GS1528_10

GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Features • • • • • • • SMPTE 292M, SMPTE 344M and SMPTE 259M compliant dual coaxial cable driving outputs with selectable slew rate 50Ω differential PECL input seamless interface to other HD-LINX® II family products Pb-free and RoHS Compliant single 3.3V power supply operation operating temperature range: 0°C to 70°C Description The GS1528 is a second generation high-speed bipolar integrated circuit designed to drive one or two 75Ω co-axial cables at data rates up to 1.485Gb/s. The GS1528 provides two selectable slew rates in order to achieve compliance to SMPTE 259M, SMPTE 344M and SMPTE 292M. The GS1528 accepts a LVPECL level differential input that may be AC-coupled. External biasing resistors at the inputs are not required. Power consumption is typically 160mW using a 3.3V power supply. This component and all homogeneous subcomponents are RoHS compliant. Applications • SMPTE 292M, SMPTE 344M and SMPTE 259M Coaxial Cable Serial Digital Interfaces. Bandgap Reference and Biasing Circuit RSET SDI SDI Input Differential Pair Output Stage & Control SDO SDO SD/HD Functional Block Diagram GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 www.gennum.com 1 of 13 Revision History Version 9 8 7 6 5 4 ECR 154748 152046 151340 139116 137163 136566 PCN – – – 38124 – – Date August 2010 June 2009 February 2009 January 2006 June 2005 April 2005 Changes and / or Modifications Corrected Figure 5-1: Package Dimensions. Removed ‘Proprietary & Confidential’ from footer. Updated document format. Added 2,500pc reel, and removed leaded parts in section 5.1 Ordering Information. Corrected Serial Input Swing to 2200mV Rephrased RoHS compliance statement. Updated ‘Green’ references to RoHS Compliant. Contents 1.1 Absolute Maximum Ratings ..........................................................................................................3 1.2 DC Electrical Characteristics ........................................................................................................3 1.3 AC Electrical Characteristics ........................................................................................................4 2.1 Pin Assignment ..................................................................................................................................5 2.2 Pin Descriptions ................................................................................................................................5 2.3 Input/Output Circuits .....................................................................................................................6 3.1 Input Interfacing ...............................................................................................................................7 3.2 SD/HD ..................................................................................................................................................7 3.3 Output Interfacing ...........................................................................................................................7 3.4 Output Return Loss Measurement ..............................................................................................9 3.5 Output Amplitude Adjustment ................................................................................................. 10 4.1 PCB Layout ....................................................................................................................................... 11 4.2 Typical Application Circuit ........................................................................................................ 11 5.1 Ordering Information ................................................................................................................... 