MAX2108 데이터 시트보기 (PDF) - Maxim Integrated
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MAX2108 Datasheet PDF : 12 Pages
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Direct-Conversion Tuner IC
TRANSPONDER BW = 24MHz
0
AT POINT
dBc
1
DESIRED
CHANNEL
(20Msps)
UNDESIRED ADJACENT CHANNEL
-30
0
10 12 17.16 20
29.16
40 41.16
MHz
DATA NYQUIST
α = 0.2
NYQUIST FOR ADC
ADC SAMPLING
TRANSPONDER SPACING = 29.16MHz
AT POINT
2
0
dBc
-30
0
LOWPASS FILTER RESPONSE
DESIRED
CHANNEL
(20Msps)
10 12 17.16 20
28
40
MHz
PASSBAND FILTER REQUIREMENTS:
(1) <20% OF BAUD PERIOD DELAY RIPPLE
(2) <0.1dB GAIN RIPPLE
TRANSITION BAND FILTER REQUIREMENTS:
< 2dB GAIN RIPPLE
FILTER CUTOFF
ADC SAMPLING
AT POINT
3
0
dBc
-30
0
DESIRED
CHANNEL
(20Msps)
10 12
ADJ
CHANNEL
FOLDOVER
17.16 20
40
MHz
ADC NYQUIST
ADC SAMPLING
AT POINT
4
DIGITAL MATCHED FILTER
dBc
-30
0
DESIRED
CHANNEL
(20Msps)
10 12
FOR POINTS 1, 2, 3, 4, REFER TO FIGURE 1
40
MHz
ADC SAMPLING
Figure 2. Lowpass Filtering Example
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