19-0406; Rev 2; 2/08 KIT ATION EVALU E L B AVAILA 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables Features ♦ No Power Supply Required The MAX3787 is a 1Gbps to 12.5Gbps equalization network that compensates for transmission medium losses encountered with FR4 and cables. The equalization network is composed entirely of passive components and functions equally well for 8b/10b or scrambled signals. It is packaged in a small 1.5mm x 1.5mm chipscale package (UCSP™) that can be placed anywhere along the transmission medium to increase jitter margin for high-speed interconnects. Roughly the size of two 0603 components, the MAX3787 easily provides placement and routing flexibility. At 8.5Gbps, the MAX3787 compensates for spans up to 18in of FR4 and 7m of cable. At 12.5Gbps, the MAX3787 compensates for spans up to 12in of FR4 and 3m of cable. Input and output impedance is 100Ω differential. The MAX3787 requires no power and operates over a -40°C to +125°C temperature range. ♦ Small 1.5mm x 1.5mm Chip-Scale Package ♦ Passive Equalization Reduces ISI ♦ Operates from 1Gbps to 12.5Gbps ♦ Extends Board Link ♦ Extends Cable Link ♦ Coding Independent, 8b/10b or Scrambled Ordering Information PART PINPACKAGE TEMP RANGE PKG CODE MAX3787ABL -40°C to +125°C 4 UCSP B9-7 MAX3787AWL+ -40°C to +125°C 4 WLP W91B1+3 +Denotes a lead-free package. Applications Pin Configuration Backplane Interconnect Compensation TOP VIEW Cable Interconnect Compensation Chip-to-Chip Link Extensions 1 2 3 A Ethernet and Fibre-Channel Serial Modules OUT+ IN+ Chassis Life Extension B MAX3787 C IN- UCSP is a trademark of Maxim Integrated Products, Inc. OUT- UCSP/WLP Typical Application Circuits LINE CARD ALL PASSIVE BACKPLANE INTERCONNECT (100Ω) Tx IN+ IN- MAX3787 OUT+ OUT- (100Ω) Rx OUT+ OUT- MAX3787 IN+ IN- SWITCH CARD 100Ω FR4 Rx (100Ω) 100Ω FR4 Tx (100Ω) Typical Application Circuits continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX3787 General Description MAX3787 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables ABSOLUTE MAXIMUM RATINGS Voltage between (IN+ and OUT+) or (IN- and OUT-) ..............+2V Voltage between (IN+ and IN-) or (OUT+ and OUT-) ..............+4V Voltage between (IN+ and OUT-) or (IN- and OUT+) ..............+4V Continuous Power Dissipation (TA = +70°C) 4-Bump UCSP (derate 3.0mW/°C above +70°C) .........238mW Operating Junction Temperature........................................+150°C Storage Ambient Temperature Range .................-55°C to +150°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. OPERATING CONDITIONS PARAMETER Operating Ambient Temperature SYMBOL CONDITIONS TA Bit Rate NRZ data CID Tolerance Consecutive identical digits MIN TYP MAX -40 +25 +125 °C 12.5 Gbps 100 Bits MAX UNITS 1 UNITS ELECTRICAL CHARACTERISTICS (Specifications guaranteed over specified operating conditions. Typical values measured at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN Supply Current Input Swing TYP 0.0 Measured differentially at point A in Figure 1 mA 3600 mVP-P Compensation 5GHz relative to 100MHz 6 dB Input Impedance Differential, ZLOAD = 100Ω 100 Ω Output Impedance Differential, ZSOURCE = 100Ω 100 Ω Through Response Relative to ideal load, see Figure 2 for setup Input Return Loss 100MHz to 6GHz 15 dB Output Return Loss 100MHz to 6GHz 15 dB Resistance IN+ to IN- and