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Texas Instruments ONET8501PBRGTT
- Part No.:
- ONET8501PBRGTT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
ONET8501PBRGTT.pdf
- Description:
- IC LIMITING 1 CIRCUIT 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:224
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Product details
Overview
ONET8501PBRGTT from Texas Instruments is a 11.3-Gbps rate-selectable limiting amplifier with CML outputs, 34-dB gain, and digital 2-wire interface control. It features adjustable input bandwidth (2.4–9 GHz), programmable output amplitude (350/650/850 mVpp), and on-chip 50-Ω back-termination to VCC. Used in SFP+ and XFP optical receiver modules for 10-Gigabit Ethernet and Fiber Channel.
For engineers reviewing the ONET8501PBRGTT datasheet, ONET8501PBRGTT pinout, ONET8501PBRGTT application, or ONET8501PBRGTT equivalent, this page delivers verified specifications, validated pin functions, confirmed optical receiver use cases, and two technically documented alternative limiting amplifiers for high-speed serial data recovery design.
Technical Context
The ONET8501PBRGTT implements a digitally controlled high-speed analog signal path with differential 100-Ω input termination, four-rate-selectable input filter stages (via RATE0/RATE1 pins or registers RSA–RSD), and offset cancellation using external COC1/COC2 capacitors. Its gain stage delivers 34 dB small-signal gain with deterministic jitter under 10 pspp at 11.3 Gbps.
Loss-of-signal detection uses dual peak detectors with 7-bit programmable thresholds (15–80 mVpp) across two ranges (LOSRNG=0/1), while the 2-wire I²C-compatible interface (slave address 0x44) enables full register control of preemphasis (0–8 dB), input threshold (8-bit THADJ), and output disable (DIS pin or register bit).
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 differential output swing for inputs as low as 20 mVpp |
| Input Bandwidth | 2.4–9 GHz - selectable via RATE0/RATE1 pins or 4-bit registers (RSA–RSD) |
| Output Amplitude | 350 / 650 / 850 mVpp - set by AMP[1:0] bits; enables optimization for downstream CDR input range |
| LOS Threshold Range | 15–80 mVpp - configurable in two ranges (low/high) with 128-step resolution per range |
| Supply Voltage | 3.3 V ±10% - single supply; typical current draw 63 mA at full operation |
| Deterministic Jitter | <10 pspp at 11.3 Gbps - measured with K28.5 pattern and 30 mVpp input |
| Package | 16-pin VQFN (3 mm × 3 mm) - RoHS-compliant, exposed thermal pad, –40°C to 100°C operating range |
Pinout & Package
ONET8501PBRGTT is housed in a 3.00 mm × 3.00 mm, 16-pin RoHS-compliant VQFN package with exposed thermal pad (EP) tied to GND. The package supports reflow soldering and provides low-inductance grounding via pins 1, 4, and EP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN+ | Analog input (noninverted) | Differentially 100 Ω terminated to DIN–; accepts AC-coupled CML/LVPECL signals down to 5 mVpp |
| DIN– | Analog input (inverted) | Complements DIN+; forms differential pair with 100-Ω internal termination |
| DOUT+ | CML output (noninverted) | On-chip 50-Ω back-termination to VCC; delivers fully differential CML output with 28–40 ps rise/fall time |
| DOUT– | CML output (inverted) | Complements DOUT+; enables direct connection to CDR or FPGA transceiver without external termination |
| DIS | Digital input (active-high) | Disables output stage within 20 ns; reduces output to <5 mVrms for power gating or fault isolation |
| LOS | Open-drain MOS output | Asserts high when input falls below programmed threshold; requires external 10-kΩ pullup to VCC |
| SCK | Digital input (I²C clock) | I²C-compatible clock input; 400 kHz max frequency; internal 100-kΩ pullup to VCC |
| SDA | Digital input/output (I²C data) | Bidirectional I²C data line; open-drain structure; internal 100-kΩ pullup to VCC |
| RATE0 / RATE1 | Digital input (bandwidth select) | Select one of four default bandwidths (2.4/7.6/8.4/9 GHz); unconnected pins default to RATE1=1, RATE0=0 |
| VCC | Power supply | 3.3-V ±10% supply; pins 9 and 12 must be decoupled with 0.1-μF capacitors close to package |
