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Preliminary Data Sheet, July 1998
FOA1252A1
2.5 Gbit/s Transimpedance Amplifier
ICs for Communications
Never
stop
thinking.
Edition 1998-07 Published by Infineon Technologies AG, St.-Martin-Strasse 53, D-81541 Munchen, Germany
(c) Infineon Technologies AG 1998.
All Rights Reserved. Attention please! The information herein is given to describe certain components and shall not be considered as warranted characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Infineon Technologies is an approved CECC manufacturer. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office in Germany or our Infineon Technologies Representatives worldwide. Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.
Preliminary Data Sheet, July 1998
FOA1252A1
2.5 Gbit/s Transimpedance Amplifier
ICs for Communications
Never
stop
thinking.
FOA1252A1 Revision History: Previous Version: Page Subjects (major changes since last revision) 1998-07
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
FOA1252A1
Table of Contents 1 1.1 1.2 2 2.1 2.2 2.3 2.4 2.5 3
Page
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC/DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Eye-diagrams Measured at Data Rates of 2.5 Gbit/s . . . . . . . . . . . . . . . . . Bit Error Rate (BER) Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 4 5 7 8
Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Preliminary Data Sheet
1
1998-07
2.5 Gbit/s Transimpedance Amplifier FOA1252A1
FOA1252A1
1
1.1
* * * * * * * * * * *
Overview
Features
Data rate up to 2.5 Gbit/s Full ITU-T G958 specification compliance Input sensitivity -23.5 dBm at BER = 10-9 Single supply voltage: +4.5 V to +5.5 V Internal DC-compensation loop increases dynamic range No external components needed Internal bias generation for PIN-photodiode Internal low-pass filter to improve power supply rejection Operates with PIN- or APD-photodiode Monitor output for mirrored photodiode current Additional pair of complementary output pins optimized for TO packages
1.2
Applications
* Fibre optics data communication systems: SDH, SONET, ATM, OC, STM * Pre-amplifier modules Type FOA1252A1 Ordering Code Q67000-H4128 Package bare die
Preliminary Data Sheet
2
1998-07
FOA1252A1
Overview
0.5 k Filter
FOA1252A1
VCC VREF = 4.2 V
1.6 k -40 +4 +9.2 60 Q+ 60 QGND
IN
DC Compensation
VREF
Monitor
ITB11346
Figure 1 Table 1 Symbol
Block Diagram Pin Description Function Supply voltage Data input from PIN- or APD-photodiode Non-inverting data output Inverting data output Bias voltage for PIN-diode Mirrored photodiode current (connect pin via 0 ... 2 k to VCC) Ground
VCC
IN Q+ QFILTER MONITOR GND
Preliminary Data Sheet
3
1998-07
FOA1252A1
Electrical Characteristics
2
2.1
Electrical Characteristics
Absolute Maximum Ratings
Ambient temperature Tamb = -40 C ... +85 C Parameter Supply voltage Junction temperature Storage temperature Relative ambient humidity ESD integrity Symbol Limit Values min. max. 6.0 +125 +150 85/85 - V - - - see note -0.5 -40 -40 - 500 Unit Remarks
VCC Tj TS
-
C C
V
%/C no condensation
VESD
Note: HBM according to MIL STD 883D, method 3015.7 and ESD Assn. Standard S5.1-1993 Note: Stresses above the ones listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2.2
Recommended Operating Conditions
Ambient temperature Tamb = -40 C ... +85 C Parameter Supply voltage Data transmission rate Supply current Thermal resistance Junction temperature
1)
Symbol
Limit Values min. typ. max. +5.5 - - - +4.5 - - - -10 +5.0 2.5 46.7 140 -
Unit V mA K/W
Remarks - -
1)
VCC
-
Gbit/s -
ICC
JA
Tj
+125 C
-
Junction-to-ambient thermal resistance measurement conditions for packaged device: PCB area: 10 cm x 10 cm x 1.5 mm; copper area approx. 60%; via holes to ground layer underneath the device; all pins soldered.
