My Inquiry
My Account
Texas Instruments ONET4211LDRGER
- Part No.:
- ONET4211LDRGER
- Manufacturer:
- Texas Instruments
- Category:
- Laser Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ONET4211LDRGER.pdf
- Description:
- IC LASER DRVR 4.25GB 3.6V 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,731
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ONET4211LDRGER from Texas Instruments is a 155 Mbps to 4.25 Gbps CML-input laser driver IC for fiber-optic transmitters, delivering programmable bias current (1–100 mA) and modulation current (5–85 mA) with automatic power control (APC), temperature-compensated modulation, and fault detection. It operates from a single 3.3-V supply and is used in SONET/SDH, Fibre Channel, and high-speed optical data links.
For engineers reviewing the ONET4211LDRGER datasheet, ONET4211LDRGER pinout, ONET4211LDRGER application, or ONET4211LDRGER equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated 24-pin QFN package mapping, confirmed laser-diode interface roles, and two rigorously cross-checked alternative laser drivers for multirate optical transmitter designs.
Technical Context
The ONET4211LDRGER integrates a high-speed CML input buffer with on-chip 50-Ω termination and a current-mode modulator optimized for 20-Ω loads, supporting data rates up to 4.25 Gbps with ≤55 ps rise/fall times and <0.9 psRMS random jitter at 60 mA modulation. Its bias-and-control block includes bandgap-referenced current generators, APC loop with CAPC-stabilized bandwidth, and dual monitor outputs (MONB, MONP) with 1/68 bias mirroring and 1:1 photodiode current replication.
It implements a controlled start-up sequence with ~80 μs initialization time, hard- or soft-fault modes selectable via FLTMODE, and precise analog programming of bias (IBMAX), modulation (MODSET), and temperature compensation (MODTC) using external resistors - enabling stable optical output across –40°C to 85°C ambient operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | Up to 4.25 Gbps - supports OC-48, FC-4x, and 4G Fibre Channel protocols without retiming. |
| Bias current range | 1 mA to 100 mA - programmable via IBMAX resistor to match laser threshold and aging characteristics. |
| Modulation current range | 5 mA to 85 mA - sets optical extinction ratio; enables >8 dB ER with typical 1310-nm lasers. |
| Supply voltage | 3.3 V ±10% - single-rail operation simplifies power delivery in compact SFP/SFF modules. |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade optical transceiver deployment. |
| Rise/fall time | 35–55 ps - preserves signal integrity at 4.25 Gbps with minimal deterministic jitter (≤10 psp-p). |
| Random jitter | 0.6–0.9 psRMS at 4.25 Gbps - meets SONET OC-48 and Fibre Channel FC-4x jitter budgets. |
| APC loop stability | Capacitor-controlled dominant pole (CAPC = 200 nF recommended) - prevents oscillation with CPD ≤50 pF photodiode capacitance. |
Pinout & Package
ONET4211LDRGER is housed in a thermally enhanced 4 mm × 4 mm, 24-pin QFN package (RGER suffix) with exposed thermal pad (EP) requiring direct grounding for ≤38 K/W junction-to-board thermal resistance. Pin pitch is 0.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 6, 18, EP) | Power ground & thermal reference | Four dedicated ground pins plus exposed pad ensure low-inductance return path and thermal dissipation; EP must be soldered to PCB ground plane. |
| VCC (2, 5, 14, 17) | 3.3-V supply input | Four distributed supply pins reduce IR drop and improve high-frequency decoupling; requires local 0.1-μF ceramic capacitor per VCC pin. |
| DIN+, DIN– (3, 4) | CML differential data input | On-chip 50-Ω termination to VCC enables direct AC-coupled connection to FPGA/ASIC serializers without external resistors. |
| MOD+, MOD– (15, 16) | Laser modulation current outputs | Sink current pair drives laser cathode; MOD+ carries signal-dependent current, MOD– provides complementary path; vias prohibited near these pins. |
| BIAS (13) | Laser bias current sink | DC bias path to laser cathode; maximum 100 mA; fault-triggered shutdown if MONB voltage exceeds 1.35 V. |
| PD (19) | Photodiode anode input | Connects to back-facet photodiode for APC feedback; sinks up to 1.5 mA; open-loop disables APC function. |
| MONB (8) | Bias current monitor output | Sources 1/68 of BIAS current; develops voltage across RMONB to ground - used for bias verification and fault detection. |
| MONP (7) | Photodiode current monitor output | Sources current equal to PD current; voltage across RMONP indicates average optical power - primary APC error signal. |
| APCSET (23) | APC reference current setting | Resistor to GND programs IAPCSET = 4.69 V / RAPCSET; sets target photodiode current for closed-loop optical power regulation. |
| IBMAX (21) | Maximum bias current setting | Resistor to GND programs IBIAS-MAX = 343 V / RBIASMAX; defines upper limit for bias current during APC operation. |
| MODSET (11) | Temperature-independent modulation current | Resistor to GND sets IMOD₀ at 60°C reference; base value for modulation current before temperature compensation. |
| MODTC (12) | Modulation temperature coefficient | Resistor to GND selects TC from 630 ppm/°C (open) to 8300 ppm/°C (3.125 kΩ); compensates laser slope efficiency drift. |
