DS125BR820

ACTIVE

12-Gbps 8-channel linear redriver with equalization

Product details

Type Redriver Protocols 10G-KR, 10G-SR/LR, 40G-KR4, 40G-SR4/LR4, CPRI, Fibre Channel, General purpose, Infiniband, Interlaken, OBSAI, PCIe1, PCIe2, PCIe3, SAS1, SAS2, SAS3, SATA1, SATA2, SATA3, sRIO Applications Backplane, Front Port, Peripheral I/O Number of channels 8 Speed (max) (Gbpp) 12.5 Supply voltage (V) 2.5, 3.3 Rating Catalog Operating temperature range (°C) -40 to 85
Type Redriver Protocols 10G-KR, 10G-SR/LR, 40G-KR4, 40G-SR4/LR4, CPRI, Fibre Channel, General purpose, Infiniband, Interlaken, OBSAI, PCIe1, PCIe2, PCIe3, SAS1, SAS2, SAS3, SATA1, SATA2, SATA3, sRIO Applications Backplane, Front Port, Peripheral I/O Number of channels 8 Speed (max) (Gbpp) 12.5 Supply voltage (V) 2.5, 3.3 Rating Catalog Operating temperature range (°C) -40 to 85
WQFN (NJY) 54 55 mm² 10 x 5.5
  • Low 70 mW/Channel (Typ) Power Consumption,
    with Option to Power Down Unused Channels
  • Seamless Link Training Support
  • Enables Host ASIC to Meet Front-Port Eye Mask
    Requirements over Longer Reach
  • Advanced Configurable Signal Conditioning I/O
    • Receive CTLE up to 10 dB at 6 GHz
    • Linear Output Driver
    • Variable Output Voltage Range up to 1200
      mVp-p
  • Programmable via Pin Selection, EEPROM, or
    SMBus Interface
  • Single Supply Voltage: 2.5 V or 3.3 V
  • −40°C to 85°C Operating Temperature Range
  • Flow-Thru Layout in 10 mm × 5.5 mm 54-Pin
    Leadless WQFN Package
  • Low 70 mW/Channel (Typ) Power Consumption,
    with Option to Power Down Unused Channels
  • Seamless Link Training Support
  • Enables Host ASIC to Meet Front-Port Eye Mask
    Requirements over Longer Reach
  • Advanced Configurable Signal Conditioning I/O
    • Receive CTLE up to 10 dB at 6 GHz
    • Linear Output Driver
    • Variable Output Voltage Range up to 1200
      mVp-p
  • Programmable via Pin Selection, EEPROM, or
    SMBus Interface
  • Single Supply Voltage: 2.5 V or 3.3 V
  • −40°C to 85°C Operating Temperature Range
  • Flow-Thru Layout in 10 mm × 5.5 mm 54-Pin
    Leadless WQFN Package

The DS125BR820 is an extremely low-power high-performance repeater/redriver designed to support eight channels carrying high speed interface up to 12.5 Gbps, such as 40G-CR4, 40G-KR4, SAS/SATA, and PCIe. The receiver’s continuous time linear equalizer (CTLE) provides high frequency boost that is programmable from 3 to 10 dB at 6 GHz (12 Gbps) followed by a linear output driver. The CTLE receiver is capable of opening an input eye that is completely closed due to inter symbol interference (ISI) induced by interconnect medium such as board traces or twin axial-copper cables. The programmable equalization maximizes the flexibility of physical placement within the interconnect channel and improves overall channel performance.

When operating in 40G-CR4/KR4, SAS/SATA, and PCIe applications, the DS125BR820 preserves transmit signal characteristics, thereby allowing the host controller and the end point to negotiate transmit equalizer coefficients. This transparency in the link training protocol facilitates system level interoperability and minimizes latency.

The programmable settings can be applied easily via pin control, software (SMBus or I2C), or direct loading from an external EEPROM. In EEPROM mode, the configuration information is automatically loaded on power up, thereby eliminating the need for an external microprocessor or software driver.