Preliminary Data Sheet
4
1998-07
FOA1252A1
Electrical Characteristics
2.3
AC/DC Characteristics
Conditions: Tamb = +25 C, VCC = +5.0 V, Cexternal = 0.85 pF Parameter Supply current Input voltage Input current Input current before clipping Input resistance Input sensitivity Overload Transimpedance Symbol Limit Values min. typ. 47 - 30 40 0 26 0.78 max. 57 mA V - -
1)
Unit Remarks
IVCC VIN IIN IIN,CL RIN PIN POVL RT
- - - - - - - - 0.6 - 48
+1.65 - - - - - 1.1
2200 App
App -
-
-23.5 -
dBm BER < 10-9 1) dBm BER < 10-9 1) k Vpp MHz differential into 2 x 50
Output voltage swing VOUT (Q+ - Q-) Bandwidth (-3 dB) Output resistance Output voltage Output pattern jitter Power supply rejection ratio Bias resistance
1)
f3db ROUT
1600 - 60 72
V ps dB
internally connected to
VCC VCMOUT - tj,p PSSR
- - - 400 - -
VCC - -
0.6 15 45 35 500 +4.2 65 - - - 600 - -
(Q+ + Q-)/2 50 App < IIN < 500 App 500 App < IIN < 2 mApp
f < 10 MHz2)
- - AC-coupled outputs (via 22 nF)
RBIAS Bias voltage VBIAS Low frequency cutoff f3db,low
V kHz
1) 2)
Data rate: 2.5 Gbit/s; data sequence: PRBS 223 - 1, overload measured electrically, 0 dBm = 1 mA average Generated noise on power supply: sine curve, 100 mVpp (see application note b)
Preliminary Data Sheet
5
1998-07
FOA1252A1
Electrical Characteristics
Bare die
GND GND GND GND GND
Q-
VCC
GND IN Filter GND N.C. FOA1252A1 Size: 1.31 x 1 mm 2
N.C. GND QGND Q+ GND Q+
GND GND GND GND GND
ITP11348
Figure 2
Pad Assignment
Preliminary Data Sheet
6
1998-07
FOA1252A1
Electrical Characteristics
2.4
Eye-diagrams Measured at Data Rates of 2.5 Gbit/s
Ext. Modulator
EDFA
Optical OUT: -2 dBm
Attenuator Q+
IN FOA1252 (DUT)
TEK El.1) CSA803A QOpt.2)
Monitor OUT: -8 dBm STM16 Bit Pattern Generator
1) 2)
Electrical input: sampling head SD26, bandwidth 20 GHz, risetime < 17.5 ps Optical input: O/E-converter head SD26, bandwidth 20 GHz, opt. pulse response speed (FWHM) < 28.5 ps
ITA11349
Figure 3
Measurement Set-up
ITD11350
ITD11351
100 mV /div
100 mV /div
trig'd
trig'd
-531 mV 109.6 ns
100 ps/div
110.6 ns
-531 mV 109.6 ns
100 ps/div
110.6 ns
Figure 4
Eye Diagrams at input Power -20 dBm (top) and -25 dBm (bottom)
Preliminary Data Sheet
7
1998-07
FOA1252A1
Electrical Characteristics
2.5
Bit Error Rate (BER) Measurements
Clock Inp Clock & Data Recovery Ref Data SDH RX
Coupler SDH TX 10 dB Attenuator
10 dB TIA (DUT) 10 dB
LG 1605 (AT&T)
ITA11352
Figure 5
Measurement Set-up
10-4 BER 10-6
ITD11353
T = 20 C
10-7 10-8 10-9 10-10 10-11 -26
-25
-24 Optical Input Power
-23
dBm -22
Figure 6
Measured Bit Error Rate for STM-16 Signal
Preliminary Data Sheet
8
1998-07
FOA1252A1
Application Notes
3
Application Notes
a) General information * The output pins Q+ and Q- must be terminated equally to prevent instabilities. * It is recommended to minimize stray capacitance when connecting photodiode to transimpedance amplifier. * To improve power supply rejection ratio (PSRR), VCC should be supplied via resistor (4.7 ), capacitor (100 nF) to GND, and inductor (BLM11A601, Murata) to VCC-pin. * The monitor pin (not used in these application notes) must be left open or connected to VCC via resistor of 0 ... 2 k. b)
L1)
4.7
VCC
100 nF GND PINDiode Filter IN FOA1252
VCC
Q+ QGND
22 nF Q+ Q22 nF
1)
BLM11A601, Murata
ITS11354
Figure 7
Application Using PIN-photodiode
Preliminary Data Sheet
9
1998-07
FOA1252A1
Application Notes c)
L1) VAPD
4.7
VCC
100 nF GND
x k x nF Filter APDDiode IN FOA1252
VCC
Q+ QGND
22 nF Q+ Q22 nF
1)
BLM11A601, Murata
ITS11355
Figure 8
Application Using APD-photodiode
Preliminary Data Sheet
10
1998-07
FOA1252A1
Application Notes d)
VCC
PIN-Diode OUT+
TO-Can
OUT-
N.C. GND Filter
IN GND
FOA1252 GND GND GND GND GND
VCC
GND GND GND GND GND
Note: No external components needed.
GND Q+ GND QGND N.C. Q-
Q+
ITA11356
Figure 9
Application Example of FOA1252A1 Mounted in TO-can
Preliminary Data Sheet
11
1998-07
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