ANADIGICS AMT128502AT46F

AMT128502A
1.25 Gb/s Integrated 850 nm MSM-TIA
Data sheet - Rev. 0
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
APPLICATIONS
·
Gigabit Ethernet (1.250Gb/s)
·
Fibre Channel (1.0625 Gb/s)
T46F
TO-46 Ultra Flat Window
Package
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
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.
Figure 1: AMT128502A Equivalent Circuit
VDD
2
4K
OUT
1
3
OUT
AGC
US Patents: 5047728, 5646573
PIN
Charge
Pump
4
6.5 GHz
Osc
AMT128502A
Table 1: Absolute Maximum Ratings
V DD
7.0 V
PIN
+ 5 dB m
TS
Storage Temp. - 65 °C to 125 °C
Table 2: Electrical Characteristics
PAR AMETER
MIN
TYP
MAX
Wavelength ( l)
770
850
860
nm
-
100 x 100
-
µm2
1000
-
-
V/W
1000
-
1500
MHz
-
300
1000
kHz
25
40
60
Ohm
D etector Acti ve Area
Small Si gnal D i fferenti al Responsi vi ty (1)
(@50 MHz)
Bandwi dth(1)
Low Frequency C utoff
Output Resi stance
U N IT
0
-
-
dB m
-20
-
- 22
700
260
4
15
10
-
dB m
mV
ps
%
ps
Total Ji tter (pk-pk) (3), (5), (7)
-
90
-
ps
Supply C urrent
-
-
50
mA
+ 4.5
+5.0
+5.5
Opti cal Overload (2)
Opti cal Sensi ti vi ty (2)
D i fferenti al Output Voltage (3), (4)
TRISE & TFALL (20 - 80%) (3), (4)
D uty C ycle D i storti on (3), (5)
RMS Ji tter (3), (5), (6)
Operati ng Voltage Range
Operati ng Ambi ent Temperature Range
0
70
(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.
V
°C
Table 3: Package Pin Description
PIN
D escription
C omment
1
VOUT - TIA Output Voltage (non- i nverted)
Logi cal '1' wi th opti cal i nput
2
VDD - Posi ti ve Supply Voltage
+ 5 Volts
3
VOUT - TIA Output Voltage (i nverted)
Logi cal '0' wi th opti cal i nput
4
Ground
C ase i s grounded
Data Sheet - Revision 0
03/01
2
AMT128502A
Figure 3: Eye Diagram with an Optical Input
Power of -1.0dBm
Figure 2: Eye Diagram with an Optical Input
Power of -17dBm
10mV/Div
150mV/Div.
200ps/Div
Figure 4: Supply Current vs. Temperature
Figure 5: Bandwidth vs. Temperature
1600
Bandwidth (MHz)
Supply Current (mA)
50.0
45.0
40.0
35.0
30.0
4.5V
5.0V
5.5V
25.0
1400
1200
1000
4.5V
5.0V
5.5V
800
600
20.0
0
20
40
60
80
0
100
20
Figure 6: Differential Responsivity vs.
Temperature
2000
60
80
100
Figure 7: Sensitivity vs. Temperature
-20.0
4.5V
5.0V
5.5V
1800
40
Ambient Temperature (C)
Sensitivity (dBm)
Differential Responsivity (V/W)
Ambient Temperature (C)
1600
1400
1200
1000
4.5V
5.0V
5.5V
-20.5
-21.0
-21.5
-22.0
-22.5
-23.0
-23.5
-24.0
0
20
40
60
80
100
0
Ambient Temperature (C)
3
200ps/Div
20
40
60
80
Ambient Temperature (C)
Data Sheet - Revision 0
03/01
100
AMT128502A
Figure 8: Test Setup for Frequency Response
Lightwave
Analyzer
HP 8702D
Laser
DUT Test
Fixture
Optical Attenuator
Power
Supply
Extinction
Ratio= 3dB
Figure 9: Test Setup for Sensitivity
BERT
Pulse Pattern
Generator
Error
Detector
Hybrid
Coupler
Limiting
Amplifier
Optical
Attenuator
Laser
25 dB Gain
DUT Test
Fixture
Extinction
Ratio = 9dB
Power
Supply
Figure 10: Test Setup for Eye Measurements
Digital
Communication
Analyzer HP83480A
Pulse Pattern
Generator
Laser
Optical
Attenuator
DUT Test
Fixture
Extinction
Ratio = 9dB
Power
Supply
Data Sheet - Revision 0
03/01
4
AMT128502A
Figure 11: DUT Test Fixture Schematic
VDD
0.1uF
DUT
VOUT
0.1uF
V OUT
0.1 uF
Figure 12: Application Schematic
V
DD
0.1uF
2
4K
OUT
1
CF
3
OUT
AGC
Charge
Pump
0.1uF
RO
0.1uF
LIMITING
AMPLIFIER
6.5 GHz
OSC
4
CF is an optional single pole noise filter
CF =
1
2π fcR
fc is the desired cutoff frequency
R = 50 W
RO is required with high input resistance limiting amplifiers
RO = 100 W
5
Data Sheet - Revision 0
03/01
AMT128502A
Figure 13: Evaluation Board Schematic
VDD
0.1uF
2
4K
OUT
OUT
1
0.1uF
3 0.1uF
VOUT
VOUT
AGC
Charge
Pump
6.5 GHz
OSC
4
Figure 14: Evaluation Board Layout
Data Sheet - Revision 0
03/01
6
AMT128502A
Figure 15: T46F Package Outline Diagram
7
Data Sheet - Revision 0
03/01
AMT128502A
Ordering Information
Part N umber
AMT128502AT46F
Package Option
TO-46F
Package D escription
Ultra Flat Wi ndow
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.
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