GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Features Description • SMPTE 424M, SMPTE 292M and SMPTE 259M compliant The GS2988 is a high-speed BiCMOS integrated circuit designed to drive one to two 75Ω coaxial cables. • Supports DVB-ASI at 270Mb/s • Supports data rates from 270Mb/s to 2.97Gb/s • Wide common-mode range input buffer The GS2988 may drive data rates up to 2.97Gb/s and provides two selectable slew rates in order to achieve compliance to SMPTE 424M, SMPTE 292M and SMPTE 259M. 100mV sensitivity The GS2988 accepts industry-standard differential input levels including LVPECL and CML. supports DC-coupling to industry-standard differential logic • Input signal trace equalization Input trace equalization compensates for up to 10 inches of FR4 trace loss while in HD and 3G modes. This feature can be disabled using the EQ_EN pin. • Differential coaxial-cable-driving output The DISABLE pin powers-down the entire device. selectable slew rates The GS2988 features adjustable output swing using an external bias resistor. The single-ended output swing is adjustable from 500mVpp to 1800mVpp. on-chip 100Ω differential data input termination adjustable output swing from 500mVpp to 1800mVpp An output signal presence function, the OSP pin, indicates whether an active signal is present at the output of the GS2988. DISABLE control • Robust output signal presence function • Excellent output eye quality • Power supply operation at 3.3V or 2.5V • 110mW power consumption (2.5V supply) • Operating temperature range: -40°C to +85°C • Small footprint QFN package (4mm x 4mm) The GS2988 can be powered from either a 3.3V or a 2.5V supply. Power consumption is typically 110mW using a 2.5V power supply. The GS2988 is Pb-free, and the encapsulation compound does not contain halogenated flame retardant. This component and all homogeneous subcomponents are RoHS compliant. Drop-in compatible to the GS2978 • Pb-free and RoHS compliant Applications • SMPTE 424M, SMPTE 292M and SMPTE 259M coaxial cable serial digital interfaces GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 www.gennum.com 1 of 17 EQ_EN SD/HD DISABLE DDI DDI SDO Slew Rate Control Equalizer SDO Output Signal Presence Band Gap Reference & Output Control OSP RSET Functional Block Diagram Revision History Version ECR PCN Date 4 155552 – December 2010 Corrected the Marking Diagram. 3 155359 – November 2010 Clarified the functionality of the EQ_EN pin in Table 1-1: Pin Descriptions and throughout the document. 2 155070 – October 2010 Updated Typical Application Circuit. 1 153602 – February 2010 Converted document to Data Sheet. 0 153455 – January 2010 Converted document to Preliminary Data Sheet. Changed Additive jitter numbers in Table 2-2: AC Electrical Characteristics. B 152690 – October 2009 Updates to Section 2. Electrical Characteristics. Corrections to Section 3. Input/Output Circuits. A 151623 – April 2009 GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 Changes and/or Modifications New document. 2 of 17 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 ........................................................................................................6 2.3 AC Electrical Characteristics ........................................................................................................7 3. Input/Output Circuits ..................................................................................................................................8 4. Detailed Description.....................................................................................................................................9 4.1 Serial Data Input ...............................................................................................................................9 4.2 Input Trace-equalization ................................................................................................................9 4.3 Serial Data Output ............................................................................................................................9 4.3.1 Slew Rate Selection (Rise/Fall Time Requirement)....................................................9 4.4 Output Disable ................................................................................................................................ 10 4.5 Output Signal Presence Indicator (OSP) ................................................................................. 10 4.6 Output Amplitude (RSET) ........................................................................................................... 10 4.7 Output Return Loss Measurement ........................................................................................... 12 5. Application Information .......................................................................................................................... 13 5.1 PCB Layout ....................................................................................................................................... 13 5.2 Typical Application Circuit ........................................................................................................ 13 6. Package & Ordering Information .......................................................................................................... 14 6.1 Package Dimensions ..................................................................................................................... 14 6.2 Recommended PCB Footprint ................................................................................................... 