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Texas Instruments ONET2501PARGTR
- Part No.:
- ONET2501PARGTR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
ONET2501PARGTR.pdf
- Description:
- IC LIMITING 1 CIRCUIT 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,760
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Product details
Overview
ONET2501PARGTR from Texas Instruments is a 2.5-Gbps high-speed limiting amplifier with integrated loss-of-signal (LOS) detection and receive signal strength indicator (RSSI), designed for fiber-optic receiver front-ends in SONET/SDH, Fibre Channel, and Gigabit Ethernet systems. It delivers 50 dB gain, supports input signals from 3 mVp−p to 1200 mVp−p, operates on a single 3.3-V supply, and uses a 3 mm × 3 mm 16-pin QFN package.
For engineers reviewing the ONET2501PARGTR datasheet, ONET2501PARGTR pinout, ONET2501PARGTR application, or ONET2501PARGTR equivalent, key selection criteria include differential input sensitivity (3 mVp−p), CML output swing (600–1200 mVp−p), LOS threshold programmability via external resistor, RSSI linearity (≤8% error), and −40°C to 85°C industrial temperature operation.
Technical Context
The ONET2501PARGTR implements a three-stage high-speed analog data path with on-chip 50-Ω input termination to VCC and 50-Ω CML output back-termination to VCCO, enabling robust 2.5-Gbps signal conditioning. Its offset cancellation loop-tunable via COC1/COC2 pins-supports low-frequency cutoffs down to 0.8 kHz with external 2.2-nF capacitor or 45 kHz with internal filtering.
LOS detection compares input amplitude against a user-programmable threshold (2–40 mVp−p) set by an external resistor on the TH pin, while RSSI provides a linear analog voltage (100–2800 mV) proportional to input swing. The device integrates bandgap-referenced bias generation and CMOS control logic for OUTPOL polarity inversion and DISABLE-enabled output shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 2.5 Gbps - supports OC48, 2.125-Gbps Fibre Channel, and Gigabit Ethernet physical layer compliance. |
| Input Sensitivity | 3 mVp−p (min) - enables reliable recovery of weak optical signals after PIN/TIA stages. |
| Input Overload | 1200 mVp−p - maintains low jitter and stable limiting even under large-swing transient conditions. |
| Differential Output Swing | 600–1200 mVp−p - meets CML interface requirements for downstream clock-data recovery (CDR) ICs. |
| RSSI Linearity Error | ≤8% - allows accurate real-time monitoring of received optical power without calibration. |
| LOS Hysteresis | 2.5–4.5 dB - prevents false toggling during marginal signal conditions near threshold. |
| Supply Current | 32–40 mA - enables low-power 3.3-V system design with minimal thermal impact in dense optical modules. |
Pinout & Package
The ONET2501PARGTR is housed in a 3 mm × 3 mm, 16-pin QFN package with 0.5-mm pitch and exposed thermal pad (EP) requiring solder connection to ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (pins 1, 4) | Power supply input | 3.3-V ±10% main supply for input stage and bias circuitry; requires local decoupling. |
| DIN+, DIN− (pins 2, 3) | Differential analog input | 50-Ω on-chip termination to VCC; accepts ac-coupled signals from TIAs or photodiodes. |
| TH (pin 5) | Analog input for LOS threshold | Connect external resistor to GND to set programmable LOS assert level (2–40 mVp−p). |
| DISABLE (pin 6) | CMOS control input | High-level assertion disables CML output stage, reducing power and preventing bus contention. |
| LOS (pin 7) | CMOS status output | Active-high open-drain signal indicating input amplitude below programmed threshold. |
| GND (pins 8, 16, EP) | Reference ground | Common return for analog/digital sections; exposed pad must be soldered for thermal performance. |
| OUTPOL (pin 9) | CMOS polarity control | High or floating = normal DOUT+/DOUT− polarity; low = inverted output phase. |
| DOUT−, DOUT+ (pins 10, 11) | CML differential output | 50-Ω on-chip back-termination to VCCO; drives standard CML receivers with 60–85 ps rise/fall times. |
