GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Features Description • SMPTE 424M, SMPTE 292M, SMPTE 344M and SMPTE 259M compliant The GS2978 is a high-speed BiCMOS integrated circuit designed to drive one or two 75Ω co-axial cables. • Dual coaxial cable driving outputs with selectable slew rate • 50Ω differential PECL input • Pb-free and RoHS compliant The GS2978 may drive data rates up to 2.97Gb/s and provides two selectable slew rates in order to achieve compliance to SMPTE 424M, SMPTE 259M, SMPTE 344M and SMPTE 292M. • Seamless interface to other HD-LINX® III family products • Single 3.3V power supply operation • Operating temperature range: 0°C to 70°C Applications • SMPTE 424M, SMPTE 292M, SMPTE 344M and SMPTE 259M Coaxial Cable Serial Digital Interfaces. The GS2978 accepts a LVPECL level differential input that may be AC coupled. External biasing resistors at the inputs are not required. Power consumption is typically 168mW using a 3.3V power supply. The GS2978 is Pb-free, and the encapsulation compound does not contain halogenated flame retardant. This component and all homogeneous subcomponents are RoHS compliant. BANDGAP REFERENCE AND BIASING CIRCUIT DDI DDI INPUT DIFFERENTIAL PAIR RSET SDO OUTPUT STAGE & CONTROL SDO SD/HD DISABLE Functional Block Diagram GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 www.gennum.com 1 of 15 Revision History Version ECR PCN Date 7 151357 − March 2009 Added 2.5k reel option to section 6.6 Ordering Information. Added maximum power consumption value to Table 2-1: DC Electrical Characteristics. 6 150277 − August 2008 Updated data sheet format. Added Tape & Reel Part Number to 6.6 Ordering Information. 5 147849 − October 2007 Changed minimum value of differential input signal amplitude in Section 4.1. 4 147552 − September 2007 3 146309 − July 2007 Corrected part number typo in Ordering Information on page 14. 2 144827 41693 April 2007 Added Table 4-1: RSET vs. VOD. 1 142318 – November 2006 0 140608 – May 2006 B 139766 – March 2006 A 138454 – February 2006 GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 Changes and/or Modifications Changed Input Voltage Swing in Table 2-2: AC Electrical Characteristics. Converting to Data Sheet. Added section 6.4 Solder Reflow Profiles. Added typical ORL values in AC Electrical Characteristics. Changed to Preliminary Data Sheet. Removed references to trial publication for SMPTE 424M. Modified IIH/IILconditions to 10μA in DC Electrical Characteristics and additive jitter in AC Electrical Characteristics. Added section 4.3 Output Return Loss Measurement. Corrected pad standoff height and tolerances for pad width & package dimension. Corrected pad shape. New document. 2 of 15 Contents Features.................................................................................................................................................................1 Applications.........................................................................................................................................................1 Description...........................................................................................................................................................1 Revision History .................................................................................................................................................2 1. Pin Out...............................................................................................................................................................4 1.1 Pin Assignment ..................................................................................................................................4 1.2 Pin Descriptions ................................................................................................................................4 2. Electrical Characteristics ............................................................................................................................5 2.1 Absolute Maximum Ratings ..........................................................................................................5 2.2 DC Electrical Characteristics ........................................................................................................5 2.3 AC Electrical Characteristics ........................................................................................................6 3. Input/Output Circuits ..................................................................................................................................7 4. Detailed Description.....................................................................................................................................8 4.1 Input Interfacing ...............................................................................................................................8 4.2 Output Interfacing ...........................................................................................................................8 4.2.1 Output Amplitude (RSET) ..................................................................................................9 4.2.2 Output Disable.......................................................................................................................9 4.3 Output Return Loss Measurement ..............................................................................................9 5. Application Information .......................................................................................................................... 10 5.1 PCB Layout ....................................................................................................................................... 10 5.2 Typical Application Circuit ........................................................................................................ 10 6. Package & Ordering Information .......................................................................................................... 11 6.1 Package Dimensions ..................................................................................................................... 11 6.2 Recommended PCB Footprint ................................................................................................... 12 6.3 Packaging Data ............................................................................................................................... 12 6.4 Solder Reflow Profiles .................................................................................................................. 13 6.5 Marking Diagram ........................................................................................................................... 14 6.6 Ordering Information ................................................................................................................... 14 GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 3 of 15 1. Pin Out DDI 1 DDI 2 NC NC NC NC 1.1 Pin Assignment 16 15 14 13 12 SDO 11 SDO GS2978 (top view) VEE 3 10 SD/HD RSET 4 9 VCC 7 8 Center Pad (bottom of package) NC RSVD 6 DISABLE NC 5 Figure 1-1: 16-Pin QFN 1.2 Pin Descriptions Table 1-1: Pin Descriptions Pin Number Name Timing Type Description DDI, DDI Analog Input Serial digital differential input. 3 VEE – Power Most negative power supply connection. Connect to GND. 4 RSET Analog Input External output amplitude control resistor. 5,8,13,14, 15,16 NC – – No Connect. Not bonded internally. 7 RSVD – Reserved Do not connect. 6 DISABLE Non Synchronous Input Serial output disable. When asserted LOW, the SDO/SDO output driver is powered off. SDO/SDO will float to VCC through the pull-up resistor. 9 VCC – Power Most positive power supply connection. Connect to +3.3V. 10 SD/HD Non Synchronous Input Output slew rate control. When set HIGH, the output will meet SMPTE 259M rise/fall time specifications. When set LOW, the serial outputs will meet SMPTE424M and SMPTE 292M rise/fall time specifications. 