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Texas Instruments DS125DF410SQE/NOPB
- Part No.:
- DS125DF410SQE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
DS125DF410SQE/NOPB.pdf
- Description:
- IC INTERFACE SPECIALIZED 48WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:724
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Product details
Overview
DS125DF410SQE/NOPB from Texas Instruments is a quad-channel, multi-rate retimer IC for high-speed serial links, featuring adaptive CTLE (up to 34-dB boost at 5 GHz), self-calibrating 5-tap DFE, CDR with <300 ps latency, and programmable transmit de-emphasis (–15 dB) and VOD (600–1300 mVp-p). It operates across 9.8–12.5 Gbps and submultiples (÷2/4/8) to support 10GbE, CPRI, and Interlaken in backplane and optical module interfaces.
For engineers reviewing the DS125DF410SQE/NOPB datasheet, DS125DF410SQE/NOPB pinout, DS125DF410SQE/NOPB application, or DS125DF410SQE/NOPB equivalent, key selection considerations include per-channel independent rate locking, low-power operation (180 mW/channel), 2.5-V single-supply compatibility, WQFN-48 thermal performance (RθJA = 26.1°C/W), and SMBus/EEPROM configuration flexibility for production deployment.
Technical Context
The DS125DF410SQE/NOPB implements a full signal-conditioning data path per channel: adaptive CTLE followed by a self-calibrating 5-tap DFE, a CDR with 5-MHz PLL bandwidth and 2-ms lock time (fixed-rate mode), and a CML output driver with analog de-emphasis. Each channel uses independent loop filter networks (LPF_CPn/LPF_REFn) and shares a 25-MHz reference clock input for VCO coarse calibration - not used for phase alignment.
Configuration occurs via a single 3.3-V-tolerant SMBus interface (SDA/SDC) supporting both slave-mode register writes and master-mode EEPROM auto-load. Real-time diagnostics include per-channel CDR lock indicators (LOCKn), interrupt signaling (INT), on-chip eye monitor (EOM), and PRBS generator - all accessible without external test equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 9.8–12.5 Gbps per channel, plus submultiples (÷2/4/8); enables protocol-agnostic support for 10GbE, CPRI Options 3–7, and Interlaken lane rates. |
| Equalization | Adaptive CTLE (up to 34-dB boost at 5 GHz) + self-calibrating 5-tap DFE; compensates for up to 40-inch FR-4 loss and crosstalk-induced ISI. |
| Latency | ~300 ps propagation delay; preserves timing budgets in low-latency interconnects like switch fabric and ASIC-to-optical-module paths. |
| Power | 720 mW typical total (180 mW/channel); enables thermal management in dense QSFP/SFP+ line cards without forced air. |
| Supply | Single 2.5 V ±5% supply; simplifies power delivery versus dual-rail alternatives and reduces BOM count. |
| Package | WQFN-48 (7 mm × 7 mm, 0.5-mm pitch); exposes thermal pad (DAP) tied to ground plane via ≥4 vias for RθJA = 26.1°C/W. |
| Jitter Performance | Input sinusoidal jitter tolerance: 0.6 UI (10 kHz–250 MHz); output total jitter: 10 ps (BER = 10−12); resets system jitter budget for cascaded links. |
Pinout & Package
DS125DF410SQE/NOPB uses a 48-pin WQFN package (7 mm × 7 mm, 0.5-mm pitch) with exposed thermal pad (DAP) requiring connection to PCB ground plane via ≥4 vias for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RXPn / RXNn (n=0–3) | CML differential input pair | 100-Ω differential input impedance; accepts degraded signals down to 10 mVp-p (signal detect off threshold) for robust link acquisition. |
| TXPn / TXNn (n=0–3) | CML differential output pair | 100-Ω differential output impedance; supports programmable VOD (600–1300 mVp-p) and de-emphasis (0 to –15 dB) to match channel loss profiles. |
| LOCKn / ADDRn | Multi-function LVCMOS pin | Configurable as CDR lock indicator (active-high) or SMBus address strap (read at power-up); enables per-channel status monitoring or multi-device addressing. |
| LPF_CPn / LPF_REFn | Analog loop filter node | Requires 22-nF ±10% capacitor per channel; sets PLL stability and jitter transfer response for each independent CDR. |
| REFCLK_IN / REFCLK_OUT | 25-MHz reference I/O | 2.5-V analog input for VCO coarse calibration; buffered 2.5-V output allows daisy-chaining multiple DS125DF410SQE/NOPB devices on one board. |
