MAX2102 データシートの表示（PDF） - Maxim Integrated

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MAX2102

Direct-Conversion Tuner ICs for Digital DBS Applications

Maxim Integrated 

Direct-Conversion Tuner ICs for

Digital DBS Applications

Power-Supply Sequencing

The MAX2102/MAX2105 have several +5V supply pins.

The supply layout should be in a star format, with a

bypass capacitor that dominates the rise time of the

supply at the center of the star, to ensure that all pins

see approximately the same voltage during power-up.

The prescaler VCC (pin 28) must be connected to the

same VCC as the other VCC pins, even if the prescaler

is not used. Leaving PSGND open will disable the

prescaler function and, in this state, the prescaler will

not dissipate any power.

Systems Consideration: Lowpass Filters in

Direct-Conversion Tuners

Typically, a 5th or 7th-order L-C lowpass filter is used

for anti-aliasing the ADCs following the MAX2102.

Figures 4 and 5 describe typical filtering requirements.

Table 1 offers suggested component values for these

lowpass filters.

Chip Information

TRANSISTOR COUNT: 1852

SUBSTRATE CONNECTED TO GND

I

MAX2102

ANALOG LP FILTERS

ADCs

MAX2105

Q

MATCHED FILTERS

“1”

“2”

DIGITAL SIGNAL PROCESSING

“3”

“4”

Figure 4. I, Q Signal Path

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