12 GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 2 of 13 1. Electrical Characteristics 1.1 Absolute Maximum Ratings TA = 25°C unless otherwise indicated Parameter Supply Voltage Input ESD Voltage Storage Temperature Range Input Voltage Range (any input) Operating Temperature Range Power Dissipation Lead Temperature (soldering, 10 sec) Value -0.5V to 3.6 VDC 500V -50°C < Ts < 125°C -0.3 to (VCC +0.3)V 0°C to 70°C 300mW 260°C CAUTION The GS1528 is sensitive to electrostatic discharge. Use extreme caution, observing all ESD-prevention practices, during handling and assembly. The SDI inputs of the GS1528 must be protected from electrostatic discharge and electrical overstress during the handling and operation of circuit assemblies 1.2 DC Electrical Characteristics Table 1-1: DC Electrical Characteristics VDD = 3.3V, TA = 0°C to 70°C, unless otherwise shown Parameter Conditions Symbol Min Typ Max Units Notes Test Levels 3 5 1 6 5 7 7 Supply Voltage Power Consumption Supply Current Output Voltage Input Voltage SD/HD Input TA = 25°C TA = 25°C Common mode Common mode VCC PD Ιs VCMOUT VCMIN VIH VIL 3.135 – – – 1.6 + ΔVSDI/2 2.4 – 3.3 160 48 VCC - VOUT – – – 3.465 – – – VCC - ΔVSDI/2 – 0.8 V mW mA – V V V ±5% GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 3 of 13 1.3 AC Electrical Characteristics Table 1-2: AC Electrical Characteristics VDD = 3.3V, TA = 0°C to 70°C, unless otherwise shown Parameter Serial input data rate Additive jitter Conditions Symbol DRSDO Min – – – Typ – 15 25 – – – – – – 800 Max 1.485 – – 220 800 30 30 8 – 850 Units Gb/s psp-p psp-p ps ps ps ps % dB mVp-p Notes 2 Test Levels 1 1 1 1.485Gb/s 270Mb/s Rise/Fall time SD/HD=0 SD/HD=1 tr, tf tr, tf tr, tf – 400 – – – 20% to 80% 20% to 80% 1 1 1 1 1 Mismatch in rise/fall time Duty cycle distortion Overshoot Output Return Loss Output Voltage Swing Single Ended into 75Ω external load RSET = 750Ω Input Voltage Swing TEST LEVELS 1. 2. 3. 4. 5. 6. 7. 8. 9. Differential ORL VOUT 15 750 1 7 1 VSDI 300 – 2200 mVp-p 1 Production test at room temperature and nominal supply voltage with guardbands for supply and temperature ranges. Production test at room temperature and nominal supply voltage with guardbands for supply and temperature ranges using correlated test. Production test at room temperature and nominal supply voltage. QA sample test. Calculated result based on Level 1, 2, or 3. Not tested. Guaranteed by design simulations. Not tested. Based on characterization of nominal parts. Not tested. Based on existing design/characterization data of similar product. Indirect test. NOTES: 1. Tested on CB1528 board from 5MHz to 1.435GHz 2. The input coupling capacitor must be set accordingly for lower data rates. GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 4 of 13 2. Pin Out 2.1 Pin Assignment SDI SDI VEE RSET 1 2 3 4 8 7 6 5 SDO SDO SD/HD VCC GS1528 8-pin SOIC (top view) Figure 2-1: 8-Pin SOIC 2.2 Pin Descriptions Table 2-1: Pin Descriptions Pin Number 1,2 3 4 5 6 Name SDI, SDI VEE RSET VCC SD/HD Type PECL INPUT POWER INPUT POWER LOGIC INPUT Description Serial digital differential input. Most negative power supply connection. Connect to GND. External output amplitude control resistor. Most positive power supply connection. Connect to +3.3V. Output slew rate control. When HIGH, the output will meet SMPTE259M rise/fall time specifications. When LOW, the serial outputs will meet SMPTE292M rise/fall time specifications. Serial digital differential output. 7, 8 SDO, SDO OUTPUT GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 5 of 13 2.3 Input/Output Circuits VCC SDI SDI VCC 5k 10k 10k 10k Figure 2-2: Differential Input Stage (SDI/SDI) Vcc SDO SDO REF Figure 2-3: Differential Output Stage (SDO/SDO) ΙREF derived using RSET VCC SD/HD On Chip Reference Figure 2-4: Slew Rate Select Input Stage (SD/HD) GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 6 of 13 3. Detailed Description 3.1 Input Interfacing SDI/SDI are high-impedance differential inputs (see Figure 2-1 for equivalent input circuit). Several conditions must be observed when interfacing to these inputs: 1. The differential input signal amplitude must be between 300 and 2000mVpp. 2. The common mode voltage range must be as specified in Table 1-1: DC Electrical Characteristics. 3. For input trace lengths longer than approximately 1cm, the inputs should be terminated as shown in the Typical Application Circuit. The GS1528 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. 3.2 SD/HD The GS1528 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 to a HIGH INPUT. For SMPTE 292M standards and signals which require faster rise and fall times, this pin should be set to a LOW INPUT. 