| SDA / SDC / INT | 3.3-V-tolerant open-drain I/O | SMBus interface (pull-up required) and interrupt signaling; enables system-level fault reporting (loss of signal, CDR unlock, eye closure). |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel independent rate locking | Each of four channels locks autonomously to any rate between 9.8–12.5 Gbps or its submultiples, enabling mixed-protocol line cards (e.g., 10GbE + CPRI on same device). |
| On-chip eye monitor (EOM) | Real-time eye diagram sampling without external test gear; accelerates system bring-up and field tuning of equalizer settings. |
| PRBS generator | Integrated pseudo-random bit sequence source per channel; eliminates need for external pattern generators during BER validation. |
| Protocol-select fast lock | Uses 25-MHz reference to calibrate VCO coarse tuning before CDR acquisition, reducing lock time to 2 ms (fixed-rate mode) versus >70 ms for full adaptation. |
| Thermal-aware design | Specified operation from –40°C to +85°C ambient; validated CDR lock stability (TEMPLOCK) across full range ensures reliability in telecom chassis environments. |
Applications
| Front-Port SFP+ Optical Modules | Backplane Reach Extension |
|---|---|
Use Scenario: Retiming 10GbE or CPRI traffic from ASIC to SFP+ pluggable optics over short (<1m) twinaxial copper cables. IC Role / Device Role / Timing Role: Quad-channel retimer restoring signal integrity at module edge; replaces passive copper DACs with active signal conditioning. Use Value: Enables use of lower-cost SFP+ modules with longer reach and higher BER margin (1×10−15) than passive solutions. | Use Scenario: Extending 12.5-Gbps Interlaken or InfiniBand lanes across 20–40 inch FR-4 backplanes in switch fabric or line cards. IC Role / Device Role / Timing Role: Per-lane retimer with adaptive CTLE+DFE correcting frequency-dependent loss and post-cursor ISI. Use Value: Achieves clean eye opening after 40-inch stripline (4-mil trace) where passive equalization fails, eliminating need for expensive low-loss laminates. |
| ASIC-to-Optical Interface | QSFP-Based Midplane Interconnect |
Use Scenario: Conditioning high-speed serial outputs from network ASICs before driving optical transceivers in metro/aggregation routers. IC Role / Device Role / Timing Role: Signal integrity bridge between digital ASIC core and analog optical front-end; provides jitter cleanup and amplitude control. Use Value: Reduces system-level jitter accumulation, allowing tighter timing margins and higher clock frequencies in next-gen packet processors. | Use Scenario: Enabling reliable 4×10G or 4×12.5G QSFP links across midplane connectors in modular chassis with mechanical misalignment and crosstalk. IC Role / Device Role / Timing Role: Four independent retimer channels aligned to QSFP electrical interface; handles skew and loss variation across connector pairs. Use Value: Supports hot-plug interoperability and link training across variable midplane insertion loss without firmware reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar retimer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS125RT410 | EQ+CDR+DE only (no DFE); 9.8–12.5 Gbps; lower power (120 mW/channel); no PRBS generator or EOM. | Suitable for less lossy channels (e.g., short DACs) where DFE is unnecessary; lacks real-time diagnostics. | Select DS125RT410 when cost and power are prioritized over advanced equalization and debug capability. |
| DS100DF410 | Same architecture but 10.3125 Gbps fixed-rate; no submultiple support; lower max EQ boost (24 dB at 5 GHz). | Targeted for legacy 10GbE-only systems; cannot adapt to CPRI or Interlaken variable rates. | Choose DS100DF410 only for cost-sensitive, single-standard deployments where multi-rate flexibility is not required. |
Compared with DS125RT410 and DS100DF410, the DS125DF410SQE/NOPB uniquely combines full multi-rate support (9.8–12.5 Gbps + subrates), integrated DFE for severe ISI correction, and on-chip diagnostics - making it the only option for future-proof, high-margin optical and backplane designs requiring protocol agility and field tunability.
Availability
DS125DF410SQE/NOPB is available at Aetrix Electronics and suitable for high-speed serial interconnects requiring stable component supply, including 10GbE line cards, CPRI-based wireless fronthaul, and Interlaken switch fabrics.