The DS125BR820 is an extremely low-power high-performance repeater/redriver designed to support eight channels carrying high speed interface up to 12.5 Gbps, such as 40G-CR4, 40G-KR4, SAS/SATA, and PCIe. The receiver’s continuous time linear equalizer (CTLE) provides high frequency boost that is programmable from 3 to 10 dB at 6 GHz (12 Gbps) followed by a linear output driver. The CTLE receiver is capable of opening an input eye that is completely closed due to inter symbol interference (ISI) induced by interconnect medium such as board traces or twin axial-copper cables. The programmable equalization maximizes the flexibility of physical placement within the interconnect channel and improves overall channel performance.

When operating in 40G-CR4/KR4, SAS/SATA, and PCIe applications, the DS125BR820 preserves transmit signal characteristics, thereby allowing the host controller and the end point to negotiate transmit equalizer coefficients. This transparency in the link training protocol facilitates system level interoperability and minimizes latency.

The programmable settings can be applied easily via pin control, software (SMBus or I2C), or direct loading from an external EEPROM. In EEPROM mode, the configuration information is automatically loaded on power up, thereby eliminating the need for an external microprocessor or software driver.

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Technical documentation

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

DS125BR820EVM — DS125BR820EVM: 12.5 Gbps 8-Channel Repeater with Equalization Evaluation Module

The DS125BR820EVM – SMA evaluation kit provides a complete high bandwidth platform to evaluate the 40GbE, PCIe, and SAS/SATA signal conditioning features of the Texas Instruments DS125BR820 repeater/redriver. The DS125BR820EVM can be used for standard compliance testing, performance evaluation, and (...)