OUT+ to OUT- No load, high impedance on all ports 112 152 Ω Resistance IN+ to OUT+ and IN- to OUT- No load, high impedance on all ports 32 44 Ω Resistance IN+ to OUT- and IN- to OUT+ No load, high impedance on all ports 112 152 Ω DC Gain (OUT/IN) ZLOAD = 100Ω 0.5 3.125Gbps and 6.25Gbps, 18in of 6mil microstrip FR4 0.05 8.5Gbps, 10.0Gbps, and 12.5Gbps, 18in of 6mil microstrip FR4 0.10 Residual Deterministic Jitter (Table 1, Notes 1, 2) See Figure 3 for limits UI Note 1: Signal applied differentially at point A as shown in Figure 1. The deterministic jitter at point B is from media-induced loss, not from clock-source modulation. Deterministic jitter is measured at the 50% vertical level of the signal at point C. Note 2: Difference in deterministic jitter between reference points A and C in Figure 1. Stress pattern: 27 PRBS, 100 zeros, 1, 0, 1, 0, 27 PRBS, 100 ones, 0, 1, 0, 1. 2 _______________________________________________________________________________________ 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables SIGNAL SOURCE MAX3787 ROGERS 4350 BOARD FR4 TEST BOARD OSCILLOSCOPE 0in ≤ L ≤ 18in MAX3787 SEE TABLE 1 FOR PCB PARAMETERS. A C B REPRESENTS EDGE-MOUNTED SMA CONNECTOR. Figure 1. Residual Deterministic Jitter Test Circuit ROGERS 4350 BOARD VNA SOURCE 1in DUAL 50Ω MICROSTRIP LINE 1in DUAL 50Ω MICROSTRIP LINE VNA DETECTOR MAX3787 REPRESENTS EDGE-MOUNTED SMA CONNECTOR. Figure 2. Frequency Response Test Circuit Using Vector Network Analyzer (VNA) _______________________________________________________________________________________ 3 FREQUENCY MIN (dB) TYP (dB) MAX (dB) 100MHz -8.2 -7.4 -6.8 200MHz -7.9 -7.0 -6.4 300MHz -7.5 -6.6 -6.0 500MHz -6.8 -6.0 -5.3 1.0GHz -5.5 -4.8 -4.2 2.0GHz -4.2 -3.2 -2.5 3.0GHz -3.1 -2.2 -1.5 4.0GHz -2.3 -1.5 -0.8 -6 5.0GHz -2.1 -1.3 -0.5 -7 5.5GHz -2.4 -1.6 -0.6 -8 6.0GHz -2.9 -2.1 -1.1 -9 6.5GHz — -2.6 — 7.0GHz — -3.1 — 7.5GHz — -3.6 — 8.0GHz — -4.1 — 8.5GHz — -4.7 — 9.0GHz — -5.5 — 9.5GHz — -7.0 — 10.0GHz — -9.0 — THROUGH-RESPONSE LIMITS (RELATIVE TO IDEAL LOAD) 0 -1 -2 -3 S21 (dB) MAX3787 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables MAX -4 -5 TYP MIN 0 1 2 3 4 5 6 7 8 9 10 FREQUENCY (GHz) Figure 3. Through Response Limits Table 1. PCB Assumptions (Board Material is FR4) PARAMETER CONDITIONS Transmission Line Edge-coupled microstrip line Relative Permittivity at 1GHz Loss Tangent MIN TYP MAX UNITS 6 mil FR4 or similar 4.0 — FR4 or similar 0.02 — Metal Thickness 1oz copper 1.4 mil Impedance Differential 4 90 100 _______________________________________________________________________________________ 110 Ω 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables (TA = +25°C, unless otherwise noted. All measurements were done with 1VP-P at the source. Stress pattern: 27 PRBS, 100 zeros, 1, 0, 1, 0, 27 PRBS, 100 ones, 0, 1, 0, 1. Residual deterministic jitter graphs were measured using Tektronix’s FrameScan®. Deterministic jitter of the system was subtracted from the measured value. Eye diagrams acquired by FrameScan include deterministic jitter of the system (approximately 9ps) but not random jitter. Twin-ax cable: Amphenol Spectra-Strip® Skewclear® 100Ω 24AWG.) VERTICAL EYE OPENING vs. LENGTH (4.25Gbps, STRESS PATTERN) WITHOUT EQUALIZER 700 600 500 400 WITH EQUALIZER 300 200 700 600 500 400 WITH EQUALIZER 300 200 100 0 