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1.25 Gb/s Integrated 850 nm MSM-TIA
AMT128502A
Data sheet - Rev 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
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
VDD 2
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 OUT
1 3
OUT AGC
US Patents: 5047728, 5646573
PIN
Charge Pump
6.5 GHz Osc
4
Figure 1: AMT128502A Equivalent Circuit
03-2001
AMT128502A
Figure 2: Pin Outline (Bottom View)
Table 1: Package Pin Description
PIN 1 2 3 4
D ESC R IPTION VOUT - TIA Output Voltage (Non-i nverted) VDD - Posi ti ve Supply Voltage VOUT - TIA Output Voltage (Inverted) Ground
C OMMEN T Logi cal '1' wi th opti cal i nput +5 Volts Logi cal '0' wi th opti cal i nput C ase i s grounded
ELECTRICAL CHARACTERISTICS
Table 2: Absolute Maximum Ratings
V DD PIN TS 7.0 V + 5 dB m Storage Temp. - 65 C to 125 C
Stresses in excess of the absolute ratings may cause permanent damage. Functional operation is not implied under these conditions. Exposure to absolute ratings for extended periods of time may adversely affect reliability.
2
Data Sheet - Rev.1 03-2001
AMT128502A Table 3: Electrical Characteristics
PAR AMETER Wavelength (l ) 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 Opti cal Overload (2) Opti cal Sensi ti vi ty (2) D i fferenti al Output Voltage D uty C ycle D i storti on (3), (5) RMS Ji tter
(3), (5), (6) (3), (4)
MIN 770 1000 1000 25 0 -20 + 4.5 0
TYP 850 100 x 100 300 40 - 22 700 260 4 15 90 +5.0 -
MAX 860 1500 1000 60 10 50 +5.5 70
U N IT nm m2 V/W MHz kHz Ohm dB m dB m mV ps % ps ps mA V C
TRISE & TFALL (20 - 80%) (3), (4)
Total Ji tter (pk-pk) (3), (5), (7) Supply C urrent Operati ng Voltage Range Operati ng Ambi ent Temperature Range
NOTES: (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.
Data Sheet - Rev. 1 03-2001
3
AMT128502A
PERFORMANCE DATA
Figure 3: Eye Diagram with an Optical Input Power of -17dBm
Figure 4: Eye Diagram with an Optical Input Power of -1.0dBm
10mV/Div
200ps/Div
150mV/Div.
200ps/Div
Figure 5: Supply Current vs. Temperature
50.0 1600
Figure 6: Bandwidth vs. Temperature
Bandwidth (MHz)
Supply Current (mA)
45.0 40.0 35.0 30.0 25.0 20.0 0 20 40 60 80 100 4.5V 5.0V 5.5V
1400 1200 1000 800 600 0 20 40 60 80 100 4.5V 5.0V 5.5V
Ambient Temperature (C)
Ambient Temperature (C)
Differential Responsivity (V/W)
Figure 7: Differential Responsivity vs. Temperature
2000 1800 1600 1400 1200 1000 0 20 40 60 80 100
Figure 8: Sensitivity vs. Temperature
-20.0
Sensitivity (dBm)
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
4.5V 5.0V 5.5V
100
Ambient Temperature (C)
Ambient Temperature (C)
4
Data Sheet - Rev.1 03-2001
AMT128502A
MEASUREMENT METHODS
Lightwave Analyzer HP 8702D
Laser
Optical Attenuator
DUT Test Fixture
Extinction Ratio= 3dB
Power Supply
Figure 9: Test Setup for Frequency Response
BERT
Pulse Pattern Generator
Error Detector
Hybrid Coupler
Limiting Amplifier
25 dB Gain
Laser
Optical Attenuator
DUT Test Fixture
Extinction Ratio = 9dB Power Supply
Figure 10: Test Setup for Sensitivity
Pulse Pattern Generator
Digital Communication Analyzer HP83480A
Laser
Optical Attenuator
DUT Test Fixture
Extinction Ratio = 9dB
Power Supply
Figure 11: Test Setup for Eye Measurements
Data Sheet - Rev. 1 03-2001
5
AMT128502A
VDD
0.1uF
VOUT 0.1uF
DUT 0.1 uF
VOUT
Figure 12: DUT Test Fixture Schematic
APPLICATION INFORMATION
V DD 0.1uF 2
4K OUT
1 CF 3
0.1uF RO 0.1uF
OUT AGC
LIMITING
Charge Pump
6.5 GHz OSC
4
Figure 13: Application Schematic
CF is an optional single pole noise filter
CF =
1 2 fcR
fc is the desired cutoff frequency R = 50 W RO is required with high input resistance limiting amplifiers RO = 100 W
6
Data Sheet - Rev.1 03-2001
AMT128502A
VDD 0.1uF 2
4K OUT
1
0.1uF
VOUT VOUT
OUT AGC
3 0.1uF
Charge Pump
6.5 GHz OSC
4
Figure 14: Evaluation Board Schematic
Figure 15: Evaluation Board Layout
Data Sheet - Rev. 1 03-2001
7
AMT128502A
PACKAGE OUTLINE
Figure 16: T46F Package Outline Diagram
8
Data Sheet - Rev.1 03-2001
AMT128502A
NOTES
Data Sheet - Rev. 1 03-2001
9
AMT128502A
NOTES
10
Data Sheet - Rev.1 03-2001
AMT128502A
NOTES
Data Sheet - Rev. 1 03-2001
11
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 to discontinue any product at any time without notice. The product specifications contained in Advanced Product Information sheets and Preliminary Data Sheets are subject to change prior to a products formal introduction. Information in Data Sheets have been carefully checked and are assumed to be reliable; however, ANADIGICS assumes no responsibilities 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. Data Sheet - Rev. 1 03-01
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