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Semtech Corporation GN2405AINE3
- Part No.:
- GN2405AINE3
- Manufacturer:
- Semtech Corporation
- Category:
- Application Specific Clock/Timing
- Package:
- 48-QFN
- Datasheet:
-
GN2405AINE3.pdf
- Description:
- IC CONDITIONER RE-TIMER
- Quantity:
- Payment:
- Shipping:
Inventory:3,155
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Product details
Overview
GN2405AINE3 from Gennum is a quad-channel 10 Gb/s clock and data recovery (CDR) IC with integrated input equalizer, designed for transmit-side signal conditioning in high-speed serial links. It supports automatic locking from 9.95–11.3 Gb/s, offers 400–800 mV programmable differential output voltage, delivers <0.7 UI input jitter tolerance, enables up to 28 dB loss compensation via de-emphasis, and operates from a single 3.3 V supply - deployed in QSFP active copper cables and optical modules.
For engineers reviewing the GN2405AINE3 datasheet, pinout, applications, or equivalent options, key selection criteria include reference-free CDR operation, per-channel rate adaptability (2.5/5/10 Gb/s), I²C configurability, EEPROM auto-load capability, and compatibility with InfiniBand QDR and 40GbE line-card retiming architectures.
Technical Context
The GN2405AINE3 implements a reference-free CDR architecture per channel, eliminating need for external clock sources while supporting independent locking across 9.95–11.3 Gb/s. Its input equalizer compensates trace and connector losses pre-CDR, and its transmit de-emphasis stage targets up to 28 dB of channel loss.
Each channel features configurable loss-of-signal detection with adjustable threshold, I²C-based control of CDR, EQ, and driver parameters, and automatic configuration loading from on-board EEPROM - enabling plug-and-play deployment in module and backplane applications without host firmware intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate Range | 9.95–11.3 Gb/s full-rate; also supports 2.5 Gb/s (quarter) and 5 Gb/s (half) modes |
| Input Jitter Tolerance | Better than 0.7 UI - ensures reliable locking under high crosstalk/noise conditions |
| Differential Output Voltage | Programmable 400–800 mV - matches varying receiver sensitivity requirements |
| De-emphasis Capability | Compensates up to 28 dB channel loss - extends reach in copper cables and backplanes |
| Supply Voltage | Single 3.3 V ±5% - simplifies power delivery vs. multi-rail alternatives |
| Control Interface | I²C-compatible serial interface - enables centralized configuration and monitoring |
| Configuration Storage | Auto-loads from external EEPROM - eliminates boot-time host initialization |
Pinout & Package
GN2405AINE3 is housed in a 7×7 mm, 48-pin QFN package with exposed thermal pad (RoHS-compliant, lead-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0P/IN0N – IN3P/IN3N | Differential data inputs (4 channels) | Accept AC-coupled high-speed serial data; input equalizer applies adaptive loss compensation |
| OUT0P/OUT0N – OUT3P/OUT3N | Differential data outputs (4 channels) | Deliver retimed, de-emphasized signals; output amplitude programmable via I²C |
| SCL/SDA | I²C bidirectional control bus | Enable register access for CDR lock status, EQ gain, driver settings, and LOS threshold |
| LOS0–LOS3 | Loss-of-signal indicator outputs | Open-drain active-low flags per channel; threshold adjustable via configuration registers |
| VDD/VSS | Power and ground terminals | Multiple dedicated pins ensure low-noise 3.3 V distribution and stable CDR operation |
Key Features
| Feature | Design Value |
|---|---|
| Reference-free CDR architecture | Eliminates external clock source dependency, reducing BOM count and layout complexity |
| Per-channel rate detection & locking | Autonomously identifies and locks to 2.5/5/10 Gb/s data streams without host coordination |
| Integrated input equalizer | Compensates PCB trace and connector insertion loss before CDR sampling - critical for transmit-side placement |
| Programmable transmit de-emphasis | Adjusts high-frequency boost to match channel loss profile, enabling >40-inch FR4 trace reach |
| EEPROM auto-configuration | Loads startup settings at power-on - removes requirement for host-initiated register writes |
Applications
| InfiniBand QDR Active Copper Cable | QSFP+ Line Card Retimer |
|---|---|
Use Scenario: High-density server interconnect using active twin-axial copper cables compliant with InfiniBand QDR (40 Gb/s aggregate). IC Role / Device Role / Timing Role: Transmit-side CDR with input equalization and de-emphasis placed at ASIC edge to condition signals before cable launch. Use Value: Compensates connector/trace loss and resets jitter budget, enabling robust 40 Gb/s operation over 3–5 m cables without external amplifiers. | Use Scenario: Front-panel QSFP+ module interface on enterprise switch line cards requiring signal integrity restoration. IC Role / Device Role / Timing Role: Retimer positioned between ASIC SerDes and QSFP+ cage to recover degraded signals from long backplane traces. Use Value: Input jitter tolerance >0.7 UI and low output jitter preserve timing margin; I²C configurability allows per-port tuning. |
| 10GbE Optical Module Transmit Path | 10G Serial Backplane Extender |
Use Scenario: SFP+ or XFP optical transceivers where the host ASIC drives laser diodes via TIAs and drivers. IC Role / Device Role / Timing Role: Transmit CDR located between host ASIC and laser driver to equalize board-level interconnect before modulation. Use Value: Input EQ mitigates FR4 loss; de-emphasis compensates driver-to-laser path loss - improves extinction ratio and eye opening. | Use Scenario: Dense 10 Gb/s serial backplane in telecom shelf systems with >20 inch FR4 traces and multiple connectors. IC Role / Device Role / Timing Role: Retimer placed mid-backplane to restore signal integrity between line card and fabric card. Use Value: Resets crosstalk and jitter budgets; 28 dB de-emphasis headroom supports legacy and upgraded backplane variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CDR and signal conditioning applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| GN2406AINE3 | Features limiting amplifiers instead of input equalizer; higher input sensitivity but no EQ capability | Optimized for receive-side optical module use (TIA output conditioning), not transmit-side trace loss compensation | Select GN2406AINE3 when interfacing directly with TIA outputs in optical receivers; GN2405AINE3 remains preferred for transmit-side PCB trace equalization |
| MAX3799AEE+T | Quad 10 Gb/s CDR with integrated limiting amplifier and de-emphasis; requires reference clock; no input EQ | Targeted at receive-side retiming in SFP+/XFP modules; lacks autonomous rate detection and reference-free operation | Choose MAX3799AEE+T only if system design mandates external clocking and receive-path placement; GN2405AINE3 provides superior flexibility for transmit-side, clockless deployment |
Compared with GN2406AINE3 and MAX3799AEE+T, GN2405AINE3 uniquely combines reference-free CDR, per-channel rate adaptability, and input equalization - making it the only option among the three qualified for transmit-side trace-loss compensation without external clock or host firmware coordination.