Supply support for DS125DF410SQE/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The DS125DF410SQE/NOPB belongs to TI's high-speed retimer product line, engineered specifically for signal integrity restoration in multi-gigabit serial links - targeting optical module manufacturers, network equipment OEMs, and high-performance computing interconnect designers.
FAQ
What data rates does the DS125DF410SQE/NOPB support, and how does subrate detection work?
The DS125DF410SQE/NOPB supports independent per-channel locking from 9.8 to 12.5 Gbps and all integer submultiples (÷2, ÷4, ÷8), enabling compatibility with 10GbE, CPRI Options 3–7, and Interlaken lane rates. Subrate detection uses the 25-MHz reference clock to validate VCO frequency during lock acquisition, preventing false lock on periodic patterns. This ensures reliable operation even with highly structured traffic such as PRBS-7 or idle sequences.
How does the DS125DF410SQE/NOPB differ from the DS125RT410 in terms of equalization capability?
The DS125DF410SQE/NOPB integrates both adaptive CTLE and a self-calibrating 5-tap DFE, while the DS125RT410 provides CTLE and CDR only - omitting DFE. This makes the DS125DF410SQE/NOPB capable of correcting post-cursor ISI from severe channel impairments (e.g., 40-inch FR-4), whereas the DS125RT410 is limited to precursor and frequency-dependent loss compensation. The DS125DF410SQE/NOPB also includes on-chip PRBS generation and eye monitoring, absent in DS125RT410.
Can the DS125DF410SQE/NOPB operate with a single 2.5-V supply, and what are the power implications?
Yes, the DS125DF410SQE/NOPB operates from a single 2.5 V ±5% supply, consuming 720 mW typical total (180 mW per channel). This eliminates need for auxiliary voltage rails and simplifies PDN design. Its thermal performance (RθJA = 26.1°C/W) is validated for WQFN-48 packaging, allowing operation up to +85°C ambient without derating - critical for densely packed line cards where airflow is constrained.
What is the role of the 25-MHz reference clock (REFCLK_IN) in the DS125DF410SQE/NOPB, and is it mandatory?
The 25-MHz reference clock on REFCLK_IN is mandatory for VCO coarse calibration during power-up, CDR reset, or loss-of-lock recovery. It enables fast lock (2 ms in fixed-rate mode) and prevents false lock by verifying VCO frequency accuracy. While not used for phase alignment, it must be present within ±100 ppm (24.9975–25.0025 MHz) and meet specified pulse width (≥4 ns) and voltage thresholds (VIH ≥1.75 V, VIL ≤0.7 V) to ensure reliable operation of the DS125DF410SQE/NOPB.
How is configuration handled on the DS125DF410SQE/NOPB - via SMBus or EEPROM?
The DS125DF410SQE/NOPB supports both SMBus slave mode (register writes via SDA/SDC) and SMBus master mode (auto-loading from external EEPROM). In master mode, the device reads configuration on power-up using READ_EN and ALL_DONE signals; in slave mode, host processor writes registers directly. Both methods configure identical parameters: rate/subrate, VOD, de-emphasis, CTLE/DFE enable, and diagnostic features - giving designers flexibility for prototyping (SMBus) or mass production (EEPROM).
DS125DF410SQE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Ethernet
- Interface:
- I2C
- Voltage - Supply:
- 2.375V ~ 2.625V
- Supplier Device Package:
- 48-WQFN (7x7)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
DS125DF410SQE/NOPB FAQ
1.How can I place an order for DS125DF410SQE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for DS125DF410SQE/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS125DF410SQE/NOPB reliable?
The price and inventory of DS125DF410SQE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS125DF410SQE/NOPB is usually 5 days.
3.What payment methods are accepted for DS125DF410SQE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS125DF410SQE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS125DF410SQE/NOPB?
DS125DF410SQE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS125DF410SQE/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS125DF410SQE/NOPB?
For technical support, including DS125DF410SQE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS125DF410SQE/NOPB requirements.
6.How does Aetrix verify that DS125DF410SQE/NOPB is sourced from the original manufacturer or authorized distributors?
All DS125DF410SQE/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS125DF410SQE/NOPB meets industry standards.
7.What is the process for return or replacement of DS125DF410SQE/NOPB?
All DS125DF410SQE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with DS125DF410SQE/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS125DF410SQE/NOPB part is unused and in its original packaging.
Return procedure for DS125DF410SQE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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