GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Features Description * SMPTE 292M, SMPTE 344M and SMPTE 259M compliant * Dual coaxial cable driving outputs with selectable slew rate The GS1578A is a second generation high speed BiCMOS integrated circuit designed to drive one or two 75 co-axial cables. * 50 differential PECL input * Pb-free and RoHS compliant * Seamless interface to other HD-LINX(R) II family products * Single 3.3V power supply operation * Operating temperature range: 0C to 70C Applications * SMPTE 292M, SMPTE 344M and SMPTE 259M Coaxial Cable Serial Digital Interfaces The GS1578A may drive data rates up to 1.485Gb/s and provides two selectable slew rates in order to achieve compliance to SMPTE 259M, SMPTE 344M and SMPTE 292M. The GS1578A 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 GS1578A 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 SDI SDI INPUT DIFFERENTIAL PAIR RSET SDO OUTPUT STAGE & CONTROL SDO SD/HD Figure A: GS1578A Functional Block Diagram GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 www.gennum.com 1 of 16 Proprietary & Confidential Revision History Version ECR PCN Date Changes and/or Modifications 5 153754 - November 2009 4 139637 38695 March 2006 3 139113 38124 January 2006 2 137885 - September 2005 1 137132 - June 2005 0 136045 - February 2005 Converted to Preliminary Data Sheet. A 135502 - February 2005 New document. Updated to latest Gennum template. Corrected pad standoff height and tolerances for pad width & package dimension. Corrected pad shape. Corrected Input Differential Swing to 2200mV. Corrected process to BiCMOS. Updated eye diagrams in Section 5.2. Converted to Data Sheet. Changed title of Figure 3-2 to clarify that it is the Pb reflow profile. Updated SD additive jitter number in the AC electrical characteristics table to be typically 20psp-p. Updated dimensions on center pad of the PCB footprint in Section 7.2 to match the dimensions of the center pad of the device. Corrected part number in ordering information. Rephrased the RoHS Compliant statement. Contents Features.................................................................................................................................................................1 Applications.........................................................................................................................................................1 Description...........................................................................................................................................................1 Revision History .................................................................................................................................................2 1. Pin Out...............................................................................................................................................................4 1.1 GS1578A Pin Assignment ..............................................................................................................4 1.2 GS1578A 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. Solder Reflow Profiles..................................................................................................................................7 4. Input / Output Circuits ................................................................................................................................8 5. Detailed Description.....................................................................................................................................9 5.1 Input Interfacing ...............................................................................................................................9 5.2 Output Interfacing ...........................................................................................................................9 5.3 Output Return Loss Measurement ........................................................................................... 11 5.4 Output Amplitude (RSET) ........................................................................................................... 12 6. Application Information .......................................................................................................................... 13 6.1 PCB Layout ....................................................................................................................................... 13 6.2 Typical Application Circuit ........................................................................................................ 13 7. Package and Ordering Information...................................................................................................... 14 GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 2 of 16 Proprietary & Confidential 7.1 Package Dimensions ..................................................................................................................... 14 7.2 Recommended PCB Footprint ................................................................................................... 15 7.3 Packaging Data ............................................................................................................................... 