Availability
GN2405AINE3 is available at Aetrix Electronics and suitable for optical transceiver modules, active copper cable assemblies, and 10 Gb/s serial backplane designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for GN2405AINE3 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
Gennum Corporation was a Canadian fabless semiconductor company specializing in high-speed analog and mixed-signal ICs for optical communications and data center interconnects before its acquisition by Semtech in 2012.
The GN2405AINE3 belongs to Gennum's CDR and signal-conditioning product line, engineered specifically for reference-free, multi-rate serial link extension in optical modules, active cables, and backplane applications.
FAQ
What data rates does the GN2405AINE3 support?
The GN2405AINE3 supports full-rate operation from 9.95 Gb/s to 11.3 Gb/s, plus automatic detection and locking to quarter-rate (2.5 Gb/s) and half-rate (5 Gb/s) modes. This multi-rate capability enables backward compatibility with legacy 10GbE, InfiniBand DDR/QDR, and Fibre Channel systems without reconfiguration. The GN2405AINE3 achieves this through autonomous rate detection logic within each CDR channel.
Does the GN2405AINE3 require an external reference clock?
No, the GN2405AINE3 uses Gennum's reference-free CDR architecture and does not require an external clock source. It recovers timing directly from the incoming data stream, simplifying system design, reducing component count, and avoiding clock distribution skew issues. This feature is intrinsic to the GN2405AINE3 and confirmed in its functional block diagram and electrical specifications.
How is configuration handled on the GN2405AINE3?
The GN2405AINE3 supports I²C-based register access for real-time control of CDR lock status, input equalizer gain, output de-emphasis level, and loss-of-signal thresholds. It also automatically loads default configuration from an external EEPROM at power-up, enabling standalone operation without host processor initialization. This dual-mode configuration is documented in the GN2405AINE3 device initialization sequence.
What is the purpose of the input equalizer in the GN2405AINE3?
The input equalizer in the GN2405AINE3 compensates for high-frequency loss in PCB traces and connectors upstream of the CDR, preserving signal integrity prior to clock recovery. Unlike GN2406AINE3 (which uses limiting amplifiers), the GN2405AINE3's equalizer makes it suitable for transmit-side placement where trace loss dominates. This function is explicitly defined in the GN2405AINE3's signal path architecture.
Is the GN2405AINE3 pin-compatible with any other devices?
Yes, the GN2405AINE3 is fully pin-compatible with the GN2406AINE3, differing only in internal front-end circuitry (input equalizer vs. limiting amplifier). This allows shared PCB layout across both transmit- and receive-optimized variants. Pin compatibility is guaranteed per Gennum's GN2405/GN2406 datasheet revision history and mechanical drawings.
GN2405AINE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 48-QFN
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- PLL:
- No
- Main Purpose:
- InfiniBand, Ethernet
- Input:
- Clock
- Output:
- Clock
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 4:4
- Differential - Input:Output:
- Yes/Yes
- Frequency - Max:
- -
- Voltage - Supply:
- 3.3V
- Operating Temperature:
- -
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-QFN (7x7)
GN2405AINE3 FAQ
1.How can I place an order for GN2405AINE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for GN2405AINE3 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 GN2405AINE3 reliable?
The price and inventory of GN2405AINE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for GN2405AINE3 is usually 5 days.
3.What payment methods are accepted for GN2405AINE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for GN2405AINE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for GN2405AINE3?
GN2405AINE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your GN2405AINE3 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 GN2405AINE3?
For technical support, including GN2405AINE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your GN2405AINE3 requirements.
6.How does Aetrix verify that GN2405AINE3 is sourced from the original manufacturer or authorized distributors?
All GN2405AINE3 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 GN2405AINE3 meets industry standards.
7.What is the process for return or replacement of GN2405AINE3?
All GN2405AINE3 units undergo pre-shipment inspection (PSI). If there is an issue with GN2405AINE3, 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 GN2405AINE3 part is unused and in its original packaging.
Return procedure for GN2405AINE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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