GN2014A XFP Tx Signal Conditioner with VCSEL Driver Features Applications • • • • • • • • • • • • • • XFP Datacom Compliant Transmit Signal Conditioner Integrated VCSEL driver with Cross Point Adjust functionality to optimize optical performance Single 3.3V supply Power dissipation: 300mW (typical, assuming 700mVppd data output amplitude) Multi-rate operation: 9.95Gb/s – 11.3Gb/s No reference clock required Laser shut down option Automatic input offset correction On chip 100Ω differential I/O termination Loss of Lock indicator Loopback differential output CDR Bypass Option Bit Inversion capability Transmit path signal conditioner for XFP and SFP+ transceiver modules General Description The GN2014A is a transmit path signal conditioner with integrated VCSEL driver designed to offer power and cost savings relative to external laser driver solutions. The GN2014A provides integrated modulation and eye shaping capability while maintaining pin compatibility with previous generation parts. RTEn LBEn POLInv LBOP DC OFFSET CORRECTION CIRCUIT LBO BUF 0 EQIP EQIN LBON S SDOP MUX D EQUALIZER PHASE DETECTOR LOS CIRCUIT (Note 1) CHARGE PUMP/ LOOP FILTER VCO CLK Q SDO BUF INVERTER SDON 1 LOCK DETECTOR LOS LDDisable LBWCtrl LOL LF SWNGSel Note 1: The LOS Threshold is set by defualt to 100mVppd. CPA CPAPol Figure A: GN2014A Block Diagram LINE CARD LINE CARD XFP MODULE 10Gb/s GN2014A SERDES/ ASIC 10Gb/s GN2003S TIA GN1052 XFP MODULE LASER DIODE PHOTO DIODE PHOTO DIODE LASER DIODE TIA GN1052 10Gb/s GN2003S SERDES/ ASIC 10Gb/s GN2014A Figure B: Typical Usage GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 www.gennum.com 1 of 18 Proprietary & Confidential Contents Features.................................................................................................................................................................1 Applications.........................................................................................................................................................1 General Description ..........................................................................................................................................1 1. Pin Configuration and Descriptions........................................................................................................3 2. Electrical Characteristics ............................................................................................................................5 2.1 DC Electrical Characteristics ........................................................................................................6 2.2 AC Electrical Characteristics ........................................................................................................7 3. Detailed Description.....................................................................................................................................8 3.1 Typical Electrical Application Schematic .................................................................................8 3.2 VCO Supply Recommendations ..................................................................................................9 3.3 Control Interface ...............................................................................................................................9 3.3.1 GN2014A Laser Driver Power Down.......................................................................... 11 3.4 GN2014A Data Output Driver Swing Control ...................................................................... 11 3.5 GN2014A Cross Point Adjust ..................................................................................................... 13 4. Packaging and Ordering Information.................................................................................................. 15 4.1 Package Dimensions ..................................................................................................................... 15 4.2 Ordering Information ................................................................................................................... 17 Revision History .............................................................................................................................................. 