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Texas Instruments ONET4201PARGTR
- Part No.:
- ONET4201PARGTR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
ONET4201PARGTR.pdf
- Description:
- IC LIMITING 1 CIRCUIT 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,299
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Product details
Overview
ONET4201PARGTR from Texas Instruments is a 3.3-V, 155 Mbps to 4.25 Gbps high-speed limiting amplifier with integrated loss-of-signal (LOS) detection and receive signal strength indicator (RSSI). It delivers ~50 dB gain, supports differential CML outputs, and operates across –40°C to 85°C for fiber optic receiver applications in SONET/SDH, Fibre Channel, and Gigabit Ethernet.
For engineers reviewing the ONET4201PARGTR datasheet, ONET4201PARGTR pinout, ONET4201PARGTR application, or ONET4201PARGTR equivalent, this device offers verified multi-rate operation up to 4.25 Gbps, input sensitivity down to 3 mVp-p, 89 mW typical power consumption, and configurable LOS threshold via external resistor - critical for optical link budget design and signal integrity validation.
Technical Context
The ONET4201PARGTR implements a three-stage high-speed gain path with on-chip 50-Ω input termination to VCC and 50-Ω CML output back-termination. Its offset cancellation loop enables stable operation with input signals as low as 3 mVp-p, while internal bandgap reference ensures bias stability across temperature.
LOS detection uses an externally programmable threshold (via TH pin and RTH), with assert/deassert hysteresis of 2.5–4.5 dB; RSSI provides linear analog voltage output (200–1900 mV) proportional to input amplitude over 8–80 mVp-p, supporting real-time link health monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | Up to 4.25 Gbps - supports OC-48 FEC, 4.25 Gbps Fibre Channel, and Gigabit Ethernet physical layer receivers. |
| Input sensitivity | 3 mVp-p (min) at BER < 10−10 - enables reliable detection of weak optical signals after long-haul fiber transmission. |
| Input overload | 1200 mVp-p (max) - maintains low-jitter output even under strong signal conditions, reducing need for front-end attenuation. |
| Power consumption | 89 mW typical at 3.3 V - reduces thermal load in dense optical module designs and simplifies power delivery. |
| Output jitter | ≤35 psp-p deterministic jitter at 2.125 Gbps - meets stringent eye-opening requirements for serial data recovery. |
| RSSI linearity | ±3% over 8–80 mVp-p input - allows accurate received power estimation without calibration per unit. |
| LOS hysteresis | 2.5–4.5 dB - prevents false toggling during marginal signal conditions near threshold. |
Pinout & Package
ONET4201PARGTR is housed in a 3-mm × 3-mm, 16-pin QFN package (RGT) with 0.5-mm pitch and exposed thermal pad (EP) requiring PCB grounding. The package supports high-density optical module layouts and efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pins 1, 4, 12) | Supply input | 3.3-V ±10% main power rail; three pins reduce IR drop and improve high-frequency decoupling. |
| DIN+, DIN− (Pins 2, 3) | Differential analog input | 50-Ω on-chip termination to VCC; accepts AC-coupled signals from transimpedance amplifier (TIA) output. |
| TH (Pin 5) | Analog input | Connects external resistor to GND to set LOS assert voltage (e.g., 2.5 kΩ → ~10 mVp-p). |
| DISABLE (Pin 6) | CMOS control input | Active-high logic disables CML output stage within 20 ns - enables power gating during idle periods. |
| LOS (Pin 7) | CMOS output | Open-drain output indicating signal loss; high when input falls below programmed threshold. |
| GND (Pins 8, 16, EP) | Ground reference | Primary return path; exposed pad must be soldered to solid ground plane for thermal and noise performance. |
| OUTPOL (Pin 9) | CMOS control input | Selects output polarity: open/high = normal, low = inverted - eliminates need for external inversion logic. |
| DOUT−, DOUT+ (Pins 10, 11) | Differential CML output | 50-Ω on-chip back-termination to VCC; drives AC-coupled clock/data recovery (CDR) or FPGA SERDES inputs. |
| RSSI (Pin 13) | Analog output | Linear voltage output (200–1900 mV) proportional to log-scale input amplitude - used for digital diagnostics or AGC feedback. |