3.3 Output Interfacing The GS1528 outputs are current mode, and will drive 800mV into a 75Ω load. These outputs are protected from accidental static damage with internal static protection diodes. The SMPTE 292M, SMPTE 344M and SMPTE 259M standards requires that the output of a cable driver have a source impedance of 75Ω and a return loss of at least 15dB between 5MHz and 1.485GHz. In order for an SDI output circuit using the GS1528 to meet this specification, the output circuit shown in the Typical Application Circuit is recommended. The value of LCOMP will vary depending on the PCB layout, with a typical value of 5.6nH (see the Application Information on page 11 in this data sheet for further details). A 4.7μF capacitor is used for AC-coupling the output of the GS1528. This value is chosen to ensure that pathological signals can be coupled without a significant DC component occurring. GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 7 of 13 Tek Stopped: 8110 Acquisitions Figure 3-1: Output signal for 270Mb/s input Tek Running: Normal Figure 3-2: Output signal for 1.485Gb/s input When measuring return loss at the GS1528 output, it is necessary to take the measurement for both a logic high and a logic low output condition. This is because the output protection diodes act as varactors (voltage controlled capacitors) as shown in Figure 3-3. Consequently, the output capacitance of the GS1528 is dependent on the logic state of the output. GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 8 of 13 GS1528 SDO SDO Figure 3-3: Static Protection Diodes 3.4 Output Return Loss Measurement To perform a practical return loss measurement, it is necessary to force the GS1528 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 GS1528 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. GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 9 of 13 3.5 Output Amplitude Adjustment The output amplitude of the GS1528 can be adjusted by changing the value of the RSET resistor as shown in Figure 3-4 and Table 3-1. For an 800mVp-p output with a nominal ±7% tolerance, a value of 750Ω is required. A ±1% SMT resistor should be used. 1100 Output Swing (mV) 1000 900 800 700 600 500 600 700 800 900 1000 RSET R (W) Figure 3-4: Output Amplitude Adjustment The RSET resistor is part of the high-speed output circuit of the GS1528. 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 ground plane beneath the RSET resistor and the RSET pin. Table 3-1: RSET vs. VOD RSET Resistance (Ω) 995 824 750 600 573 Output Swing 608 734 800 884 1040 NOTE: For reliable operation of the GS1528 over the full temperature range, do not use an RSET value below 573Ω. GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 10 of 13 4. Application Information 4.1 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 GS1528 output components to minimize parasitic capacitance The PCB ground plane is removed under the GS1528 RSET pin and resistor to minimize parasitic capacitance Input and output BNC connectors are surface-mounted in-line to eliminate transmission line stubs caused by a BNC mounting via high-speed traces, which are curved to minimize impedance variations due to change of PCB trace width 4.2 Typical Application Circuit 5.6n 75 4u7 GS1528 49.9 10n DIFFERENTIAL DATA INPUT 49.9 1 2 3 SDI SDI VEE RSET VCC * BNC 4u7 VCC SDO SDO SD/HD 8 7 6 75 10n 75 75 5.6n* 4u7 BNC 4u7 VCC 4 5 * TYPICAL VALUE VARIES WITH LAYOUT VCC 750 10n SD/HD NOTE: All resistors in Ohms, capacitors in Farads, and inductors in Henrys, unless otherwise noted. Figure 4-1: GS1528 Typical Application Circuit GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 11 of 13 5. Package Dimensions SYMBOL D X 8 SOIC Min. 0.054 0.004 0.014 0.189 0.150 Max. 0.068 0.0098 0.019 A E 0.010 Gauge Plane A1 B D E H e C L X q1 q2 Pin 1 ID Mark q2 e B DETAIL “A” Seating Plane L 0.015 ±0.004 x 45° DETAIL “A” 0.196 0.157 0.244 0.229 0.050 BSC 0.0075 0.016 0.0098 0.034 0.0215 REF 0° 8° 7° BSC C A A1 q1 NOTES: 1. All dimensions in inches unless otherwise stated. 2. Lead coplanarity should be 0 to 0.004” max. 3. Package surface finishing: VDI 24~27 (dual). Package surface finishing: VDI 13~15 (16L SOIC[NB] matrix). 4. All dimensions exclude mold flashes. 5. The lead width (B) to be determined at 0.0075” from the lead tip. Figure 5-1: Package Dimensions 5.1 Ordering Information Part Number GS1528-CKAE3 GS1528-CTAE3 GS1528-CTAE3Z Package 8 pin SOIC 8 pin SOIC, tape & reel (250pc) 8 pin SOIC, tape & reel (2,500pc) Temperature 0°C to 70°C 0°C to 70°C 0°C to 70°C Pb-Free and RoHS Compliant Yes Yes Yes GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 12 of 13 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 2002 Gennum Corporation. All rights reserved. www.gennum.com GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver Data Sheet 16632 - 9 August 2010 13 of 13 13