17 GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 2 of 18 Proprietary & Confidential 24 23 22 21 20 19 LBEn LOL VCOVee VCOVcc LF LBWCtrl 1. Pin Configuration and Descriptions 1 POLInv LBSDOP 18 2 RTEn LBSDON 17 3 EQVcc SDOP 16 GN2014A SDOVee 14 6 EQInN SDOVcc 13 CPA EQInP LDDisable 5 CPAPol 15 SWNGSel SDON PDVee EQVee PDVcc 4 7 8 9 10 11 12 Figure 1-1: GN2014A Pin Configuration Table 1-1: Pin Descriptions Pin# Pin Symbol Description 1 POLInv SDO Output Polarity Inversion Control Input 2 RTEn Retimer Enable Control Input 3 EQVcc Equalizer Power Supply 4 EQVee Equalizer Ground 5 EQInP Serial Data Input (Positive) 6 EQInN Serial Data Input (Negative) 7 PDVcc CDR Power Supply 8 PDVee CDR Ground 9 SWNGSel Serial Data Output Amplitude Select Control Input 10 CPAPol Cross Point Adjust Polarity 11 LDDisable Laser Driver Power Down GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 3 of 18 Proprietary & Confidential Table 1-1: Pin Descriptions (Continued) Pin# Pin Symbol Description 12 CPA Cross Point Adjust 13 SDOVcc SDO Output Buffer Power Supply 14 SDOVee SDO Output Buffer Ground 15 SDON Serial Data Output (Negative) 16 SDOP Serial Data Output (Positive) 17 LBSDON Loop Back Serial Data Output (Negative) 18 LBSDOP Loop Back Serial Data Output (Positive) 19 LBWCtrl PLL Loop Bandwidth Control Input 20 LF PLL Loop Filter Capacitor 21 VCOVcc VCO Power Supply 22 VCOVee VCO Ground 23 LOL Loss of Lock Monitor Output 24 LBEn Loop Back Enable Control Input GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 4 of 18 Proprietary & Confidential 2. Electrical Characteristics Table 2-1: Absolute Maximum Ratings Parameter Value Supply Voltage, VCC -0.3V to 3.6V Input Voltage Range -0.3 to VCC+0.3 ESD Protection (including high-speed I/Os) 2kV (HBM) Operating Temperature Range, TC -40°C to 95°C Reflow Profile (Tmax) 255°C + 5°C (3 sec) Storage Temperature -40°C to 100°C NOTE: Stress above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not applied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 5 of 18 Proprietary & Confidential 2.1 DC Electrical Characteristics Table 2-2: DC Electrical Characteristics VCC = +2.8V to +3.47V, TC = -40°C to 95°C. Typical values are at VCC = +3.3V and TA = 25°C, unless otherwise specified. Note: mVppd refers to mV peak-to-peak differential value. Parameter Symbol Min Typ Max Units VCC -15% 3.3 +5% V – – – 300 485 mW – VIN 120 – 1000 mVppd – 80 100 120 Ω Output Amplitude – 300 (3mA mod current) – 1500 (15mA mod current) mVppd Output Termination – 80 100 120 Ω Output with LDDisable = HIGH – – – 100 μAppd Swing Select Input Current – 0 – 150 μA Required for 0 – 1400mVppd output range CPA Input Current – – – 250 μA Required for up to 25% change V0LB 160 195 300 mVppd – 80 100 120 Ω IOLB – 3.9 – mA – Supply Voltage Power Consumption Note CML Input Specifications Input Amplitude Input Termination Note 1, Note 2 Differential CML SDO Output Specifications Controlled using Voltage to SwingSel, LDDisable = LOW Differential – CML LBSDO Output Specifications Output Amplitude Output Termination Output Buffer Switching Current AC coupled with the LBSDI from GN2003S Differential Control Logic Input Specifications Input Low Voltage VIL 0 – 0.8 V – Input High Voltage VIH 2.0 – VCC V – Input Low Current IIL – -100 – μA VIL = 0V Input High Current IIH – 100 – μA VIH = +3.3V, VCC = 3.3V Notes: 1. XFP MSA Revision 4.0 (Table 17). 2. If input signal is below 100mV threshold, LOL may trigger. GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 6 of 18 Proprietary & Confidential 2.2 AC Electrical Characteristics Table 2-3: AC Electrical Characteristics VCC = +2.8V to +3.47V, TC = -40°C to 95°C. Typical values are at VCC = +3.3V and TA = 25°C, unless otherwise specified. Note: mVppd refers to mV peak-to-peak differential value. Parameter Symbol Min Typ Max Units Input Data Rate – 9.95 – 11.3 Gb/s NRZ Input Sinusoidal Jitter Tolerance – 2.4 12.7 – UIpp f = 120kHz, Note 1 – 0.07 0.6 – UIpp f = 4MHz – 0.07 0.45 – UIpp f = 80MHz Equalization Gain – 6 – – dB Jitter Transfer Bandwidth Setting Range – 1 – 8 MHz Jitter Peaking – – – 0.03 dB Total Output Jitter – – 0.1 0.15 UIpp tr, tf – – 30 ps 20% - 80% – – 10 20 ms – SDO Output Rise/Fall Time Lock Time Note Note 2 PRBS 231-1 Data (Note 3) All Frequencies (with 8MHz LBW) – Notes: 1. At jitter frequencies <120kHz the GN2014A jitter tolerance performance exceeds the XFI module transmitter input telecom sinusoidal jitter tolerance specifications (XFP MSA Revision 4.0, Figure 16). 2. At 5.35GHz (dielectric loss) 3. 