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DOCSIS 3.1 High-Density SCQAM and OFDM Downstream Cable Modulator

Low Power, Fully Integrated, Symbols to RF Solution: 7mW/MHz in a 12mm X 18mm BGA

Product Details

Key Features

Parametric specs for Modulators and Digital Upconverters
Resolution (bits) 14
Update Rate (Msps) 4915
Modulation Mode OFDM
SCQAM
Capacity Range 160
Capacity Type Fixed
Input Interface LVDS
SSTL
Output Interface Differential Analog RF
fOUT (MHz) 1218
RF-DAC Integrated
PDISS (mW) (@ Max Capacity) 5900
VSUPPLY (V) 0.9
1.8
3.3
Footprint (mm x mm) 12 x 18
Oper. Temp. (°C) -40 to +85
Package/Pins FCCSP HYBRID/308
Budgetary
Price (See Notes)
0
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Simplified Block Diagram

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Parameters

Parametric specs for Modulators and Digital Upconverters
Resolution (bits) 14
Update Rate (Msps) 4915
Modulation Mode OFDM
SCQAM
Capacity Range 160
Capacity Type Fixed
Input Interface LVDS
SSTL
Output Interface Differential Analog RF
fOUT (MHz) 1218
RF-DAC Integrated
PDISS (mW) (@ Max Capacity) 5900
VSUPPLY (V) 0.9
1.8
3.3
Footprint (mm x mm) 12 x 18
Oper. Temp. (°C) -40 to +85
Package/Pins FCCSP HYBRID/308
Budgetary
Price (See Notes)
0

Key Features

  • High-Density Cable Downstream Modulator
    • Combine Up to Six 192MHz Blocks of 32 x 6MHz SCQAM Channels and DOCSIS 3.1 OFDM Channels
    • Integrated 14-Bit 4.9152Gsps RF-DAC
  • Highly Flexible and Configurable
    • ITU-T J.83 Annex A, B, and C SCQAM Channels
    • IFFT Processing D3.1 OFDM Channels
    • LVDS or SSTL 1.2/1.5 DDR Data Ports
    • One 10-Bit SCQAM Port with 160-Channel Capacity
    • Two 9-Bit OFDM Ports with 6 OFDM-Channel Capacity
    • Channel Bandwidths:
    • 1MHz to 8MHz SCQAM
    • 24MHz/48MHz/96MHz/192MHz OFDM
    • 192MHz IFFT Bypass Mode
    • Full SCQAM Agility within 192MHz Block
    • Block Agility within 1218MHz Output Bandwidth
  • Additional Features Ease RF Design
    • Programmable Digital Predistortion
    • High Output Power: 9dBm (Peak CW)
  • Low-Power, Compact Solution
    • 5.9W with 128 SCQAMs + 2 OFDM Channels
    • Operating Temperature Range TA = -40°C to TJ = +110°C
    • 12mm x 18mm, 308-Ball LFBGA

Applications/Uses

  • CCAP, Edge QAM, CMTS
  • DOCSIS 3.0/3.1 and DVB-C/C2
  • Multi-Dweller Units (MDU), Mini-Headends
  • Remote PHY, Coax Media Converters

Description

The MAX5861 is an integrated, high-density, SCQAM and OFDM downstream cable modulator, digital up-converter (DUC) and RF digital-to-analog converter (RF-DAC). The MAX5861 is DOCSIS 3.1-compliant and is optimized for converged cable access platform (CCAP) hardware. The MAX5861 performs baseband I/Q symbols to RF up-conversion to digitally synthesize a selectable combination of SCQAM and OFDM blocks on a single RF port. A combination of up to six 192MHz blocks of SCQAM or OFDM channels can be powered on at any one time, where a block is defined as either 32 X 6MHz (or 24 X 8MHz) SCQAM channels or an OFDM channel (up to 192MHz wide). The MAX5861 features three differential time-multiplexed input data ports that support LVDS or SSTL 1.2/1.5 in DDR mode.

The MAX5861 SCQAM input port A accepts 10-bit Forward Error Correction (FEC)-encoded data for up to 160 (6MHz) individually programmable channels. The SCQAM path performs QAM mapping, root raised cosine (RRC) pulse shaping, and resampling, compliant with ITU-T J.83 Annex A, B, and C. This port also supports 1024-QAM with the use of an offset bias bit. Up to four channels can be operated in RRC filter bypass mode at up to 2.5Msym/s for legacy communications to older generation devices.

Each of two available 9-bit OFDM ports, B or C, support up to three 12-bit OFDM IFFT-processing channels. Each IFFT-processing channel supports OFDM blocks of up to 192MHz bandwidth with selectable 4k or 8k subcarriers and up to 4096-QAM modulation options. Each of the two OFDM ports also allow bypassing of the IFFT processing with a single 18-bit I/Q data path to support user-defined modulation at up to 192MHz bandwidth.

A cascade of interpolation filters, complex modulators, channel combiners and Direct Digital Frequency Synthesizers (DDFS) up-convert the SCQAM and/or OFDM signals with full frequency agility from 43MHz to 1218MHz. The up-converted spectrum is fed to a Digital Pre-Distortion (DPD) block to compensate for distortion performance limitations in the DAC and external output amplifiers.

Simplified Block Diagram

MAX5861: Simplified Block Diagram MAX5861: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .