AD9122 Analog Devices, AD9122 Datasheet - Page 37

• 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

Figure 52 shows the pass-band filter response for HB1. 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 16 shows the pass-band flatness
and stop-band rejection supported by the HB1 filter at different
bandwidths.
Table 16. HB1 Pass-Band and Stop-Band Performance by
Bandwidth
Bandwidth (% of f
80
80.4
81.2
82
83.6
85.6
–0.02
–0.04
–0.06
–0.08
–0.10
0.02
0
0
0.04
Figure 52. Pass-Band Detail of HB1
0.08
IN1
)
0.12
FREQUENCY (×
0.16
Pass-Band
Flatness (dB)
0.001
0.0012
0.0033
0.0076
0.0271
0.1096
0.20
0.24
f
IN1
) (Hz)
0.28
0.32
Stop-Band
Rejection (dB)
85
80
70
60
50
40
0.36
0
.
40
Rev. B | Page 37 of 60
Half-Band Filter 2 (HB2)
HB2 has eight modes of operation, as shown in Figure 53 and
Figure 54. The shape of the filter response is identical in each of
the eight modes. The eight modes are distinguished by two factors:
the filter center frequency and whether the input signal is
modulated by the filter.
As shown in Figure 53 and Figure 54, the center frequency in
each mode is offset by one-fourth the input data rate (f
the filter. Mode 0 through Mode 3 do not modulate the input
signal. Mode 4 through Mode 7 modulate the input signal by
f
operate independently and no mixing of the data between chan-
nels occurs. When operating in the other six modes, mixing of
the data between the I and Q paths occurs; therefore, the data
input to the filter is assumed to be complex.
IN2
. When operating in Mode 0 and Mode 4, the I and Q paths
–100
–100
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
MODE 0
0.2
0.2
MODE 1
0.4
Figure 53. HB2, Even Filter Modes
0.4
Figure 54. HB2, Odd Filter Modes
0.6
0.6
MODE 2
FREQUENCY (×
FREQUENCY (×
0.8
0.8
MODE 3
1.0
1.0
MODE 4
f
f
IN2
IN2
1.2
1.2
MODE 5
) (Hz)
) (Hz)
1.4
1.4
MODE 7
1.6
1.6
MODE 6
1.8
1.8
AD9122
IN2
2
2
) of
.0
.0