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AD9786BSVRL Datasheet(PDF) 36 Page - Analog Devices

Part # AD9786BSVRL
Description  16-Bit, 200 MSPS/500 MSPS TxDAC
PDF  56 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9786BSVRL Datasheet(HTML) 36 Page - Analog Devices

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AD9786
Rev. B | Page 36 of 56
Table 33. Dual-Channel Complex Modulation
MODDUAL
CHANNEL
MOD[1]
MOD[0]
Mode
0
0
0
0
Real output, no modulation
0
0
0
1
Real output, modulation by fDAC/2
0
0
1
0
Real output, modulation fDAC/4
0
0
1
1
Real output, modulation fDAC/8
0
1
0
0
Image output, no modulation
0
1
0
1
Image output, modulation by fDAC/2
0
1
1
0
Image output, modulation by fDAC/4
0
1
1
1
Image output, modulation by fDAC/8
In dual-channel mode, the two channels can be modulated by
a complex signal, with either the real or imaginary modulation
result directed to the DAC. Assume initially, as in Figure 63,
that the complex modulating signal is defined for a positive
frequency only. This causes the output spectrum to be trans-
lated in frequency by the modulation factor only. No additional
sidebands are created as a result of the modulation process;
therefore, the bandwidth to the first image from the baseband
bandwidth is the same as the output of the interpolation filters.
Furthermore, pass bands do not overlap or touch. The sinc
shaping at the corners of the modulated signal band is tabulated
in Table 34. Figure 64, Figure 65, and Figure 66 show the effects
of complex modulation with varying interpolation rates.
Table 34. Complex Modulated Pass-Band Edges Sinc Shaping
(Lower/Upper)
Interpolation
Modulation
None
×2
×4
×8
None
0
0
0
0
–2.8241
–0.6708
–0.1657
–0.0413
fDAC/2
–0.0701
–1.1932
–2.3248
–3.0590
–22.5378
–9.1824
–6.1190
–4.9337
fDAC/4
–0.4680
–0.0175
–0.2921
–0.5974
–6.0630
–3.3447
–1.9096
–1.3607
fDAC/8
–1.3723
–0.1160
–0.0044
–0.0727
–4.9592
–1.7195
–0.7866
–0.4614
FILTERED INTERPOLATION IMAGES
fS/8 MODULATION
NO NEGATIVE
SIDEBAND
Figure 63. Complex Modulation



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