| COC1, COC2 (Pins 14, 15) | Analog filter terminals | Connect external capacitor between them to extend offset cancellation loop low-frequency cutoff below 25 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-rate limiting amplification | Operates continuously from 155 Mbps (OC3) to 4.25 Gbps (OC-48/Fibre Channel) without reconfiguration - simplifies platform reuse across legacy and next-gen optical interfaces. |
| Integrated RSSI and LOS | Single-chip replaces discrete monitoring circuitry; RSSI output enables closed-loop optical power control, while LOS provides fail-safe link status to host controller. |
| On-chip 50-Ω terminations | Eliminates four external resistors per channel (input/output), reducing BOM count, board area, and impedance mismatch risk in high-speed layouts. |
| Offset cancellation with external filter option | Compensates for DC drift over temperature/time; optional COC capacitor extends low-frequency response for burst-mode or low-duty-cycle signals. |
| Polarity select and output disable | Hardware-configurable polarity avoids layout-level signal inversion; fast-disable (20 ns) supports dynamic power management in energy-aware modules. |
Applications
| SONET/SDH OC-48 FEC Receivers | Fibre Channel 4.25 Gbps Receivers |
|---|---|
|
Use Scenario: Long-haul telecom line cards receiving OC-48 (2.488 Gbps) or OC-48 FEC (4.25 Gbps) signals over single-mode fiber. IC Role / Device Role / Timing Role: Limiting amplifier stage following TIA; restores full-amplitude CML data for downstream clock recovery and deserialization. Use Value: 50 dB gain and 1200 mVp-p overload tolerance maintain clean eye opening despite wide dynamic range of received optical power. |
Use Scenario: Storage area network (SAN) switch ports interfacing with 4.25 Gbps Fibre Channel transceivers. IC Role / Device Role / Timing Role: Signal conditioning block in FC-PI-4 compliant receiver path; provides deterministic jitter <35 psp-p at 4.25 Gbps. Use Value: Integrated RSSI enables real-time link quality reporting to FC fabric manager; LOS flag triggers automatic failover without host software intervention. |
| Gigabit Ethernet SFP Receivers | Multi-Rate Optical Transceiver Modules |
|
Use Scenario: Small Form-factor Pluggable (SFP) modules converting optical 1.25 Gbps Ethernet signals to electrical CML for MAC interface. IC Role / Device Role / Timing Role: Final analog signal conditioner before SERDES; provides 3 mVp-p sensitivity to support budget-limited passive optical networks. Use Value: Single 3.3-V supply and 89 mW power enable compact, thermally constrained SFP housings; pin compatibility with ONET2501PA/ONET3301PA eases family migration. |
Use Scenario: Reconfigurable optical modules supporting multiple protocols (SONET, Fibre Channel, Ethernet) via firmware-controlled rate selection. IC Role / Device Role / Timing Role: Universal limiting amplifier core enabling hardware-shared receiver architecture across data rates from 155 Mbps to 4.25 Gbps. Use Value: No external gain-setting components required; multi-rate operation eliminates need for separate ICs per standard, reducing inventory and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ONET2501PARGTR | Lower max data rate (2.5 Gbps); identical pinout, package, and feature set except reduced bandwidth and RSSI range. | Suitable for OC-48 non-FEC or 2.125 Gbps Fibre Channel only; not rated for 4.25 Gbps operation. | Select when system data rate ≤2.5 Gbps and cost optimization is prioritized over future-proofing. |
| MAX3761ETA+ | Higher power (120 mW), no integrated RSSI, requires external 50-Ω terminations; 3.3-V CML output compatible. | Lacks on-chip signal monitoring functions; requires additional ADC or comparator for LOS/RSSI functionality. | Choose if RSSI/LOS are handled elsewhere in system, or when TI part availability constraints require second-source evaluation. |
Compared with ONET2501PARGTR, the ONET4201PARGTR enables higher-speed protocols without layout change; versus MAX3761ETA+, it integrates monitoring features and reduces external component count, lowering total solution size and validation effort.
