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AD9789BBC Datasheet(PDF) 41 Page - Analog Devices

Part # AD9789BBC
Description  14-Bit, 2400 MSPS RF DAC with 4-Channel Signal Processing
PDF  76 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9789BBC Datasheet(HTML) 41 Page - Analog Devices

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AD9789
Rev. A | Page 41 of 76
–3.01dB
0dB
FREQUENCY
<0.4dB
<0.4dB
<–43dB
(1 –α)
fN
fN
(1 +α)
fN
Figure 77. SRRC Filter Characteristics
If the SRRC filter is used, at least four of the 2× interpolation
filters must be enabled. The reason for this is that the SRRC
filter requires a minimum of 12 clock cycles at the fDAC/16 rate
per sample to function properly.
Half-Band Interpolation Filters
The AD9789 can provide from 1× to 32× interpolation through
the datapath using five bypassable half-band interpolation filters.
The half-band interpolation filters are controlled via Register
0x06[4:0]. The preferred order in terms of power savings for
bypassing these filters is to bypass Filter 0 first, then Filter 1,
and so on. The frequency response of the low-pass filters is
shown in Figure 79 through Figure 82. All of the filters have a
pass band of 0.8 × fINPUT, where fINPUT is the data rate at the input
of each filter. The pass band is flat to within 0.01 dB for all
filters. The stop-band attenuation exceeds 85 dB in Filter 0,
Filter 1, and Filter 2, and 75 dB in Filter 3 and Filter 4.
2
0
1
BYPASS
REGISTER 0x06[4:0]
Figure 78. Conceptual Block Diagram of 2× Half-Band Interpolation Filters
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–2.0
–1.5
–1.0
–0.5
0
0.5
1.0
1.5
2.0
FREQUENCY ×
fINPUT (Hz)
Figure 79. 2× Half-Band Interpolation Filter 0 Response
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–2.0
–1.5
–1.0
–0.5
0
0.5
1.0
1.5
2.0
FREQUENCY ×
fINPUT (Hz)
Figure 80. 2× Half-Band Interpolation Filter 1 Response
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–2.0
–1.5
–1.0
–0.5
0
0.5
1.0
1.5
2.0
FREQUENCY ×
fINPUT (Hz)
Figure 81. 2× Half-Band Interpolation Filter 2 Response
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–1.875
–1.250
–0.625
0
0.625
1.250
1.875
FREQUENCY ×
fINPUT (Hz)
Figure 82. 2× Half-Band Interpolation Filter 3 and Filter 4 Response



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