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Home > Products > Integrated Circuits (ICs) > Interface > Specialized

Texas Instruments TLK4211EARGT

Name: TLK4211EARGT
Brand: Texas Instruments
SKU: TLK4211EARGT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLK4211EARGT

Manufacturer:: Texas Instruments

Category:: Specialized

Package:: -

Datasheet:: TLK4211EARGT.pdf

Description:: IC CABLE/PCB EQUALIZER 16-VQFN

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Product details

Overview

TLK4211EARGT from Texas Instruments is a fixed-gain, high-speed limiting equalizer IC designed for serial data recovery in backplane and cable interconnects. It supports multi-rate operation up to 4.25 Gbps, provides 12 dB high-frequency boost at 2.1 GHz, delivers 580–1200 mV_p-p CML differential output swing, and operates from a single 3.3-V supply. It compensates up to 30 inches of FR4 trace or 30 feet of CX4 cable in telecom and datacom link receivers.

For engineers reviewing the TLK4211EARGT datasheet, TLK4211EARGT pinout, TLK4211EARGT application, or TLK4211EARGT equivalent, key selection considerations include deterministic jitter performance (≤30 ps_p-p over 36-inch FR4), input dynamic range (200–2000 mV_p-p), offset cancellation capability, CML output termination, and 3 mm × 3 mm QFN-16 package compatibility with high-density routing.

Technical Context

The TLK4211EARGT implements a fixed equalization transfer function optimized for lossy channels, with three gain stages and on-chip 100-Ω differential input termination. Its high-speed data path includes input offset cancellation circuitry and a CML output buffer with polarity select and disable control.

It features a built-in bandgap voltage reference and bias current generation block, enabling stable operation across –40°C to 85°C. The low-frequency cutoff is 10 kHz with internal filtering, extendable via external capacitors on COC1/COC2 pins for sub-1-kHz applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Data rate	Up to 4.25 Gbps - supports Fibre Channel 1x/2x/4x and SAS-1/2 links without retiming
High-frequency boost	12 dB at 2.1 GHz - restores signal integrity degraded by FR4 trace or CX4 cable attenuation
Input sensitivity	200 mV_p-p min (BER < 10^–12) - enables reliable reception after >12 dB channel loss
Input overload	2000 mV_p-p max - maintains low-jitter output even under severe overdrive conditions
Supply current	30–38 mA at 3.3 V - ultra-low power for dense backplane receiver designs
Deterministic jitter	≤30 ps_p-p (4.25 Gbps, 36-inch FR4) - meets stringent jitter budget requirements for serial link compliance
Latency	250 ps - fixed, predictable propagation delay critical for timing-critical repeater applications

Pinout & Package

The TLK4211EARGT is housed in a 3 mm × 3 mm, 16-pin QFN package (RGT drawing) with exposed thermal pad (EP) requiring PCB ground connection. Pitch is 0.5 mm; RoHS-compliant, green finish; MSL Level-2-260°C-1 year.

Pin/Terminal	Circuit Role	Design Meaning
VCC (1,4,12)	Power supply	Three dedicated 3.3-V supply pins reduce IR drop and improve PSRR in high-speed operation
DIN+, DIN− (2,3)	Differential data input	On-chip 100-Ω differential termination eliminates external resistors; accepts AC-coupled signals
DISABLE (6)	CMOS control input	Active-high assertion disables CML output stage, reducing power and preventing bus contention
GND (8,16)	Ground reference	Dual ground pins minimize ground bounce and support clean return path for high-frequency currents
OUTPOL (9)	Polarity control	CMOS input selects normal/inverted output polarity; internally pulled up for default non-inverting mode
DOUT+, DOUT− (10,11)	CML differential output	On-chip 50-Ω single-ended back-termination to VCC simplifies load matching and reduces external components
COC1, COC2 (14,15)	Analog filter terminals	Connect external capacitor between pins to extend offset cancellation loop bandwidth below 10 kHz

Key Features

Feature	Design Value
Fixed 4.25-Gbps equalization	Optimized transfer function delivers consistent 12-dB boost at 2.1 GHz without configuration overhead
Input offset cancellation	Enables reliable operation with small-swing inputs (200 mV_p-p) while rejecting DC offsets from AC-coupled sources
CML output with polarity select	Eliminates need for external inverters; supports flexible board-level signal routing and protocol alignment
Ultra-low power consumption	38 mA max at 4.25 Gbps allows integration into thermally constrained backplane modules and line cards
Single 3.3-V supply operation	Reduces system BOM count and simplifies power delivery design versus dual-supply alternatives

