MAX2108 데이터 시트보기 (PDF) - Maxim Integrated
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MAX2108 Datasheet PDF : 12 Pages
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Direct-Conversion Tuner IC
Power-Supply Sequencing
The MAX2108 has several +5V supply pins. Configure
the supply layout in a star format, with a bypass capac-
itor that dominates the rise time of the supply at the
center of the star to ensure that all pins see approxi-
mately the same voltage during power-up.
Filters in Direct-Conversion Tuners
Typically, a 5th- or 7th-order L-C lowpass filter is used
for anti-aliasing the ADCs following the MAX2108.
Table 1 offers suggested component values for these
lowpass filters. Figures 1 and 2 describe typical filtering
requirements.
Table 1. Suggested Component Values for Discrete Lowpass Filters
ADC
SAMPLING
RATE
(Msps)
40
60
90
FILTER TYPE
0.1dB Chebyshev,
fC = 20MHz
0.1dB Chebyshev,
fC = 30MHz
0.1dB Chebyshev,
fC = 20MHz
0.1dB Chebyshev,
fC = 45MHz
RS
C1
L1
C2
L2
C3
L3
C4
RL
(Ω)
(pF) (nH) (pF) (nH) (pF) (nH) (pF) (kΩ)
50
20
910
60
1500
75
1500
60
20
50
11
620
41
910
50
1000
41
20
50
15
680
39
820
33
Short Open
20
50
9
390
28
620
34
680
28
20
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