ATA7602 10GB/s Offset Control TIA Advanced Product Information - Rev 0 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 MIN TYP MAX U N IT V D C Power supply (VEE) -7.0 1.0 Storage Temperature -65 125 D C Input C urrent o C 3.0 mA Operating Conditions PAR AMETER Operati ng Voltage Range Operati ng Temperature Range MIN TYP MAX U N IT -5.50 -5.2 -4.90 V -40 85 o Photodi ode C apaci tance (PIN + stray) 0.3 pF Seri es Resi stance (Bondwi re + anode) 15 W Bondwi re Inductance 1.0 nH C DC Characteristics PAR AMETER 2 MIN TYP MAX U N IT Supply C urrent (D C C oupled) 115 155 mA Input D C Voltage -3.9 V Output D C Voltage -0.4 V 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 MIN TYP Small Si gnal D i fferenti al Transi mpedance (RL = 100 W ) 2000 2200 Maxi mum Output Voltage Swi ng (RL = 50 W ) 600 700 Input C urrent @ 80% Output Saturati on 550 Bandwi dth (-3dB; Iinput <= 1.65mApk-pk) 8.5 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) Output Return Loss (10MHz to Fc) W 800 mVpp m A pp 9.5 GHz 30 kHz +15 ps -25 +25 ps -19 dB m 0 dB m -15 Output Return Loss (FC to 20GHz) (1) (2) (3) (4) (5) U N IT -15 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) MAX -12 dB -5 dB 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 D escription C omment V E E 1, V E E Negati ve Supply Voltage -5.2V RFIN TIA Input C onnect to detector anode D C OUT Non-i nverted D C Output Voltage Feeds i nto External Op-amp for Offset control D C OUTB Inverted D C Output Voltage Feeds i nto External Op-amp for Offset control VCTRL Offset C ontrol Use to set relati ve D C offset between the output ports C EXT 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 OUT TIA Output Voltage (Non-i nverted) Logi cal '1' wi th opti cal i nput OUTB TIA Output Voltage (Inverted) 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 Required Cext (pF) 10000 1000 100 10 0 50 100 150 200 250 300 350 400 16 18 Low Cutoff Frequency (kHz) Figure 4: Simulated Bandwidth 70 dB(Z(2,1)) 60 50 40 30 0 2 4 6 8 10 12 14 20 freq, GHz Advanced Product Information - Revision 0 03/01 5 ATA7602 Figure 5: Simulated Group Delay 1.6E-10 Z.delay(2,1) 1.4E-10 m1 freq=3.748GHz Z. delay(2,1)=7.859E-11 1.2E-10 m2 m2 freq=2.985E9 Z.delay(2,1)=2.981E-11 delta mode ON 1.0E-10 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 11.2 19.0 11.0 18.0 17.5 10.8 17.0 16.5 10.6 16.0 15.5 10.4 15.0 14.5 14.0 10.2 0.4 0.5 0.6 0.7 0.8 0.9 1 Input Inductance (nH) 6 Advanced Product Information - Revision 0 03/01 1.1 Bandwidth (GHz) Group Delay (+/- psec) 18.5 ATA7602 Figure 7: Simulated Output Return Loss 0 -10 dB -20 -30 -40 -50 -60 0 2 4 6 8 10 12 14 16 18 20 freq, GHz Ordering Information Part N umber ATA7602D 1 Package Option D1 Package D escription Die 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 [email protected] 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