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AD9684 View Datasheet(PDF) - Analog Devices

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AD9684 Datasheet PDF : 64 Pages
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AD9684
HALF-BAND FILTERS
0
The AD9684 offers four half-band filters to enable digital signal
processing of the ADC converted data. These half-band filters
are bypassable and can be individually selected.
HB4 Filter
The first decimate by 2, half-band, low-pass FIR filter (HB4)
uses an 15-bit, symmetrical, fixed coefficient filter implementation
that is optimized for low power consumption. The HB4 filter is
used only when complex outputs (decimate by 16) or real outputs
(decimate by 8) are enabled; otherwise, the filter is bypassed.
Table 18 and Figure 62 show the coefficients and response of
the HB4 filter.
Table 18. HB4 Filter Coefficients
HB4 Coefficient Number Decimal Coefficient (15-Bit)
C1, C11
99
C2, C10
0
C3, C9
−808
C4, C8
0
C5, C7
4805
C6
8192
0
–20
–20
–40
–60
–80
–100
–120
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
NORMALIZED FREQUENCY (× π RAD/SAMPLE)
Figure 63. HB3 Filter Response
HB2 Filter
The third decimate by 2, half-band, low-pass FIR filter (HB2)
uses a 19-bit, symmetrical, fixed coefficient filter implementation
that is optimized for low power consumption. The HB2 filter is
only used when complex outputs (decimate by 4, 8, or 16) or
real outputs (decimate by 2, 4, or 8) are enabled; otherwise, the
filter is bypassed.
Table 20 and Figure 64 show the coefficients and response of
the HB2 filter.
–40
–60
–80
–100
–120
0
HB3 Filter
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
NORMALIZED FREQUENCY (× π RAD/SAMPLE)
Figure 62. HB4 Filter Response
Table 20. HB2 Filter Coefficients
HB2 Coefficient Number Decimal Coefficient (19-Bit)
C1, C19
161
C2, C18
0
C3, C17
−1328
C4, C16
0
C5, C15
5814
C6, C14
0
C7, C13
−19272
C8, C12
0
C9, C11
80,160
C10
131,072
The second decimate by 2, half-band, low-pass, FIR filter (HB3)
0
uses an 18-bit, symmetrical, fixed coefficient filter implementation
that is optimized for low power consumption. The HB3 filter is
–20
only used when complex outputs (decimate by 8 or 16) or real
–40
outputs (decimate by 4 or 8) are enabled; otherwise, the filter is
bypassed. Table 19 and Figure 63 show the coefficients and
–60
response of the HB3 filter.
–80
Table 19. HB3 Filter Coefficients
HB3 Coefficient Number Decimal Coefficient (18-Bit)
–100
C1, C11
859
C2, C10
0
–120
C3, C9
−6661
0
C4, C8
0
C5, C7
38570
C6
65536
Rev. 0 | Page 41 of 64
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
NORMALIZED FREQUENCY (× π RAD/SAMPLE)
Figure 64. HB2 Filter Response
 

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