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Texas Instruments ONET3301PARGT
- Part No.:
- ONET3301PARGT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
ONET3301PARGT.pdf
- Description:
- IC LIMITING 1 CIRCUIT 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,656
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Product details
Overview
ONET3301PARGT from Texas Instruments is a 3.3-Gbps high-speed limiting amplifier with integrated loss-of-signal (LOS) detection and received 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 dissipates only 106 mW typical.
For engineers reviewing the ONET3301PARGT datasheet, ONET3301PARGT pinout, ONET3301PARGT application, or ONET3301PARGT equivalent, key selection criteria include its CML output compatibility, programmable LOS threshold via external resistor, RSSI linearity (±3% over 20-dB input range), differential input/output termination, and −40°C to 85°C industrial temperature rating.
Technical Context
The ONET3301PARGT 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. Its offset cancellation loop-tunable via COC1/COC2 pins-enables stable operation down to 45 kHz low-frequency cutoff (extendable to 0.8 kHz with external capacitor).
LOS detection uses an externally adjustable threshold (2–40 mVp−p) referenced to TH pin, while RSSI provides a linear analog voltage (100–2800 mV) proportional to input amplitude. The device integrates a bandgap reference and bias generation block, eliminating need for external references or precision current sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | Up to 3.3 Gbps - supports OC48, 2.125-Gbps Fibre Channel, and 1.0625-Gbps Fibre Channel links. |
| Input sensitivity | 3 mVp−p (min) at BER < 10−10 - enables reliable detection of weak optical signals after photodiode amplification. |
| Input overload | 1200 mVp−p - maintains low-jitter output even under large-swing transient conditions. |
| Power consumption | 106 mW typical - reduces thermal load and simplifies board-level power delivery in dense optical modules. |
| Output swing | 600–1200 mVp−p differential - ensures robust CML logic level compatibility with downstream clock/data recovery ICs. |
| RSSI linearity | ±3% (20-dB input range) - enables accurate real-time optical power monitoring without calibration lookup tables. |
| LOS hysteresis | 2.5–4.5 dB - prevents false toggling during marginal signal conditions near threshold. |
Pinout & Package
The ONET3301PARGT is housed in a 3 mm × 3 mm, 16-pin QFN package with 0.5-mm pitch and exposed thermal pad (EP) connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (pins 1, 4) | Supply | 3.3-V ±10% main supply for input and gain stages; requires local decoupling. |
| DIN+, DIN− (pins 2, 3) | Analog input | Differential data inputs with internal 50-Ω termination to VCC - eliminates need for external resistors in AC-coupled interfaces. |
| TH (pin 5) | Analog input | Programmable LOS threshold node - connect external resistor to GND to set detection level between 2 and 40 mVp−p. |
| DISABLE (pin 6) | CMOS input | Active-high output disable control - asserts high-Z CML outputs within 20 ns for power gating or channel muting. |
| LOS (pin 7) | CMOS output | Open-drain status flag indicating input amplitude below TH threshold - compatible with 3.3-V logic monitoring. |
| GND (pins 8, 16, EP) | Supply | Signal and thermal ground reference; exposed pad must be soldered to PCB ground plane for thermal and EMI performance. |
| OUTPOL (pin 9) | CMOS input | Polarity select - high or open = normal DOUT+/DOUT− phase; low = inverted output phase for signal alignment. |
| DOUT−, DOUT+ (pins 10, 11) | CML output | Differential CML data outputs with internal 50-Ω back-termination to VCCO - directly drives 50-Ω transmission lines. |
| VCCO (pin 12) | Supply | 3.3-V ±10% dedicated supply for CML output stage - allows independent noise isolation from input supply. |
| RSSI (pin 13) | Analog output | Linear voltage output (100–2800 mV) proportional to log-scale input amplitude - used for automatic gain control or link health diagnostics. |
| COC1, COC2 (pins 14, 15) | Analog | Offset cancellation filter nodes - connect external capacitor (e.g., 2.2 nF) between them to extend low-frequency response to 0.8 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RSSI and LOS detection | Eliminates need for separate monitoring ICs and external comparators in optical receiver designs. |
| Programmable LOS threshold | Adjustable 2–40 mVp−p detection window via single external resistor - supports diverse photodiode/transimpedance amplifier combinations. |
| CML-compatible I/O with on-chip termination | Reduces BOM count and layout complexity by integrating 50-Ω input and output terminations. |
| Offset cancellation with external filter tuning | Enables stable DC-coupled operation or configurable low-frequency cutoff (45 kHz base, down to 0.8 kHz with capacitor). |
| Single 3.3-V supply operation | Simplifies power architecture versus dual-supply alternatives - VCC and VCCO are both 3.3 V but electrically isolated for noise separation. |
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 telecom transport equipment. IC Role / Device Role / Timing Role: Converts low-amplitude differential current from TIA into full-swing CML data stream with deterministic jitter < 30 psp−p at 2.5 Gbps. Use Value: Enables compliance with GR-253-CORE jitter transfer and jitter tolerance requirements through low-noise 50-dB gain and 180-µVRMS input-referred noise. | Use Scenario: Signal conditioning stage in 2.125-Gbps Fibre Channel host bus adapters and storage controllers. IC Role / Device Role / Timing Role: Provides gain, signal limiting, and RSSI-based link quality feedback for auto-negotiation and fault reporting. Use Value: RSSI linearity (±3%) and programmable LOS allow precise optical power margining across varying SFP module types and aging characteristics. |
| Gigabit Ethernet 1.25-Gbps Receivers | Optical Network Test Equipment |
