MAX5861

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


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说明

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.

关键特性

  • 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

应用

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  • 远端PHY、同轴媒体转换器
Part NumberResolution
(bits)
Update Rate
(Msps)
Modulation ModeCapacity RangeCapacity TypeInput InterfaceOutput InterfacefOUT
(MHz)
RF-DACPDISS
(mW)
VSUPPLY
(V)
Footprint
(mm x mm)
Oper. Temp.
(°C)
Package/Pins
@ Max Capacity
MAX5861 144915
OFDM
SCQAM
160
6x192MHz
Fixed
LVDS
SSTL
Differential Analog RF1218Integrated5900
0.9
1.8
3.3
12 x 18-40 to +85
FCBGA HYBRID/280
FCCSP HYBRID/308
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Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。


MAX5861EVKIT: Evaluation Kit for the MAX5861

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相关资料


MAX5861
DOCSIS 3.1 High-Density SCQAM and OFDM Downstream Cable Modulator

  • High-Density Cable Downstream Modulator
  • Highly Flexible and Configurable
  • Additional Features Ease RF Design


类型 编号 标题
评估板10114MAX5861EVKIT Evaluation Kit for the MAX5861