GN2014A

GN2014A XFP Tx Signal Conditioner with VCSEL Driver Features • • • • • • • • • • • • • 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 Applications • 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 POLInv LBEn DC OFFSET CORRECTION CIRCUIT 0 EQIP EQIN EQUALIZER PHASE DETECTOR LOS CIRCUIT (Note 1) LOCK DETECTOR CHARGE PUMP/ LOOP FILTER VCO D CLK Q S LBOP LBO BUF LBON SDOP MUX 1 INVERTER SDO BUF SDON LOS LDDisable LOL LBWCtrl LF SWNGSel CPA CPAPol Note 1: The LOS Threshold is set by defualt to 100mVppd. Figure A: GN2014A Block Diagram LINE CARD XFP MODULE 10Gb/s SERDES/ ASIC 10Gb/s GN2003S GN2014A LASER DIODE LINE CARD XFP MODULE PHOTO DIODE LASER DIODE TIA GN1052 10Gb/s GN2003S SERDES/ ASIC 10Gb/s TIA GN1052 PHOTO DIODE 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 1. Pin Configuration and Descriptions 24 LBEn 23 LOL 22 VCOVee 21 VCOVcc 20 LF 19 LBWCtrl LBSDOP 1 POLInv 18 2 RTEn LBSDON 17 3 EQVcc SDOP 16 GN2014A 4 EQVee SDON 15 5 EQInP SDOVee 14 6 EQInN SWNGSel PDVee PDVcc CPAPol LDDisable SDOVcc 13 7 8 9 10 11 12 Figure 1-1: GN2014A Pin Configuration Table 1-1: Pin Descriptions Pin# 1 2 3 4 5 6 7 8 9 10 11 Pin Symbol POLInv RTEn EQVcc EQVee EQInP EQInN PDVcc PDVee SWNGSel CPAPol LDDisable Description SDO Output Polarity Inversion Control Input Retimer Enable Control Input Equalizer Power Supply Equalizer Ground Serial Data Input (Positive) Serial Data Input (Negative) CDR Power Supply CDR Ground Serial Data Output Amplitude Select Control Input Cross Point Adjust Polarity Laser Driver Power Down GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 CPA 3 of 18 Proprietary & Confidential Table 1-1: Pin Descriptions (Continued) Pin# 12 13 14 15 16 17 18 19 20 21 22 23 24 Pin Symbol CPA SDOVcc SDOVee SDON SDOP LBSDON LBSDOP LBWCtrl LF VCOVcc VCOVee LOL LBEn Description Cross Point Adjust SDO Output Buffer Power Supply SDO Output Buffer Ground Serial Data Output (Negative) Serial Data Output (Positive) Loop Back Serial Data Output (Negative) Loop Back Serial Data Output (Positive) PLL Loop Bandwidth Control Input PLL Loop Filter Capacitor VCO Power Supply VCO Ground Loss of Lock Monitor Output 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 Supply Voltage, VCC Input Voltage Range ESD Protection (including high-speed I/Os) Operating Temperature Range, TC Reflow Profile (Tmax) Storage Temperature Value -0.3V to 3.6V -0.3 to VCC+0.3 2kV (HBM) -40°C to 95°C 255°C + 5°C (3 sec) -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 Supply Voltage Power Consumption Symbol VCC – Min -15% – Typ 3.3 300 Max +5% 485 Units V mW Note – – CML Input Specifications Input Amplitude Input Termination VIN – 120 80 – 100 1000 120 mVppd Ω Note 1, Note 2 Differential CML SDO Output Specifications Output Amplitude – 300 (3mA mod current) 80 – – 1500 (15mA mod current) 120 100 mVppd Controlled using Voltage to SwingSel, LDDisable = LOW Output Termination Output with LDDisable = HIGH Swing Select Input Current CPA Input Current – – 100 – Ω μAppd Differential – – – 0 – – – 150 250 μA μA Required for 0 – 1400mVppd output range Required for up to 25% change CML LBSDO Output Specifications Output Amplitude V0LB – IOLB 160 195 300 mVppd Ω mA AC coupled with the LBSDI from GN2003S Differential – Output Termination Output Buffer Switching Current 80 – 100 3.9 120 – Control Logic Input Specifications Input Low Voltage Input High Voltage Input Low Current Input High Current Notes: 1. XFP MSA Revision 4.0 (Table 17). 