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AD6684 Datasheet(PDF) 43 Page - Analog Devices

Part # AD6684
Description  135 MHz Quad IF Receiver
PDF  107 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD6684 Datasheet(HTML) 43 Page - Analog Devices

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Data Sheet
AD6684
Rev. 0 | Page 43 of 107
–180
–100
–60
–40
–20
–160
–140
–120
–80
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
NORMALIZED FREQUENCY (×
RAD/SAMPLE)
Figure 79. HB2 Filter Response
HB1 Filter
The fourth and final decimate by 2, half-band, low-pass, FIR
filter (HB1) uses a 63-tap, symmetrical, fixed coefficient filter
implementation that is optimized for low power consumption.
The HB1 filter is always enabled and cannot be bypassed.
Table 21 and Figure 80 show the coefficients and response of
the HB1 filter.
–100
–60
–40
–20
–160
–140
–120
–80
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
NORMALIZED FREQUENCY (×
RAD/SAMPLE)
Figure 80. HB1 Filter Response
Table 21. HB1 Filter Coefficients
HB1 Coefficient
Number
Decimal
Coefficient
Quantized
Coefficient (20-Bit)
C1, C63
−0.000019
−10
C2, C62
0
0
C3, C61
0.000072
38
C4, C60
0
0
C5, C59
−0.000194
−102
C6, C58
0
0
C7, C57
0.000442
232
C8, C56
0
0
C9, C55
−0.000891
−467
C10, C54
0
0
C11, C53
0.001644
862
C12, C52
0
0
C13, C51
−0.002840
−1,489
C14, C50
0
0
C15, C49
0.004653
2,440
C16, C48
0
0
C17, C47
−0.007311
−3,833
C18, C46
0
0
C19, C45
0.011121
5,831
C20, C44
0
0
C21, C43
−0.016553
−8,679
C22, C42
0
0
C23, C41
0.024420
12,803
C24, C40
0
0
C25, C39
−0.036404
−19,086
C26, C38
0
0
C27, C37
0.056866
29,814
C28, C36
0
0
C29, C35
−0.101892
−53,421
C30, C34
0
0
C31, C33
0.316883
166,138
C32
0.500000
262,144



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