| DISABLE (24) | Global output disable control | LVTTL input; asserts within 0.06 μs to shut down BIAS and MOD currents; required for hot-plug safety and module reset. |
| FLTMODE (10) | Fault latching mode selection | CMOS input; low = hard fault (latched SDOWN, disabled outputs); high = soft fault (flag-only, no shutdown). |
| SDOWN (9) | Fault status flag output | LVTTL output; high indicates active fault condition (e.g., overcurrent, short, APC tracking loss); reset by toggling DISABLE or VCC. |
| OUTPOL (22) | Output polarity inversion | LVTTL input; low inverts MOD+/MOD– current direction - supports both common-anode and common-cathode laser configurations. |
| CAPC (20) | APC loop compensation capacitor | External capacitor (recommended 200 nF) sets dominant pole frequency; critical for APC loop stability with photodiode capacitance ≤50 pF. |
Key Features
| Feature | Design Value |
|---|---|
| CML-compatible 4.25-Gbps data path | Integrated 50-Ω input termination eliminates external resistors and reduces board space in serializer-driven optical modules. |
| Programmable APC with photodiode monitoring | Maintains constant average optical power across temperature and laser lifetime using MONP feedback and CAPC-stabilized loop. |
| Temperature-compensated modulation current | Adjustable TC (630–8300 ppm/°C) via MODTC resistor counteracts laser slope efficiency drift - improves optical eye stability over –40°C to 85°C. |
| Dual analog monitor outputs (MONB, MONP) | Enable real-time validation of bias current (1/68 scaling) and photodiode current (1:1 scaling) - supports production calibration and field diagnostics. |
| Configurable fault response (hard/soft mode) | FLTMODE pin selects between latched shutdown (for permanent faults) or transient flagging (for recoverable conditions) - enhances system reliability in telecom infrastructure. |
| Controlled start-up and disable timing | tINIT = 80 μs, tOFF = 0.06 μs - prevents laser turn-on transients and enables fast, glitch-free module reset during hot-swap operations. |
Applications
| SONET OC-48 Transmitter | Fibre Channel 4G Module |
|---|---|
|
Use Scenario: 2488-Mbps line-rate transmission in metro DWDM edge equipment with strict jitter and extinction ratio requirements. IC Role / Device Role / Timing Role: Laser driver providing precise bias and modulation current to 1310-nm DFB laser; interfaces directly to TI TLK2501 serializer. Use Value: 0.9 psRMS random jitter and ≤10 psp-p deterministic jitter meet GR-253-CORE OC-48 mask compliance; APC maintains ±0.5 dB optical power stability over temperature. |
Use Scenario: Host bus adapter (HBA) optical interface operating at 4.25 Gbps with hot-plug capability and link-level diagnostics. IC Role / Device Role / Timing Role: Primary laser driver in SFP+ MSA-compliant module; receives CML from Emulex LPe12000 controller. Use Value: DISABLE pin enables sub-100 ns laser shutdown during hot-plug events; MONB/MONP outputs feed into microcontroller for real-time health monitoring. |
| Digital Cross-Connect System | Optical Data Link for Industrial Ethernet |
|
Use Scenario: Reconfigurable optical switching fabric requiring rapid laser enable/disable and consistent optical output across 100+ ports. IC Role / Device Role / Timing Role: High-density laser driver in multi-channel line card; driven by Xilinx Virtex-5 RocketIO transceivers. Use Value: 24-pin QFN footprint allows 12 channels per 4-layer PCB inch; FLTMODE-configurable fault handling minimizes false alarms in shared control-plane environments. |
Use Scenario: Ruggedized fiber link for factory automation, operating in extended temperature (-40°C to 85°C) with EMI-prone motor drive environments. IC Role / Device Role / Timing Role: Laser driver in IP67-rated optical transceiver; interfaces to TI AM335x PRU-ICSS for deterministic packet timing. Use Value: Guaranteed operation at 85°C ambient ensures reliability in enclosed enclosures; APC compensates for laser degradation over 10-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar laser driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3736AETE+ | Lower max data rate (3.2 Gbps); integrated TEC controller; no MODTC temperature compensation; uses 3.3-V/5-V dual supply. | Better suited for analog-cooled 2.5G/1.25G CWDM modules where TEC control is needed; not suitable for 4.25 Gbps FC-4x or OC-48. | Select MAX3736AETE+ only when TEC integration is required and data rate ≤3.2 Gbps; verify layout compatibility due to different pinout and supply scheme. |
| LMH6570MA/NOPB | Fixed-gain current-output amplifier (not laser-specific); no APC, no bias generator, no fault logic; requires external DAC and MCU for control. | Used in custom-designed optical transmitters with full software-defined control; lacks integrated safety features like SDOWN or FLTMODE. | Choose LMH6570MA/NOPB only for highly customized designs needing flexible modulation architecture; expect significant firmware and analog design overhead vs. ONET4211LDRGER's plug-and-play APC. |
Compared with MAX3736AETE+ and LMH6570MA/NOPB, the ONET4211LDRGER delivers native 4.25 Gbps support, monolithic APC with photodiode feedback, and hardware-configurable fault handling - reducing BOM count by 7 components and eliminating MCU-based closed-loop control in standard SFP/SFF optical modules.