2. If input signal is below 100mV threshold, LOL may trigger. VIL VIH IIL IIH 0 2.0 – – – – -100 100 0.8 VCC – – V V μA μA – – VIL = 0V VIH = +3.3V, VCC = 3.3V 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 Input Data Rate Input Sinusoidal Jitter Tolerance Symbol – – – – Min 9.95 2.4 0.07 0.07 6 1 Typ – 12.7 0.6 0.45 – – Max 11.3 – – – – 8 Units Gb/s UIpp UIpp UIpp dB MHz Note NRZ f = 120kHz, Note 1 f = 4MHz f = 80MHz Note 2 PRBS 231-1 Data (Note 3) All Frequencies (with 8MHz LBW) – 20% - 80% – Equalization Gain Jitter Transfer Bandwidth Setting Range Jitter Peaking – – – – – 0.03 dB Total Output Jitter SDO Output Rise/Fall Time Lock Time Notes: – tr, tf – – – – 0.1 – 10 0.15 30 20 UIpp ps ms 1. At jitter frequencies 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 Vcc V cc Iref C P A P ol 1 .5 k V re f POLInv or LBEn or RTEn 1.5k Vref 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# 1 Pin Symbol 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 # 11 Pin Symbol 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 0V to 3.0V C 12 Digital to Analog Converter 100nF R3 11k See Table 3-3 for more details 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) 0-0.8 1.2V 1.8V 2.3V 2.8V (Recommended Max) 3.3V (Reliability Max) GN2014A Output (Typical, LDDisable LOW) Comments Soft turn on 150mVpp single ended 350mVpp single ended 500mVpp single ended 750m Vpp single ended Not Recommended 3mA modulation current 7mA modulation current 10mA modulation current 15mA modulation current 18mA modulation max current GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 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 Time (s) 120ps 180ps 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 Time(s) 120ps 180ps 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 Time(s) 120ps 180ps 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 0.25 Package Outline Pin1 2.1 C.L. of package 0.5 2.1 0.25 0.5 0.6 3.8 C.L. of package Metal Area for Paddle Ground 3.8 NOTES: 1. Controlling dimensions in mm. 2. Dimension tolerances are ±0.1 unless otherwise specified. PAD DETAILS 0.3 0.6 Figure 4-1: GN2014A Footprint GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 0.3 4.0 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 GN2014ACNE3 Package 24-pin QFN Case Temperature -40°C to +95°C Revision History Version 3 4 5 ECR 144211 144650 145750 Date February 2007 March 2007 June 2007 Changes and / or Modifications Updated Table 8.1 Missing information on CPAPol Update ESD info, remove reference to Swing Select Control Input in Section 7 Close CAR #5632 Changed Figure 4-2: Package Information. Converted document back to Data Sheet. 6 7 8 148393 152775 154165 November 2007 October 2009 May 2010 GN2014A XFP Tx Signal Conditioner with VCSEL Driver Data Sheet 39260 - 8 May 2010 17 of 18 Proprietary & Confidential DOCUMENT IDENTIFICATION CAUTION ELECTROSTATIC SENSITIVE DEVICES DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION DATA SHEET 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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Sinyi District, Taipei City 11502 Taiwan R.O.C. Phone: (886) 2-8732-8879 Fax: (886) 2-8732-8870 E-mail: gennum-taiwan@gennum.com Gennum Corporation assumes no liability for any errors or omissions in this document, or for the use of the circuits or devices described herein. The sale of the circuit or device described herein does not imply any patent license, and Gennum makes no representation that the circuit or device is free from patent infringement. All other trademarks mentioned are the properties of their respective owners. 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