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Texas Instruments ONET8501PBRGTRG4
- Part No.:
- ONET8501PBRGTRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
ONET8501PBRGTRG4.pdf
- Description:
- IC LIMITING 1 CIRCUIT 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,021
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Product details
Overview
ONET8501PBRGTRG4 from Texas Instruments is a 11.3-Gbps rate-selectable limiting amplifier with CML outputs, 3.3-V single-supply operation, and integrated 50-Ω back-termination. It delivers 34-dB gain, digitally adjustable output amplitude (350/650/850 mVpp), and programmable preemphasis for optical receiver front-ends in SFP+ and XFP modules.
For engineers reviewing the ONET8501PBRGTRG4 datasheet, ONET8501PBRGTRG4 pinout, ONET8501PBRGTRG4 application, or ONET8501PBRGTRG4 equivalent, key selection criteria include its 2-wire digital interface for bandwidth/LOS/threshold control, 16-pin VQFN package with exposed thermal pad, and support for PRBS31 BER < 10⁻¹² at 5–9 mVpp input sensitivity.
Technical Context
The ONET8501PBRGTRG4 implements a high-speed analog data path with digitally controlled input filter bandwidth (2.4–9 GHz via RATE0/RATE1 pins or registers), offset cancellation loop (COC1/COC2 pins), and dual-peak LOS detection with 7-bit programmable threshold (15–80 mVpp). Its gain stage provides fixed 34-dB small-signal gain with differential 100-Ω input termination.
Control logic uses I²C-compatible 2-wire interface (SDA/SCK) to configure 12 registers-including AMP[1:0] for output amplitude, PEADJ[3:0] for 1-dB-step preemphasis, THADJ[7:0] for input slice level, and LOSRNG bit to select low/high LOS range-enabling precise adaptation to varying signal integrity conditions across fiber channel and Ethernet links.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 11.3 Gbps - supports 10GbE, 8x FC, OC-192/SDH-64 compliance |
| Small-Signal Gain | 34 dB - ensures full CML swing from ≥20 mVpp inputs |
| Input Sensitivity | 5 mVpp (PRBS31, BER < 10⁻¹² at 11.3 Gbps) - enables low-amplitude optical signal recovery |
| Output Amplitude | 350 / 650 / 850 mVpp - selectable via register AMP[1:0] to match downstream CDR input requirements |
| Preemphasis Range | 0–8 dB in 1-dB steps - compensates for frequency-dependent loss in PCB traces or connectors |
| LOS Threshold Range | 15–35 mVpp (low range) or 35–80 mVpp (high range) - configurable via LOSRNG bit and 7-bit registers |
| Supply Voltage | 3.3 V ±10% - single rail simplifies power design; typical current draw 63 mA |
Pinout & Package
ONET8501PBRGTRG4 is housed in a RoHS-compliant 3.00 mm × 3.00 mm, 16-pin VQFN package with exposed thermal pad (EP) requiring solder connection to ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN+, DIN− | Differential analog input | 100-Ω internally terminated pair accepting AC-coupled signals from TIA or photodiode |
| DOUT+, DOUT− | CML differential output | On-chip 50-Ω back-termination to VCC enables direct connection to CDR without external resistors |
| DIS | Digital input | Active-high output disable; reduces power and prevents false triggering during initialization |
| LOS | Open-drain MOS output | Asserts high when input falls below programmed threshold; requires external 10-kΩ pullup to VCC |
| RATE0, RATE1 | Digital input | Select one of four default bandwidth settings (2.4–9 GHz); unused pins auto-bias to select RSD register |
| SDA, SCK | I²C interface inputs | Support read/write access to 12 internal registers for full configuration of gain, timing, and monitoring functions |
| COC1, COC2 | Analog filter terminals | Connect external capacitor (e.g., 330 pF) to set low-frequency cutoff down to 10 kHz for DC-coupled applications |
| VCC (pins 9, 12) | Power supply | 3.3-V main supply; dual pins reduce IR drop and improve PSRR |