8MHz bandwidth can be obtained using the loop filter components R1, R2. The values for these components should be selected at module level. GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 7 of 18 Proprietary & Confidential 3. Detailed Description 3.1 Typical Electrical Application Schematic R5 (Note 1) VCC 3.9 C12 4.7μ C2 220n C1 100n Loss of Lock Loopback Enable From/To Controller R1 (Note 3) open R2 (Note 3) 68.1k R (Note 5) R (Note 5) 1k Polarity Inversion 19 LBWCtrl 20 LF 21 VCOVee VCOVcc SDOVcc 7 PDVcc 100n CPA EQInN 12 EQInN SDON SDOVee LDDisable 6 SDOP EQInP 11 100n C10 EQVee CPAPol 5 10 4 U1 GN2014A EQVcc 8 C7 EQInP LBSDON RTEn SWINGSel 3 C5 10n LBSDOP POLInv PDVee 2 9 1 VCC 22 23 LBEn 1k LOL 24 1k Retimer Enable R (Note 5) 18 LBSDOP 17 LBSDON To GN2003S (Note 2) 16 C6 SDOP 100n 15 C9 14 C8 10n 13 SDON 100n VCC Notes: 1. All passive components are surface mount components with the 0402 footprint size. C11 Output Swing Select Cross Point Adjust Polarity From/To Controller R3 11k Laser Driver Disable (Note 4) Cross Point Adjust 2. AC coupling between Loop Back I/Os is recommended for new designs. VCC C12 100n 10n 3. Value of this component should be optomized according to design requirements. R (Note 5) 1k R4 4. Laser Driver Disable may be connected directly to ground. R (Note 5) 1k DAC 10k C13 100n 5. This resistor should be populated only if any of the following conditions apply: w This particular input is controlled by a separate supply source w This particular input is controlled by the device powered using a separate source and its output is capable of sourcing current >40mA Figure 3-1: GN2014A Typical Electrical Application Schematic The application schematic for the GN2014A is highly related to the GN2004S. GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 8 of 18 Proprietary & Confidential 3.2 VCO Supply Recommendations When the Host Board Power Supply output is used to power the GN2014A device, additional filtering for the VCOVcc supply input is recommended. This filtering is required to improve power line noise rejection. Typically, a 1st order RC filter provides sufficient supply noise attenuation (i.e. R5, C1 and C12 in Figure 3-1). The capacitor C1 = 100nF The capacitor C12 = 4.7μF The maximum value of the resistor R5 can be calculated using the following information: • Minimum operational voltage (after regulation and including supply noise) at the VCOVcc supply input (pin 21): VCOVcc (min) = 2.74Vdc • Maximum operational current into the VCOVcc supply input: IVCOVcc (max) = 14.9mA Example 3-1: Calculating Resistor Values Vcc = 2.8Vdc. R5 (max) = (Vcc - VCOVcc (min)) / IVCOVcc (max) = 60mV / 14.9mA = 4Ω The closest lower standard resistor value, which can be used for R5 is 3.9Ω. When an external LDO voltage regulator is used to power the GN2014A device, R5 = 3.3 Control Interface The GN2014A control interface consists of five inputs that determine the mode in which the device is operating: • Polarity Inversion (POLInv) • Loop Back Enable (LBEn) • Retimer Enable (RTEn) • Cross Point Adjust Polarity (CPAPol) Table 3-1 describes the conditions at these inputs to enable or disable a particular mode. Figure 3-2 shows a simplified equivalent circuit common for all control inputs. GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 9 of 18 Proprietary & Confidential V cc Vcc Iref C P A P ol 1.5k POLInv or 1 .5 k V re f Vref LBEn or RTEn Figure 3-2: GN2014A Control Input Equivalent Circuits When left unconnected, the POLInv, LBEn and RTEn input level defaults to logic HIGH and the CPAPol input defaults to logic LOW (see Figure 7-1). Note: Since the GN2014A device is specified to operate at VCC values down to 2.8V, special care must be taken when driving control inputs from a controller that uses separate supply line. Under no condition should the controller's VOH exceed GN2014A's VCC + 0.3V. Table 3-1: Operational Modes Pin# Pin Symbol 1 POLInv Description Serial Data Output Polarity Inversion Control Input 0 → Inverted Polarity (SDOP/LBSDOP = EQInN and SDON/LBSDON = EQInP) 1 → Normal Polarity (SDOP/LBSDOP = EQInP and SDON/LBSDON = EQInN) 2 RTEn Retimer Enable Control Input 0 → CDR Bypassed 1 → CDR In Path 10 CPAPol Cross Point Adjust Polarity Control Input 0 → Negative Cross Point Adjust 1 → Positive Cross Point Adjust 24 LBEn Loop Back Enable Control Input 0 → Loop Back Disabled (Data available only on SDOP/SDON) 1 → Loop Back Enabled (Data available on SDOP/SDON and LBSDOP/LBSDON) GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 10 of 18 Proprietary & Confidential 3.3.1 GN2014A Laser Driver Power Down LDDisable is a digital control pin which is used to shut down laser modulation when set to HIGH (default level). When set to LOW, the driver operates normally. Table 3-2: Control Logic Input Specifications Pin # Pin Symbol 11 LDDisable Description Laser Driver Power Down 1 → Laser Driver power down (Default) 0 → Laser Driver enabled 3.4 GN2014A Data Output Driver Swing Control The GN2014A Data Output amplitude is controlled using the SWNGSel control pin. The SWNGSel control application circuit is shown in Figure 3-3. Output voltage from a DAC, applied to the SWNGSel control input via external resistor R3, is used to control the Data Output amplitude of the GN2014. Table 3-3 shows expected GN2014A Data Output amplitude for a given SWNGSel voltage. Note: