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BIT
WEIGHT
INPUT
SIN/COS
0
0
0
1
1
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
7
8
8
8
9
9
9
10
10
10
11
11
11
12
12
12
13
13
13
14
14
15
15
16
16
17
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
NOTES:
1. SRnd = Symmetric Round; Rnd = Round; SAT = Saturation.
2. The NBW out of the CIC filter is 0.5 x f
should be ~ 8 (9dB or 1.5 bits) versus A/D noise, the processing gain should be 10log(BW
3-27
TABLE 9B. PDC BIT WEIGHTING
CIC IN
CIC IN
MIX OUT
SHIFT = 0
SHIFT = 15
0
S
S
1
S
S
2
S
S
3
S
S
4
S
S
5
S
S
6
S
S
7
S
S
8
S
S
9
S
S
10
S
10(S)
11
S
11
12
S
12
13
S
13
14
S
14
SRnd
S
15
S
16
S
17
S
18
S
19
S
20
S
21
S
22
S
23
S
24
25(S)
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
36
36
37
37
38
38
39
39
. If the NBW
SOUT
IN
HSP50214B
CIC BIT
WEIGHTS
IIIIICCCCC
CIC OUT
HB DATA IN
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0
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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12
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13
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14
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15
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16
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17
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18
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19
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20
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21
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22
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23
xxxxx
Rnd
xxxxx
SAT
xxxxx
xxxxx
xxxxx
xxxxx
xxxxx
xxxxx
xx
xx
xx
xx
x
x
x
x
= f
/4 and NBWOUT = f
/2, then the processing gain for a decimation x 16 CIC
S
SOUT
HB DATA
FIR
OUT/FIR IN
COEF
0
0
0
1
1
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
7
8
8
8
9
9
9
10
10
10
11
11
11
12
12
12
13
13
13
14
14
14
15
15
15
16
16
16
17
17
17
18
18
18
19
19
19
20
20
20
21
21
21
22
22
23
23
Rnd
Rnd
SAT
SAT
/BW
).
IN
OUT
FIR
MULTI/
FIR
ACC
OUT
1
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
Rnd
26
SAT
27
28
29
30
31
32
(Rnd Out
of Mult.)
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