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Texas Instruments ONET2501PARGT
- Part No.:
- ONET2501PARGT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
ONET2501PARGT.pdf
- Description:
- IC LIMITING 1 CIRCUIT 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,872
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Product details
Overview
ONET2501PARGT from Texas Instruments is a high-speed limiting amplifier IC for fiber optic receiver front-ends, delivering 50 dB gain, 2.5 Gbps data rate support, 3–1200 mVp−p input dynamic range, and CML differential outputs. It operates on a single 3.3-V supply and targets SONET/SDH OC48, Fibre Channel 2.125-Gbps, and Gigabit Ethernet receivers.
For engineers reviewing the ONET2501PARGT datasheet, ONET2501PARGT pinout, ONET2501PARGT application, or ONET2501PARGT equivalent, key selection considerations include input sensitivity (3 mVp−p), RSSI linearity (±3%), LOS threshold programmability via TH pin, and QFN-16 package compatibility with high-density optical module layouts.
Technical Context
The ONET2501PARGT implements a three-stage high-speed analog signal path with on-chip 50-Ω input termination to VCC and 50-Ω CML output back-termination to VCCO. Its offset cancellation loop-tunable via COC1/COC2 pins-supports low-frequency cutoffs down to 0.8 kHz with external capacitance.
Loss-of-signal detection uses an externally adjustable threshold (5–40 mVp−p) set by resistor RTH on the TH pin, while RSSI provides a linear analog voltage (100–2800 mV) proportional to input amplitude across 2–80 mVp−p, enabling real-time signal health monitoring in optical links.
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 timing. |
| Input Sensitivity | 3 mVp−p (min) - enables reliable operation with ultra-low-amplitude signals from long-haul or attenuated fiber links. |
| Input Dynamic Range | 3–1200 mVp−p - maintains low jitter (<30 psp−p DJ at 2.5 Gbps) even under severe overdrive conditions. |
| Gain | ~50 dB - ensures full CML output swing (600–1200 mVp−p) from minimal input signals without external amplification. |
| Supply Voltage | 3.3 V ±10% - compatible with standard optical module power rails; separate VCC/VCCO pins isolate input/output bias domains. |
| RSSI Linearity | ±3% (20-dB input range) - delivers accurate analog representation of received optical power for closed-loop AGC or diagnostics. |
| LOS Threshold Range | 5–40 mVp−p - configurable via external resistor on TH pin to match system-level signal degradation margins. |
Pinout & Package
The ONET2501PARGT is housed in a 3 mm × 3 mm, 16-pin QFN package with 0.5-mm pitch and exposed thermal pad (EP) requiring PCB grounding for thermal and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (pins 1, 4) | Supply input | 3.3-V ±10% bias for input stage and internal reference; must be decoupled locally. |
| DIN+, DIN− (pins 2, 3) | Differential analog input | 50-Ω on-chip termination to VCC; accepts AC-coupled optical receiver outputs. |
| TH (pin 5) | Analog input | Programs LOS detection threshold via external resistor to GND; sets assert/deassert hysteresis. |
| DISABLE (pin 6) | CMOS control input | High-level assertion disables CML output stage (output goes high-Z), enabling power-gating in burst-mode systems. |
| LOS (pin 7) | CMOS status output | Active-high open-drain flag indicating input signal below programmed threshold; used for link fault reporting. |
| GND (pins 8, 16, EP) | Reference ground | Common return for all circuit blocks; exposed pad (EP) must be soldered to solid ground plane for thermal dissipation. |
| OUTPOL (pin 9) | CMOS polarity control | Selects normal/inverted output polarity; internally pulled up - tie low or leave open for default behavior. |
| DOUT−, DOUT+ (pins 10, 11) | Differential CML output | 50-Ω on-chip back-termination to VCCO; delivers rail-to-rail swing into 50-Ω loads for clock/data recovery ICs. |
| VCCO (pin 12) | Output supply | 3.3-V ±10% dedicated supply for CML output stage; independent from VCC to reduce crosstalk. |