1,2 GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 4 of 15 Table 1-1: Pin Descriptions Pin Number Name Timing Type Description 11,12 SDO, SDO Analog Output Serial digital differential output. – Center Pad – Power Connect to most negative power supply plane following the recommendations in Recommended PCB Footprint on page 12. 2. Electrical Characteristics 2.1 Absolute Maximum Ratings Parameter Value Supply Voltage -0.5V to 3.6 VDC Input ESD Voltage 4kV Storage Temperature Range -50°C < Ts < 125°C Input Voltage Range (any input) -0.3 to (VCC +0.3)V Operating Temperature Range 0°C to 70°C Solder Reflow Temperature 260°C NOTE: Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions or at any other condition beyond those indicated in the AC/DC Electrical Characteristic sections is not implied. 2.2 DC Electrical Characteristics Table 2-1: DC Electrical Characteristics VCC = 3.3V ±5%; TA = 0°C to 70°C, unless otherwise shown Parameter Symbol Conditions Min Typ Max Units Supply Voltage VCC – 3.135 3.3 3.465 V Power Consumption PD TA = 25°C, SDO/SDO enabled – 168 180 mW TA = 25°C, SDO/SDO disabled – 96 – mW TA = 25°C, SDO/SDO enabled – 51 – mA TA = 25°C, SDO/SDO disabled – 29 – mA Common mode – VCC - VOUT – V Supply Current Output Voltage Is VCMOUT GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 5 of 15 Table 2-1: DC Electrical Characteristics VCC = 3.3V ±5%; TA = 0°C to 70°C, unless otherwise shown Parameter Symbol Conditions Min Typ Max Units Input Voltage VCMIN Common mode 1.4 + ΔVDDI/2 – VCC - ΔVDDI/2 V SD/HD, DISABLE Input VIH IIH <= 10 μA 2.0 – – V VIL IIL <= 10 μA – – 0.8 V 2.3 AC Electrical Characteristics Table 2-2: AC Electrical Characteristics VCC = 3.3V ±5%; TA = 0°C to 70°C, unless otherwise shown Parameter Symbol Conditions Min Typ Max Units Notes Serial input data rate DRSDO – – – 2.97 Gb/s 1 Additive jitter – 2.97Gb/s – 22 – psp-p – – 1.485Gb/s – 20 – psp-p – – 270Mb/s – 16 – psp-p – tr, tf SD/HD=0 – – 135 ps 2 tr, tf SD/HD=1 400 – 800 ps 2 Mismatch in rise/fall time Utr, Utf – – – 35 ps – Duty cycle distortion – SD/HD=0, 2.97 Gb/s – – 27 ps 3 – SD/HD=0, 1.485 Gb/s – – 30 ps 3 – SD/HD=1 – – 100 ps 3 – SD/HD=0, – – 10 % 3 – SD/HD=1 – – 8 % 3 ORL 5 MHz – 1.485 GHz 15 20 – dB 4 1.485 GHz – 2.97 GHz 10 12 – dB 4 Rise/Fall time Overshoot Output Return Loss Output Voltage Swing VOUT RSET = 750Ω 750 800 850 mVp-p 3 Input Voltage Swing UVDDI Differential 100 – 2200 mVp-p – NOTES: 1. 2. 3. 4. The input coupling capacitor must be set accordingly for lower data rates. Rise/Fall time measured between 20% and 80%. Single Ended into 75Ω external load. ORL depends on board design. The GS2978 achieves this specification on Gennum's evaluation boards. GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 6 of 15 3. Input/Output Circuits VCC DDI DDI VCC 5k 10k 10k 10k Figure 3-1: Differential Input Stage (DDI/DDI) SDO SDO Vcc IREF Figure 3-2: Differential Output Stage (SDO/SDO) VCC SD/HD On Chip Reference Figure 3-3: Slew Rate Select Input Stage GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 7 of 15 4. Detailed Description 4.1 Input Interfacing DDI/DDI are high impedance differential inputs. The equivalent input circuit is shown in Figure 3-1. Several conditions must be observed when interfacing to these inputs: • The differential input signal amplitude must be between 100 and 2200mVpp. • The common mode voltage range must be as specified in the DC Electrical Characteristics on page 5. • For input trace lengths longer than approximately 1cm, the inputs should be terminated as shown in the Typical Application Circuit. The GS2978 inputs are self-biased, allowing for simple AC coupling to the device. For serial digital video, a minimum capacitor value of 4.7μF should be used to allow coupling of pathological test signals. A tantalum capacitor is recommended. SD/HD Input Pin The GS2978 SDO rise and fall times can be set to comply with both SMPTE 259M/344M and SMPTE 424M / SMPTE 292M. For all SMPTE 259M standards, or any data rate that requires longer rise and fall time characteristics, the SD/HD pin must be set HIGH by the application layer. For SMPTE 424M and SMPTE 292M standards and signals which require faster rise and fall times, this pin should