| GND | Ground | Pins 1 and 4 plus exposed pad (EP) must be solidly connected to system ground plane for noise immunity |
| COC1 / COC2 | Analog filter terminals | Connect external capacitor (e.g., 330 pF) between COC1–COC2 to extend low-frequency cutoff to 10 kHz |
Key Features
| Feature | Design Value |
|---|---|
| Digitally selectable input bandwidth | Four hardware-selectable defaults (2.4–9 GHz) plus 16 software-configurable settings via 4-bit registers |
| Programmable output preemphasis | 0–8 dB in 1-dB steps (PEADJ[3:0]) compensates for channel loss up to ~15 dB at Nyquist |
| Adjustable LOS detection threshold | Two 7-bit ranges (15–35 mVpp or 35–80 mVpp) enable precise signal-loss detection across data rates |
| Input offset cancellation | External COC1/COC2 capacitor pair reduces DC offset drift; disable via OCDIS bit for manual threshold tuning |
| CML outputs with on-chip termination | Integrated 50-Ω back-termination to VCC eliminates need for external resistors and saves PCB space |
| Low-power 3.3-V operation | Typical 63 mA supply current at 11.3 Gbps; <170 mW total dissipation enables dense optical module layouts |
Applications
| 10-Gigabit Ethernet Optical Receiver | Fiber Channel 8x/10x Optical Receiver |
|---|---|
|
Use Scenario: Front-end limiting amplifier in SFP+ pluggable transceivers receiving 10.3125-Gbps serial data over single-mode fiber. IC Role / Device Role / Timing Role: Amplifies weak photodiode current-derived differential signal to full-swing CML level for CDR input; provides LOS indication for link status monitoring. Use Value: Enables reliable signal recovery at –12 dBm optical input power with <10 pspp deterministic jitter, meeting IEEE 802.3ae requirements. |
Use Scenario: Signal conditioning stage in XFP modules for 8.5-Gbps or 10.51875-Gbps Fiber Channel links. IC Role / Device Role / Timing Role: Limits and reshapes degraded high-speed serial data after TIA; supplies programmable bandwidth to match FC-PI-4/FC-PI-5 data rates. Use Value: Supports multi-rate operation via RATE0/RATE1 pins; 7.6 GHz default bandwidth optimized for 8.5-Gbps FC with 4 mVpp sensitivity. |
| SONET OC-192/SDH-64 Optical Receiver | SFP+ Transceiver Module |
|
Use Scenario: High-reliability limiting stage in telecom-grade line cards processing 9.95328-Gbps SONET OC-192 signals. IC Role / Device Role / Timing Role: Provides stable gain and low-jitter amplification across –40°C to 100°C industrial temperature range; LOS output feeds system alarm logic. Use Value: Guaranteed operation at 100°C junction temperature; deterministic jitter ≤8 pspp ensures compliance with GR-253-CORE timing budgets. |
Use Scenario: Core limiting amplifier in compact SFP+ modules where board space and thermal management are critical. IC Role / Device Role / Timing Role: Delivers 350/650/850 mVpp output amplitude options to match varying CDR input sensitivity; DIS pin enables hot-plug power sequencing. Use Value: 3-mm × 3-mm VQFN footprint reduces module size; on-chip 50-Ω termination eliminates two external resistors per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3982AETE+ | Fixed 10.3-Gbps bandwidth; no RATE pin control; 3.3-V supply; 30-dB gain; 600-mVpp output | Lacks digital bandwidth/LOS/preemphasis programming; suited for fixed-rate legacy designs | Select when simplicity and cost outweigh programmability needs; verify 10.3-Gbps BER performance matches system margin |
| LMH0384SQ/NOPB | 11-Gbps CDR + limiting amplifier combo; integrated clock recovery; 2.5-V supply; 40-dB gain | Replaces separate CDR + LA; higher integration but larger 48-pin WQFN package and different supply domain | Choose when clock recovery is required on-board; confirm 2.5-V supply compatibility and evaluate added latency vs. discrete LA+CDR |
Compared with MAX3982AETE+ and LMH0384SQ/NOPB, ONET8501PBRGTT uniquely combines rate-selectable bandwidth, 7-bit LOS threshold resolution, and 3.3-V CML output termination in a 3-mm QFN-enabling flexible, space-constrained optical receiver designs without sacrificing configurability.
