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DAC39J84IAAVR Datasheet(PDF) 61 Page - Texas Instruments

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Part # DAC39J84IAAVR
Description  DAC39J84 Quad-Channel, 16-Bit, 2.8 GSPS, Digital-to-Analog Converter with 12.5 Gbps JESD204B Interface
PDF  146 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

DAC39J84IAAVR Datasheet(HTML) 61 Page - Texas Instruments

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PLL VCO Coars Tuning Bits
0
8
16
24
32
40
48
56
64
3500
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000
High Band VCO
Low Band VCO
DAC39J84
www.ti.com
SLASE48A – NOVEMBER 2014 – REVISED JANUARY 2015
Device Functional Modes (continued)
Figure 80. Typical PLL VCO Center Frequency vs Coarse Tuning Bits
Common wireless infrastructure frequencies are generated from this VCO frequency in conjunction with the pre-
scaler setting pll_p in register config50 as shown in Table 28. When there are multiple valid VCO frequency and
the pre-scaler settings to generate the same desired DACCLK frequency, higher pre-scaler divider ratio is
recommended for better phase noise performance.
Table 28. VCO Operation
VCO FREQUENCY (MHz)
pll_vcosel
PRE-SCALE DIVIDER
DESIRED DACCLK (MHz)
pll_p(3:0)
4915.2
0
2
2457.6
0000
3932.16
1
2
1966.08
0000
4423.68
1
3
1474.56
0001
4915.2
0
4
1228.8
0010
4915.2
0
5
983.04
0011
5160.96
0
7
737.28
0101
4915.2
0
8
614.4
0110
4915.2
0
10
491.52
0111
Copyright © 2014–2015, Texas Instruments Incorporated
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