| VCCO (pin 12) | Output-stage supply | Separate 3.3-V supply for CML output buffer; improves PSNR and isolates output noise. |
| RSSI (pin 13) | Analog monitor output | Voltage proportional to input amplitude (100–2800 mV); used for automatic gain control or diagnostics. |
| COC1, COC2 (pins 14, 15) | Offset cancellation filter | Connect external capacitor between pins to extend low-frequency response; shorting disables loop. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RSSI and LOS detection | Eliminates need for external monitoring circuitry; enables real-time link health assessment and fault reporting in SFP/XFP modules. |
| Programmable LOS threshold | Adjustable via single external resistor on TH pin-supports flexible system-level sensitivity tuning across data rates and fiber types. |
| On-chip 50-Ω input/output termination | Reduces external component count and layout complexity; ensures impedance matching without discrete resistors at high frequencies. |
| Output polarity select and disable | Enables dynamic signal inversion for board-level routing optimization and safe power-down sequencing in multi-channel systems. |
| Low-frequency cutoff configurability | Internal 45-kHz cutoff or external 0.8-kHz cutoff via COC1/COC2 capacitor-supports both burst-mode and continuous-mode PON applications. |
Applications
| SONET/SDH OC48 Receivers | Fibre Channel 2.125-Gbps Receivers |
|---|---|
Use Scenario: Front-end limiting amplifier in OC48 (2.488-Gbps) line cards for metro and core transport equipment. IC Role / Device Role / Timing Role: Signal conditioning and amplitude normalization after TIA stage; provides clean, jitter-controlled CML output to CDR. Use Value: 50 dB gain and 1200 mVp−p overload capability ensure robust operation across varying optical power budgets and dispersion-induced waveform distortion. | Use Scenario: Embedded receiver in Fibre Channel HBAs and storage switches operating at 2.125 Gbps. IC Role / Device Role / Timing Role: High-fidelity amplification of differential data from optical transceivers; RSSI supports link quality diagnostics per FC-AL protocol. Use Value: RSSI linearity ≤8% and programmable LOS enable precise optical power margining and predictive maintenance in enterprise storage networks. |
| Gigabit Ethernet PHY Receivers | PON ONU Optical Receivers |
Use Scenario: Receive path in 1000BASE-X SFP modules compliant with IEEE 802.3z. IC Role / Device Role / Timing Role: Limiting amplifier interfacing between PIN diode/TIA and serializer; CML outputs drive FPGA or PHY ASIC inputs. Use Value: Single 3.3-V supply and 32–40 mA ICC simplify power architecture; 60–85 ps edge rates meet IEEE jitter budget for 1.25-Gbps operation. | Use Scenario: Downstream receiver in GPON/EPON optical network units where burst-mode sensitivity and fast LOS response are critical. IC Role / Device Role / Timing Role: Amplifier with sub-100 µs LOS deassert time and configurable low-frequency response for dynamic upstream/downstream switching. Use Value: 2–100 µs LOS timing and COC1/COC2 programmability allow adaptation to variable burst lengths and inter-burst guard times in TDMA PON systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3748AETE+ | Higher max data rate (3.2 Gbps); lower input sensitivity (4 mVp−p); no RSSI output. | Lacks integrated RSSI; requires external ADC or comparator for signal strength monitoring. | Select when higher bandwidth is required and RSSI functionality is implemented externally. |
| SY88303BLMG | Wider input range (2–1000 mVp−p); fixed 3.3-V supply only; no COC filter configuration. | Fixed low-frequency response (no external capacitor option); simpler biasing but less flexible for burst-mode use. | Select for cost-sensitive, fixed-rate applications where adjustable low-frequency cutoff is unnecessary. |
Compared with MAX3748AETE+ and SY88303BLMG, the ONET2501PARGTR uniquely combines RSSI monitoring, programmable LOS threshold, and configurable offset cancellation-making it optimal for diagnostic-rich, multi-rate optical modules requiring field-serviceable link health visibility.