Use Scenario: Data recovery front-end in enterprise switches and media converters compliant with IEEE 802.3z. IC Role / Device Role / Timing Role: Amplifies and limits 1.25-Gbps NRZ signals from PIN diodes, delivering clean CML outputs to CDR ICs. Use Value: Input dynamic range (3–1200 mVp−p) accommodates wide variations in optical power budgets without manual gain adjustment. | Use Scenario: Signal integrity test fixture in bit-error-rate testers (BERTs) and optical eye diagram analyzers. IC Role / Device Role / Timing Role: High-fidelity limiting stage for characterizing jitter, amplitude noise, and frequency response of optical transceivers. Use Value: Low deterministic jitter (7.8 psp−p at 2.1 Gbps) and flat 3-dB bandwidth support accurate measurement of transmitter impairments. |
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 (4.25 Gbps); RSSI not integrated; requires external LOS comparator. | Better suited for 4G Fibre Channel; lacks built-in RSSI for optical power monitoring. | Select when >3.3-Gbps margin is required and system already includes RSSI/LOS monitoring circuitry. |
| SY88303BLMG | Lower power (75 mW); no offset cancellation loop; fixed 50-kHz low-frequency cutoff. | Targeted at cost-sensitive 1–2.5-Gbps applications where DC stability is less critical. | Choose for simplified design where external COC filtering is unnecessary and power budget is tighter. |
Compared with MAX3748AETE+ and SY88303BLMG, the ONET3301PARGT uniquely combines integrated RSSI, programmable LOS, and tunable offset cancellation in a 3.3-Gbps solution - enabling compact, self-monitoring optical receivers without external analog support components.
Availability
ONET3301PARGT is available at Aetrix Electronics and suitable for SONET/SDH OC48 line cards, Fibre Channel 2.125-Gbps storage interfaces, and Gigabit Ethernet optical transceivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ONET3301PARGT 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, automotive, and communications markets.
The ONET3301PARGT belongs to TI's Optical Networking product line, engineered specifically for high-speed fiber-optic receiver front-ends where low jitter, wide input dynamic range, and integrated signal monitoring are essential.
FAQ
What is the minimum input signal amplitude supported by the ONET3301PARGT?
The ONET3301PARGT supports a minimum input signal amplitude of 3 mVp−p at BER < 10−10, verified per the SLLS603 datasheet. This sensitivity enables reliable operation with low-output photodiodes and high-gain transimpedance amplifiers. The ONET3301PARGT achieves this using a 50-dB gain architecture and input offset cancellation, ensuring full output swing even at sub-5-mV levels.
Does the ONET3301PARGT require external termination resistors on its differential inputs?
No, the ONET3301PARGT does not require external termination resistors on DIN+ and DIN−. It integrates two 50-Ω on-chip terminations referenced to VCC, supporting direct AC-coupled connection to standard 100-Ω differential transmission lines. This feature reduces PCB area and component count, and is confirmed in the "high-speed data path" section of the SLLS603 datasheet.
How is the loss-of-signal (LOS) threshold configured on the ONET3301PARGT?
The LOS threshold on the ONET3301PARGT is configured using an external resistor connected between the TH pin and GND. Per the datasheet, this resistor sets the detection level within a 2–40 mVp−p range, allowing system-level tuning for different optical power budgets. The ONET3301PARGT's internal circuit compares input amplitude against this threshold and asserts the LOS pin accordingly.
Can the ONET3301PARGT operate with separate input and output supply domains?
Yes, the ONET3301PARGT supports separate supply domains: VCC (pins 1, 4) powers the input and gain stages, while VCCO (pin 12) powers the CML output stage. Both accept 3.3-V ±10%, but physical separation allows independent decoupling and noise isolation - a design feature explicitly documented in the "package" and "dc electrical characteristics" sections of the SLLS603 datasheet.
What is the function of the COC1 and COC2 pins on the ONET3301PARGT?
The COC1 and COC2 pins on the ONET3301PARGT provide access to the internal offset cancellation loop filter. Connecting an external capacitor (e.g., 2.2 nF) between them extends the low-frequency −3-dB bandwidth from 45 kHz down to 0.8 kHz. Leaving them unconnected maintains the base 45-kHz cutoff. This configuration is detailed in the "high-speed data path" section of the SLLS603 datasheet.
ONET3301PARGT 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)
ONET3301PARGT FAQ
1.How can I place an order for ONET3301PARGT through Aetrix?
Please submit a Request for Quotation (RFQ) for ONET3301PARGT 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 ONET3301PARGT reliable?
The price and inventory of ONET3301PARGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ONET3301PARGT is usually 5 days.
3.What payment methods are accepted for ONET3301PARGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ONET3301PARGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ONET3301PARGT?
ONET3301PARGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ONET3301PARGT 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 ONET3301PARGT?
For technical support, including ONET3301PARGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ONET3301PARGT requirements.
6.How does Aetrix verify that ONET3301PARGT is sourced from the original manufacturer or authorized distributors?
All ONET3301PARGT 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 ONET3301PARGT meets industry standards.
7.What is the process for return or replacement of ONET3301PARGT?
All ONET3301PARGT units undergo pre-shipment inspection (PSI). If there is an issue with ONET3301PARGT, 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 ONET3301PARGT part is unused and in its original packaging.
Return procedure for ONET3301PARGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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