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| ATA121302 ADVANCED PRODUCT INFORMATION - Rev 0.1 FEATURES * * * * * * 1.25 Gb/s Differential Output TIA Automatic Gain Control Single +5V Supply 1100 MHz Bandwidth -28 dBm typical sensitivity On-Chip PIN Photodiode Bias Voltage 1.25Gb/s Transimpedance Amplifier APPLICATIONS * * Gigabit Ethernet (1.250 Gb/s) Fibre Channel (1.0625 Gb/s) D1C PRODUCT DESCRIPTION The ANADIGICS ATA121302 is a +5V low noise transimpedance amplifier designed to be used in Gigabit Ethernet and Fiber Channel fiber optic links. The device is used in conjunction with a photodetector (PIN diode or avalanche photodiode) to convert an optical signal into a differential output VDD voltage. The ATA121302 offers a bandwidth of 1100MHz, a dynamic range in excess of 28dB and an on-chip bias voltage for PIN photodetectors. It is manufactured in a GaAs MESFET process and is available in bare die form. 4K IIN VOUT VOUT AGC US Patent: 5047728, 5602510 VN Charge Pump 6.5 GHz Osc US Patent Pending GND The photodetector cathode must be connected to IIN and the anode can be connected to VN or ground for proper AGC operation. Figure 1: ATA121302 Equivalent Circuit 08/2001 2-1 ATA121302 Figure 2: Bonding Pad Layout Table 1: ATA121302 Pad Description PAD VD D IIN VN VOUT VOUT D ESC R IPTION Posi ti ve Supply Voltage TIA Input Negati ve Voltage for Photodi ode Bi asi ng TIA Output Voltage (Non-Inverted) TIA Output Voltage (Inverted) C OMMEN T + 5 Volts C onnect to detector cathode for proper operati on C onnect to detector anode for opti mum performance Logi cal '1' wi th opti cal i nput Logi cal '0' wi th opti cal i nput ELECTRICAL CHARACTERISTICS Table 2: Absolute Maximum Ratings V DD II N TS 7.0V 3.5mA Storage Temp. -65 0C to 125 0C 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 ADVANCED PRODUCT INFORMATION - Rev 0.1 08/2001 ATA121302 Table 3: Electrical Specifications (1) (TA= 25 OC, VDD =+5.0V + 10%) PAR AMETER Small Si gnal D i fferenti al (RL = 100 ) Transresi stance (2) Bandwi dth Low Frequency C utoff Input Resi stance Output Resi stance Input Offset Voltage Output Offset Voltage Photodi ode Bi asi ng Voltage (VN) Opti cal Overload (1), (3) MIN 1000 - TYP 2.8 1100 800 100 MAX - U N IT KW MHz kHz W - - 40 1.4 2.2 -5 W V V V dB m dB m -3 +4.5 0 350 280 4 20 100 35 +5.0 - 28 Opti cal Sensi ti vi ty (1), (3) Input Noi se C urrent D i fferenti al Output Voltage (4), (5) TRISE & TFALL ( 20 - 80% ) (5), (6) D uty C ycle D i storti on (4), (7) RMS Ji tter (4), (7), (8) Total Ji tter (pk-pk) Supply C urrent Operati ng Voltage Range Operati ng Temperature Range (4), (7), (9) 280 +5.5 85 nA r ms mV ps % ps ps mA V o C Notes: 1. Measured with a photodiode having a maximum capacitance of 0.6 pF and a minimum responsivity of 0.8 A/W. 2. f = 50 MHz 3. Measured at 1010 BER with a 27-1 PRBS, 1.25 Gb/s. 4. Input optical power = -3 dBm, RL = 100 W (differential) 5. Measured with a 625 MHz, 50% duty cycle square wave. 6. Measured differentially at -14dBm optical input power. 7. Measured with a 27-1 PRBS. 8. 1s about the center eye crossing. 9. 6s about the center eye crossing. ADVANCED PRODUCT INFORMATION - Rev 0.1 08/2001 3 ATA121302 Scribe streets are 37.5mm wide Figure 3: ATA 121302 Typical Bonding Diagram PERFORMANCE DATA Figure 4: Frequency Response (Typical Characteristics measured with a photodiode) 35 30 25 20 15 10 5 0 0 500 1000 1500 2000 2500 3000 3500 Frequency (MHz) Amplitude (dB) 4 ADVANCED PRODUCT INFORMATION - Rev 0.1 08/2001 ATA121302 Figure 5: Eye Diagram with an Optical Input Power of 3dB 100mV/Div 200ps/Div Figure 6: Eye Diagram with an Optical Input Power of 17 dBm 50mV/Div 200ps/Div ADVANCED PRODUCT INFORMATION - Rev 0.1 08/2001 5 ATA121302 Figure 7: Supply Current vs. Case Temperature 45 1160 Figure 8: Bandwidth vs. Case Temperature 1140 40 1120 Supply Current (mA) 35 4.5V 5.0V 5.5V Bandwidth (MHz) 1100 4.5V 5.0V 5.5V 30 1080 25 1060 20 0 10 20 30 40 50 60 70 80 90 Case Temperature (C) 1040 0 10 20 30 40 50 60 70 80 90 Case Temperature (C) Figure 9: Differential Responsivity vs. Temperature 3750 Figure 10: Sensitivity vs. Case Temperature -27.00 -27.20 3500 -27.40 Differential Responsivity (V/W) -27.60 Sensitivity (dBm) 3250 4.5V 5.0V 5.5V -27.80 -28.00 4.5V 5.0V 5.5V 3000 -28.20 2750 -28.40 -28.60 2500 0 10 20 30 40 50 60 70 80 90 Case Temperature (C) -28.80 0 10 20 30 40 50 60 70 80 90 Case Temperature (C) 6 ADVANCED PRODUCT INFORMATION - Rev 0.1 08/2001 ATA121302 APPLICATION INFORMATION VDD 0.1uF 2 4K OUT 1 CF 3 0.1uF RO 0.1uF LIMITING AMPLIFIER OUT AGC Charge Pump 6.5 GHz OSC 4 CF is an optional single pole noise filter CF = Figure 11: Application Schematic 1 2 fcR fc is the desired cutoff frequency R = 50 W RO is required with high input resistance limiting amplifiers RO = 100 W ADVANCED PRODUCT INFORMATION - Rev 0.1 08/2001 7 ATA121302 ORDERING INFORMATION PAR T N U MB ER ATA121302D 1C PAC K AGE OPTION D1 Die PAC K AGE D ESC R IPTION 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. ADVANCED PRODUCT INFORMATION- Rev 0.1 08/2001 8 |
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