AD6622AS Analog Devices Inc, AD6622AS Datasheet - Page 15

• Manufacturer Part Number: AD6622AS
• Manufacturer: Analog Devices Inc

Specifications of AD6622AS

• Lead Free Status / RoHS Status: Not Compliant

The CIC2 rejects each of the undesired images while passing
the image at baseband. The images of a pure tone at channel
center (dc) are nulled perfectly, but as the bandwidth increases
the rejection is diminished. The lower band edge of the first
image always has the least rejection. In this example, the CIC2
is interpolating by a factor of five and the input signal has a band-
width of 0.0033 of the CIC5 output sample rate. Figure 17
shows –110 dBc rejection of the lower band edge of the first
image. All other image frequencies have better rejection.
–110
–130
–150
–110
–130
–150
–10
–30
–50
–70
–90
–10
–30
–50
–70
–90
10
10
–2
–2
–1
–1
0
0
1
1
2
2
Table IV lists maximum bandwidth that will be rejected to various
levels for CIC2 interpolation factors from 1 to 32. The example
above corresponds to the listing in the –110 dB column and
the L
CIC2 improves as the interpolation factor increases.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
CIC2
–110 dB
Full
0.0023
0.0029
0.0032
0.0033
0.0034
0.0034
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
0.0035
= 5 row. It is worth noting that the rejection of the
Table IV. CIC2 Alias Protection
–100 dB
Full
0.0040
0.0052
0.0057
0.0059
0.0060
0.0061
0.0062
0.0062
0.0062
0.0062
0.0062
0.0062
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
0.0063
–90 dB
Full
0.0072
0.0093
0.0101
0.0105
0.0107
0.0108
0.0109
0.0110
0.0110
0.0110
0.0111
0.0111
0.0111
0.0111
0.0111
0.0111
0.0111
0.0111
0.0111
0.0111
0.0111
0.0111
0.0112
0.0112
0.0112
0.0112
0.0112
0.0112
0.0112
0.0112
0.0112
–80 dB
Full
0.0127
0.0165
0.0179
0.0186
0.0189
0.0192
0.0193
0.0194
0.0195
0.0195
0.0196
0.0196
0.0196
0.0197
0.0197
0.0197
0.0197
0.0197
0.0197
0.0197
0.0197
0.0197
0.0197
0.0198
0.0198
0.0198
0.0198
0.0198
0.0198
0.0198
0.0198
AD6622
–70 dB
Full
0.0226
0.0292
0.0316
0.0328
0.0334
0.0338
0.0341
0.0343
0.0344
0.0345
0.0346
0.0346
0.0347
0.0347
0.0347
0.0348
0.0348
0.0348
0.0348
0.0348
0.0348
0.0348
0.0348
0.0349
0.0349
0.0349
0.0349
0.0349
0.0349
0.0349
0.0349