Texas Instruments ONET4251PA Data Sheet
Summary
The ONET4251PA is a high-performance limiting amplifier designed for reliable data communication links up to 4.25 Gbps in both fiber optic and copper cable applications. This technical resource guides users through the device's architecture, detailing advanced functions such as Loss of Signal (LOS) detection and Received Signal Strength Indicator (RSSI). It provides engineers with a compact, low-power solution featuring high input dynamic range, suitable for integrating into next-generation receiver designs, including Gigabit Ethernet systems requiring maximum reliability and performance.
Page 1 Text Content
查询ONET4251PA供应商
ONET4251PA
www.ti.com
SLLS663A–SEPTEMBER 2005–REVISED NOVEMBER
Gbps to 4.25 Gbps Limiting Amplifier With LOS and RSSI
FEATURES Polarity Select
Multi-Rate Operation from Gbps up to Single 3.3-V Supply
4.25 Gbps
Surface Mount Small Footprint 3-mm 3-mm
89-m W Power Consumption 16-Pin QFN Package
Input Offset Cancellation
APPLICATIONS
High Input Dynamic Range
Cable Driver and Receiver•
Output Disable
1.0625 Gbps, 2.125 Gbps, and 4.25 Gbps Fibre
CML Data Outputs
Channel Receivers
Receive Signal Strength Indicator (RSSI)
Gigabit Ethernet Receivers
Loss of Signal Detection
DESCRIPTION
The ONET4251PA is versatile high-speed limiting amplifier for copper cable and fiber optic applications with
data rates up to 4.25 Gbps.
This device provides gain of about d B, which ensures full 800-m Vp-p differential output swing over its wide
input signal dynamic range.
The high input signal dynamic range ensures low jitter output signals even when overdriven with input signal
swings as high as m Vp-p.
The ONET4251PA comprises loss of signal detection as well as received signal strength indicator.
The part is available in small footprint 3-mm 3-mm 16-pin QFN package. It requires single 3.3-V supply.
This power efficient limiting amplifier dissipates less than m W typical. It is characterized for operation from
–40°C to 85°C.
BLOCK DIAGRAM
simplified block diagram of the ONET4251PA is shown in Figure 1.
This compact 3.3 V, low power 4.25 Gbps limiting amplifier consists of high-speed data path with offset
cancellation block, loss of signal and RSSI detection block, and bandgap voltage reference and bias current
generation block.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Copyright 2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Page Summary Contents For Texas Instruments ONET4251PA Data Sheet
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 13 |
| File Size | 568.01 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
What is the ONET4251PA’s power consumption and supply voltage?
It is a power-efficient amplifier dissipating less than 89 mW typical, requiring a single 3.3-V ±10% supply.
What high data rates does this limiting amplifier support?
It supports multi-rate operation from 1 Gbps up to 4.25 Gbps across various fiber and copper applications.
Does the device include Loss of Signal (LOS) detection?
Yes, it integrates a loss of signal detection circuit which asserts an output if the input signal falls below a specified threshold.
What package is used for the ONET4251PA?
It comes in a small footprint 3-mm × 3-mm 16-pin QFN package.