Availability
ONET2501PARGTR is available at Aetrix Electronics and suitable for SONET/SDH OC48 line cards, Fibre Channel 2.125-Gbps storage interfaces, and Gigabit Ethernet SFP modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ONET2501PARGTR 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, communications, and automotive markets.
The ONET2501PARGTR belongs to TI's Optical Networking amplifier product line, engineered specifically for high-speed fiber-optic receiver front-ends requiring low-jitter amplification, integrated diagnostics, and compact packaging in telecom and datacom modules.
FAQ
What is the minimum input signal level supported by the ONET2501PARGTR?
The ONET2501PARGTR supports a minimum differential input signal of 3 mVp−p at BER < 10−10, enabling reliable amplification of weak signals from low-gain TIAs or long-haul optical links. This sensitivity is achieved through its 50-dB gain architecture and internal offset cancellation, ensuring full output swing even at the lowest valid input levels specified in the SLLS602 datasheet.
Does the ONET2501PARGTR require external termination resistors on its input or output pins?
No, the ONET2501PARGTR integrates 50-Ω on-chip termination to VCC on DIN+/DIN− and 50-Ω back-termination to VCCO on DOUT+/DOUT−, eliminating the need for external resistors. This simplifies PCB layout, reduces component count, and maintains impedance integrity up to 2.5 Gbps-confirmed by TI's recommended application circuit in Figure 3 of the SLLS602 datasheet.
How is the loss-of-signal (LOS) threshold configured on the ONET2501PARGTR?
The LOS threshold is configured using an external resistor connected between the TH pin and GND. This resistor sets the assert level within a 2–40 mVp−p range, allowing system designers to tailor sensitivity to specific optical power margins and fiber types. The relationship between resistance value and threshold is defined in the SLLS602 datasheet's "LOS Threshold Adjustment" section.
Can the ONET2501PARGTR operate at data rates below 155 Mbps?
Yes, the ONET2501PARGTR supports multi-rate operation from 155 Mbps up to 2.5 Gbps, including intermediate rates like 622 Mbps (OC12) and 1.0625 Gbps (1× Fibre Channel). Its low-frequency cutoff is configurable down to 0.8 kHz via external COC1/COC2 capacitor, ensuring stable DC-coupled behavior across all supported rates without signal droop.
What is the purpose of the COC1 and COC2 pins on the ONET2501PARGTR?
The COC1 and COC2 pins provide access to the internal offset cancellation loop filter node. Connecting an external capacitor between them extends the low-frequency −3-dB bandwidth from 45 kHz (internal) to as low as 0.8 kHz-critical for burst-mode PON receivers. Shorting COC1 and COC2 disables the loop entirely, which may be used in fixed-gain, non-burst applications where offset drift is not a concern.
ONET2501PARGTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Limiting
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 45 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 32mA
- Current - Output / Channel:
- 25 mA
- 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)
ONET2501PARGTR FAQ
1.How can I place an order for ONET2501PARGTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ONET2501PARGTR 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 ONET2501PARGTR reliable?
The price and inventory of ONET2501PARGTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ONET2501PARGTR is usually 5 days.
3.What payment methods are accepted for ONET2501PARGTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ONET2501PARGTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ONET2501PARGTR?
ONET2501PARGTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ONET2501PARGTR 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 ONET2501PARGTR?
For technical support, including ONET2501PARGTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ONET2501PARGTR requirements.
6.How does Aetrix verify that ONET2501PARGTR is sourced from the original manufacturer or authorized distributors?
All ONET2501PARGTR 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 ONET2501PARGTR meets industry standards.
7.What is the process for return or replacement of ONET2501PARGTR?
All ONET2501PARGTR units undergo pre-shipment inspection (PSI). If there is an issue with ONET2501PARGTR, 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 ONET2501PARGTR part is unused and in its original packaging.
Return procedure for ONET2501PARGTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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