be set LOW. 4.2 Output Interfacing The GS2978 outputs are current mode, and will drive typically 800mV into a 75Ω load. These outputs are protected from accidental static damage with internal ESD protection diodes. In order for a DDI output circuit using the GS2978 to meet this specification, the output application circuit shown in Typical Application Circuit on page 10 is recommended. The value of LCOMP will vary depending on the PCB layout, with a typical value of 5.6nH. A 4.7μF capacitor is used for AC coupling the output of the device. This value is chosen to ensure that pathological signals can be coupled without a significant DC component occurring. Please see Application Information on page 10 for more details. GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 8 of 15 4.2.1 Output Amplitude (RSET) The output amplitude of the GS2978 can be adjusted by changing the value of the RSET resistor as shown in Table 4-1. For an 800mVp-p output with a nominal ±7% tolerance, a value of 750Ω is required. A ±1% SMT resistor should be used. The RSET resistor is part of the high speed output circuit of the GS2978. The resistor should be placed as close as possible to the RSET pin. In addition, the PCB capacitance should be minimized at this node by removing the PCB groundplane beneath the RSET resistor and the RSET pin. Table 4-1: RSET vs. VOD RSET R (Ω) Output Swing (mVp-p) 995 608 824 734 750 800 680 884 573 1040 NOTE: For reliable operation of the GS2978 over the full temperature range, do not use an RSET value below 573Ω. 4.2.2 Output Disable The serial output disable (DISABLE), disables power to the current mode serial digital output driver. When asserted LOW, the SDO/SDO output driver is powered off. SDO/SDO will float to VCC through the pull-up resistor. NOTE: If the DISABLE pin is left as a No Connect (NC), the SDO/SDO outputs are still active. 4.3 Output Return Loss Measurement To perform a practical return loss measurement, it is necessary to force the GS2978 output to a DC high or low condition. The actual measured return loss will be based on the outputs being static at VCC or VCC-1.6V. Under normal operating conditions the outputs of the device swing between VCC-0.4V and VCC-1.2V. GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 9 of 15 5. Application Information 5.1 PCB Layout Special attention must be paid to component layout when designing serial digital interfaces for HDTV. An FR-4 dielectric can be used, however, controlled impedance transmission lines are required for PCB traces longer than approximately 1cm. Note the following PCB artwork features used to optimize performance: • The PCB trace width for HD rate signals is closely matched to SMT component width to minimize reflections due to changes in trace impedance. • The PCB ground plane is removed under the GS2978 output components to minimize parasitic capacitance. • The PCB ground plane is removed under the GS2978 RSET pin and resistor to minimize parasitic capacitance. • Input and output BNC connectors are surface mounted in-line to eliminate a transmission line stub caused by a BNC mounting via high speed traces which are curved to minimize impedance variations due to change of PCB trace width. 5.2 Typical Application Circuit 5.6n* 75 4u7 49.9 10n 1 2 3 4 6 49.9 DIFFERENTIAL DATA INPUT 4u7 BNC 4u7 GS2978 DDI SDO SDO DDI VEE SD/HD RSET VCC DISABLE VCC 12 11 10 9 75 10n 75 75 BNC 5.6n* 4u7 VCC 750 * TYPICAL VALUE: VARIES WITH LAYOUT VCC 10n DISABLE SD/HD NOTE: All resistors in Ohms, capacitors in Farads, and inductors in Henrys, unless otherwise noted. Figure 5-1: Typical Application Circuit GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 10 of 15 6. Package & Ordering Information 6.1 Package Dimensions A 2.76+/-0.10 0.40+/-0.05 4.00+/-0.05 DATUM A PIN 1 AREA 2X 2.76+/-0.10 4.00+/-0.05 B CENTER TAB DETAIL B 0.15 C 2X DATUM B 0.15 C 0.35+/-0.05 0.65 0.20 REF 16X 0.10 C C 0.10 CAB 0.05 C DATUM A OR B 16X 0.08 C SEATING PLANE 0.65/2 0.00-0.05 0.85+/-0.05 TERMINAL TIP GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 0.65 DETAIL B SCALE:NTS 11 of 15 6.2 Recommended PCB Footprint 0.35 0.65 0.55 3.70 2.76 CENTER PAD NOTE: All dimensions are in millimeters. 