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DAC38RF80 Datasheet(PDF) 61 Page - Texas Instruments

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Part # DAC38RF80
Description  Dual- or Single-Channel, Single-Ended or Differential Output, 14-Bit, 9-GSPS, RF-Sampling DAC With JESD204B Interface and On-Chip PLL
PDF  155 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DAC38RF80 Datasheet(HTML) 61 Page - Texas Instruments

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16
16
16
16
xN
xN
xN
xN
x
sin(x)
48-bit
NCO2
cos
sin
48-bit
NCO1
cos
sin
CMIX control
(±n*Fs/4)
Input
Mux
Multiband
summation
x
sin(x)
PAP
Gain
PAP
Gain
From 2nd
multi-DUC
Delay
I
Q
I
Q
Path AB
Path CD
61
DAC38RF80, DAC38RF83, DAC38RF84
DAC38RF85, DAC38RF90, DAC38RF93
www.ti.com
SLASEA3C – DECEMBER 2016 – REVISED JULY 2017
DAC38RF83 DAC38RF93
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Figure 57. DAC38RFxx multi-DUC Signal Processing Block Diagram
8.3.17.1 Multi-DUC input
Each multi-DUC, accepts data from up to 8 SerDes lanes. A crossbar switch allows any SerDes lane to be
mapped to any other SerDes lane. The crossbar switch is controlled by fields OCTETPATHx_SEL (x = [0..7]) in
Registers JESD_CROSSBAR1 (8.5.57) and JESD_CROSSBAR2 (8.5.58).
As shown in Table 9, the multiband DUC can be configured as either a single DUC with 1 IQ input, or a dual
DUC with 2 IQ inputs, which is selected by asserting field DUAL_IQ in register MULTIDUC_CFG1 (8.5.13).
8.3.17.2 Interpolation Filters
The digital upconverter first increases the sample rate of the IQ signal from the input sample rate to the final
DAC sample rate through a series of interpolation filters. Different sets of filters are used to achieve different
rates, as shown in Table 34. The interpolation rate is selected by field INTERP in register MULTIDUC_CFG1
(8.5.13).
Table 34. FIR filters Used for Different Interpolation Rates
FILTERS USED
Interpolation
Rate
FIR0 (2x)
FIR1 (2x)
LPFIR0_5X
FIR2 (2x)
LPFIR0_3X
FIR3 (2x)
LPFIR1_3X
6
x
x
8
x
x
x
10
x
x
12
x
x
x
16
x
x
x
x
18
x
x
x
20
x
x
x
24
x
x
x
x



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