User guide: PDF
Not available on TI.com
Support software

SIGCONARCHITECT SigCon Architect v2.0.0.8

Supported products & hardware

Supported products & hardware

Products
PCIe, SAS & SATA ICs
DS125BR111 12.5-Gbps 2-channel redrivers with input equalization DS125BR401 2.5/5.0/8.0-Gbps 4-lane PCI Express redriver with equalization & De-Emp DS125BR401A 12-Gbps 4-lane redriver with equalization DS125BR800A 12.5-Gbps 8-channel redriver with input CTLE and output De-Emphasis DS125BR820 12-Gbps 8-channel linear redriver with equalization DS160PR412 PCIe® 4.0, 16-Gbps, 4-channel linear redrivers with integrated 1:2 demux DS160PR421 PCIe® 4.0 16-Gbps 4-channel linear redrivers with integrated 2:1 mux DS160PR810 PCIe® 4.0, 16 Gbps, 8-channel linear redriver DS160PR822 PCIe® 4.0 16-Gbps 8-channel linear redriver with four 2x2 crosspoint mux DS160PT801 PCIe® 4.0 16-Gbps 8-Lane (16-Channel) retimer DS160UP822 UPI 2.0 16-Gbps 8-channel linear redriver with four 2x2 crosspoint mux DS320PR810 PCIe® 5.0, 32-Gbps, 8-channel linear redriver DS320PR822 PCIe® 5.0, 32-Gbps, 8-channel linear redriver with four 2x2 crosspoint multiplexers DS80PCI102 2.5/5.0/8.0-Gbps 1-lane PCI Express redriver with equalization and De-Emphasis DS80PCI800 2.5/5.0/8.0-Gbps 8-channel PCI Express redriver with equalization & De-Emphasis DS80PCI810 2.5/5.0/8.0-Gbps 8-channel linear redriver with equalization SN75LVPE3410 PCIe® 3.0 8-Gbps 4-Channel Linear Redriver TMUXHS4412 4-Channel 20-Gbps differential 2:1/1:2 mux/demux
Ethernet retimers, redrivers & mux-buffers
DS100BR111 10.3-Gbps ultra low power 2-ch redriver with input equalization and output de-emphasis DS100BR111A 10.3-Gbps ultra low power 2-channel redriver with input equalization DS100BR210 10.3-Gbps low power 2-ch redriver w/ input equalization and output de-emphasis DS100KR800 10.3-Gbps 8 channel (uni-directional) redriver with EQ and DE DS125BR800 2.5/5.0/8.0-Gbps 8-ch PCIe redriver with de-emphasis DS125MB203 12.5-Gbps dual port mux and fanout buffer DS64BR111 6.4-Gbps ultra low power 2-channel redriver with input equalization and output de-emphasis
Serial digital interface (SDI) ICs
LMH0318 3G HD/SD SDI reclocker with integrated cable driver LMH1218 12G SDI cable driver with integrated reclocker
Hardware development
GUI for evaluation module (EVM)
SIGCONARCHITECT SigCon Architect utility tool
Evaluation board
DS100BR111EVK DS100BR111EVK Evaluation Module DS100BR210EVK DS100BR210EVK Evaluation Module DS100DF410EVK DS100DF410EVK evaluation board DS100KR800EVK DS100KR800EVK evaluation board DS110DF111EVM DS110DF111EVM: 8.5-11.3 Gbps Retimer Evaluation Module DS110DF410EVM DS110DF410EVM: 8.5 to 11.3 Gbps Quad Channel Retimer with Adaptive EQ, CDR and DFE Evaluation Module DS125BR111EVM DS125BR111EVM 12 Gbps 2-Channel Repeater with Equalization Evaluation Module DS125BR401AEVM DS125BR401AEVM: 12-Gbps 4-Lane Repeater With Equalization Evaluation Module DS125BR820EVM DS125BR820EVM: 12.5 Gbps 8-Channel Repeater with Equalization Evaluation Module DS125DF111EVM DS125DF111EVM: 9.8-12.5 Gbps Retimer Evaluation Module DS125DF410EVM DS125DF410EVM: 9.8 to 12.5 Gbps Quad Channel Retimer with Adaptive EQ, CDR and DFE Evaluation Module DS80PCI102EVK DS80PCI102 SMA Evaluation Kit DS80PCI800EVK DS80PCI800EVK Evaluation Module DS80PCI810EVM DS80PCI810 Evaluation Module LMH1218EVM LMH1218 Evaluation Module USB2ANY USB2ANY interface adapter
Interface adapter
DPS-DONGLE-EVM Interface adapter board for repeaters, retimers & SDI products evaluation module
Support software

