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AD9121 Datasheet(PDF) 39 Page - Analog Devices

Part # AD9121
Description  TxDAC Digital-to-Analog Converter
PDF  61 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9121 Datasheet(HTML) 39 Page - Analog Devices

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AD9121
Data Sheet
Rev. B | Page 38 of 60
Table 17 summarizes the HB2 and HB3 modes.
Table 17. HB2 and HB3 Filter Modes
Mode
fCENTER
fMOD
Input Data
0
DC
None
Real or complex
1
fIN/4
None
Complex
2
fIN/2
None
Complex
3
3fIN/4
None
Complex
4
fIN
fIN
Real or complex
5
5fIN/4
fIN
Complex
6
3fIN/2
fIN
Complex
7
7fIN/4
fIN
Complex
Figure 54 shows the pass-band filter response for HB2. In most
applications, the usable bandwidth of the filter is limited by the
image suppression provided by the stop-band rejection and not
by the pass-band flatness. Table 18 shows the pass-band flatness
and stop-band rejection supported by the HB2 filter at different
bandwidths.
0.02
0
–0.02
–0.04
–0.06
–0.08
–0.10
0
0.32
0.28
0.24
0.20
0.16
0.12
0.08
0.04
FREQUENCY (×
fIN2) (Hz)
Figure 54. Pass-Band Detail of HB2
Table 18. HB2 Pass-Band and Stop-Band Performance by
Bandwidth
Bandwidth (% of fIN2)
Pass-Band
Flatness (dB)
Stop-Band
Rejection (dB)
50
0.001
85
50.8
0.0012
80
52.8
0.0028
70
56
0.0089
60
60
0.0287
50
64.8
0.1877
40
Half-Band Filter3(HB3)
HB3 has eight modes of operation that function the same as
HB2. The primary difference between HB2 and HB3 is the
filter bandwidths.
Figure 55 shows the pass-band filter response for HB3. In most
applications, the usable bandwidth of the filter is limited by the
image suppression provided by the stop-band rejection and not
by the pass-band flatness. Table 19 shows the pass-band flatness
and stop-band rejection supported by the HB3 filter at different
bandwidths.
0.02
–0.10
–0.08
–0.06
–0.04
–0.02
0
0
0.28
0.24
0.20
0.16
0.12
0.08
0.04
FREQUENCY (×
fIN3) (Hz)
Figure 55. Pass-Band Detail of HB3
Table 19. HB3 Pass-Band and Stop-Band Performance by
Bandwidth
Bandwidth (% of fIN3)
Pass-Band
Flatness (dB)
Stop-Band
Rejection (dB)
40
0.001
85
40.8
0.0014
80
42.4
0.002
70
45.6
0.0093
60
49.8
0.03
50
55.6
0.1
40



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