Rainbow-electronics MAX1002 Manuel d'utilisateur télécharger pdf (Page 6)

MAX1002

Figures 2 and 3 show single-ended and differential AC-

coupled input circuits. Each of the amplifier inputs is

internally biased to a 2.35V reference through a 20kΩ

resistor, eliminating external DC bias circuits. A series

0.1µF capacitor is required at each amplifier input for

AC-coupled signals.

When operating with AC-coupled inputs, the input

amplifiers’ DC offset voltage is nulled to within ±1/2LSB

by an on-chip offset-correction amplifier. An external

compensation capacitor is required to set the dominant

pole of the offset-correction amplifier’s frequency

response (Figures 2 and 3). The compensation capaci-

tor determines the low-frequency corner of the analog

input response according to the following formula:

= 1 / (0.1 x C)

where C is the value of the compensation capacitor in

µF, and fc is the corner frequency in Hz.

Low-Power, 60Msps, Dual, 6-Bit ADC

6 _______________________________________________________________________________________

DIV

60Msps

DATA

BUFFER

TANK

MODCTL CAR

SYNTHESIZER

FIN

IIN

AGC

CLK IN

DSP

QIN

DAC OR

ADC CLOCK

6 BITS

TANK

TSA5055 or

EQUIVALENT

OFFSET CORRECTION

OFFI

OFFQ

PSOUT MOD GND (x8)

AGC

IOUT

QOUT

(x7)

FROM TANK VOLTAGE

VARACTOR-TUNED

PRESELECTION FILTER

EXTERNAL

VCO

F-CONNECTOR

FOR 2ND SET-TOP BOX

KU BAND

75Ω CABLE

950MHz TO 2150MHz

F-CONNECTOR

INPUT

MAX2102

MAX1002

DATA

BUFFER

6 BITS

RFIN

LNB

Figure 1. Commercial Satellite Receiver System

1 2 3 4 5 6 7 8 9 10 11 12

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Rainbow-electronics MAX1002 Manuel d'utilisateur Page 6

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