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14-Bit, 4.6Gsps Cable Downstream Direct RF Synthesis DAC

RF-DAC Enables Fully Digital Upconverter for DOCSIS 3.0-Compliant Edge QAM Devices, CMTS, and CCAP

Product Details

The MAX5882 14-bit, 4.6Gsps digital-to-analog converter (DAC) is designed for direct RF synthesis of multicarrier quadrature amplitude modulation (QAM) signals in cable modem termination systems (CMTS) and edge QAM (EQAM) devices. The DAC features excellent spurious, noise, and adjacent-channel power (ACP) performance, and directly synthesizes multiple carriers in the 47MHz to 1003MHz cable downstream band, as defined by the Data-Over-Cable Service Interface Specification (DOCSIS®). The 4.6Gsps update rate allows digital generation of signals with more than 2GHz bandwidth.

The device has four 14-bit, multiplexed, low-voltage differential signaling (LVDS) input ports that each operate at up to 1150Mwps in double data rate (DDR) or single data rate (SDR) mode. The inputs also accept differential high-speed transceiver logic (DHSTL) input levels. The device accepts a clock at 1/2 the DAC update rate, as conversion is triggered on both rising and falling clock edges. The input data rate on each port is 1/4 the DAC update rate or 1/2 of the clock rate. The device contains a delay-locked loop (DLL) that simplifies the interface to FPGA or ASIC devices. Using the DLL, the phase of the output clock (DATACLK) is adjusted to ensure that the input LVDS data bus has the proper timing relationship to the on-chip clock used to latch the data.

The device is a current-steering DAC with an integrated 50Ω differential output termination to ensure optimum dynamic performance. Operating from 3.3V and 1.8V power supplies, the device consumes 2.3W at 4.6Gsps. The device is specified over the upper commercial temperature range (0°C to +85°C) and is offered in a 256 CSBGA lead(Pb)-free/RoHS-compliant package.

Key Features

  • 4.6Gsps Output Update Rate
    • Direct RF Synthesis from 47MHz to 1003MHz
    • No Aliasing of HD3 into Cable Band
  • Industry-Leading DOCSIS 3.0 Performance Noise Floor
    • -70dBc at fOUT = 900MHz, 8 Channel (256 QAM)
    • -66dBc at fOUT = 900MHz, 16 Channel (256 QAM)
    • -62dBc at fOUT = 900MHz, 32 Channel (256 QAM)
    • -57dBc at fOUT = 500MHz, 128 Channel (256 QAM)
  • High Output Power 9dBm (CW)
    • Enables Low Solution Power
  • 4:1 Multiplexed LVDS Inputs
    • Up to 1150Mwps Each Port
    • Double Data Rate (DDR) Mode
  • On-Chip DLL for Input Data Synchronization
  • Parity Error Flag
  • Internal 50Ω Differential Output Termination
  • Input Register Scan Mode
  • Compact 17mm × 17mm, 256 CSBGA Package
  • Evaluation Kit Available (Order MAX5882EVKIT+)

Applications/Uses

  • Broadcast Video Modulators
  • Cable Modem Termination Systems (CMTS)
  • DOCSIS-Compliant Edge QAM Devices
  • Video-on-Demand (VOD)
Parametric specs for High-Speed DACs (≥ 1MHz)
Resolution (bits) 14
# Channels 1
fCLK (Msps) 4600
IOUT (mA) 80
PDISS (mW) 2300
Interface Interleaved, LVDS
VSUPPLY (V) 3.3
Package/Pins CSBGA/256
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Design & Development

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Description

The MAX5882 evaluation kit (EV kit) contains a single MAX5882 14-Bit, 4.6Gsps cable downstream, direct RF synthesis digital-to-analog converter (DAC). The evaluation board includes a transformer circuit used to convert the differential DAC output to a single-ended 50Ω signal. An on-board, 3-transformer circuit is also provided to convert a single-ended 50Ω clock source into the well balanced, 50% duty cycle, 100Ω differential source required by the MAX5882.

The MAX5882 evaluation board employs two SAMTECH Q Strip® (QSH) connectors for the digital interface. The EV kit includes an adapter board that converts the QSH interface to an FPGA Mezzanine Connector (FMC). The FMC connector is commonly available on Commercial Off-the-Shelf (COTS) FPGA evaluation boards, such as the Xilinx© Virtex®-7 VC707 EV kit.