SIGCONARCHITECT-WRTE SigCon Architect With RTE v2.0.0.8

Supported products & hardware

Supported products & hardware

Products
PCIe, SAS & SATA ICs
DS125BR111 12.5-Gbps 2-channel redrivers with input equalization DS125BR401 2.5/5.0/8.0-Gbps 4-lane PCI Express redriver with equalization & De-Emp DS125BR401A 12-Gbps 4-lane redriver with equalization DS125BR800A 12.5-Gbps 8-channel redriver with input CTLE and output De-Emphasis DS125BR820 12-Gbps 8-channel linear redriver with equalization DS160PR412 PCIe® 4.0, 16-Gbps, 4-channel linear redrivers with integrated 1:2 demux DS160PR421 PCIe® 4.0 16-Gbps 4-channel linear redrivers with integrated 2:1 mux DS160PR810 PCIe® 4.0, 16 Gbps, 8-channel linear redriver DS160PR822 PCIe® 4.0 16-Gbps 8-channel linear redriver with four 2x2 crosspoint mux DS160PT801 PCIe® 4.0 16-Gbps 8-Lane (16-Channel) retimer DS160UP822 UPI 2.0 16-Gbps 8-channel linear redriver with four 2x2 crosspoint mux DS320PR810 PCIe® 5.0, 32-Gbps, 8-channel linear redriver DS320PR822 PCIe® 5.0, 32-Gbps, 8-channel linear redriver with four 2x2 crosspoint multiplexers DS80PCI102 2.5/5.0/8.0-Gbps 1-lane PCI Express redriver with equalization and De-Emphasis DS80PCI800 2.5/5.0/8.0-Gbps 8-channel PCI Express redriver with equalization & De-Emphasis DS80PCI810 2.5/5.0/8.0-Gbps 8-channel linear redriver with equalization SN75LVPE3410 PCIe® 3.0 8-Gbps 4-Channel Linear Redriver TMUXHS4412 4-Channel 20-Gbps differential 2:1/1:2 mux/demux
Ethernet retimers, redrivers & mux-buffers
DS100BR111 10.3-Gbps ultra low power 2-ch redriver with input equalization and output de-emphasis DS100BR111A 10.3-Gbps ultra low power 2-channel redriver with input equalization DS100BR210 10.3-Gbps low power 2-ch redriver w/ input equalization and output de-emphasis DS100KR800 10.3-Gbps 8 channel (uni-directional) redriver with EQ and DE DS125BR800 2.5/5.0/8.0-Gbps 8-ch PCIe redriver with de-emphasis DS125MB203 12.5-Gbps dual port mux and fanout buffer DS64BR111 6.4-Gbps ultra low power 2-channel redriver with input equalization and output de-emphasis
Serial digital interface (SDI) ICs
LMH0318 3G HD/SD SDI reclocker with integrated cable driver LMH1218 12G SDI cable driver with integrated reclocker
Hardware development
GUI for evaluation module (EVM)
SIGCONARCHITECT SigCon Architect utility tool
Evaluation board
DS100BR111EVK DS100BR111EVK Evaluation Module DS100BR210EVK DS100BR210EVK Evaluation Module DS100DF410EVK DS100DF410EVK evaluation board DS100KR800EVK DS100KR800EVK evaluation board DS110DF410EVM DS110DF410EVM: 8.5 to 11.3 Gbps Quad Channel Retimer with Adaptive EQ, CDR and DFE Evaluation Module DS125BR111EVM DS125BR111EVM 12 Gbps 2-Channel Repeater with Equalization Evaluation Module DS125BR401AEVM DS125BR401AEVM: 12-Gbps 4-Lane Repeater With Equalization Evaluation Module DS125BR820EVM DS125BR820EVM: 12.5 Gbps 8-Channel Repeater with Equalization Evaluation Module DS125DF410EVM DS125DF410EVM: 9.8 to 12.5 Gbps Quad Channel Retimer with Adaptive EQ, CDR and DFE Evaluation Module DS250DF810EVM 25 Gbps multi-rate 8-channel retimer evaluation module DS280BR820EVM DS280BR820 28 Gbps 8-channel linear repeater evaluation module DS280MB810EVM DS280MB810 28 Gbps 8-Channel Linear Repeater With Crosspoint Evaluation Module DS80PCI102EVK DS80PCI102 SMA Evaluation Kit DS80PCI800EVK DS80PCI800EVK Evaluation Module DS80PCI810EVM DS80PCI810 Evaluation Module LMH1218EVM LMH1218 Evaluation Module
Interface adapter
DPS-DONGLE-EVM Interface adapter board for repeaters, retimers & SDI products evaluation module
Simulation model

12G Linear EQ IBIS-AMI Model

SNLM280.ZIP (11362 KB) - IBIS-AMI Model
Simulation tool

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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
Reference designs

TIDA-00417 — 2-port 40GbE/10GbE QSFP+ Signal Conditioner Reference Design

This verified reference design is a signal conditioning solution for front-port QSFP+ supporting two 40GbE ports compatible with 40G-CR4/SR4/LR4 and 10G SFF-8431 requirements. The design is applicable to optical and passive/active copper cables. It allows for reach extension between the Switch ASIC (...)
User guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
WQFN (NJY) 54 Ultra Librarian

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