مدار مجتمع (آی سی) آی سی‌کاربرد ویژه

Product Attributes

Introduction

The MAX2101 6-bit quadrature digitizer solves one of the most challenging problems of high dynamic range digital-receiver design by combining quadrature demodulation and analog-to-digital (A/D) conversion in a single device. The MAX2101’s unique RF-to-Bits function bridges the gap between RF downconverters and CMOS digital signal processors (DSPs). The MAX2101 accepts input signals from 400MHz to 700MHz and applies gain depending on the input amplitude. The signal is then split and downconverted to baseband by two mixers, which are driven by two local oscillator (LO) signals in quadrature. An internal voltage-controlled oscillator (VCO) feeds the two LOs. Each baseband is filtered by an internal 5th-order Butterworth lowpass filter. The on-board lowpass filters have an externally variable bandwidth of 10MHz to 30MHz. Each baseband is then converted by a 6-bit analog-to-digital converter (ADC). The conversion result is stored in a register and is output using the data clock.

Features

• The MAX2101 6-bit quadrature digitizer combines quadrature demodulation with analog-to-digital conversion on a single bipolar silicon die.
• This unique RF-to-BitsTM function bridges the gap between existing RF downconverters and CMOS digital signal processors (DSPs).
• The MAX2101’s simple receiver subsystem is designed for digital communications systems.
• The MAX2101 accepts input signals from 400MHz to 700MHz and applies adjustable gain, providing at least 40dB of dynamic range.
• Each baseband is filtered by an on-chip, 5th-order Butterworth lowpass filter, or the user can select an external filter path.
• Baseband sample rate is 60Msps.
• The MAX2101 is available in a commercial temperature range, 100-pin MQFP package.
• ADCs Provide Greater than 5.5 Effective Bits at fS = 60Msps, fIN = 15MHz
• Fully Integrated Lowpass Filters with Externally Variable Bandwidth (10MHz to 30MHz)
• 40dB Dynamic Range
• Integrated VCO and Quadrature Generation Network for I/Q Demodulation
• Divide-by-16 Prescaler for Oscillator PLL
• Programmable Counter for Variable Sample Rates
• Signal-Detection Function
• Selectable Offset Binary or Twos-Complement Output Data Format
• Automatic Baseband Offset Cancellation

Applications

• Recovery of PSK and QAM Modulated RF Carriers
• Direct-Broadcast Satellite (DBS) Systems
• Television Receive-Only (TVRO) Systems
• Cable Television (CATV) Systems
• Wireless Local Area Networks (WLANs)