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Texas Instruments ONET4201PARGTT
- Part No.:
- ONET4201PARGTT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
ONET4201PARGTT.pdf
- Description:
- IC LIMITING 1 CIRCUIT 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:114
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Product details
Overview
ONET4201PARGTT from Texas Instruments is a 3.3-V, 155 Mbps to 4.25 Gbps high-speed limiting amplifier with integrated loss-of-signal (LOS) detection and receive signal strength indicator (RSSI). It delivers ~50 dB gain, supports CML differential outputs, and operates across –40°C to 85°C for fiber optic receiver front-ends in Fibre Channel and Gigabit Ethernet systems.
For engineers reviewing the ONET4201PARGTT datasheet, ONET4201PARGTT pinout, ONET4201PARGTT application, or ONET4201PARGTT equivalent, key selection criteria include input sensitivity (3 mVp-p), output swing (520–1200 mVp-p), deterministic jitter (≤35 psp-p at 2.125 Gbps), RSSI linearity (±3%), and LOS threshold programmability via external resistor.
Technical Context
The ONET4201PARGTT implements a three-stage high-speed data path with on-chip 50-Ω input termination to VCC and CML output back-termination, enabling stable operation over 25 kHz to 4.25 GHz bandwidth. Its offset cancellation loop ensures reliable amplification down to 3 mVp-p inputs, while internal bias generation maintains performance across temperature and supply variation.
LOS detection compares input amplitude against a user-programmable threshold (via TH pin and RTH = 1.2–6.8 kΩ), asserting LOS when signal falls below VAST (2–10 mVp-p). RSSI provides an analog voltage (200–1900 mV) linearly proportional to input swing (8–80 mVp-p) with ±3% accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | Up to 4.25 Gbps - supports OC-48, 4× Fibre Channel, and 1000BASE-X applications. |
| Input sensitivity | 3 mVp-p (BER < 10−10) - enables detection of weak optical signals after long-haul transmission. |
| Input overload | 1200 mVp-p - accommodates large-swing signals without clipping or excessive jitter. |
| Differential output swing | 520–760 mVp-p - matches standard CML logic levels for direct interfacing with clock/data recovery ICs. |
| Power consumption | 35–45 mA at 3.3 V (89 mW typical) - suitable for dense, thermally constrained optical modules. |
| RSSI linearity | ±3% over 8–80 mVp-p input - enables accurate real-time link health monitoring in SFP+ and XFP transceivers. |
| LOS hysteresis | 2.5–4.5 dB - prevents false toggling during marginal signal conditions near threshold. |
Pinout & Package
The ONET4201PARGTT is housed in a 3-mm × 3-mm, 16-pin VQFN (RGT) package with 0.5-mm pitch and exposed thermal pad (EP), optimized for high-frequency signal integrity and thermal dissipation in compact optical modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (pins 1, 4, 12) | Supply input | 3.3-V ±10% power rail; three pins reduce IR drop and improve PSRR in high-speed operation. |
| DIN+, DIN− (pins 2, 3) | Differential analog input | 50-Ω on-chip termination to VCC; accepts AC-coupled NRZ signals from TIAs or photodiodes. |
| TH (pin 5) | Analog input | Connects external resistor to GND to set LOS assert threshold (VAST = 2–10 mVp-p). |
| DISABLE (pin 6) | CMOS control input | Active-high disables CML output stage (20 ns response) for power gating or channel shutdown. |
| LOS (pin 7) | CMOS output | Open-drain or push-pull flag indicating signal loss; compatible with microcontroller interrupt inputs. |
| GND (pins 8, 16, EP) | Ground reference | Three ground connections + exposed pad ensure low-inductance return path for RF and digital currents. |
| OUTPOL (pin 9) | CMOS control input | Selects output polarity (normal/inverted); internally pulled high - leave open for default behavior. |