2.76 3.70 The Center Pad should be connected to the most negative power supply plane (VEE) by a minimum of 5 vias. NOTE: Suggested dimensions only. Final dimensions should conform to customer design rules and process optimizations. 6.3 Packaging Data Parameter Value Package Type 4mm x 4mm 16-pin QFN Package Drawing Reference JEDEC M0220 Moisture Sensitivity Level 3 Junction to Case Thermal Resistance, θj-c 31.0°C/W Junction to Air Thermal Resistance, θj-a (at zero airflow) 43.8°C/W Psi, Ψ 11.0°C/W Pb-free and RoHS compliant Yes GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 12 of 15 6.4 Solder Reflow Profiles The device is manufactured with Matte-Sn terminations and is compatible with both standard eutectic and Pb-free solder reflow profiles. MSL qualification was performed using the maximum Pb-free reflow profile shown in Figure 6-1.The recommended standard Pb reflow profile is shown in Figure 6-2. Temperature 60-150 sec. 20-40 sec. 260°C 250°C 3°C/sec max 217°C 6°C/sec max 200°C 150°C 25°C Time 60-180 sec. max 8 min. max Figure 6-1: Maximum Pb-free Solder Reflow Profile (Preferred) 60-150 sec. Temperature 10-20 sec. 230°C 220°C 3°C/sec max 183°C 6°C/sec max 150°C 100°C 25°C Time 120 sec. max 6 min. max Figure 6-2: Standard Pb Reflow Profile GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 13 of 15 6.5 Marking Diagram Pin 1 Indicator GS 2978 XXXXE3 YYWW XXXX - Lot/Work Order ID YYWW - Date Code YY 2-digit year WW 2-digit week number 6.6 Ordering Information Part Number Package Temperature Range GS2978 GS2978-CNE3 16-pin QFN 0°C to 70°C GS2978 GS2978-CTE3 16-pin QFN 250pc Reel 0°C to 70°C GS2978 GS2978-CNTE3Z 16-pin QFN 2,500pc Reel 0°C to 70°C GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 14 of 15 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. DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION GENNUM CORPORATE HEADQUARTERS Phone: +1 (905) 632-2996 Fax: +1 (905) 632-2055 4281 Harvester Road, Burlington, Ontario L7L 5M4 Canada E-mail: [email protected] www.gennum.com OTTAWA SNOWBUSH IP - A DIVISION OF GENNUM GERMANY 232 Herzberg Road, Suite 101 Kanata, Ontario K2K 2A1 Canada 439 University Ave. Suite 1700 Toronto, Ontario M5G 1Y8 Canada Hainbuchenstraße 2 80935 Muenchen (Munich), Germany Phone: +49-89-35831696 Phone: +1 (613) 270-0458 Phone: +1 (416) 925-5643 Fax: +49-89-35804653 Fax: +1 (613) 270-0429 Fax: +1 (416) 925-0581 E-mail: [email protected] CALGARY E-mail: [email protected] 3553 - 31st St. N.W., Suite 210 Calgary, Alberta T2L 2K7 Canada Web Site: http://www.snowbush.com Phone: +1 (403) 284-2672 UNITED KINGDOM MEXICO 288-A Paseo de Maravillas Jesus Ma., Aguascalientes Mexico 20900 NORTH AMERICA WESTERN REGION Bayshore Plaza 2107 N 1st Street, Suite #300 San Jose, CA 95131 United States Phone: +1 (408) 392-9454 Phone: +1 (416) 848-0328 Fax: +1 (408) 392-9427 JAPAN KK E-mail: [email protected] NORTH AMERICA EASTERN REGION Fax: +44 1279 714171 Shinjuku Green Tower Building 27F 6-14-1, Nishi Shinjuku Shinjuku-ku, Tokyo, 160-0023 Japan INDIA Phone: +81 (03) 3349-5501 Phone: +1 (905) 632-2996 #208(A), Nirmala Plaza, Airport Road, Forest Park Square Bhubaneswar 751009 India Fax: +81 (03) 3349-5505 Fax: +1 (905) 632-2055 E-mail: [email protected] E-mail: [email protected] Phone: +91 (674) 653-4815 TAIWAN Fax: +91 (674) 259-5733 6F-4, No.51, Sec.2, Keelung Rd. Sinyi District, Taipei City 11502 Taiwan R.O.C. North Building, Walden Court Parsonage Lane, Bishop’s Stortford Hertfordshire, CM23 5DB United Kingdom Phone: +44 1279 714170 Web Site: http://www.gennum.co.jp 4281 Harvester Road Burlington, Ontario L7L 5M4 Canada KOREA 8F Jinnex Lakeview Bldg. 65-2, Bangidong, Songpagu Seoul, Korea 138-828 Phone: +82-2-414-2991 Phone: (886) 2-8732-8879 Fax: +82-2-414-2998 Fax: (886) 2-8732-8870 E-mail: [email protected] E-mail: [email protected] 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 GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 15 of 15 15