The MAX5882 EV kit is supported by the MUXDAC Data Source based on a VC707 FPGA board which provides a useful tool for supplying the digital signals required to evaluate the MAX5882. Refer to the MUXDAC Data Source User’s Guide for more information.

View Details

Features

  • Evaluates the MAX5882
  • 4.6Gsps Maximum Update Rate
  • Proven 12-Layer PCB Design
  • Single-Ended Clock Interface
    • 2.3GHz Maximum Clock Rate
  • Single-Ended DAC Output Interface
    • Wideband Output Transformer
    • Supports from 50MHz to >2GHz
  • On-Board 1.25V Reference Circuitry
  • On-Board Divide-by-Two Data Clock Divider
    • Reduces Frequency for Use with FPGA/ASIC
  • Fully Assembled and Tested

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Parameters

Parametric specs for High-Speed DACs (≥ 1MHz)
Resolution (bits) 14
# Channels 1
fCLK (Msps) 4600
IOUT (mA) 80
PDISS (mW) 2300
Interface Interleaved, LVDS
VSUPPLY (V) 3.3
Package/Pins CSBGA/256

Key Features

  • 4.6Gsps Output Update Rate
    • Direct RF Synthesis from 47MHz to 1003MHz
    • No Aliasing of HD3 into Cable Band
  • Industry-Leading DOCSIS 3.0 Performance Noise Floor
    • -70dBc at fOUT = 900MHz, 8 Channel (256 QAM)
    • -66dBc at fOUT = 900MHz, 16 Channel (256 QAM)
    • -62dBc at fOUT = 900MHz, 32 Channel (256 QAM)
    • -57dBc at fOUT = 500MHz, 128 Channel (256 QAM)
  • High Output Power 9dBm (CW)
    • Enables Low Solution Power
  • 4:1 Multiplexed LVDS Inputs
    • Up to 1150Mwps Each Port
    • Double Data Rate (DDR) Mode
  • On-Chip DLL for Input Data Synchronization
  • Parity Error Flag
  • Internal 50Ω Differential Output Termination
  • Input Register Scan Mode
  • Compact 17mm × 17mm, 256 CSBGA Package
  • Evaluation Kit Available (Order MAX5882EVKIT+)

Applications/Uses

  • Broadcast Video Modulators
  • Cable Modem Termination Systems (CMTS)
  • DOCSIS-Compliant Edge QAM Devices
  • Video-on-Demand (VOD)

Description

The MAX5882 14-bit, 4.6Gsps digital-to-analog converter (DAC) is designed for direct RF synthesis of multicarrier quadrature amplitude modulation (QAM) signals in cable modem termination systems (CMTS) and edge QAM (EQAM) devices. The DAC features excellent spurious, noise, and adjacent-channel power (ACP) performance, and directly synthesizes multiple carriers in the 47MHz to 1003MHz cable downstream band, as defined by the Data-Over-Cable Service Interface Specification (DOCSIS®). The 4.6Gsps update rate allows digital generation of signals with more than 2GHz bandwidth.

The device has four 14-bit, multiplexed, low-voltage differential signaling (LVDS) input ports that each operate at up to 1150Mwps in double data rate (DDR) or single data rate (SDR) mode. The inputs also accept differential high-speed transceiver logic (DHSTL) input levels. The device accepts a clock at 1/2 the DAC update rate, as conversion is triggered on both rising and falling clock edges. The input data rate on each port is 1/4 the DAC update rate or 1/2 of the clock rate. The device contains a delay-locked loop (DLL) that simplifies the interface to FPGA or ASIC devices. Using the DLL, the phase of the output clock (DATACLK) is adjusted to ensure that the input LVDS data bus has the proper timing relationship to the on-chip clock used to latch the data.

The device is a current-steering DAC with an integrated 50Ω differential output termination to ensure optimum dynamic performance. Operating from 3.3V and 1.8V power supplies, the device consumes 2.3W at 4.6Gsps. The device is specified over the upper commercial temperature range (0°C to +85°C) and is offered in a 256 CSBGA lead(Pb)-free/RoHS-compliant package.

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