MAX2108(1999) 查看數據表（PDF） - Maxim Integrated

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MAX2108
(Rev.:1999)

Direct-Conversion Tuner IC

Maxim Integrated 

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 = 29.16 MHz

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

40

MHz

FOR POINTS 1, 2, 3, 4, REFER TO FIGURE 1

Figure 2. Lowpass Filtering Example

ADC SAMPLING

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