| RSSI (pin 13) | Analog monitor output | Voltage proportional to input amplitude (100–2800 mV); drives high-impedance ADC or comparator inputs. |
| COC1, COC2 (pins 14, 15) | Offset cancellation filter | Connect external capacitor between pins to extend low-frequency response; shorting disables loop for DC-coupled use. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-rate operation | Supports 155 Mbps to 2.5 Gbps without reconfiguration - simplifies design reuse across OC3/OC12/OC48 and Fibre Channel rates. |
| Input offset cancellation | On-chip adaptive loop compensates process/voltage/temperature drift - ensures stable decision threshold at sub-5-mVp−p inputs. |
| Receive Signal Strength Indicator (RSSI) | Linear analog output (±3% error) enables real-time optical power calibration and link margin analysis without external instrumentation. |
| Loss-of-Signal (LOS) detection | Programmable threshold (5–40 mVp−p) with 2.5–4.5 dB hysteresis - prevents false alarms during transient signal dips in noisy environments. |
| CML differential outputs | 600–1200 mVp−p swing with <85 ps rise/fall times - directly interfaces with industry-standard CDR and serializer ICs without level-shifting. |
Applications
| SONET/SDH OC48 Receiver | Fibre Channel 2.125-Gbps Link |
|---|---|
Use Scenario: Long-haul optical transmission node receiving OC48 (2.488 Gbps) signals after dispersion compensation and photodiode conversion. IC Role / Device Role / Timing Role: Limiting amplifier conditioning weak, jitter-prone analog signals prior to clock and data recovery. Use Value: 3 mVp−p sensitivity and 50 dB gain restore signal integrity; RSSI enables automatic gain control feedback for upstream TIA. | Use Scenario: Storage area network switch port receiving 2.125-Gbps Fibre Channel data from optical transceivers. IC Role / Device Role / Timing Role: Front-end signal conditioning block converting photodiode current to clean CML logic levels for SERDES input. Use Value: Programmable LOS threshold adapts to varying link budgets; CML outputs meet FC-PI-3 electrical compliance for interconnect reliability. |
| Gigabit Ethernet SFP Module | Optical Line Card Monitoring |
Use Scenario: Small-form-factor pluggable (SFP) transceiver module supporting 1.25-Gbps Ethernet over multimode fiber. IC Role / Device Role / Timing Role: High-speed analog front-end providing gain, signal detection, and strength monitoring in compact optical subassembly. Use Value: 3 mm × 3 mm QFN footprint fits tight SFP mechanical constraints; DISABLE pin enables low-power standby during link idle periods. | Use Scenario: Central office line card performing real-time health diagnostics on multiple parallel optical channels. IC Role / Device Role / Timing Role: Embedded signal quality monitor generating RSSI and LOS flags for system-level fault isolation and reporting. Use Value: Linear RSSI output (100–2800 mV) feeds microcontroller ADC for quantitative link margin tracking across temperature and aging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3748AETE+ | Higher max data rate (3.2 Gbps); integrated laser driver bias control not present in ONET2501PARGT. | Targeted at combined Tx/Rx modules; lacks RSSI linearity spec (±5% typical vs. ±3% for ONET2501PARGT). | Prefer MAX3748AETE+ when co-integrating laser driver functions; choose ONET2501PARGT for precision RSSI-based diagnostics. |
| SY88303BLMG | Wider input range (2–2000 mVp−p); no COC1/COC2 offset cancellation tuning; fixed 50-kHz low-frequency cutoff. | Optimized for cost-sensitive access networks; missing TH-programmable LOS and OUTPOL polarity select. | Select SY88303BLMG for simplified layout where offset drift is less critical; retain ONET2501PARGT for programmable threshold and flexible polarity control. |
Compared with MAX3748AETE+ and SY88303BLMG, the ONET2501PARGT offers superior RSSI accuracy and user-adjustable LOS hysteresis, making it preferred for diagnostic-rich optical modules where signal health quantification is essential.
