GS9068_10

GS9068 SD SDI Cable Driver Key Features • • • • • • • • SMPTE 259M and SMPTE 344M compliant Dual coaxial cable driving outputs 50Ω differential PECL input Single 3.3V power supply operation Space-saving 8-lead SOIC Operating temperature range: 0°C to 70°C Pin compatible with GS1528 HD-LINX® II multirate SDI dual slew-rate cable driver Pb-free and Green Description The GS9068 is a second generation high-speed bipolar integrated circuit designed to drive one or two 75Ω co-axial cables at data rates up to 540Mb/s. The GS9068 accepts a LVPECL level differential input, which may be AC-coupled. External biasing resistors at the inputs are not required. Power consumption is typically 160mW using a +3.3V DC power supply. Applications • SMPTE 259M Coaxial Cable Serial Digital Interfaces Bandgap Reference & Biasing Circuit RSET SDI SDI Input Differential Pair Output Stage & Control SDO SDO GS9068 Functional Block Diagram GS9068 SD SDI Cable Driver Data Sheet 22213 - 4 August 2010 www.gennum.com 1 of 11 Contents 1. Pin Out...............................................................................................................................................................3 1.1 Pin Assignment ..................................................................................................................................3 1.2 Pin Descriptions ................................................................................................................................3 2. Electrical Characteristics ............................................................................................................................4 2.1 Absolute Maximum Ratings ..........................................................................................................4 2.2 DC Electrical Characteristics ........................................................................................................4 2.3 AC Electrical Characteristics ........................................................................................................5 3. Detailed Description.....................................................................................................................................6 3.1 Serial Digital Input ...........................................................................................................................6 3.2 Serial Digital Output ........................................................................................................................6 3.3 Output Return Loss Measurement ..............................................................................................7 3.4 Output Amplitude Adjustment ....................................................................................................7 4. Application Reference Design ..................................................................................................................9 4.1 PCB Layout ..........................................................................................................................................9 4.2 Typical Application Circuit ...........................................................................................................9 5. References........................................................................................................................................................9 6. Package and Ordering Information...................................................................................................... 10 6.1 Package Dimensions ..................................................................................................................... 10 6.2 Ordering Information ................................................................................................................... 10 7. Revision History.......................................................................................................................................... 10 GS9068 SD SDI Cable Driver Data Sheet 22213 - 4 August 2010 2 of 11 1. Pin Out 1.1 Pin Assignment SDI SDI VEE RSET 1 2 3 4 8 7 6 5 SDO SDO NC VCC GS9068 8-pin SOIC (top view) Figure 1-1: Pin Assignment 1.2 Pin Descriptions Pin Number 1, 2 3 4 5 6 7, 8 Name SDI, SDI VEE RSET VCC NC SDO, SDO Type Input Input Power Input Input Power — Output Serial digital differential input. Description Most negative power supply connection - connect to GND. External output amplitude control resistor. Most positive power supply connection - connect to +3.3V. No Connect. Serial digital differential output. GS9068 SD SDI Cable Driver Data Sheet 22213 - 4 August 2010 3 of 11 2. Electrical Characteristics 2.1 Absolute Maximum Ratings Table 2-1: Absolute Maximum Ratings 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 2.2 DC Electrical Characteristics Table 2-2: DC Electrical Characteristics Parameter Supply Voltage Power Consumption Supply Current Output Voltage Input Voltage Symbol VCC PD Is VOC VIC Conditions Min 3.1 - Typical 3.3 160 48 VCC - ΔVSDO(SE) - Max 3.5 VCC - ΔVSDI(DIFF)/2 Units V mW mA mV mV Test Level 3 5 1 6 1 Common mode Common mode 1.6 + ΔVSDI(DIFF)/2 GS9068 SD SDI Cable Driver Data Sheet 22213 - 4 August 2010 4 of 11 2.3 AC Electrical Characteristics Table 2-3: AC Electrical Characteristics Parameter Serial input data rate Input Voltage Swing Output Voltage Swing Symbol DRSDI ΔVSDI(DIFF) ΔVSDO(SE) Conditions — Differential single-ended into a 75Ω external load RSET = 750Ω — 20% to 80% — — — — Min — 300 750 Typical — — 800 Max 540 2200 850 Units Mb/s mVp-p mVp-p Test Level 1 1 1 Additive jitter Rise/Fall time Mismatch in rise/fall time Duty cycle distortion Overshoot Output Return Loss TEST LEVELS — tr/tf Δtr/Δtf — — ORL — 400 — — — 15 — — — — — — 30 800 30 100 8 — ps ps ps ps % dB 1 1 1 1 1 7 1. Production test at room temperature and nominal supply voltage with guard bands for supply and temperature ranges. 