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Texas Instruments ONET8501PBRGTTG4
- Part No.:
- ONET8501PBRGTTG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
ONET8501PBRGTTG4.pdf
- Description:
- IC LIMITING 1 CIRCUIT 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,203
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Product details
Overview
ONET8501PBRGTTG4 from Texas Instruments is a 11.3-Gbps rate-selectable limiting amplifier with CML inputs/outputs, 3.3-V single-supply operation, digitally adjustable bandwidth (2.4–9 GHz), programmable output amplitude (350/650/850 mVpp), and integrated loss-of-signal detection - deployed in SFP+ optical receiver front-ends for 10-Gigabit Ethernet.
For engineers reviewing the ONET8501PBRGTTG4 datasheet, ONET8501PBRGTTG4 pinout, ONET8501PBRGTTG4 application, or ONET8501PBRGTTG4 equivalent, key selection considerations include its 16-pin VQFN package, 2-wire I²C interface for register-based configuration, differential input sensitivity down to 5 mVpp at 11.3 Gbps, on-chip 50-Ω CML back-termination, and LOS hysteresis programmability across two voltage ranges (15–35 mVpp or 35–80 mVpp).
Technical Context
The ONET8501PBRGTTG4 integrates a high-speed analog data path with digitally controlled input bandwidth filtering (via RATE0/RATE1 pins or 4-bit registers), offset cancellation loop (with COC1/COC2 external capacitor support), and dual-peak LOS detection using both input and gain-stage output signals. Its gain stage delivers 34 dB small-signal gain with <30 ps rise/fall times.
Control is implemented via a standard I²C-compatible 2-wire interface (SDA/SCK), supporting full read/write access to 12 registers for configuring input threshold (8-bit), preemphasis (4-bit, 0–8 dB), output amplitude (2-bit), LOS range (LOSRNG), and offset cancellation enable (OCDIS). All digital inputs are CMOS-compatible with internal pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 11.3 Gbps - supports PRBS31 pattern at BER < 10⁻¹² with 5 mVpp input sensitivity. |
| Small-Signal Gain | 34 dB - ensures full CML output swing for low-amplitude inputs (≥20 mVpp differential). |
| Input Sensitivity | 5 mVpp min at 11.3 Gbps - enables reliable reception of attenuated optical signals after photodiode/TIA stages. |
| Output Amplitude | 350 / 650 / 850 mVpp selectable - matches downstream CDR or clock recovery IC input requirements. |
| Bandwidth Range | 2.4–9 GHz - digitally configurable via RATE pins or registers to suppress noise at specific data rates. |
| LOS Threshold Range | 15–80 mVpp in two programmable ranges - allows precise signal-loss detection across varying link budgets. |
| Supply Voltage | 3.3 V ±10% - single-rail operation simplifies power delivery in compact transceiver modules. |
| Power Dissipation | <170 mW typical - enables thermal management in space-constrained SFP+/XFP modules. |
Pinout & Package
ONET8501PBRGTTG4 is housed in a RoHS-compliant 3.00 mm × 3.00 mm, 16-pin VQFN package (RGTT) with exposed thermal pad (EP) requiring solder connection to ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN+, DIN− | Differential analog input | 100-Ω internally terminated pair accepting CML/PECL/LVDS signals; supports input swings from 5 to 2000 mVpp. |
| DOUT+, DOUT− | Differential CML output | On-chip 50-Ω back-termination to VCC enables direct connection to 50-Ω transmission lines without external resistors. |
| VCC (pins 9, 12) | Power supply | 3.3-V main supply; dual pins reduce IR drop and improve PSRR in high-speed operation. |
| GND (pins 1, 4, EP) | Ground reference | Three ground connections including exposed pad ensure low-inductance return path for RF currents and thermal conduction. |
| SDA, SCK | I²C serial interface | Open-drain inputs with internal 100-kΩ pullups; compatible with standard microcontroller GPIOs for register programming. |
| DIS | Digital control input | Active-high output disable; asserts within 20 ns to suppress outputs during hot-plug or fault conditions. |
| LOS | Open-drain status output | Indicates input signal below programmed threshold; requires external 10-kΩ pullup to VCC for logic-level compatibility. |
