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| 10GB/s Offset Control TIA Advanced Product Information - Rev 0 ATA7602 FEATURES * * * * * * Differential Output Topology DC Output Offset Control (external loop) Low Group Delay DC Coupled Outputs -5.2V Power Supply InGaP HBT Technology APPLICATIONS * * * SONET OC-192/STM-64 10Gb/s DWDM 10Gb/s Datacom D1 Package PRODUCT DESCRIPTION The ANADIGICS ATA7602 is a -5.2V high speed transimpedance amplifier (TIA) for 10Gb/s applications available in bare die form and manufactured using an InGaP HBT process. The device is used in conjunction with a photodetector to convert an optical signal into a differential voltage that can be AC or DC coupled to a post amplifier. The DC offset between the two outputs can be adjusted in order to maintain low dury cycle distortion for large signal operation or to provide an adjustable decision threshold for the post amplifier. Figure 1: Block Diagram ATA7602 Absolute Maximum Ratings PAR AMETER D C Power supply (VEE) Storage Temperature D C Input C urrent MIN -7.0 -65 TYP MAX 1.0 125 3.0 U N IT V o C mA Operating Conditions PAR AMETER Operati ng Voltage Range Operati ng Temperature Range Photodi ode C apaci tance (PIN + stray) Seri es Resi stance (Bondwi re + anode) Bondwi re Inductance MIN -5.50 -40 TYP -5.2 MAX -4.90 85 0.3 15 1.0 U N IT V o C pF W nH DC Characteristics PAR AMETER Supply C urrent (D C C oupled) Input D C Voltage Output D C Voltage MIN TYP 115 -3.9 -0.4 MAX 155 U N IT mA V V 2 Advanced Product Information - Revision 0 03/01 ATA7602 AC Electrical Characteristics (VEE=-5.2V+/-0.3V, CDIODE+CSTRAY=0.3PF, LBOND=0.7nH) PAR AMETER Small Si gnal D i fferenti al Transi mpedance (RL = 100 W ) Maxi mum Output Voltage Swi ng (RL = 50 W ) Input C urrent @ 80% Output Saturati on Bandwi dth (-3dB; Iinput <= 1.65mApk-pk) Low Frequency C utoff (1)(4) Group D elay D evi ati on (30kHz to 8.0GHz) Group D elay D evi ati on (30kHz to Fc) (1) (1) MIN 2000 600 550 8.5 TYP 2200 700 MAX U N IT W 800 mVpp m A pp 9.5 30 GHz kHz +15 +25 -19 ps ps dB m dB m -15 -12 -5 dB dB -15 -25 Opti cal Sensi ti vi ty (wi th a PIN Photodi ode) (2)(3)(4)(5) Opti cal Overload (wi th a PIN Photodi ode) (2)(3)(4) Output Return Loss (10MHz to Fc) Output Return Loss (FC to 20GHz) 0 (1) (2) (3) (4) (5) Optical input power = -19 to 0dBm, Fc = 9.5GHz Responsivity of the photodiode = 0.95A/W typical, laser extinction ratio=10dB -10 BER: 10 ; 9.95328Gbps NRZ pattern; PRBS 231-1, l=1.55mm External 1nF Capacitor Required (Cext: see figure 3) Measurements made in reference fixture with open cavity fiber alignment. Improvements in coupling will result in better performance. Advanced Product Information - Revision 0 03/01 3 ATA7602 Pad Description PAD V E E 1, V E E RFIN D C OUT D C OUTB VCTRL C EXT OUT OUTB D escription Negati ve Supply Voltage TIA Input Non-i nverted D C Output Voltage Inverted D C Output Voltage Offset C ontrol -5.2V C omment C onnect to detector anode Feeds i nto External Op-amp for Offset control Feeds i nto External Op-amp for Offset control Use to set relati ve D C offset between the output ports Pad for bondi ng external capaci tor to ground i n C hoose C apaci tor usi ng the order to set low freq. C utoff) attached chart TIA Output Voltage (Non-i nverted) TIA Output Voltage (Inverted) Logi cal '1' wi th opti cal i nput Logi cal '0' wi th opti cal i nput Figure 2: Die Size and layout Die Size: 1075m m x 950 m m 4 Advanced Product Information - Revision 0 03/01 ATA7602 Figure 3: Calculated External Capacitor Size vs. Low Frequency Cutoff 10000 Required Cext (pF) 1000 100 10 0 50 100 150 200 250 300 350 400 Low Cutoff Frequency (kHz) Figure 4: Simulated Bandwidth 70 60 dB(Z(2,1)) 50 40 30 0 2 4 6 8 10 12 14 16 18 20 freq, GHz Advanced Product Information - Revision 0 03/01 5 ATA7602 Figure 5: Simulated Group Delay 1.6E-10 1.4E-10 Z.delay(2,1) 1.2E-10 m2 1.0E-10 m1 freq=3.748GHz Z. delay(2,1)=7.859E-11 m2 freq=2.985E9 Z.delay(2,1)=2.981E-11 delta mode ON m1 8.0E-11 6.0E-11 0 2 4 6 8 10 12 14 16 18 20 freq, GHz Figure 6: Simulated Bandwidth and Group Delay vs. Input Inductance 19.0 18.5 Group Delay (+/- psec) 18.0 17.5 17.0 16.5 16.0 15.5 15.0 14.5 14.0 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 Input Inductance (nH) 10.2 10.4 10.6 10.8 11.0 Bandwidth (GHz) 11.2 6 Advanced Product Information - Revision 0 03/01 ATA7602 Figure 7: Simulated Output Return Loss 0 -10 -20 dB -30 -40 -50 -60 0 2 4 6 8 10 12 14 16 18 20 freq, GHz Ordering Information Part N umber ATA7602D 1 D1 Package Option Die Package D escription Advanced Product Information - Revision 0 03/01 7 ATA7602 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. Preliminary Data Sheet - Revision 1 03/01 8 |
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