Availability
ONET4201PARGTR is available at Aetrix Electronics and suitable for SONET/SDH line cards, Fibre Channel storage switches, and Gigabit Ethernet SFP modules requiring stable component supply across extended product lifecycles.
Supply support for ONET4201PARGTR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.
The ONET4201PARGTR belongs to TI's ONET high-speed optical receiver IC family, engineered specifically for fiber-optic communication systems requiring low-jitter, multi-rate limiting amplification with integrated diagnostics.
FAQ
What data rates does the ONET4201PARGTR support?
The ONET4201PARGTR supports continuous multi-rate operation from 155 Mbps up to 4.25 Gbps, covering OC-3 through OC-48 FEC SONET/SDH, 1.0625/2.125/4.25 Gbps Fibre Channel, and Gigabit Ethernet. Its gain stage and CML output are characterized across this full range without mode switching or configuration changes - making ONET4201PARGTR ideal for protocol-agnostic optical receiver designs.
Does the ONET4201PARGTR require external termination resistors?
No, the ONET4201PARGTR includes on-chip 50-Ω terminations for both differential inputs (DIN+/DIN−) and outputs (DOUT+/DOUT−), referenced to VCC. This eliminates four external surface-mount resistors per channel, reducing PCB area, BOM cost, and potential impedance discontinuities - a key advantage of ONET4201PARGTR in space-constrained optical modules.
How is loss-of-signal (LOS) detection configured on the ONET4201PARGTR?
LOS detection on the ONET4201PARGTR is configured by connecting an external resistor (RTH) between the TH pin and GND. The assert voltage (VAST) scales inversely with RTH; for example, 2.5 kΩ yields ~10 mVp-p. The ONET4201PARGTR also provides hysteresis (2.5–4.5 dB) to prevent chatter near threshold - a critical behavior confirmed in the ONET4201PARGTR datasheet's AC electrical characteristics table.
What is the function of the COC1 and COC2 pins on the ONET4201PARGTR?
The COC1 and COC2 pins on the ONET4201PARGTR form the external connection points for an optional capacitor that extends the low-frequency cutoff of the internal offset cancellation loop. With COC pins open, the cutoff is ~25 kHz; adding a 0.54 µF capacitor lowers it to ~0.8 kHz. This capability allows ONET4201PARGTR to maintain DC stability in burst-mode or low-duty-cycle optical links where baseline wander would otherwise degrade performance.
Is the ONET4201PARGTR pin-compatible with other devices in the ONET family?
Yes, the ONET4201PARGTR is explicitly documented as pin-compatible with the ONET2501PA and ONET3301PA in the same 3-mm × 3-mm QFN package. This enables drop-in upgrades from lower-speed variants without PCB redesign - a verified interoperability statement found in the ONET4201PARGTR datasheet's "Features" section and confirmed in the package diagram.
ONET4201PARGTR 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:
- Differential
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 25 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 35mA
- Current - Output / Channel:
- -
- 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)
ONET4201PARGTR FAQ
1.How can I place an order for ONET4201PARGTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ONET4201PARGTR 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 ONET4201PARGTR reliable?
The price and inventory of ONET4201PARGTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ONET4201PARGTR is usually 5 days.
3.What payment methods are accepted for ONET4201PARGTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ONET4201PARGTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ONET4201PARGTR?
ONET4201PARGTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ONET4201PARGTR 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 ONET4201PARGTR?
For technical support, including ONET4201PARGTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ONET4201PARGTR requirements.
6.How does Aetrix verify that ONET4201PARGTR is sourced from the original manufacturer or authorized distributors?
All ONET4201PARGTR 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 ONET4201PARGTR meets industry standards.
7.What is the process for return or replacement of ONET4201PARGTR?
All ONET4201PARGTR units undergo pre-shipment inspection (PSI). If there is an issue with ONET4201PARGTR, 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 ONET4201PARGTR part is unused and in its original packaging.
Return procedure for ONET4201PARGTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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