0 5 WITHOUT EQUALIZER 10 15 20 25 30 35 40 45 50 900 MAX3787toc03 800 100 0 MAX3787toc02 800 900 VERTICAL EYE OPENING vs. LENGTH (10.3125Gbps, STRESS PATTERN) 800 VERTICAL EYE OPENING (mVP-P) 700 WITHOUT EQUALIZER 600 500 400 WITH EQUALIZER 300 200 100 0 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 FR4 BOARD LENGTH (in) EYE DIAGRAM OF UNEQUALIZED SIGNAL (18in FR4, 12.5Gbps, STRESS PATTERN) EYE DIAGRAM OF EQUALIZED SIGNAL (18in FR4, 12.5Gbps, STRESS PATTERN) EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (18in FR4, 12.5Gbps, STRESS PATTERN) 50mV/div MAX3787toc05 120mV/div 120mV/div 14ps/div EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (12in FR4, 12.5Gbps, STRESS PATTERN) 60mV/div 120mV/div MAX3787toc08 EYE DIAGRAM OF EQUALIZED SIGNAL (12in FR4, 12.5Gbps, STRESS PATTERN) MAX3787toc07 120mV/div 14ps/div 14ps/div EYE DIAGRAM OF UNEQUALIZED SIGNAL (12in FR4, 12.5Gbps, STRESS PATTERN) 14ps/div MAX3787toc06 FR4 BOARD LENGTH (in) MAX3787toc04 FR4 BOARD LENGTH (in) MAX3787toc09 VERTICAL EYE OPENING (mVP-P) 900 VERTICAL EYE OPENING (mVP-P) MAX3787toc01 1000 VERTICAL EYE OPENING vs. LENGTH (8.5Gbps, STRESS PATTERN) 14ps/div 14ps/div FrameScan is a registered trademark of Tektronix. Spectra-Strip and Skewclear are registered trademarks of Amphenol. _______________________________________________________________________________________ 5 MAX3787 Typical Operating Characteristics Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted. All measurements were done with 1VP-P at the source. Stress pattern: 27 PRBS, 100 zeros, 1, 0, 1, 0, 27 PRBS, 100 ones, 0, 1, 0, 1. Residual deterministic jitter graphs were measured using Tektronix’s FrameScan. Deterministic jitter of the system was subtracted from the measured value. Eye diagrams acquired by FrameScan include deterministic jitter of the system (approximately 9ps) but not random jitter. Twin-ax cable: Amphenol Spectra-Strip Skewclear 100Ω 24AWG.) EYE DIAGRAM OF EQUALIZED SIGNAL (18in FR4, 10.3125Gbps, STRESS PATTERN) 120mV/div EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (12in FR4, 10.3125Gbps, STRESS PATTERN) 60mV/div MAX3787toc15 MAX3787toc14 120mV/div 120mV/div 18ps/div EYE DIAGRAM OF EQUALIZED SIGNAL (12in FR4, 10.3125Gbps, STRESS PATTERN) MAX3787toc13 EYE DIAGRAM OF UNEQUALIZED SIGNAL (12in FR4, 10.3125Gbps, STRESS PATTERN) 18ps/div 18ps/div EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (18in FR4, 8.5Gbps, STRESS PATTERN) EYE DIAGRAM OF EQUALIZED SIGNAL (18in FR4, 8.5Gbps, STRESS PATTERN) 50mV/div 120mV/div MAX3787toc16 MAX3787toc17 EYE DIAGRAM OF UNEQUALIZED SIGNAL (18in FR4, 8.5Gbps, STRESS PATTERN) MAX3787toc18 18ps/div 6 MAX3787toc12 50mV/div MAX3787toc10 120mV/div 18ps/div 18ps/div 22ps/div EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (18in FR4, 10.3125Gbps, STRESS PATTERN) MAXt3787toc11 EYE DIAGRAM OF UNEQUALIZED SIGNAL (18in FR4, 10.3125Gbps, STRESS PATTERN) 120mV/div MAX3787 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables 22ps/div 22ps/div _______________________________________________________________________________________ 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables (TA = +25°C, unless otherwise noted. All measurements were done with 1VP-P at the source. Stress pattern: 27 PRBS, 100 zeros, 1, 0, 1, 0, 27 PRBS, 100 ones, 0, 1, 0, 1. Residual deterministic