2. Production test at room temperature and nominal supply voltage with guard bands for supply and temperature ranges using correlated test. 3. Production test at room temperature and nominal supply voltage. 4. QA sample test. 5. Calculated result based on Level 1, 2, or 3. 6. Not tested. Guaranteed by design simulations. 7. Not tested. Based on characterization of nominal parts. 8. Not tested. Based on existing design/characterization data of similar product. 9. Indirect test. 10.Wafer Probe. GS9068 SD SDI Cable Driver Data Sheet 22213 - 4 August 2010 5 of 11 3. Detailed Description 3.1 Serial Digital Input SDI/SDI are high-impedance differential inputs. Several conditions must be observed when interfacing to these inputs: 1. The differential input signal amplitude must be between 300 and 2000mVpp. 2. For DC-coupling to the device, the common mode voltage must be between 1.6+ΔVSDI(DIFF) and VCC-ΔVSDI(DIFF). 3. For input trace lengths longer than approximately 1cm, the inputs should be terminated as shown in the Typical Application Circuit. The GS9068 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 Serial Digital Output The GS9068 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 259M standard 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 540MHz. In order for an SDI output circuit using the GS9068 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. A 4.7μF capacitor is used for AC-coupling the output of the GS9068. This value is chosen to ensure that pathological signals can be coupled without a significant DC component occurring (see Section 4. Application Reference Design, for more details). When measuring return loss at the GS9068 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 a varactor (voltage controlled capacitor) as shown in Figure 3-1. Consequently, the output capacitance of the GS9068 is dependent on the logic state of the output. SDO SDO Figure 3-1: Static Protection Diodes GS9068 SD SDI Cable Driver Data Sheet 22213 - 4 August 2010 6 of 11 3.3 Output Return Loss Measurement To perform a practical return loss measurement, it is necessary to force the GS9068 output to a DC high or low condition. The actual return loss will be based on the outputs being static at VCC or VCC-1.6V. Under normal operating conditions, the outputs of the GS9068 swing between VCC-0.4V and VCC-1.2V, hence 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 method, 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; the interpolated values are RIH = -17dB and RIL = -15dB. 3.4 Output Amplitude Adjustment The output amplitude of the GS9068 can be adjusted by changing the value of the RSET resistor as shown in Figure 3-2 and Table 3-1 below. 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 (W) Figure 3-2: Output Amplitude Adjustment The RSET resistor is part of the high-speed output circuit of the GS9068. 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. GS9068 SD SDI Cable Driver Data Sheet 22213 - 4 August 2010 7 of 11 Table 3-1: RSET vs. VOD RSET (Ω) 995 824 750 600 573 Output Swing 608mV 734mV 800mV 884mV 1040mV NOTE: For reliable operation of the GS9068 over the full temperature range, do not use an RSET value below 573Ω. GS9068 SD SDI Cable Driver Data Sheet 22213 - 4 August 2010 8 of 11 4. Application Reference Design 4.1 PCB Layout 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 groundplane is removed under the GS9068 output components to minimize parasitic capacitance The PCB ground plane is removed under the GS9068 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 4.2 Typical Application Circuit 5.6n* BNC 4µ7 49.9 10n Differential Data Input 49.9 1 2 3 4 SDI SDI VEE RSET GS9068 SDO SDO NC VCC 8 7 6 5 75 75 VCC 10n 75 75 BNC 5.6n* 4µ7 VCC 750 10n 4µ7 VCC 4µ7 *typical value, varies with layout NOTE: All resistors in Ohms, capacitors in Farads, and inductors in Henrys, unless otherwise noted. Figure 4-1: Typical Application Circuit 5. References Compliant with SMPTE 259M and SMPTE 344M. GS9068 SD SDI Cable Driver Data Sheet 22213 - 4 August 2010 9 of 11 6. Package and Ordering Information 6.1 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 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 0.015 ±0.004 x 45° 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 6-1: Package Dimensions 6.2 Ordering Information Part Number GS9068-CKAE3 GS9068-CTAE3 Package 8 pin SOIC 8 pin SOIC Tape Temperature Range 0°C to 70°C 0°C to 70°C Pb-free and Green Yes Yes 7. Revision History Version A B 0 1 2 3 4 ECR 120608 125775 127024 128544 133977 139114 154753 PCN – – – – – 38124 – Date July 2002 July 2002 December 2002 March 2003 June 2004 January 2006 August 2010 Changes And/or Modifications New document. Added detailed block descriptions and initial applications information. Document upgraded to Preliminary Data Sheet and AC/DC Characteristics edited to match current design specification limits. Document upgraded to Data Sheet. Added lead-free and green information. Corrected Input Differential Swing to 2200mV. Corrected Package Dimensions and Ordering Information. GS9068 SD SDI Cable Driver Data Sheet 22213 - 4 August 2010 10 of 11 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 GS9068 SD SDI Cable Driver Data Sheet 22213 - 4 August 2010 11 of 11 11