC38RF89 for 2TX modes and create a superset of what we want by operating at 6.600GHz?

thanks a lot in advance

Vincenzo

over 5 years ago

0 jim s over 5 years ago

TI__Guru* 91947 points

WD_82380_12_bit_single_real_2x.pptxVincenzo,

Yes, are correct about the DAC38RF82. For the 89 device, you can operate with an external clock at 6.398GHz, as well as 1/2 this rate with 1X interpolation. You will need to operate the part in what is called Wideband DUC mode, which actually uses the DAC in a real input setting. See section 8.3.17 of the data sheet for more info. I also tested this but at a lower rate for another customer using the TI EVM. The setup for this test is attached. This should work at the higher rate as well.

Regards,

Jim

0 Marcin Paszkiewicz over 5 years ago in reply to jim s

TI__Prodigy 70 points

Jim

Just a clarification: you wrote “This should work at the higher rate as well” which means they can also use VCOH of DAC38RF89 at 6.6GHz for 2TX mode? (choosing interpolation x2 so that they don’t exceed 3.33GSPS data rate). Correct?

0 jim s over 5 years ago in reply to Marcin Paszkiewicz

TI__Guru* 91947 points

Marcin,

That is correct. 6.6GHz is the minimum the high VCO can operate at for the DAC38RF89.

Jim

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DAC38RF82: configuration check