jitter graphs were measured using Tektronix’s FrameScan. Deterministic jitter of the system was subtracted from the measured value. Eye diagrams acquired by FrameScan include deterministic jitter of the system (approximately 9ps) but not random jitter. Twin-ax cable: Amphenol Spectra-Strip Skewclear 100Ω 24AWG.) EYE DIAGRAM OF EQUALIZED SIGNAL (12in FR4, 8.5Gbps, STRESS PATTERN) EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (12in FR4, 8.5Gbps, STRESS PATTERN) 22ps/div 22ps/div 22ps/div EYE DIAGRAM OF EQUALIZED SIGNAL (18in FR4, 6.25Gbps, STRESS PATTERN) MAX3787toc24 50mV/div 120mV/div MAX3787toc22 120mV/div 28ps/div EYE DIAGRAM OF UNEQUALIZED SIGNAL (12in FR4, 6.25Gbps, STRESS PATTERN) 28ps/div EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (12in FR4, 6.25Gbps, STRESS PATTERN) 60mV/div 120mV/div MAX3787toc26 MAX3787toc25 EYE DIAGRAM OF EQUALIZED SIGNAL (12in FR4, 6.25Gbps, STRESS PATTERN) MAX3787toc27 28ps/div 120mV/div EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (18in FR4, 6.25Gbps, STRESS PATTERN) MAX3787toc23 EYE DIAGRAM OF UNEQUALIZED SIGNAL (18in FR4, 6.25Gbps, STRESS PATTERN) 28ps/div MAX3787toc21 60mV/div 120mV/div 120mV/div MAX3787toc19 MAX3787toc20 EYE DIAGRAM OF UNEQUALIZED SIGNAL (12in FR4, 8.5Gbps, STRESS PATTERN) 28ps/div 28ps/div _______________________________________________________________________________________ 7 MAX3787 Typical Operating Characteristics (continued) Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted. All measurements were done with 1VP-P at the source. Stress pattern: 27 PRBS, 100 zeros, 1, 0, 1, 0, 27 PRBS, 100 ones, 0, 1, 0, 1. Residual deterministic jitter graphs were measured using Tektronix’s FrameScan. Deterministic jitter of the system was subtracted from the measured value. Eye diagrams acquired by FrameScan include deterministic jitter of the system (approximately 9ps) but not random jitter. Twin-ax cable: Amphenol Spectra-Strip Skewclear 100Ω 24AWG.) 40ps/div 40ps/div 40ps/div MAX3787toc33 60mV/div 120mV/div 120mV/div EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (12in FR4, 4.25Gbps, STRESS PATTERN) MAX3787toc32 EYE DIAGRAM OF EQUALIZED SIGNAL (12in FR4, 4.25Gbps, STRESS PATTERN) MAX3787toc31 EYE DIAGRAM OF UNEQUALIZED SIGNAL (12in FR4, 4.25Gbps, STRESS PATTERN) 40ps/div 40ps/div EYE DIAGRAM OF EQUALIZED SIGNAL (5m TWIN-AX CABLE, 10.3125Gbps, STRESS PATTERN) EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (5m TWIN-AX CABLE, 10.3125Gbps, STRESS PATTERN) MAX3787toc36 50mV/div 120mV/div MAX3787toc34 MAX3787toc35 EYE DIAGRAM OF UNEQUALIZED SIGNAL (5m TWIN-AX CABLE, 10.3125Gbps, STRESS PATTERN) 8 MAX3787toc30 50mV/div 120mV/div 120mV/div 40ps/div 18ps/div EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (18in FR4, 4.25Gbps, STRESS PATTERN) MAX3787toc29 EYE DIAGRAM OF EQUALIZED SIGNAL (18in FR4, 4.25Gbps, STRESS PATTERN) MAX3787toc28 EYE DIAGRAM OF UNEQUALIZED SIGNAL (18in FR4, 4.25Gbps, STRESS PATTERN) 120mV/div MAX3787 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables 18ps/div 18ps/div _______________________________________________________________________________________ 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables (TA = +25°C, unless otherwise noted. All measurements were done with 1VP-P at the source. Stress pattern: 27 PRBS, 100 zeros, 1, 0, 1, 0, 27 PRBS, 100 