15 7.4 Ordering Information ................................................................................................................... 16 GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 3 of 16 Proprietary & Confidential 1. Pin Out SDI 1 SDI 2 NC NC NC NC 1.1 GS1578A Pin Assignment 16 15 14 13 12 SDO 11 SDO GS1578A (top view) VEE 3 10 SD / HD RSET 4 9 VCC 8 Center Pad (bottom of package) NC NC NC 7 NC 6 5 Figure 1-1: 16-Pin QFN 1.2 GS1578A Pin Descriptions Table 1-1: Pin Descriptions Pin Number Name Timing Type Description SDI, SDI 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. 5,6,7,8,13,14, 15,16 NC - - No Connect. Not bonded internally. 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 SMPTE 292M rise/fall time specifications. 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 15. 1,2 GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 4 of 16 Proprietary & Confidential 2. Electrical Characteristics 2.1 Absolute Maximum Ratings Table 2-1 lists the absolute maximum ratings for the GS1578A. Conditions exceeding the limits listed 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 implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2-1: Absolute Maximum Ratings Parameter Value Supply Voltage -0.5V to +3.6 VDC Input ESD Voltage 2kV Storage Temperature Range -50C < Ts < 125C Input Voltage Range (any input) -0.3 to (VCC +0.3)V Operating Temperature Range 0C to 70C Solder Reflow Temperature 260C Supply Voltage -0.5V to +3.6 VDC 2.2 DC Electrical Characteristics Table 2-2 shows the DC electrical characteristics of the GS1578A where conditions are VDD = 3.3V 5%, TA = 0C to 70C, unless otherwise shown. Table 2-2: DC Electrical Characteristics Parameter Symbol Conditions Min Typ Max Units Supply Voltage VCC - 3.135 3.3 3.465 V Power Consumption PD TA = 25C - 168 - mW Supply Current Is TA = 25C - 51 64 mA Output Voltage VCMOUT Common mode - VCC - VOUT - V VCMIN Common mode 1.6 + VSDI/2 - VCC VSDI/2 V VIH - 2.4 - - V VIL - - - 0.8 V Input Voltage SD/HD Input GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 5 of 16 Proprietary & Confidential 2.3 AC Electrical Characteristics Table 2-3 shows the AC electrical characteristics of the GS1578A where conditions are VDD = 3.3V, TA = 0C to 70C, unless otherwise shown. Table 2-3: AC Electrical Characteristics Parameter Symbol Conditions Min Typ Max Units Notes DRSDO - - - 1.485 Gb/s 1 - 1.485Gb/s - 22 - psp-p - - 270Mb/s - 20 - psp-p - tr, tf SD/HD=0 - - 220 ps 2 tr, tf SD/HD=1 400 - 800 ps 2 Utr, Utf - - - 30 ps - - SD/HD=0 - - 30 ps - - SD/HD=1 - - 100 ps - - SD/HD=0 - - 10 % - - SD/HD=1 - - 8 % - Output Return Loss ORL - 15 - - dB - Output Voltage Swing VOUT Single Ended into 75 external load 750 800 850 mVp-p - 300 - 2000 mVp-p - Serial input data rate Additive jitter Rise/Fall time Mismatch in rise/fall time Duty cycle distortion Overshoot RSET = 750 Input Voltage Swing UVSDI Differential NOTES: 1. The input coupling capacitor must be set accordingly for lower data rates. 2. Rise/Fall time measured between 20% and 80%. GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 6 of 16 Proprietary & Confidential 3. 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 3-1.The recommended standard Pb reflow profile is shown in Figure 3-2. Temperature 60-150 sec. 20-40 sec. 260C 250C 3C/sec max 217C 6C/sec max 200C 150C 25C Time 60-180 sec. max 8 min. max Figure 3-1: Maximum Pb-free Solder Reflow Profile (Preferred) 60-150 sec. Temperature 10-20 sec. 230C 220C 3C/sec max 183C 6C/sec max 150C 100C 25C Time 120 sec. max 6 min. max Figure 3-2: Standard Pb Reflow Profile (Pb-free package) GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 7 of 16 Proprietary & Confidential 4. Input / Output Circuits VCC SDI SDI VCC 10k 5k 10k 10k Figure 4-1: Differential Input Stage (SDI/SDI) Vcc SDO SDO IREF Figure 4-2: Differential Output Stage (SDO/SDO) VCC SD/HD On Chip Reference Figure 4-3: Slew Rate Select Input Stage GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 8 of 16 Proprietary & Confidential 5. Detailed Description 5.1 Input Interfacing SDI/SDI are high impedance differential inputs. The equivalent input circuit is shown in Figure 4-1. Several conditions must be observed when interfacing to these inputs: * The differential input signal amplitude must be between 300 and 2000mVp-p. * 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 GS1578A inputs are self-biased, allowing for simple AC coupling to the device. For serial digital video, a minimum capacitor value of 4.7F should be used to allow coupling of pathological test signals. A tantalum capacitor is recommended. SD/HD Input Pin The GS1578A SDO rise and fall times can be set to comply with both SMPTE 259M/344M and 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 292M standards and signals which require faster rise and fall times, this pin should be set LOW. 5.2 Output Interfacing The GS1578A outputs are current mode, and will drive 800mV into a 75 load. These outputs are protected from accidental static damage with internal static protection diodes. The SMPTE 292M, SMPTE 344M and SMPTE 259M