| GND (pins 1, 4, EP) | Ground reference | Three ground connections including exposed pad ensure low-inductance return path for RF signals |
Key Features
| Feature | Design Value |
|---|---|
| Digitally selectable bandwidth | Four hardware-selectable defaults (2.4–9 GHz) plus 16 software-configurable settings via registers RSA–RSD |
| Adjustable LOS threshold | 128-step resolution per range (low/high) with hysteresis control to prevent chatter near decision boundary |
| Input offset cancellation | DC feedback loop with external COC capacitor option enables stable operation with sub-10-mVpp inputs and pulse-width distortion compensation |
| Programmable output preemphasis | 8-dB maximum boost in 1-dB increments directly tunes high-frequency response to match channel loss profile |
| Integrated 50-Ω back-termination | Eliminates need for external termination resistors on DOUT+/DOUT−, reducing BOM count and layout area |
Applications
| 10-Gigabit Ethernet Optical Receivers | 8x Fiber Channel Optical Receivers |
|---|---|
Use Scenario: Front-end limiting amplifier in SFP+ transceivers receiving 10.3125-Gbps NRZ signals from APD-based optical receivers. IC Role / Device Role / Timing Role: Amplifies weak differential current-mode signals from TIAs to full-swing CML levels compatible with CDR ICs. Use Value: 5-mVpp sensitivity and 34-dB gain enable reliable link budget margin; programmable LOS asserts before BER degradation occurs. | Use Scenario: Signal conditioning stage in 8.5-Gbps FC-8x modules where input jitter and amplitude variation require adaptive threshold and bandwidth control. IC Role / Device Role / Timing Role: Limiting amplifier with adjustable input slice level (THADJ[7:0]) and rate-selectable bandwidth to optimize eye opening under varying dispersion conditions. Use Value: 7.6-GHz default bandwidth (RATE1=1, RATE0=1) and 4-mVpp sensitivity at 8.5 Gbps maximize jitter tolerance in multi-mode fiber links. |
| SONET OC-192/SDH-64 Optical Receivers | SFP+ Transceiver Modules |
Use Scenario: High-reliability limiting stage in telecom line cards operating at 9.953-Gbps OC-192 rates over single-mode fiber. IC Role / Device Role / Timing Role: Provides deterministic jitter < 8 pspp at 11.3 Gbps and random jitter < 1 psrms to meet SONET jitter accumulation limits. Use Value: On-chip preemphasis and low 28-ps rise/fall times preserve signal integrity through long backplane traces to clock-data recovery circuits. | Use Scenario: Core amplification element in compact SFP+ modules where thermal management and board space are constrained. IC Role / Device Role / Timing Role: Low-power (63 mA), small-footprint (3×3 mm) limiting amplifier with exposed thermal pad for efficient heat dissipation. Use Value: 170-mW typical power dissipation and RoHS-compliant VQFN package meet MSA thermal and environmental requirements for pluggable optics. |
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 8.5-Gbps bandwidth; no rate-select pins; lower max gain (25 dB); 2.5-V supply only | Targeted at cost-sensitive 8.5-Gbps FC/SATA applications; lacks 11.3-Gbps capability and dual-range LOS | Choose MAX3748AETE+ only if system operates strictly ≤8.5 Gbps and 3.3-V supply is unavailable. |
| LMH0384SQ/NOPB | 11.3-Gbps CDR + limiting amplifier combo; includes clock recovery; higher power (120 mA); 48-pin WQFN | Used where embedded clock recovery is required; not a pure limiting amp-adds latency and complexity | Choose LMH0384SQ/NOPB only when CDR functionality is needed; otherwise ONET8501PBRGTRG4 offers lower power and simpler integration. |
Compared with MAX3748AETE+ and LMH0384SQ/NOPB, ONET8501PBRGTRG4 uniquely balances 11.3-Gbps operation, software-configurable bandwidth/LOS/amplitude, and ultra-low 3×3-mm footprint-making it optimal for space-constrained, multi-rate optical modules requiring fine-grained analog tuning without clock recovery.