Availability
ONET8501PBRGTT is available at Aetrix Electronics and suitable for 10-Gigabit Ethernet optical receivers, Fiber Channel transceivers, and SONET OC-192 line cards requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ONET8501PBRGTT 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 delivering analog and embedded processing solutions, with leadership in high-speed interface ICs and optical communication components.
The ONET8501PBRGTT belongs to TI's ONET family of optical networking ICs, designed specifically for high-bandwidth, low-jitter signal conditioning in fiber-optic receiver modules compliant with SFP+, XFP, and MSA standards.
FAQ
What is the maximum supported data rate for ONET8501PBRGTT?
The ONET8501PBRGTT supports up to 11.3 Gbps with PRBS31 pattern at BER < 10⁻¹² and 5 mVpp input sensitivity. Its 9-GHz default bandwidth (RATE1=1, RATE0=0) and 34-dB gain ensure full-swing output even at minimum input levels. Performance is characterized across –40°C to 100°C and validated per IEEE 802.3ae and FC-PI-4 standards.
How does the ONET8501PBRGTT implement loss-of-signal detection?
The ONET8501PBRGTT uses dual peak detectors monitoring both input and gain-stage output signals. LOS assertion is programmable across two 7-bit ranges (15–35 mVpp or 35–80 mVpp) via the LOSRNG bit and registers LOSA–LOSD. Assert/deassert times are 2.5–80 µs, with hysteresis of 2–6 dB to prevent chatter near threshold.
Can ONET8501PBRGTT operate with only the RATE pins, or is the I²C interface required?
ONET8501PBRGTT operates fully with RATE0/RATE1 pins alone-selecting one of four default bandwidths and LOS thresholds. The I²C interface (SDA/SCK) is optional and used only when customizing bandwidth, preemphasis, output amplitude, or input threshold beyond the hardware defaults. Unconnected RATE pins default to RATE1=1, RATE0=0.
What is the purpose of the COC1 and COC2 pins on ONET8501PBRGTT?
COC1 and COC2 form the terminals of an external capacitor that sets the low-frequency cutoff of the offset cancellation loop. A 330-pF capacitor yields ~10 kHz cutoff; larger values extend it further. Connecting COC1 and COC2 together disables offset cancellation, enabling manual input threshold adjustment via register THADJ[7:0] for pulse-width distortion compensation.
Does ONET8501PBRGTT require external termination resistors on its CML outputs?
No. ONET8501PBRGTT 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 maintains signal integrity-provided VCC is well-decoupled with 0.1-μF capacitors placed near pins 9 and 12.
ONET8501PBRGTT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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)
ONET8501PBRGTT FAQ
1.How can I place an order for ONET8501PBRGTT through Aetrix?
Please submit a Request for Quotation (RFQ) for ONET8501PBRGTT 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 ONET8501PBRGTT reliable?
The price and inventory of ONET8501PBRGTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ONET8501PBRGTT is usually 5 days.
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ONET8501PBRGTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ONET8501PBRGTT 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 ONET8501PBRGTT?
For technical support, including ONET8501PBRGTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ONET8501PBRGTT requirements.
6.How does Aetrix verify that ONET8501PBRGTT is sourced from the original manufacturer or authorized distributors?
All ONET8501PBRGTT 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 ONET8501PBRGTT meets industry standards.
7.What is the process for return or replacement of ONET8501PBRGTT?
All ONET8501PBRGTT units undergo pre-shipment inspection (PSI). If there is an issue with ONET8501PBRGTT, 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 ONET8501PBRGTT part is unused and in its original packaging.
Return procedure for ONET8501PBRGTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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