ONET4251PA Datasheet, PDF (1/16 Pages) Texas Instruments – 1 Gbps to 4.25 Gbps Limiting Amplifier With LOS and RSSI

ONET4251PA
www.ti.com
SLLS663A – SEPTEMBER 2005 – REVISED NOVEMBER 2005
1 Gbps to 4.25 Gbps Limiting Amplifier With LOS and RSSI
FEATURES
• Multi-Rate Operation from 1 Gbps up to
4.25 Gbps
• 89-mW Power Consumption
• Input Offset Cancellation
• High Input Dynamic Range
• Output Disable
• CML Data Outputs
• Receive Signal Strength Indicator (RSSI)
• Loss of Signal Detection
• Polarity Select
• Single 3.3-V Supply
• Surface Mount Small Footprint 3-mm × 3-mm
16-Pin QFN Package
APPLICATIONS
• Cable Driver and Receiver
• 1.0625 Gbps, 2.125 Gbps, and 4.25 Gbps Fibre
Channel Receivers
• Gigabit Ethernet Receivers
DESCRIPTION
The ONET4251PA is a versatile high-speed limiting amplifier for copper cable and fiber optic applications with
data rates up to 4.25 Gbps.
This device provides a gain of about 50 dB, which ensures a full 800-mV_p-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 1200 mV_p-p.
The ONET4251PA comprises a loss of signal detection as well as a received signal strength indicator.
The part is available in a small footprint 3-mm × 3-mm 16-pin QFN package. It requires a single 3.3-V supply.
This power efficient limiting amplifier dissipates less than 89 mW typical. It is characterized for operation from
–40°C to 85°C.
BLOCK DIAGRAM
A 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 a high-speed data path with offset
cancellation block, a loss of signal and RSSI detection block, and a 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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005, Texas Instruments Incorporated