Rainbow-electronics MAX1003 Manual de usuario descargar pdf (Pagina 6)

MAX1003

Single-ended and differential AC-coupled input circuits

are shown in Figures 2 and 3. 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 will determine the low-frequency corner of the ana-

log input response according to the following formula:

= 1 / (0.1 x C)

where C is the value of the compensation capacitor in

µF, and f

is the corner frequency in Hz.

Low-Power, 90Msps, Dual 6-Bit ADC

6 _______________________________________________________________________________________

DIV

90Msps

DATA

BUFFER

TANK

MODCTL CAR

SYNTHESIZER

FIN

IIN

AGC

CLK IN

DSP

QIN

ADC CLOCK

6 BITS

TANK

TSA5055

or EQUIV.

MOD GND

AGC

IOUT

QOUT

FROM TANK VOLTAGE

VARACTOR-TUNED

PRESELECTION FILTER

EXTERNAL

VCO

KU BAND

75Ω CABLE

950MHz TO 2150MHz

F-CONNECTOR

INPUT

MAX2102

MAX1003

DATA

BUFFER

RFIN

LNB

6 BITS

Figure 1. Commercial Satellite Receiver System

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

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Rainbow-electronics MAX1003 Manual de usuario Pagina 6

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