Page 1
FEATURES
· 1.25 Gb/s Differential Output TIA
· 5V Operation
· Automatic Gain Control
· 850nm Photodetector with
100 mm x 100 mm Active Area
· Integrated MSM detector & TIA
· TO-46 Ultra Flat Window
AMT128502A
1.25 Gb/s Integrated 850 nm MSM-TIA
Data sheet - Rev. 0
APPLICATIONS
· Gigabit Ethernet (1.250Gb/s)
· Fibre Channel (1.0625 Gb/s)
Product Description
The ANADIGICS AMT128502A is a 5V monolithically
integrated Metal-Semiconductor-Metal (MSM)
photodetector and transimpedance amplifier (TIA)
used to convert an 850nm input optical signal into a
differential output voltage, and is manufactured in
ANADIGICS 6 GaAs wafer fabrication facility. The
integrated MSM and TIA receiver maximizes the
receiver performance by minimizing the
photodetector input parasitics to the TIA and
Figure 1: AMT128502A Equivalent Circuit
V
DD
2
AGC
US Patents: 5047728, 5646573
P
IN
Charge
Pump
T46F
TO-46 Ultra Flat Window
Package
internally biasing the photodetector to achieve high
sensitivity, bandwidth and overload performance. As
an integrated product the reliability is inherently
better than a discrete solution, and both the MSM-TIA
integrated circuit and TO46 flat window packaged
receiver pass stringent reliability requirements.
These products are readily designed into receivers
and transceivers for Gigabit Ethernet and Fibre
Channel applications.
4K
6.5 GHz
Osc
OUT
OUT
1
3
4
Page 2
AMT128502A
Table 1: Absolute Maximum Ratings
V
DD
P
NI
T
S
V0.7
mBd5+
C°521otC°56-.pmeTegarotS
Table 2: Electrical Characteristics
RETEMARAP NIM PYT XAM TINU
)(htgnelevaW077058068mn
l
aerAevitcArotceteD-001x001-mµ
)zHM05@(
)1(
htdiwdnaB
ffotuCycneuqerFwoL-0030001zHk
ecnatsiseRtuptuO520406mhO
)2(
daolrevOlacitpO
)2(
ytivitisneSlacitpO
T&
T
ESIR
LLAF
noitrotsiDelcyCytuD
)6(,)5(,)3(
rettiJSMR
)kp-kp(rettiJlatoT
)4(,)3(
egatloVtuptuOlaitnereffiD
)4(,)3(
)%08-02(
)5(,)3(
)7(,)5(,)3(
tnerruCylppuS--05Am
egnaRegatloVgnitarepO5.4+0.5+5.5+V
(1) Measured at 14 dBm optical input power with output connected into RL = 100W
(differential)
(2) Measured at 10
-10
BER with a 27-1 PRBS at 1.25 GB/s
(3) Input optical power = -3 dBm, RL = 100 W (differential).
(4) Measured with a 625 MHz, 50% duty cycle square wave.
(5) Measured with a 1.25 Gb/s, 27-1 PRBS.
(6) 1s about the center eye crossing.
(7) 6s about the center eye crossing.
)1(
ytivisnopseRlaitnereffiDlangiSllamS
0001--W/V
0001-0051zHM
0--mBd
02-22-mBd
-007-Vm
-062-sp
-401%
-51-sp
-09-sp
egnaRerutarepmeTtneibmAgnitarepO0-07C°
2
Table 3: Package Pin Description
NIPnoitpircseDtnemmoC
1V
2V
3V
TUO
DD
TUO
egatloVylppuSevitisoP-stloV5+
)detrevni-non(egatloVtuptuOAIT-tupnilacitpohtiw'1'lacigoL
)detrevni(egatloVtuptuOAIT-tupnilacitpohtiw'0'lacigoL
4dnuorGdednuorgsiesaC
Data Sheet - Revision 0
03/01
2
Page 3
AMT128502A
Figure 2: Eye Diagram with an Optical Input
Power of -17dBm
10mV/Div 200ps/Div
Figure 3: Eye Diagram with an Optical Input
Power of -1.0dBm
150mV/Div. 200ps/Div
Figure 4: Supply Current vs. Temperature Figure 5: Bandwidth vs. Temperature
50.0
45.0
40.0
35.0
30.0
25.0
Supply Current (mA)
20.0
0 20406080100
Ambient Temperature (C)
4.5V
5.0V
5.5V
1600
1400
1200
1000
800
Bandwidth (MHz)
600
020406080100
Ambient Temperature (C)
4.5V
5.0V
5.5V
Figure 6: Differential Responsivity vs.
