ICs for Communications
2.5 Gbit/s, 3.3 V Transimpedance Amplifier
FOA1251B1, FOA1252B1
Device Version 1.0
Advance Datasheet
A
High Gain 3.3 V Transimpedance Amplifier with Postamplifier for
Tele- and Datacom Receiver Applications
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10June1999
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FOA1251B1, FOA1252B1
Advance Information
Revision History:
Current Version: 10June1999
Previous Version:
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(in previous (in current
Version)
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Subjects (major changes since last revision)
For questions on technology, delivery and prices please contact the Infineon Technologies Offices
in Germany or the Infineon Technologies Companies and Representatives worldwide:
see our webpage at http://www.infineon.com
Related Documentation
ITU-T G957
Belcore GR-253-Core
•
Edition 10June1999
Published by Infineon Technologies AG i. Gr.,
SC,
Balanstraße 73,
81541 München
©
Infineon Technologies AG i.Gr. 1999.
All Rights Reserved.
Attention please!
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applications, processes and circuits implemented within components or assemblies.
The information describes the type of component and shall not be considered as assured characteristics.
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question please contact your nearest Infineon Technologies Office.
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1
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2
with
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dangered.
FOA1251B1, FOA1252B1
Advance Information
Table of Contents
1
1.1
1.2
1.3
1.4
1.5
1.6
2
3
3.1
3.2
3.3
3.4
4
4.1
4.2
4.3
4.4
5
5.1
5.2
5.3
Overview
Features
Typical Applications
General Description
Pin Configuration
Pad Definitions and Functions
Functional Block Diagram
Circuit Description
Electrical Characteristics
Absolute Maximum Ratings
Operating Range
DC-Characteristics
AC-Characteristics
Test Circuits and Resuilts (preliminary)
Bit Error Rate Measurements (BER)
Eye Diagrams
Bandwidth and Transimpedance
AC-Characteristics
Application Notes
General Information
Typical Applications
Bandwidth and Transimpedance
6
Package and Bare Die Outlines
6.1 Package Outline
6.2 Bare Die Outlines
7
9
10
Glossary
Index
Notes
Advance Datasheet, Document Rev. 1.0
3
10June1999
Advance Information
2.5 Gbit/s, 3.3 V Transimpedance Amplifier
FOA1251B1
FOA1252B1
Device Version 1.0
Bipolar
1
1.1
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Overview
Features
Nominal data rate: 2.488 Gbit/s.
Input sensitivity: - 23.0 dBm at BER = 10
–10
.
Transimpedance: 27 kΩ.
High overload: 2.2 mA
pp
maximum input current.
Single power supply: + 3.3 V.
Full ITU-T G957 specification compliance.
P-TSSOP-16-1
Internal DC-compensation loop increases dynamic range.
Operation without external components.
Internal bias generation for PIN-photodiode.
Internal low-pass filter to improve power supply rejection.
Operates with PIN-photodiode or APD.
Monitor output for mirrored photodiode current.
Additional pair of complementary output pins optimized for TO-packages.
1.2
Typical Applications
• Fibre optics data- and telecommmunication systems as e.g. OC48 and STM 16:
- SDH,
- SONET,
- ATM.
• Pre-Amplifier Modules.
• Optical Receiver Modules.
• Digital CATV
Type
FOA1251B1
FOA1252B1
Ordering Code
Q67000-H????
Q67000-H????
1-4
Package
P-TSSOP-16-1
Bare die
10June1999
Advance Datasheet, Document Rev. 1.0
FOA1251B1, FOA1252B1
Advance Information
Overview
1.3
General Description
The FOA1251B1, FOA1252B1 is a high performance transimpedance amplifier (TIA)
designed for use in data- and telecommunication systems for optical networks:
• SDH STM-16
• SONET OC-48
The FOA1251B1, FOA1252B1 can be used from a single +3.3 V power supply. It offers
a transimpedance of typically 27 kΩ over a 3 dB bandwidth of at least 1600 MHz. The
sensitivity of the device allows for a limitated output voltage with input currents greater
than 10
µA.
The output signal has a typical differential amplitude of 500 mV
pp
, which facilitates easy
interconnection to downstream clock/data recovery and demultiplexer devices. The high
output voltage and the built-in limiting function eliminate the need for a limiting amplifier
in typical receiver applications.
The FOA1251B1, FOA1252B1 has an on-chip filtered output used for DC biasing of the
PIN-diode. If an APD is used as input signal source, an external DC source with higher
voltage may be required. Decoupling to the filter terminal of the FOA1251B1,
FOA1252B1 is still recommended because this pin serves as stable reference point for
the input signal.
The input sensitivity which is measured at BER = 10
-10
is better than -23 dBm.
A separate monitor signal is available from the FOA1251B1, FOA1252B1. This signal is
intended for supervision of the input DC current without intrusion into the sensitive input
signal path.
The FOA1251B1, FOA1252B1 can be delivered in a standard TSSOP-16 plastic
package for PCB mounting, or as die for integration with the PIN diode into one package.
The latter will keep the high impedance interconnection to the PIN diode short, which
results in increased bandwidth and a minimized noise-pickup.
Advance Datasheet, Document Rev. 1.0
1-5
10June1999
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