| RATE0, RATE1 | Hardware bandwidth select | Set default filter bandwidth (2.4–9 GHz); unconnected pins default to RATE1=1, RATE0=0 (9 GHz mode). |
| COC1, COC2 | Offset cancellation filter | External capacitor (e.g., 330 pF) sets low-frequency cutoff (down to 10 kHz); shorting disables DC feedback loop. |
Key Features
| Feature | Design Value |
|---|---|
| Digitally selectable bandwidth | 16 internal filter settings (4-bit) accessible via I²C or 4 default modes via RATE pins - optimizes SNR for 2.125–11.3 Gbps protocols. |
| Programmable output preemphasis | 0–8 dB in 1-dB steps - compensates for high-frequency loss in PCB traces or flex cables feeding downstream CDRs. |
| Adjustable input threshold voltage | 256-level slice adjustment (8-bit THADJ register) - fine-tunes eye crossing to mitigate pulse width distortion in degraded signals. |
| Two-range LOS detection | Configurable assert thresholds (15–35 mVpp or 35–80 mVpp) with 128-step resolution per range - adapts to varying receiver sensitivity across link margins. |
| Integrated offset cancellation | DC feedback loop with external COC capacitor support - maintains baseline stability for ultra-low-amplitude inputs without manual calibration. |
| Low-power CML output stage | <63 mA supply current at 3.3 V - enables dense integration in multi-channel optical modules with minimal thermal impact. |
Applications
| 10-Gigabit Ethernet Optical Receiver | SFP+ Transceiver Module |
|---|---|
|
Use Scenario: Front-end limiting amplifier in 10GBASE-SR/LR optical receivers converting photodiode current to clean CML data stream. IC Role / Device Role / Timing Role: Limiting amplifier conditioning post-TIA analog signal; provides gain, bandwidth control, and LOS monitoring before CDR. Use Value: 5 mVpp sensitivity at 11.3 Gbps enables robust operation with low-responsivity VCSELs or long-reach SMF links. |
Use Scenario: Signal conditioning core in hot-pluggable SFP+ modules compliant with SFF-8431 MSA. IC Role / Device Role / Timing Role: High-speed analog front-end providing programmable gain, LOS flag, and output drive for host-side CDR. Use Value: 2-wire I²C interface allows real-time bandwidth and amplitude tuning during module initialization or link training. |
| Fiber Channel 8x/10x Receiver | SONET OC-192/SDH-64 System |
|
Use Scenario: Data recovery path in 8.5-Gbps or 10.5-Gbps Fiber Channel optical line cards. IC Role / Device Role / Timing Role: Limiting amplifier with rate-selectable bandwidth (7.6–8.4 GHz) matching FC-PI-5/FC-PI-6 standards. Use Value: Programmable LOS hysteresis (2–6 dB) prevents false alarms during burst-mode traffic or transient signal fades. |
Use Scenario: Clock and data recovery front-end in SONET OC-192 (9.953 Gbps) transport equipment. IC Role / Device Role / Timing Role: Amplifier delivering jitter-cleaned CML output to SONET-specific CDRs with deterministic jitter <8 pspp. Use Value: 34 dB gain and <40 ps rise/fall time preserve signal integrity required for SONET's stringent BER and jitter specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3748AETE+ | Fixed 10.3-Gbps bandwidth; no RATE pin hardware selection; 3.3-V supply; 350 mVpp output only. | Limited to fixed-rate systems; lacks multi-range LOS and preemphasis - suitable for cost-sensitive, single-standard designs. | Choose MAX3748AETE+ when I²C configurability is unnecessary and board space permits larger 16-pin TQFN package. |
| LMH0387SQ/NOPB | 11.3-Gbps operation; includes integrated equalization; 2.5-V supply; LVPECL outputs; no built-in LOS detection. | Targets SMPTE video over fiber; requires external LOS circuitry and level-shifting for 3.3-V systems. | Choose LMH0387SQ/NOPB only for HD/3G-SDI video applications where equalization is prioritized over LOS integration. |
Compared with MAX3748AETE+ and LMH0387SQ/NOPB, ONET8501PBRGTTG4 uniquely combines rate-selectable bandwidth, dual-range LOS, and programmable preemphasis in a 3-mm QFN - making it optimal for multi-protocol optical modules requiring field-upgradable performance tuning.