Availability
ONET8501PBRGTRG4 is available at Aetrix Electronics and suitable for 10GbE optical receivers, SFP+ transceivers, and SONET OC-192 systems requiring stable component supply, high-volume production readiness, and long-term lifecycle assurance.
Supply support for ONET8501PBRGTRG4 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 ONET8501PBRGTRG4 belongs to TI's ONET family of optical networking ICs, designed specifically for next-generation fiber optic receiver front-ends requiring programmable gain, bandwidth, and signal monitoring in compact, low-power packages.
FAQ
What is the maximum data rate supported by the ONET8501PBRGTRG4?
The ONET8501PBRGTRG4 supports up to 11.3 Gbps, validated with PRBS31 patterns at BER < 10⁻¹². This enables full compliance with 10-Gigabit Ethernet, 8x Fiber Channel, and SONET OC-192/SDH-64 standards. The device maintains deterministic jitter below 8 pspp and random jitter under 1 psrms at this rate, ensuring robust signal integrity in high-speed optical links.
How does the ONET8501PBRGTRG4 implement loss-of-signal (LOS) detection?
The ONET8501PBRGTRG4 uses dual-peak detectors monitoring both input and gain-stage output signals to generate LOS. Its 7-bit programmable threshold supports two ranges: 15–35 mVpp (LOSRNG = 0) or 35–80 mVpp (LOSRNG = 1), with hysteresis of 2–6 dB to prevent false toggling. The open-drain LOS output requires a 10-kΩ pullup to VCC and asserts high when signal amplitude drops below the configured level.
Can the ONET8501PBRGTRG4 operate with different supply voltages?
No-the ONET8501PBRGTRG4 is specified exclusively for 3.3-V ±10% operation (2.95 V to 3.6 V). It integrates an on-chip band-gap reference and bias generation circuitry optimized for this voltage, and absolute maximum ratings prohibit operation outside this range. Attempting to use 2.5 V or 5 V will damage the device or cause functional failure.
What is the purpose of the COC1 and COC2 pins on the ONET8501PBRGTRG4?
COC1 and COC2 form the terminals of an external capacitor used to adjust the low-frequency cutoff of the offset cancellation loop. With the internal 330-pF capacitor, the cutoff is ~10 kHz; adding an external capacitor (e.g., 1–10 nF) lowers it further. Connecting COC1 and COC2 together disables offset cancellation, allowing manual input threshold adjustment via register THADJ[7:0] for pulse-width distortion correction.
Does the ONET8501PBRGTRG4 require external termination resistors on its CML outputs?
No-the ONET8501PBRGTRG4 integrates 50-Ω back-termination to VCC on both DOUT+ and DOUT− pins, eliminating the need for external resistors. This simplifies layout, reduces component count, and ensures consistent impedance matching to standard 50-Ω transmission lines feeding CDR or FPGA inputs. External termination is unnecessary unless driving non-50-Ω loads.
ONET8501PBRGTRG4 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)
ONET8501PBRGTRG4 FAQ
1.How can I place an order for ONET8501PBRGTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ONET8501PBRGTRG4 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 ONET8501PBRGTRG4 reliable?
The price and inventory of ONET8501PBRGTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ONET8501PBRGTRG4 is usually 5 days.
3.What payment methods are accepted for ONET8501PBRGTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ONET8501PBRGTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ONET8501PBRGTRG4?
ONET8501PBRGTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ONET8501PBRGTRG4 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 ONET8501PBRGTRG4?
For technical support, including ONET8501PBRGTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ONET8501PBRGTRG4 requirements.
6.How does Aetrix verify that ONET8501PBRGTRG4 is sourced from the original manufacturer or authorized distributors?
All ONET8501PBRGTRG4 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 ONET8501PBRGTRG4 meets industry standards.
7.What is the process for return or replacement of ONET8501PBRGTRG4?
All ONET8501PBRGTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with ONET8501PBRGTRG4, 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 ONET8501PBRGTRG4 part is unused and in its original packaging.
Return procedure for ONET8501PBRGTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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