Availability
ONET2501PARGT is available at Aetrix Electronics and suitable for SONET/SDH OC48, Fibre Channel 2.125-Gbps, and Gigabit Ethernet optical receiver designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for ONET2501PARGT 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 connectivity technologies, with leadership in high-speed communications ICs.
The ONET family targets optical networking front-ends, designed specifically for low-jitter, multi-rate limiting amplification in SONET, Fibre Channel, and Ethernet infrastructure equipment.
FAQ
What is the minimum input signal level supported by the ONET2501PARGT?
The ONET2501PARGT supports a minimum differential input signal of 3 mVp−p at BER < 10−10, verified per its datasheet's DC electrical characteristics table. This sensitivity allows the ONET2501PARGT to reliably amplify signals from long-distance or highly attenuated fiber links without external pre-amplification, maintaining full 50 dB gain and low-jitter performance.
How does the ONET2501PARGT implement loss-of-signal detection?
The ONET2501PARGT implements loss-of-signal detection using an internal comparator that monitors input amplitude against a user-programmable threshold set by an external resistor on the TH pin. The LOS pin asserts high when the input falls below the configured level (5–40 mVp−p), with 2.5–4.5 dB hysteresis to prevent chatter. This function is fully independent of the main data path and operates across all supported data rates from 155 Mbps to 2.5 Gbps.
Can the ONET2501PARGT operate with DC-coupled inputs?
Yes - the ONET2501PARGT supports DC-coupled operation by shorting COC1 and COC2 (pins 14 and 15), which disables the internal offset cancellation loop. When used this way, the device retains full gain and bandwidth but requires careful attention to input common-mode voltage (0.5–4 V) and DC balance. For AC-coupled designs - the most common configuration - COC1 and COC2 remain open to enable adaptive offset correction.
What is the purpose of the separate VCC and VCCO supply pins on the ONET2501PARGT?
The ONET2501PARGT uses separate VCC (pins 1, 4) and VCCO (pin 12) supplies to isolate the input-stage biasing from the CML output stage. This separation minimizes supply-induced crosstalk and improves power supply noise rejection (26 dB for f < 2 MHz), ensuring stable gain and low deterministic jitter. Both supplies require 3.3 V ±10% and must be independently decoupled near their respective pins to maintain signal integrity at 2.5 Gbps.
Does the ONET2501PARGT provide polarity inversion capability, and how is it controlled?
Yes - the ONET2501PARGT includes output polarity inversion controlled by the OUTPOL pin (pin 9). When OUTPOL is held low, the DOUT+ and DOUT− outputs swap logical states relative to DIN+ and DIN−; when left open or driven high, normal polarity is maintained. This feature eliminates the need for external trace swapping in PCB layout and supports flexible integration with downstream CDR or FPGA I/O banks requiring inverted data alignment.
ONET2501PARGT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Bulk
- 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)
ONET2501PARGT FAQ
1.How can I place an order for ONET2501PARGT through Aetrix?
Please submit a Request for Quotation (RFQ) for ONET2501PARGT 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 ONET2501PARGT reliable?
The price and inventory of ONET2501PARGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ONET2501PARGT is usually 5 days.
3.What payment methods are accepted for ONET2501PARGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ONET2501PARGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ONET2501PARGT?
ONET2501PARGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ONET2501PARGT 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 ONET2501PARGT?
For technical support, including ONET2501PARGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ONET2501PARGT requirements.
6.How does Aetrix verify that ONET2501PARGT is sourced from the original manufacturer or authorized distributors?
All ONET2501PARGT 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 ONET2501PARGT meets industry standards.
7.What is the process for return or replacement of ONET2501PARGT?
All ONET2501PARGT units undergo pre-shipment inspection (PSI). If there is an issue with ONET2501PARGT, 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 ONET2501PARGT part is unused and in its original packaging.
Return procedure for ONET2501PARGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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