Availability
ONET8501PBRGTTG4 is available at Aetrix Electronics and suitable for 10-Gigabit Ethernet optical receivers, SFP+ transceiver modules, and SONET OC-192 systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for ONET8501PBRGTTG4 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 expertise in high-speed communications ICs.
The ONET8501PBRGTTG4 belongs to TI's ONET family of optical networking amplifiers, designed specifically for next-generation optical receiver front-ends in telecom, datacom, and enterprise infrastructure.
FAQ
What is the maximum data rate supported by the ONET8501PBRGTTG4?
The ONET8501PBRGTTG4 supports up to 11.3 Gbps with PRBS31 pattern and BER < 10⁻¹² at 5 mVpp input sensitivity. It is fully characterized for operation at 2.125 Gbps, 4.25 Gbps, 8.5 Gbps, and 11.3 Gbps, with bandwidth settings optimized per rate via RATE pins or I²C registers. The device maintains <8 pspp deterministic jitter at 11.3 Gbps with 30 mVpp input.
Does the ONET8501PBRGTTG4 require external termination resistors on its CML outputs?
No, the ONET8501PBRGTTG4 includes on-chip 50-Ω back-termination to VCC on both DOUT+ and DOUT− pins, eliminating the need for external resistors when driving 50-Ω transmission lines. This simplifies layout, reduces component count, and improves signal integrity by minimizing stub reflections in high-speed routing.
How is loss-of-signal (LOS) detection configured on the ONET8501PBRGTTG4?
LOS detection on the ONET8501PBRGTTG4 is configurable via I²C register 0 (LOSRNG bit) to select between low-range (15–35 mVpp) or high-range (35–80 mVpp) thresholds, with 128-step resolution per range. Default levels can also be set using RATE0/RATE1 pins. The open-drain LOS output requires an external 10-kΩ pullup to VCC and provides hysteresis of 2–6 dB to prevent chatter.
Can the input bandwidth of the ONET8501PBRGTTG4 be adjusted without using the I²C interface?
Yes, the ONET8501PBRGTTG4 supports hardware-based bandwidth selection using RATE0 and RATE1 pins, offering four default settings: 2.4 GHz (00), 7.6 GHz (01), 8.4 GHz (11), and 9 GHz (10). If left unconnected, RATE1 defaults high and RATE0 defaults low, selecting the 9-GHz mode. Full 16-step adjustment still requires I²C register writes.
What is the purpose of the COC1 and COC2 pins on the ONET8501PBRGTTG4?
COC1 and COC2 pins implement the offset cancellation loop filter. Connecting a capacitor (e.g., 330 pF) between them lowers the low-frequency cutoff to 10 kHz, improving DC stability for very low-frequency signals. Shorting COC1 and COC2 disables the loop, allowing manual input threshold adjustment via register 1 - useful for optimizing eye crossing in distorted waveforms.
ONET8501PBRGTTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Limiting
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 9 GHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 50mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.95 V
- Voltage - Supply Span (Max):
- 3.6 V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (3x3)
ONET8501PBRGTTG4 FAQ
1.How can I place an order for ONET8501PBRGTTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ONET8501PBRGTTG4 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 ONET8501PBRGTTG4 reliable?
The price and inventory of ONET8501PBRGTTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ONET8501PBRGTTG4 is usually 5 days.
3.What payment methods are accepted for ONET8501PBRGTTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ONET8501PBRGTTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ONET8501PBRGTTG4?
ONET8501PBRGTTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ONET8501PBRGTTG4 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 ONET8501PBRGTTG4?
For technical support, including ONET8501PBRGTTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ONET8501PBRGTTG4 requirements.
6.How does Aetrix verify that ONET8501PBRGTTG4 is sourced from the original manufacturer or authorized distributors?
All ONET8501PBRGTTG4 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 ONET8501PBRGTTG4 meets industry standards.
7.What is the process for return or replacement of ONET8501PBRGTTG4?
All ONET8501PBRGTTG4 units undergo pre-shipment inspection (PSI). If there is an issue with ONET8501PBRGTTG4, 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 ONET8501PBRGTTG4 part is unused and in its original packaging.
Return procedure for ONET8501PBRGTTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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