MAX2102 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX2102

Direct-Conversion Tuner ICs for Digital DBS Applications

Maxim Integrated 

Direct-Conversion Tuner ICs for

Digital DBS Applications

TRANSPONDER BW = 24MHz

0

AT SIGNAL

POINT NO. 1 dBc

DESIRED

CHANNEL

UNDESIRED ADJACENT CHANNEL

(20Msps)

-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 SIGNAL

POINT NO. 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 SIGNAL

POINT NO.3

0

dBc

-30

0

DESIRED

CHANNEL

(20Msps)

10 12

ADJ

CHANNEL

FOLDOVER

17.16 20

40

MHz

ADC NYQUIST

ADC SAMPLING

AT SIGNAL

POINT NO.4

DIGITAL MATCHED FILTER

dBc

-30

0

DESIRED

CHANNEL

(20Msps)

10 12

40

MHz

ADC SAMPLING

Figure 5. Lowpass Filtering Example. Note: Data Rate = 40Mbps, Transponder BW = 24MHz, Transponder Spacing = 29.16MHz,

Nyquist Filter: α = 0.2

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