| DOUT−, DOUT+ (pins 10, 11) | CML differential output | 50-Ω on-chip back-termination to VCC; drives 100-Ω differential traces directly into CDR or FPGA SERDES. |
| RSSI (pin 13) | Analog output | Voltage output (200–1900 mV) proportional to log-scale input amplitude; used for closed-loop gain control or diagnostics. |
| COC1, COC2 (pins 14, 15) | Analog filter terminals | Connect external capacitor between them to extend low-frequency cutoff below 25 kHz for burst-mode or low-rate protocols. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-rate limiting amplifier | Operates from 155 Mbps to 4.25 Gbps without reconfiguration - eliminates need for multiple SKUs in multi-standard optical modules. |
| Integrated RSSI and LOS | Single-chip replaces discrete comparators and ADCs for signal monitoring - reduces BOM count and layout area in SFP/XFP cages. |
| Offset cancellation | Compensates internal DC offsets to maintain BER < 10−10 at 3 mVp-p input - critical for low-power PON and passive optical networks. |
| CML-compatible I/O | On-chip 50-Ω terminations eliminate external resistors - simplifies layout, improves impedance matching, and reduces jitter at 4.25 Gbps. |
| Low-power 3.3-V operation | 89 mW typical consumption - enables integration into space-constrained, fanless optical transceivers with thermal budgets under 1 W. |
Applications
| Fibre Channel Receiver | Gigabit Ethernet Receiver |
|---|---|
Use Scenario: Front-end amplification in 1.0625/2.125/4.25 Gbps Fibre Channel receivers within storage area networks. IC Role / Device Role / Timing Role: Limiting amplifier conditioning post-TIA analog signal before CDR sampling. Use Value: 50 dB gain and 35 psp-p deterministic jitter at 2.125 Gbps ensure compliance with FC-PI-3 eye mask requirements. | Use Scenario: Signal recovery in 1000BASE-X optical transceivers for enterprise switches and routers. IC Role / Device Role / Timing Role: High-fidelity limiting stage converting weak photodiode current to clean CML logic for PHY interface. Use Value: 3 mVp-p sensitivity and RSSI feedback enable auto-gain control and link fault isolation per IEEE 802.3z. |
| SONET/SDH OC-48 FEC System | Optical Transceiver Diagnostic Monitoring |
Use Scenario: Data recovery in OC-48 (2.488 Gbps) SONET/SDH line cards with forward error correction. IC Role / Device Role / Timing Role: Post-amplifier in receiver path ensuring jitter accumulation remains below ITU-T G.957 limits. Use Value: Low input-referred noise (230 µVRMS) and 4.5 dB LOS hysteresis prevent false alarms during FEC burst-error correction windows. | Use Scenario: Real-time optical link health monitoring in SFP+ and XFP pluggable modules. IC Role / Device Role / Timing Role: Analog telemetry source providing RSSI voltage and LOS flag to host microcontroller via I²C or GPIO. Use Value: ±3% RSSI linearity and programmable LOS threshold support SFF-8472 digital diagnostics implementation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ONET2501PA | Lower max data rate (2.5 Gbps), identical pinout and 3.3-V supply; no RSSI output. | Suitable for OC-48 and 2.125 Gbps Fibre Channel only; lacks signal-strength telemetry. | Select when RSSI is unnecessary and cost optimization is prioritized for sub-3 Gbps links. |
| MAX3765 | Pin-incompatible; 3.3-V, 4.25 Gbps limiting amp with RSSI but no LOS output; higher 125 mW power draw. | Used in telecom line cards requiring RSSI-only monitoring; requires PCB redesign due to different pin assignment. | Choose when LOS flag is not required and board layout allows for alternate footprint and higher thermal load. |
Compared with ONET2501PA and MAX3765, the ONET4201PARGTT uniquely combines full 4.25 Gbps capability, integrated LOS + RSSI, and pin compatibility with legacy ONET2501PA/ONET3301PA designs - enabling drop-in upgrades in existing optical module platforms without layout changes.