Applications

Backplane Interconnect	Rack-to-Rack Interconnect
Use Scenario: Receiving 4.25-Gbps serial data across 24–36 inch FR4 striplines in telecom switch fabric blades. IC Role / Device Role / Timing Role: Fixed-gain limiting equalizer restoring signal amplitude and reducing deterministic jitter before CDR input. Use Value: Enables use of cost-effective FR4 instead of expensive low-loss laminates while maintaining BER < 10^–12.	Use Scenario: Extending high-speed links between adjacent equipment racks using CX4 copper cables up to 30 feet. IC Role / Device Role / Timing Role: Cable equalizer compensating frequency-dependent loss and ensuring full-swing CML output for downstream receivers. Use Value: Eliminates need for active repeaters or optical conversion, lowering system power and latency.
Fibre Channel Receiver	SAS-2 Link Extension
Use Scenario: Front-end signal conditioning in 4x Fibre Channel (4.25 Gbps) host bus adapters and storage controllers. IC Role / Device Role / Timing Role: Input-stage equalizer recovering degraded eye diagrams from long internal traces or midplane connectors. Use Value: Restores vertical eye opening by ≥8 dB, improving margin for clock-data recovery circuits.	Use Scenario: Signal integrity enhancement in 6-Gbps SAS-2 expanders handling mixed-length drive connections. IC Role / Device Role / Timing Role: Rate-adaptive equalizer supporting both 3.0-Gbps and 6.0-Gbps modes with identical layout. Use Value: Maintains <30 ps_p-p deterministic jitter across data rates, ensuring SAS-2 compliance without firmware tuning.

Backplane Interconnect

Rack-to-Rack Interconnect

Use Scenario: Receiving 4.25-Gbps serial data across 24–36 inch FR4 striplines in telecom switch fabric blades.

IC Role / Device Role / Timing Role: Fixed-gain limiting equalizer restoring signal amplitude and reducing deterministic jitter before CDR input.

Use Value: Enables use of cost-effective FR4 instead of expensive low-loss laminates while maintaining BER < 10^–12.

Use Scenario: Extending high-speed links between adjacent equipment racks using CX4 copper cables up to 30 feet.

IC Role / Device Role / Timing Role: Cable equalizer compensating frequency-dependent loss and ensuring full-swing CML output for downstream receivers.

Use Value: Eliminates need for active repeaters or optical conversion, lowering system power and latency.

Fibre Channel Receiver

SAS-2 Link Extension

Use Scenario: Front-end signal conditioning in 4x Fibre Channel (4.25 Gbps) host bus adapters and storage controllers.

IC Role / Device Role / Timing Role: Input-stage equalizer recovering degraded eye diagrams from long internal traces or midplane connectors.

Use Value: Restores vertical eye opening by ≥8 dB, improving margin for clock-data recovery circuits.

Use Scenario: Signal integrity enhancement in 6-Gbps SAS-2 expanders handling mixed-length drive connections.

IC Role / Device Role / Timing Role: Rate-adaptive equalizer supporting both 3.0-Gbps and 6.0-Gbps modes with identical layout.

Use Value: Maintains <30 ps_p-p deterministic jitter across data rates, ensuring SAS-2 compliance without firmware tuning.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed equalizer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3801ETJ+	Wider bandwidth (up to 10 Gbps), higher supply current (65 mA), requires dual 3.3-V/2.5-V supplies	Targeted at 10-Gbps SONET/SDH systems; not optimized for 4.25-Gbps FR4 loss profiles	Select when scaling beyond 4.25 Gbps or needing programmable gain; avoid if single-supply and low-power are mandatory
DS100BR111SQ/NOPB	Retiming capability, integrated CDR, higher power (75 mA), 2.5-V supply only	Designed for PCIe Gen2/3 and SATA applications with jitter cleanup; adds latency (~3 ns)	Choose when deterministic jitter must be actively cleaned-not just compensated-and retiming is acceptable

Compared with MAX3801ETJ+ and DS100BR111SQ/NOPB, the TLK4211EARGT offers lower power, simpler single-supply operation, and fixed equalization precisely tuned for 4.25-Gbps FR4/cable loss-making it optimal for cost-sensitive, latency-critical backplane receivers where retiming is unnecessary.

Availability

TLK4211EARGT is available at Aetrix Electronics and suitable for backplane interconnect, rack-to-rack cabling, Fibre Channel receivers, and SAS-2 link extension requiring stable component supply and long-term industrial lifecycle support.