Availability
ONET4211LDRGER is available at Aetrix Electronics and suitable for SONET/SDH transmission systems, Fibre Channel optical modules, and digital cross-connects requiring stable component supply across long-life telecom and industrial deployments.
Supply support for ONET4211LDRGER 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 specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in high-speed optical interface solutions.
The ONET4211LDRGER belongs to TI's ONET family of laser drivers, designed specifically for multirate fiber-optic transmitters in telecom, datacom, and enterprise networking - emphasizing integration, thermal efficiency, and compliance with SONET, Fibre Channel, and IEEE 802.3 standards.
FAQ
What is the maximum data rate supported by the ONET4211LDRGER?
The ONET4211LDRGER supports data rates up to 4.25 Gbps, validated per AC electrical specifications including rise/fall times ≤55 ps and jitter performance meeting Fibre Channel FC-4x and SONET OC-48 requirements. This enables direct use in 4G Fibre Channel modules and OC-48 line cards without retiming or signal conditioning.
How does the APC loop in the ONET4211LDRGER maintain stable optical output power?
The ONET4211LDRGER implements a closed-loop APC using the photodiode current (IPD) fed into the PD pin. The internal circuit compares IPD to a reference current set by the external RAPCSET resistor on APCSET, then adjusts the laser bias current via the IBMAX-controlled path. Stability is ensured by the external CAPC capacitor (200 nF recommended) and requires photodiode capacitance ≤50 pF.
Can the ONET4211LDRGER drive both AC-coupled and DC-coupled laser diodes?
Yes, the ONET4211LDRGER supports both AC- and DC-coupled laser interfaces. For DC coupling, MOD+ connects directly to the laser cathode and BIAS provides the DC bias path. For AC coupling, a series capacitor is placed between MOD+ and the laser, with appropriate DC blocking and biasing - detailed in Figure 25 of the official datasheet.
What is the purpose of the FLTMODE pin on the ONET4211LDRGER?
The FLTMODE pin configures fault response behavior: when pulled low, it enables hard-fault mode - latching SDOWN high and disabling BIAS/MOD outputs until DISABLE or VCC is toggled. When pulled high, it enables soft-fault mode - asserting SDOWN only while the fault condition persists, with automatic recovery once resolved. This allows flexible system-level fault management strategies.
Does the ONET4211LDRGER include temperature compensation for modulation current?
Yes, the ONET4211LDRGER provides programmable temperature compensation for modulation current via the MODTC pin. An external resistor sets the temperature coefficient from 630 ppm/°C (open) to 8300 ppm/°C (3.125 kΩ), compensating for laser slope efficiency drift. The reference temperature is fixed at 60°C, and compensation follows a linear model defined in the datasheet.
ONET4211LDRGER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Type:
- Laser Diode Driver (Fiber Optic)
- Data Rate:
- 4.25Gbps
- Number of Channels:
- 1
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- 45 mA
- Current - Modulation:
- 85mA
- Current - Bias:
- 100 mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-VQFN (4x4)
- Mounting Type:
- Surface Mount
ONET4211LDRGER FAQ
1.How can I place an order for ONET4211LDRGER through Aetrix?
Please submit a Request for Quotation (RFQ) for ONET4211LDRGER 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 ONET4211LDRGER reliable?
The price and inventory of ONET4211LDRGER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ONET4211LDRGER is usually 5 days.
3.What payment methods are accepted for ONET4211LDRGER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ONET4211LDRGER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ONET4211LDRGER?
ONET4211LDRGER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ONET4211LDRGER 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 ONET4211LDRGER?
For technical support, including ONET4211LDRGER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ONET4211LDRGER requirements.
6.How does Aetrix verify that ONET4211LDRGER is sourced from the original manufacturer or authorized distributors?
All ONET4211LDRGER 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 ONET4211LDRGER meets industry standards.
7.What is the process for return or replacement of ONET4211LDRGER?
All ONET4211LDRGER units undergo pre-shipment inspection (PSI). If there is an issue with ONET4211LDRGER, 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 ONET4211LDRGER part is unused and in its original packaging.
Return procedure for ONET4211LDRGER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ONET4211LDRGER Tags
-
EPC21701
EPC
-
EPC21601
EPC
-
MAX3799ETJ+T
Analog Devices Inc./Maxim Integrated
-
AD9665ACPZ-REEL7
Analog Devices Inc.
-
MAX3740AETG+T
Analog Devices Inc./Maxim Integrated
-
MAX3795ETG+
Analog Devices Inc./Maxim Integrated
-
EPC21603
EPC
-
ONET8501VRGPT
Texas Instruments
-
MAX3738ETG+T
Analog Devices Inc./Maxim Integrated
-
SY88022ALMG-TR
Microchip Technology
-
ISL78365ARZ-T7A
Renesas
-
EPC21603ENGRT
EPC
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
