AD9122 Analog Devices, AD9122 Datasheet - Page 38

• Manufacturer Part Number: AD9122
• Manufacturer: Analog Devices

Specifications of AD9122

• Resolution (bits): 16bit
• Dac Update Rate: 1.23GSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: LVDS,Par

AD9122
Table 17 summarizes the HB2 and HB3 modes.
Table 17. HB2 and HB3 Filter Modes
Mode
0
1
2
3
4
5
6
7
Figure 55 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.
Table 18. HB2 Pass-Band and Stop-Band Performance by
Bandwidth
Bandwidth (% of f
50
50.8
52.8
56
60
64.8
–0.02
–0.04
–0.06
–0.08
–0.10
0.02
0
0
f
DC
f
f
3f
f
5f
3f
7f
IN
IN
IN
CENTER
0.04
IN
IN
IN
IN
/4
/2
/4
/4
/2
/4
Figure 55. Pass-Band Detail of HB2
IN2
0.08
)
FREQUENCY (×
0.12
f
None
None
None
None
f
f
f
f
Pass-Band
Flatness (dB)
0.001
0.0012
0.0028
0.0089
0.0287
0.1877
IN
IN
IN
IN
MOD
0.16
f
0.20
IN2
Input Data
Real or complex
Complex
Complex
Complex
Real or complex
Complex
Complex
Complex
) (Hz)
0.24
Stop-Band
Rejection (dB)
85
80
70
60
50
40
0.28
0
.32
Rev. B | Page 38 of 60
Half-Band Filter 3 (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 56 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.
Table 19. HB3 Pass-Band and Stop-Band Performance by
Bandwidth
Bandwidth (% of f
40
40.8
42.4
45.6
49.8
55.6
–0.02
–0.04
–0.06
–0.08
–0.10
0.02
0
0
0.04
Figure 56. Pass-Band Detail of HB3
IN3
)
0.08
FREQUENCY (×
Pass-Band
Flatness (dB)
0.001
0.0014
0.002
0.0093
0.03
0.1
0.12
0.16
f
IN3
) (Hz)
0.20
Stop-Band
Rejection (dB)
85
80
70
60
50
40
0.24
0
.28