ones, 0, 1, 0, 1. Residual deterministic jitter graphs were measured using Tektronix’s FrameScan. Deterministic jitter of the system was subtracted from the measured value. Eye diagrams acquired by FrameScan which include deterministic jitter of the system (approximately 9ps) but not random jitter. Twin-ax cable: Amphenol Spectra-Strip Skewclear 100Ω 24AWG.) MAX3787toc38 60mV/div 120mV/div 120mV/div 18ps/div 18ps/div EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (7m TWIN-AX CABLE, 8.5Gbps, STRESS PATTERN) EYE DIAGRAM OF UNEQUALIZED SIGNAL (5m TWIN-AX CABLE, 8.5Gbps, STRESS PATTERN) EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (5m TWIN-AX CABLE, 8.5Gbps, STRESS PATTERN) EYE DIAGRAM OF EQUALIZED SIGNAL (5m TWIN-AX CABLE, 8.5Gbps, STRESS PATTERN) 50mV/div 120mV//div MAX3787toc44 MAX3787toc43 120mV//div 22ps/div 22ps/div MAX3787toc45 22ps/div 50mV/div 120mV/div 120mV/div MAX3787toc41 EYE DIAGRAM OF EQUALIZED SIGNAL (7m TWIN-AX CABLE, 8.5Gbps, STRESS PATTERN) MAX3787toc40 EYE DIAGRAM OF UNEQUALIZED SIGNAL (7m TWIN-AX CABLE, 8.5Gbps, STRESS PATTERN) MAX3787toc42 18ps/div 22ps/div MAX3787toc39 EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (3m TWIN-AX CABLE, 10.3125Gbps, STRESS PATTERN) EYE DIAGRAM OF EQUALIZED SIGNAL (3m TWIN-AX CABLE, 10.3125Gbps, STRESS PATTERN) MAX3787toc37 EYE DIAGRAM OF UNEQUALIZED SIGNAL (3m TWIN-AX CABLE, 10.3125Gbps, STRESS PATTERN) 22ps/div 22ps/div _______________________________________________________________________________________ 9 MAX3787 Typical Operating Characteristics (continued) Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted. All measurements were done with 1VP-P at the source. Stress pattern: 27 PRBS, 100 zeros, 1, 0, 1, 0, 27 PRBS, 100 ones, 0, 1, 0, 1. Residual deterministic jitter graphs were measured using Tektronix’s FrameScan. Deterministic jitter of the system was subtracted from the measured value. Eye diagrams acquired by FrameScan include deterministic jitter of the system (approximately 9ps) but not random jitter. Twin-ax cable: Amphenol Spectra-Strip Skewclear 100Ω 24AWG.) 50mV/div MAX3787toc50 40ps/div 50mV/div 120mV/div 120mV/div MAX3787toc51 EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (5m TWIN-AX CABLE, 4.25Gbps, STRESS PATTERN) EYE DIAGRAM OF EQUALIZED SIGNAL (5m TWIN-AX CABLE, 4.25Gbps, STRESS PATTERN) MAX3787toc49 EYE DIAGRAM OF UNEQUALIZED SIGNAL (5m TWIN-AX CABLE, 4.25Gbps, STRESS PATTERN) 40ps/div 40ps/div EYE DIAGRAM OF EQUALIZED SIGNAL (0in FR4, 10Gbps, STRESS PATTERN) 100mV/div 100mV/div MAX3787toc53 MAX3787toc54 EYE DIAGRAM OF EQUALIZED SIGNAL (0in FR4, 5Gbps, STRESS PATTERN) MAX3787toc52 EYE DIAGRAM OF EQUALIZED SIGNAL (0in FR4, 1Gbps, STRESS PATTERN) 160ps/div MAX3787toc48 MAX3787toc47 MAX3787toc46 120mV/div 120mV/div 40ps/div 40ps/div 40ps/div 10 EYE DIAGRAM OF EQUALIZED SIGNAL (ZOOM) (7m TWIN-AX CABLE, 4.25Gbps, STRESS PATTERN) EYE DIAGRAM OF EQUALIZED SIGNAL (7m TWIN-AX CABLE, 4.25Gbps, STRESS PATTERN) EYE DIAGRAM OF UNEQUALIZED SIGNAL (7m TWIN-AX CABLE, 4.25Gbps, STRESS PATTERN) 100mV/div MAX3787 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables 34ps/div 18ps/div ______________________________________________________________________________________ 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables (TA = +25°C, unless otherwise noted. All measurements were