Supply support for TLK4211EARGT 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 TLK4211EARGT belongs to TI's high-speed interface portfolio, engineered specifically for passive equalization in lossy copper-based serial data links up to 4.25 Gbps-prioritizing low latency, low power, and minimal external components.

FAQ

What is the primary function of the TLK4211EARGT in a high-speed data link?

The TLK4211EARGT functions as a fixed-gain limiting equalizer that compensates for frequency-dependent loss in copper interconnects. It restores signal integrity by providing 12 dB of high-frequency boost at 2.1 GHz, enabling reliable 4.25-Gbps data recovery over up to 30 inches of FR4 PCB trace or 30 feet of CX4 cable. Its role is strictly analog signal conditioning-no retiming or protocol awareness-making it ideal for low-latency, low-power receiver front-ends in the TLK4211EARGT application space.

Does the TLK4211EARGT require configuration or programming to operate?

No, the TLK4211EARGT is a fully autonomous analog device with no digital configuration interface. It operates immediately upon power-up with fixed equalization characteristics optimized for 4.25-Gbps channels. Control pins (DISABLE and OUTPOL) accept simple CMOS logic levels but do not alter equalization parameters. All functionality-including gain, bandwidth, and offset cancellation-is hardwired, eliminating firmware dependencies and ensuring deterministic behavior in the TLK4211EARGT implementation.

Can the TLK4211EARGT be used with 3.3-Gbps protocols like SAS-1 or Fibre Channel 2x?

Yes, the TLK4211EARGT supports multi-rate operation including 1.0625 Gbps, 2.125 Gbps, and 3.3 Gbps, in addition to its primary 4.25-Gbps target. Its fixed equalization profile remains effective across these rates, and typical deterministic jitter remains ≤25 ps_p-p at 3.3 Gbps over 48-inch FR4. This makes the TLK4211EARGT suitable for legacy and mixed-rate systems where a single component must handle multiple standards-without reconfiguration-within the TLK4211EARGT specification envelope.

What is the purpose of the COC1 and COC2 pins on the TLK4211EARGT?

The COC1 and COC2 pins provide access to the internal offset cancellation loop filter node. Connecting an external capacitor (e.g., 0.22 µF) between them extends the low-frequency cutoff from 10 kHz down to ~0.8 kHz, improving baseline wander correction for long-run AC-coupled links. Leaving them open uses the internal capacitor only. Shorting COC1 and COC2 disables the offset cancellation loop entirely-a valid option when DC balance is maintained externally. This flexibility is documented in the TLK4211EARGT datasheet Figure 1 and Application Information section.

Is the TLK4211EARGT pin-compatible with other devices in the TLK4211 family?

Yes, all TLK4211 variants-including TLK4211EA, TLK4211EARGT, and TLK4211EARGTT-share identical pinout, package (RGT QFN-16), and electrical interface per TI SLLS655 datasheet. Differences are limited to ordering suffixes (tape-and-reel vs. tray), packaging materials (RoHS status), and product lifecycle status (NRND/OBSOLETE). Therefore, the TLK4211EARGT can be substituted for other TLK4211EA-marked variants in existing layouts without modification, provided thermal and supply design margins accommodate the TLK4211EARGT's 38-mA maximum current draw.

TLK4211EARGT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Applications:: -

Interface:: -

Voltage - Supply:: -

Supplier Device Package:: -

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Qualification:: -

Mounting Type:: -

TLK4211EARGT FAQ

1.How can I place an order for TLK4211EARGT through Aetrix?

Please submit a Request for Quotation (RFQ) for TLK4211EARGT 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 TLK4211EARGT reliable?

The price and inventory of TLK4211EARGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLK4211EARGT is usually 5 days.

3.What payment methods are accepted for TLK4211EARGT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLK4211EARGT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLK4211EARGT?

TLK4211EARGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLK4211EARGT 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 TLK4211EARGT?

For technical support, including TLK4211EARGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLK4211EARGT requirements.

6.How does Aetrix verify that TLK4211EARGT is sourced from the original manufacturer or authorized distributors?

All TLK4211EARGT 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 TLK4211EARGT meets industry standards.

7.What is the process for return or replacement of TLK4211EARGT?

All TLK4211EARGT units undergo pre-shipment inspection (PSI). If there is an issue with TLK4211EARGT, 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 TLK4211EARGT part is unused and in its original packaging.

Return procedure for TLK4211EARGT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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