MAX5862
High-Density Downstream Cable QAM Modulator
Low Power, Fully Integrated, Symbols-to-QAM RF Solution: 131mW/QAM in 12mm x 17mm BGA
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Overview
Features and Benefits
- Integrated Downstream Cable QAM Modulator
- High-Density: 8, 16, 24, or 32 QAM Channels
- 14-Bit 4.6Gsps RF-DAC
- DOCSIS 3.0 DRFI Compliant
- Highly Flexible and Configurable
- RRC Filters Support ITU-T J.83 Annex A, B, and C
- 1MHz to 8MHz Channel Bandwidth
- Full Carrier Agility within Each of Four 192MHz Blocks
- Block Agility within 950MHz Output Bandwidth
- Reconfigurable Without Service Interruption
- Input Symbol Rate: 1Msym/s to 7.14Msym/s
- Independently Set for Each Channel
- Integrated QAM Mapper (16/32/64/128/256-QAM)
- Supports All ITU-T J.83-Defined Constellations
- CMOS Input Port Supports Up to 1024-QAM
- Additional Features Ease RF Design
- Programmable Digital Predistortion
- High DAC Output Power 9dBm (CW) Eliminates Pre-amp
- Low Power, Compact Solution
- 4.2W at 32 (6MHz) QAMs, fS = 4.6Gsps
- 12mm x 17mm, 280-Ball FCBGA
Product Details
The MAX5862 is an integrated, high-density, downstream cable QAM modulator, digital upconverter (DUC) and RF digital-to-analog converter (RF-DAC). The device performs QAM mapping, pulse shaping and digital RF upconversion of forward-error-correction (FEC) encoded data with full agility and drives a single RF-port using a 14-bit 4.6Gsps DAC. The device digitally synthesizes RF signals with up to 32 DOCSIS-compliant 6MHz QAM or 8MHz QAM channels. The device has fixed QAM capacity and provides high-density QAM modulation with very low power dissipation (4.2W at 32 QAMs) in a compact 12mm x 17mm footprint.
The device accepts FEC-encoded CMOS data (symbols) on a single 10-bit input port that accepts up to 32 time-interleaved digital data streams. Each channel features an individually configurable QAM mapper, RRC filter, and arbitrary rate resampler (ARR). The device performs pulse shaping, resampling, interpolation and quadrature modulation of input data, supporting all data rates defined in DOCSIS 3.0 and DVB-C. A cascade of interpolation filters, complex modulators, and channel combiners allow modulation of the signal to any frequency from 47MHz to 1006MHz. Integrated direct digital frequency synthesizers allow positioning of the QAM channels with a resolution of 125Hz. The interpolation filters and resamplers provide linear phase and excellent gain flatness. Output data from the last modulator is fed to a digital-predistortion (DPD) block that can be used to correct distortion in the device’s integrated RF-DAC and output amplifiers external to the device.
Applications
- Edge QAM, CMTS, CCAP, IP-QAM
- Multi-Dweller Unit Mini-Headends
- Remote PHY, Coax Media Converters
Product Categories
Product Lifecycle
Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Evaluation Kits (1)
Documentation & Resources
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MAX5862 Reliability Data1/12/2023PDF41K
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RF Communications Product Selector Guide1/30/2020PDF6M
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MAX5861 Thermal Model Considerations3/24/2015
Tools & Simulations
Software Development
Design Resources
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