done with 1VP-P at the source. Stress pattern: 27 PRBS, 100 zeros, 1, 0, 1, 0, 27 PRBS, 100 ones, 0, 1, 0, 1. Residual deterministic jitter graphs were measured using Tektronix’s FrameScan. Deterministic jitter of the system was subtracted from the measured value. Eye diagrams acquired by FrameScan include deterministic jitter of the system (approximately 9ps) but not random jitter. Twin-ax cable: Amphenol Spectra-Strip Skewclear 100Ω 24AWG.) DIFFERENTIAL S22 vs. FREQUENCY -20 -1 -2 DIFFERENTIAL S21 (dB) -5 DIFFERENTIAL S22 (dB) -15 0 MAX3787toc56 MAX3787toc55 -10 -10 -15 -20 -3 -4 -5 -6 -7 -8 -25 -25 -9 -10 -30 -30 6 7 8 9 0 10 1 2 3 4 5 6 7 8 9 10 0 1 2 FREQUENCY (GHz) FREQUENCY (GHz) 5 6 7 8 9 10 RESIDUAL DETERMINISTIC JITTER vs. FR4 BOARD LENGTH STRESS PATTERN 25 20 4.25Gbps 3.125Gbps 2.125Gbps 1Gbps 5 30 RESIDUAL DETERMINISTIC JITTER (ps) 30 10 4 FREQUENCY (GHz) RESIDUAL DETERMINISTIC JITTER vs. FR4 BOARD LENGTH 15 3 0 MAX3787toc59 5 STRESS PATTERN 12.5Gbps 25 10.3125Gbps 20 8.5Gbps 15 6.25Gbps 10 5 0 5 10 15 20 25 30 10 15 20 25 FR4 BOARD LENGTH (in) RESIDUAL DETERMINISTIC JITTER vs. FR4 BOARD LENGTH RESIDUAL DETERMINISTIC JITTER vs. FR4 BOARD LENGTH 30 RPAT PATTERN 25 20 15 5 FR4 BOARD LENGTH (in) 4.25Gbps 3.125Gbps 10 2.125Gbps 1Gbps 5 0 30 RPAT PATTERN 12.5Gbps 25 30 MAX3787toc61 4 RESIDUAL DETERMINISTIC JITTER (ps) 3 MAX3787toc58 2 MAX3787toc60 1 RESIDUAL DETERMINISTIC JITTER (ps) 0 RESIDUAL DETERMINISTIC JITTER (ps) DIFFERENTIAL S11 (dB) -5 DIFFERENTIAL S21 vs. FREQUENCY 0 MAX3787toc57 DIFFERENTIAL S11 vs. FREQUENCY 0 10.3125Gbps 20 8.5Gbps 6.25Gbps 15 10 5 0 5 10 15 20 FR4 BOARD LENGTH (in) 25 30 5 10 15 20 25 30 FR4 BOARD LENGTH (in) ______________________________________________________________________________________ 11 MAX3787 Typical Operating Characteristics (continued) Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted. All measurements were done with 1VP-P at the source. Stress pattern: 27 PRBS, 100 zeros, 1, 0, 1, 0, 27 PRBS, 100 ones, 0, 1, 0, 1. Residual deterministic jitter graphs were measured using Tektronix’s FrameScan. Deterministic jitter of the system was subtracted from the measured value. Eye diagrams acquired by FrameScan include deterministic jitter of the system (approximately 9ps) but not random jitter. Twin-ax cable: Amphenol Spectra-Strip Skewclear 100Ω 24AWG.) RESIDUAL DETERMINISTIC JITTER vs. TWIN-AX CABLE LENGTH RESIDUAL DETERMINISTIC JITTER vs. TWIN-AX CABLE LENGTH 25 20 4.25Gbps 15 10 1Gbps 2.125Gbps 3.125Gbps 5 30 STRESS PATTERN 12.5Gbps 25 10.3125Gbps 20 8.5Gbps 6.25Gbps 15 10 5 0 0 2 3 4 5 6 1 7 2 3 4 5 6 TWIN-AX CABLE LENGTH (m) TWIN-AX CABLE LENGTH (m) RESIDUAL DETERMINISTIC JITTER vs. TWIN-AX CABLE LENGTH RESIDUAL DETERMINISTIC JITTER vs. TWIN-AX CABLE LENGTH RPAT PATTERN 25 20 15 4.25Gbps 3.125Gbps 2.125Gbps 10 1Gbps 5 0 7 30 MAX3787toc65 MAX3787toc64 30 RESIDUAL DETERMINISTIC JITTER (ps) 1 RPAT PATTERN 25 20 6.25Gbps 8.5Gbps 12.5Gbps 10.3125Gbps 15 10 5 0 1 2 3 4 5 TWIN-AX CABLE LENGTH (m) 12 MAX3787toc63 STRESS PATTERN RESIDUAL DETERMINISTIC JITTER (ps) MAX3787toc62 RESIDUAL DETERMINISTIC JITTER (ps) 30 RESIDUAL DETERMINISTIC JITTER (ps) MAX3787 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables 6 7 1 2 3 4 5 6 7 TWIN-AX CABLE LENGTH (m) ______________________________________________________________________________________ 