ONET2511TA Datasheet, PDF (1/12 Pages) Texas Instruments – 2.5 GBPS TRANSIMPEDANCE AMPLIFIER WITH RSSI

Not Recommended for New Designs
ONET2511TA
www.ti.com
SLLS622 – SEPTEMBER 2004
2.5 GBPS TRANSIMPEDANCE AMPLIFIER WITH RSSI
Check for Samples: ONET2511TA
FEATURES
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• 2.5 GHz Bandwidth
• 4.0 kΩ Differential Transimpedance
• 10 pA/√Hz Typical Input Referred Noise
• 2 mA Maximum Input Current
• Offset Cancellation
• Received Signal Strength Indication
• Differential CML Data Outputs
• Single +3.3V Supply
• Bare-Die Option
APPLICATIONS
• SONET OC-48
• SDH STM-16
• APD Preamplifier-Receivers
• PIN Preamplifier-Receivers
DESCRIPTION
The ONET2511TA is a high-speed transimpedance
amplifier used in SDH/SONET systems with data
rates up to 2.5Gbps. It features a low input referred
noise, 2.5GHz bandwidth, 4.0kΩ transimpedance,
and a received signal strength indicator.
The ONET2511TA device is available in die form and
requires a single +3.3V supply. It is very power
efficient and dissipates less than 83 mW (typical). It is
characterized for operations from –40°C to 85°C.
AVAILABLE OPTIONS
T_A
–40°C to 85°C
DIE
ONET2511TAY
DETAILED DESCRIPTION
BLOCK DIAGRAM
The ONET2511TA is a high performance 2.5 Gbps transimpedance amplifier that can be segmented into the
signal path, filter, and offset cancellation block.
The signal path consists of a transimpedance amplifier stage, a voltage amplifier, and an output buffer.
The filter circuit provides a filtered VCC for the photodiode.
The offset correction circuit uses an internal low pass filter to cancel the DC on the input and it provides a signal
to monitor the received signal strength.
A simplified block diagram of the ONET2511TA is shown in Figure 1.
VCC
FILTER
750 W
Disable
Offset
Cancellation
R_F
Bandgap Voltage
Reference and
Bias Current
Generation
RSSI
IN
GND
Transimpedance
Amplifier
+
−
Voltage
Amplifier
+
−
CML
Output
Buffer
OUT+
OUT−
Figure 1. Simplified Block Diagram of the ONET2511TA
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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 © 2004, Texas Instruments Incorporated