Product details

Type Redriver Protocols General purpose, PCIe1, PCIe2, PCIe3, SAS1, SAS2, SAS3, SATA1, SATA2, SATA3 Applications PCIe, SATA, SAS Number of channels (#) 8 Speed (Max) (Gbps) 12.5 Supply voltage (V) 3.3, 2.5 Rating Catalog Operating temperature range (C) -40 to 85
Type Redriver Protocols General purpose, PCIe1, PCIe2, PCIe3, SAS1, SAS2, SAS3, SATA1, SATA2, SATA3 Applications PCIe, SATA, SAS Number of channels (#) 8 Speed (Max) (Gbps) 12.5 Supply voltage (V) 3.3, 2.5 Rating Catalog Operating temperature range (C) -40 to 85
WQFN (NJY) 54 55 mm² 10 x 5.5
  • Low 65-mW/Channel (Typ) Power Consumption, With Option
    to Power Down Unused Channels
  • Linear Equalization allows for Link Training in PCIe and SAS
  • Supports Out-of-Band (OOB) Signaling
  • Advanced Signal Conditioning B-Side I/O
    • Receive CTLE up to 24 dB at 6 GHz
    • Transmit (Tx) DE > 10 dB
    • Tx Output Voltage: 700 mV to 1400 mV
  • Advanced Signal Conditioning A-Side I/O
    • Receive CTLE up to 10 dB at 6 GHz
    • Linear output drive
    • Output voltage range over 1200mV
  • Programmable via Terminal Selection, EEPROM, or
    SMBus Interface
  • Single Supply Voltage: 2.5 V or 3.3 V
  • −40°C to 85°C Operating Temperature Range
  • 4 kV HBM ESD Rating
  • Flow-Thru Layout in 10mmx5.5mm 54-Terminal Leadless
    WQFN Package
  • Low 65-mW/Channel (Typ) Power Consumption, With Option
    to Power Down Unused Channels
  • Linear Equalization allows for Link Training in PCIe and SAS
  • Supports Out-of-Band (OOB) Signaling
  • Advanced Signal Conditioning B-Side I/O
    • Receive CTLE up to 24 dB at 6 GHz
    • Transmit (Tx) DE > 10 dB
    • Tx Output Voltage: 700 mV to 1400 mV
  • Advanced Signal Conditioning A-Side I/O
    • Receive CTLE up to 10 dB at 6 GHz
    • Linear output drive
    • Output voltage range over 1200mV
  • Programmable via Terminal Selection, EEPROM, or
    SMBus Interface
  • Single Supply Voltage: 2.5 V or 3.3 V
  • −40°C to 85°C Operating Temperature Range
  • 4 kV HBM ESD Rating
  • Flow-Thru Layout in 10mmx5.5mm 54-Terminal Leadless
    WQFN Package

The DS125BR401A is an extremely low-power high-performance repeater/redriver designed to support four lanes carrying high speed interface up to 12 Gbps. The B-Side receiver’s continuous time linear equalizers (CTLE) provide high frequency boost of up to +24 dB at 6 GHz (12 Gbps) and are capable of opening an input eye that is completely closed due to inter symbol interference (ISI) induced by interconnect medium such as backplane traces or twinaxial copper cables. The programmable equalization allows maximum flexibility in the physical placement within the interconnect channel. The A-Side channel has a 10 dB linear equalizer and linear output driver.

The A-Side channel has a settable 3-10 dB linear equalizer coupled to a linear output driver. When operating in SAS-3 and PCIe Gen-3 applications the DS125BR401A preserves transmit signal characteristics allowing the host controller and the end point to negotiate transmit equalizer coefficients. This transparency to the link training protocol aides system level interoperability and minimum latency.

The programmable settings can be applied easily via Terminals, software (SMBus or I2C), or loaded via an external EEPROM. In EEPROM mode, the configuration information is automatically loaded on power up, which eliminates the need for an external microprocessor or software driver.

The DS125BR401A is an extremely low-power high-performance repeater/redriver designed to support four lanes carrying high speed interface up to 12 Gbps. The B-Side receiver’s continuous time linear equalizers (CTLE) provide high frequency boost of up to +24 dB at 6 GHz (12 Gbps) and are capable of opening an input eye that is completely closed due to inter symbol interference (ISI) induced by interconnect medium such as backplane traces or twinaxial copper cables. The programmable equalization allows maximum flexibility in the physical placement within the interconnect channel. The A-Side channel has a 10 dB linear equalizer and linear output driver.

The A-Side channel has a settable 3-10 dB linear equalizer coupled to a linear output driver. When operating in SAS-3 and PCIe Gen-3 applications the DS125BR401A preserves transmit signal characteristics allowing the host controller and the end point to negotiate transmit equalizer coefficients. This transparency to the link training protocol aides system level interoperability and minimum latency.

The programmable settings can be applied easily via Terminals, software (SMBus or I2C), or loaded via an external EEPROM. In EEPROM mode, the configuration information is automatically loaded on power up, which eliminates the need for an external microprocessor or software driver.

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Technical documentation

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Type Title Date
* Data sheet DS125BR401A Low-Power 12 Gbps 4-Lane Linear Repeater With Equalization datasheet (Rev. A) 31 Mar 2014
Application note Linear Repeaters Used in SAS/SATA Applications 21 Sep 2015
Application note Channel Tuning Made Easy Using Linear Repeaters for 10G and 12G Applications 20 Jan 2015
Application note Understanding EEPROM Programming for High Speed Repeaters and Mux Buffers 09 Oct 2014
User guide DS125BR401AEVM User's Guide (Rev. A) 31 Mar 2014

Design & development

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Evaluation board

DS125BR401AEVM — DS125BR401AEVM: 12-Gbps 4-Lane Repeater With Equalization Evaluation Module

The DS125BR401AEVM – SMA evaluation kit provides a complete high band-width platform to evaluate the signal integrity and signal conditioning features of the Texas Instruments DS125BR401A Redriver/Repeater with Equalization and De-emphasis. SMA edge launch connectors are used as the input and the (...)

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Simulation model

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SNLM143.PDF (25 KB) - IBIS Model
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PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Reference designs

TIDA-00425 — 12 Gbps SAS-3 Link Extender Reference Design

This reference design extends the link distance and loss budget of high speed SAS-3 data paths, using configurable equalization, de-emphasis, and output voltage. It supports SAS and SATA interfaces from 1.5 Gbps to 12 Gbps using a miniSAS-HD interface.
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