Availability
ONET4201PARGTT is available at Aetrix Electronics and suitable for Fibre Channel receivers, Gigabit Ethernet optical interfaces, and SONET/SDH OC-48 FEC systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ONET4201PARGTT 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 company specializing in analog, embedded processing, and high-speed interface solutions for communications, industrial, and automotive markets.
The ONET4201PARGTT belongs to TI's ONET family of optical networking ICs, designed specifically for high-performance, low-power limiting amplification in fiber-optic receiver modules compliant with SONET, SDH, Fibre Channel, and Ethernet standards.
FAQ
What is the minimum input signal level supported by the ONET4201PARGTT?
The ONET4201PARGTT supports a minimum differential input voltage of 3 mVp-p at BER < 10−10, enabled by its offset cancellation circuitry and 50 dB gain. This sensitivity allows the ONET4201PARGTT to reliably recover signals from low-output photodiodes or after significant fiber attenuation, making it suitable for long-reach PON and metro optical links where signal integrity is marginal.
Does the ONET4201PARGTT require external termination resistors on its CML outputs?
No, the ONET4201PARGTT integrates 50-Ω back-termination to VCC on both DOUT+ and DOUT− pins, eliminating the need for external resistors. This design reduces PCB area, improves impedance matching at 4.25 Gbps, and minimizes reflections that could degrade eye opening - a key advantage of the ONET4201PARGTT in high-density optical module layouts.
How is the loss-of-signal (LOS) threshold configured on the ONET4201PARGTT?
The LOS threshold on the ONET4201PARGTT is set using an external resistor (RTH = 1.2–6.8 kΩ) connected between the TH pin and GND. The resulting assert voltage (VAST) ranges from 2 to 10 mVp-p, with hysteresis of 2.5–4.5 dB. This programmability allows system designers to tune the ONET4201PARGTT's LOS behavior to match specific optical budget margins and noise floor requirements.
Can the ONET4201PARGTT operate with a supply voltage other than 3.3 V?
The ONET4201PARGTT is specified for operation with a 3.3-V ±10% supply (3.0–3.6 V). Operation outside this range is not guaranteed: absolute maximum VCC is 4.0 V, and undervoltage below 3.0 V may cause gain compression, increased jitter, or failure of internal bias circuits. For reliable performance, the ONET4201PARGTT must be powered within its recommended operating conditions.
Is the ONET4201PARGTT pin-compatible with other devices in the ONET family?
Yes, the ONET4201PARGTT is explicitly pin-compatible with the ONET2501PA and ONET3301PA, sharing identical 16-pin QFN (RGT) packaging, pin assignments, and supply requirements. This allows system designers to upgrade data rate capability from 2.5 Gbps or 3.3 Gbps to 4.25 Gbps in existing optical module designs without modifying PCB layout - a documented feature of the ONET4201PARGTT per TI's SLLS652 datasheet.
ONET4201PARGTT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Limiting
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 25 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 35mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 3.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (3x3)
ONET4201PARGTT FAQ
1.How can I place an order for ONET4201PARGTT through Aetrix?
Please submit a Request for Quotation (RFQ) for ONET4201PARGTT 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 ONET4201PARGTT reliable?
The price and inventory of ONET4201PARGTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ONET4201PARGTT is usually 5 days.
3.What payment methods are accepted for ONET4201PARGTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ONET4201PARGTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ONET4201PARGTT?
ONET4201PARGTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ONET4201PARGTT 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 ONET4201PARGTT?
For technical support, including ONET4201PARGTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ONET4201PARGTT requirements.
6.How does Aetrix verify that ONET4201PARGTT is sourced from the original manufacturer or authorized distributors?
All ONET4201PARGTT 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 ONET4201PARGTT meets industry standards.
7.What is the process for return or replacement of ONET4201PARGTT?
All ONET4201PARGTT units undergo pre-shipment inspection (PSI). If there is an issue with ONET4201PARGTT, 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 ONET4201PARGTT part is unused and in its original packaging.
Return procedure for ONET4201PARGTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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