The DAC should be able to source up to150μA of current. GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 11 of 18 Proprietary & Confidential Digital to Analog Converter 0V to 3.0V C 12 R3 100nF See Table 3-3 for more details 11k 9 SWNGSel 10k To Current Mirror Q1 Q2 1k 1k GN2014A Figure 3-3: GN2014A SWNGSel Control Application Circuit Table 3-3: GN2014A Output Amplitude vs. Swing Select Voltage Swing Select Voltage at DAC (assumes 11kΩ resistor in series) GN2014A Output (Typical, LDDisable LOW) 0-0.8 Soft turn on 1.2V 150mVpp single ended 3mA modulation current 1.8V 350mVpp single ended 7mA modulation current 2.3V 500mVpp single ended 10mA modulation current 2.8V (Recommended Max) 750m Vpp single ended 15mA modulation current 3.3V (Reliability Max) Not Recommended 18mA modulation max current GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 Comments 12 of 18 Proprietary & Confidential 3.5 GN2014A Cross Point Adjust The GN2014A cross point adjust is used to pre-distort the output signal to optimize optical performance. This is accomplished using two control pins: 1. CPAPol (Pin 10) — Controls direction of crosspoint change, digital pin 2. CPA (Pin 12) — Controls magnitude of crosspoint change, analog control With CPA voltage set to nominal 0.8V, the output waveform will have a cross point at the 50% level, as indicated in Figure 3-4. 75% 50% Crossing Point is at 50% Level 25% 0ps 60ps 120ps 180ps Time (s) Figure 3-4: GN2014A Output Signal with CPA voltage set to 0.8V To increase the cross point to the 75% level, the CPA polarity (pin 10:CPAPol) must be set HIGH, and the CPA voltage (pin 12:CPA) increased to 3.1V. This results in the output waveform illustrated in Figure 3-5. Crosspoint 75% 50% 25% 0ps 60ps 120ps 180ps Time(s) Figure 3-5: GN2014A Output Signal when CPA Polarity control input is set HIGH, CPA = 3.1V The cross point can be set to an intermediate level between 50% and 75% by setting the CPA to a voltage between 0.8V and 3.1V. GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 13 of 18 Proprietary & Confidential To decrease the cross point to the 25% level, the CPA polarity (pin 10:CPAPol) must be set LOW, and the CPA voltage (pin 12:CPA) increased to 3.1V. This results in the output waveform illustrated in Figure 3-6. Crosspoint 75% 50% 25% 0ps 60ps 120ps 180ps Time(s) Figure 3-6: GN2014A Output Signal when CPA Polarity control input is set LOW, CPA = 3.1V The cross point can be set to an intermediate level between 50% and 25% by setting the CPA to a voltage between 0.8V and 3.1V. Note: When the CPA Control function is not used, connect CPA (pin 12: CPA) to VCC using a 200KΩ resistor. The CPAPol pin (pin 10: CPAPol) may be left open. GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 14 of 18 Proprietary & Confidential 4. Packaging and Ordering Information 4.1 Package Dimensions Figure 4-1 shows the GN2014A footprint. 4.0 Package Outline 0.25 Pin1 0.25 2.1 C.L. of package 4.0 3.8 0.5 C.L. of package 2.1 Metal Area for Paddle Ground 0.5 3.8 NOTES: 1. Controlling dimensions in mm. 2. Dimension tolerances are ±0.1 unless otherwise specified. PAD DETAILS 0.3 0.3 0.6 0.6 Figure 4-1: GN2014A Footprint GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 15 of 18 Proprietary & Confidential Figure 4-2: Package Information GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 16 of 18 Proprietary & Confidential Pin 1 Indicator GN2014A XXXXE3 YYWW GENNUM GN2014A XXXX YYWW E3 Package Mark Last 4 digits of work order Date Code Pb-free indicator Figure 4-3: Package Marking 4.2 Ordering Information Part Number Package Case Temperature GN2014ACNE3 24-pin QFN -40°C to +95°C Revision History Version ECR Date Changes and / or Modifications 3 144211 February 2007 Updated Table 8.1 4 144650 March 2007 Missing information on CPAPol 5 145750 June 2007 Update ESD info, remove reference to Swing Select Control Input in Section 7 6 148393 November 2007 Close CAR #5632 7 152775 October 2009 Changed Figure 4-2: Package Information. 8 154165 May 2010 Converted document back to Data Sheet. GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 17 of 18 Proprietary & Confidential DOCUMENT IDENTIFICATION CAUTION DATA SHEET ELECTROSTATIC SENSITIVE DEVICES The product is in production. Gennum reserves the right to make changes to the product at any time without notice to improve reliability, function or design, in order to provide the best product possible. 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GENNUM and the Gennum logo are registered trademarks of Gennum Corporation. © Copyright 2006 Gennum Corporation. All rights reserved. www.gennum.com GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 18 of 18 18 Proprietary & Confidential