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables PIN NAME FUNCTION A1 IN+ A3 OUT+ Positive Data Input Positive Data Output C1 IN- Negative Data Input C3 OUT- Negative Data Output Z1 MAX3787 ESD DIODES OUT+ IN+ MAX3787 Z2 AT 0Hz (DC) Z1 = OPEN, Z2 = 0Ω OUT+ IN+ EQUALIZATION NETWORK IN- IN- OUT- OUTZ1 ESD DIODES Figure 5. ESD Protection Diodes Figure 4. Functional Diagram Detailed Description The MAX3787 is an entirely passive network composed of both resistive and reactive components (Figure 4). Two symmetric-T networks with bypassing for highpass characteristics are used to create a differential symmetric-H network. The entire network acts as a filter specifically tuned to compensate for transmission medium losses encountered with FR4 and cables. Input and Output Terminations The MAX3787 input impedance is 100Ω differential with the output connected to a 100Ω differential load. The network is designed for 100Ω-balanced differential signals and is not intended for single-ended transmission. ESD Protection Diodes The MAX3787 contains ESD diodes that bypass the equalization network in case of static discharge (Figure 5). Due to the symmetry of the equalization network, signals can pass from IN to OUT or OUT to IN with the same compensation. The equalizer can also be placed at the beginning or end of the transmission medium and provide the same compensation at the receiving circuit. For example, two equalizers can be placed in one transceiver module, one for the transmit path and one for the receive path (see Typical Application Circuits). UCSP Assembly Considerations For the latest application details on UCSP construction, dimensions, tape carrier information, PCB techniques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on reliability testing results, refer to Application Note 1891: UCSP–A Wafer-Level Chip-Scale Package available on Maxim’s website at www.maxim-ic.com/ucsp. Applications Information Equalizer Integration and Placement The MAX3787 is packaged in a small 1.5mm x 1.5mm UCSP that can be placed anywhere along the transmission medium. The small size allows placement and routing flexibility. Chip Information TRANSISTOR COUNT: 0 PROCESS: SiGe BiPOLAR ______________________________________________________________________________________ 13 MAX3787 Pin Description 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables MAX3787 Typical Application Circuits (continued) FIBRE-CHANNEL HOST BUS ADAPTER ALL PASSIVE COPPER-CABLE ASSEMBLY (100Ω) Tx (100Ω) Rx 100Ω 24AWG TWIN-AX CABLE 100Ω 24AWG TWIN-AX CABLE EQ FIBRE-CHANNEL FABRIC SWITCH MAX3787 EQ Rx (100Ω) Tx (100Ω) MAX3787 Package Information (For the latest package outline information, go to www.maxim-ic.com/packages.) PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 4 UCSP B9-7 21-0093 4 WLP W91B1+3 21-0067 14 ______________________________________________________________________________________ 1Gbps to 12.5Gbps Passive Equalizer for Backplanes and Cables REVISION NUMBER REVISION DATE 0 7/05 1 12/05 2 2/08 DESCRIPTION PAGES CHANGED Initial release. — Added lead-free package to Ordering Information table. 1 In the Ordering Information table, changed lead-free part number from ABL+ to AWL+; added WLP package information. 1, 14 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX3787 Revision History