2000
1800
1600
1400
1200
1000
0 20406080100
Differential Responsivity ( V/W)
4.5V
5.0V
5.5V
Sensitivity (dBm)
-20.0
-20.5
-21.0
-21.5
-22.0
-22.5
-23.0
-23.5
-24.0
Ambient Temperature (C)
Temperature
3
Data Sheet - Revision 0
03/01
Figure 7: Sensitivity vs. Temperature
4.5V
5.0V
5.5V
0 20406080100
Ambient Temperature (C)
Page 4
AMT128502A
Figure 8: Test Setup for Frequency Response
Lightwave
Analyzer
HP 8702D
BERT
Pulse Pattern
Generator
Laser
Extinction
Ratio = 9dB
Laser
Extinction
Ratio= 3dB
Optical Attenuator
Figure 9: Test Setup for Sensitivity
Error
Detector
Optical
Attenuator
Hybrid
Coupler
DUT Test
Fixture
Power
Supply
Limiting
Amplifier
DUT Test
Fixture
Power
Supply
25 dB Gain
Figure 10: Test Setup for Eye Measurements
Pulse Pattern
Generator
Laser
Extinction
Ratio = 9dB
Optical
Attenuator
Data Sheet - Revision 0
03/01
Digital
Communication
Analyzer HP83480A
DUT Test
Fixture
Power
Supply
4
Page 5
Figure 11: DUT Test Fixture Schematic
V
DD
0.1uF
AMT128502A
V
OUT
0.1uF
DUT
0.1
uF
V
OUT
Figure 12: Application Schematic
V
DD
0.1uF
2
4K
OUT
AGC
Charge
Pump
4
6.5 GHz
OSC
OUT
0.1uF
1
3
R
C
O
F
0.1uF
LIMITING
AMPLIFIER
C
is an optional single pole noise filter
F
C
f
c
1
=
F
π
fcR
2
is the desired cutoff frequency
R = 50 W
R
is required with high input resistance limiting amplifiers
O
R
= 100 W
O
5
Data Sheet - Revision 0
03/01
Page 6
AMT128502A
Figure 13: Evaluation Board Schematic
V
DD
0.1uF
2
4K
OUT
OUT
AGC
Charge
Pump
6.5 GHz
OSC
4
Figure 14: Evaluation Board Layout
1
3
0.1uF
0.1uF
V
OUT
V
OUT
Data Sheet - Revision 0
03/01
6
Page 7
Figure 15: T46F Package Outline Diagram
AMT128502A
7
Data Sheet - Revision 0
03/01
Page 8
Ordering Information
rebmuNtraP noitpOegakcaP noitpircseDegakcaP
F64TA205821TMAF64-OTwodniWtalFartlU
AMT128502A
ANADIGICS, Inc.
141 Mount Bethel Road
Warren, New Jersey 07059, U.S.A
Tel: +1 (908) 668-5000
Fax: +1 (908) 668-5132
http://www.anadigics.com
Mktg@anadigics.com
IMPORTANT NOTICE
ANADIGICS, Inc. reserves the right to make changes to its products or discontinue any product at any time without notice.
The Advanced Product data sheets and product specifications contained in this data sheet are subject to change prior to
a products formal introduction. The information in this data sheet has been carefully checked and is assumed to be reliable.
However, ANADIGICS assumes no responsibility for inaccuracies. ANADIGICS strongly urges customers to verify that the
information they are using is current before placing orders.
WARNING
ANADIGICS products are not intended for use in life support appliances, devices, or systems. Use of an ANADIGICS
product in any such application without written consent is prohibited.
8
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