standards require that the output of a cable driver have a source impedance of 75 and a return loss of at least 15dB between 5MHz and 1.485GHz. In order for an SDI output circuit using the GS1578A to meet this specification, the output application circuit shown in Typical Application Circuit on page 13 is recommended. The value of LCOMP will vary depending on the PCB layout, with a typical value of 5.6nH. A 4.7F capacitor is used for AC coupling the output of the device. This value is chosen GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 9 of 16 Proprietary & Confidential to ensure that pathological signals can be coupled without a significant DC component occurring. Please see Application Information on page 13 for more details. Figure 5-1: Output Signal for 270Mb/s Input Figure 5-2: Output Signal for 1.485Gb/s Input The output protection diodes act as a varactor (voltage controlled capacitor) as shown in Figure 5-3. Therefore, when measuring return loss at the GS1578A output, it is necessary to take the measurement for both a logic high and a logic low output condition. GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 10 of 16 Proprietary & Confidential Consequently, the output capacitance of the device is dependent on the logic state of the output. GS1578A SDO SDO Figure 5-3: Static Protection Diodes 5.3 Output Return Loss Measurement To perform a practical return loss measurement, it is necessary to force the GS1578A 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, so the measured value of return loss will not represent the actual operating return loss. A simple method of calculating the values of actual operating return loss is to interpolate the two return loss measurements. In this way, the values of return loss are estimated at VCC-0.4V and VCC-1.2V based on the measurements at VCC and VCC-1.6V. The two values of return loss (high and low) will typically differ by several decibels. If the measured return loss is RH for logic high and RL for logic low, then the two values can be interpolated as follows: RIH = RH- (RH-RL)/4 and RIL = RL+(RH-RL)/4 where RIH is the interpolated logic high value and RIL is the interpolated logic low value. For example, if RH = -18dB and RL = -14dB, then the interpolated values are RIH = -17dB and RIL = -15dB. GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 11 of 16 Proprietary & Confidential 5.4 Output Amplitude (RSET) The output amplitude of the GS1578A is set to 800mVp-p with a tolerance of 7% using an RSET resistor of 750. A 1% SMT resistor should be used. The RSET resistor is part of the high speed output circuit of the GS1578A. 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. NOTE: Only an RSET value of 750 1% should be used. Using other values for RSET is not recommended. GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 12 of 16 Proprietary & Confidential 6. Application Information 6.1 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 groundplane is removed under the GS1578A output components to minimize parasitic capacitance. * The PCB ground plane is removed under the GS1578A 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. 6.2 Typical Application Circuit GS1578A 4u7 49.9 10n 1 2 3 4 49.9 DIFFERENTIAL DATA INPUT 4u7 * 5.6n 75 SDI SDI VEE RSET BNC 4u7 VCC SDO SDO SD/HD VCC 12 11 10 9 75 10n 75 75 BNC * 5.6n 4u7 VCC 750 * TYPICAL VALUE: VARIES WITH LAYOUT VCC 10n SD/HD NOTE: All resistors in Ohms, capacitors in Farads, and inductors in Henrys, unless otherwise noted. Figure 6-1: Typical Application Circuit GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 13 of 16 Proprietary & Confidential 7. Package and Ordering Information 7.1 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 DATUM B 0.15 C 2X 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 0.65 DETAIL B SCALE:NTS Figure 7-1: GS1578A Package Dimensions GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 14 of 16 Proprietary & Confidential 7.2 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. 7.3 Packaging Data Table 7-1: 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, j-c 31.0C/W Junction to Air Thermal Resistance, j-a (at zero airflow) 43.8C/W Psi 11.0C/W Pb-free and RoHS compliant Yes GS1578A HD-LINX(R) II Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 33657 - 5 November 2009 15 of 16 Proprietary & Confidential 7.4 Ordering Information Table 7-2: Ordering Information GS1578A Part Number Package Temperature Range GS1578ACNE3 16-pin QFN 0C to 70C 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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Sinyi District, Taipei City 11502 Taiwan R.O.C. 8F Jinnex Lakeview Bldg. 65-2, Bangidong, Songpagu Seoul, Korea 138-828 Phone: +44 1279 714170 E-mail: gennum-japan@gennum.com Phone: (886) 2-8732-8879 Fax: (886) 2-8732-8870 4281 Harvester Road Burlington, Ontario L7L 5M4 Canada Phone: +1 (905) 632-2996 Fax: +1 (905) 632-2055 E-mail: nae_sales@gennum.com Phone: +82-2-414-2991 Fax: +82-2-414-2998 E-mail: gennum-korea@gennum.com 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. (c) Copyright 2005 Gennum Corporation. 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