15 6.3 Packaging Data ............................................................................................................................... 15 6.4 Solder Reflow Profiles .................................................................................................................. 16 6.5 Marking Diagram ........................................................................................................................... 16 6.6 Ordering Information ................................................................................................................... 17 GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 3 of 17 1. Pin Out VEE 3 RSET 4 Ground Pad (bottom of package) N/C OSP N/C 13 GS2988 16-pin QFN (top view) 12 SDO 11 SDO 10 SD/HD 9 5 6 7 8 N/C 2 14 N/C DDI 15 DISABLE 1 16 N/C DDI EQ_EN 1.1 Pin Assignment VCC Figure 1-1: 16-Pin QFN 1.2 Pin Descriptions Table 1-1: Pin Descriptions Pin Number Name Type 1, 2 DDI, DDI Input 3 VEE Power Description Serial data differential input. Most negative power supply connection for the input buffer and core. Connect to GND. 4 RSET Input 5, 7, 8, 13, 15 N/C − External output amplitude control resistor connection. No Connect. These pins are not connected internally. 6 DISABLE Input Control signal input. When set LOW, the entire device is powered-down. When set HIGH, the SDO/SDO pins will output a serial data signal. NOTE: if this pin is left floating, the serial data output will be enabled. 9 VCC Power Most positive power supply connection. Connect to 3.3V or 2.5V. GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 4 of 17 Table 1-1: Pin Descriptions Pin Number Name 10 SD/HD Type Input Description Control signal input. When set HIGH, the serial data output will meet the SMPTE 259M rise/fall time specification. When set LOW, the serial output will meet the SMPTE 292M and SMPTE 424M rise/fall time specification. NOTE: if this pin is left floating, the serial data output will meet the SMPTE 259M rise/fall time specification. 11, 12 SDO/ SDO Output Serial data differential output. 14 OSP Output Output signal presence status signal output. Signal levels are LVCMOS/LVTTL compatible. Indicates presence of a valid output signal. When the OSP pin is LOW, a good input signal has been detected within the output stage pre-driver. When this pin is HIGH, the output signal is invalid at the output of the pre-driver. 16 EQ_EN Input Control signal input. When set LOW, trace-equalization is turned ON. When set HIGH, trace-equalization is turned OFF. NOTE 1: if this pin is left floating, trace-equalization is turned OFF. NOTE 2: this pin must be pulled HIGH or left floating for operation in SD mode. – Center Pad Power Connect to most negative power supply plane following the recommendations in Recommended PCB Footprint on page 15. 2. Electrical Characteristics 2.1 Absolute Maximum Ratings Parameter Value Supply Voltage -0.5V to 3.6 VDC Input ESD Voltage 2.5kV Storage Temperature Range -50°C < Ts < 125°C Input Voltage Range (any input) -0.3 to (VCC +0.3)V Operating Temperature Range -40°C to +85°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. GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 5 of 17 2.2 DC Electrical Characteristics Table 2-1: DC Electrical Characteristics VCC = 3.3V ±5% or 2.5V ±5%; TA = -40°C to +85°C, unless otherwise shown Parameter Supply Voltage Power Consumption (2.5V) Symbol Conditions Min Typ Max Units Notes VCC 3.3V Typical 3.135 3.3 3.465 V – 2.5V Typical 2.375 2.5 2.625 V – SDO/SDO enabled – 110 130 mW 1 SDO/SDO disabled – 3 5 mW 1 SDO/SDO enabled – 155 183 mW 1 SDO/SDO disabled – 4 6 mW 1 VCC = 3.3V – 47 53 mA 1 VCC = 2.5V – 44 50 mA 1 Power-down – 1 1.8 mA 1 VCMOUT Common mode – VTERM - VOUT – V – VCMIN Common mode 1.4 + ΔVDDI/2 – VCC - ΔVDDI/2 V – PD Power Consumption (3.3V) Supply Current Output Voltage Input Voltage SD/HD, DISABLE, EQ_EN Input OSP Drive Strength IS VIH IIH <= 150μA 1.7 – – V – VIL IIL <= 150μA – – 0.8 V – – 2 – – mA – – NOTES: 1. Power consumed in GS2988 only. Termination resistors draw extra current. GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 6 of 17 2.3 AC Electrical Characteristics Table 2-2: AC Electrical Characteristics VCC = 3.3V ±5% or 2.5V ±5%; TA = -40°C to +85°C, unless otherwise shown Parameter Serial input data rate Additive jitter Rise/Fall time Mismatch in rise/fall time Duty cycle distortion Overshoot Output Return Loss Output Voltage Swing Input Voltage Swing Symbol DRSDO Conditions – Min Typ Max Units Notes .27 – 2.97 Gb/s 1 – 2.97Gb/s – 10 – psp-p 2 – 1.485Gb/s – 10 – psp-p 2 – 270Mb/s – 30 – psp-p 2 tr, tf SD/HD=0 – – 135 ps 3 tr, tf SD/HD=1 400 – 800 ps 3 Utr, Utf HD/3G modes only – – 35 ps – – SD/HD=0, 2.97Gb/s – – 14 ps 4, 5 – SD/HD=0, 1.485Gb/s – – 20 ps 4, 5 – SD/HD=1 – – 50 ps 4, 5 – SD/HD=0, – – 10 % 4 5 MHz – 1.485GHz 17 19 – dB 6 1.485GHz – 2.97GHz 13 15 – dB 6 VOUT RSET = 750Ω 750 800 850 mVp-p 4 UVDDI Guaranteed 100 – 250 mVp-pd – 2200 mVp-pd – ORL functional. Guaranteed to meet all 250 published specifications. Output Enable Delay – – – – 100 ns – Output Disable Delay – – – – 80 ns – NOTES: 1. 2. 3. 4. 5. 6. The input coupling capacitor must be set accordingly for lower data rates. Turning on input trace equalization will reduce jitter in most applications. Rise/Fall time measured between 20% and 80%. Single-ended into 75Ω external load. Calculated as the actual positive bit-width compared to the expected positive bit-width using a 1010 pattern. ORL depends on board design. The GS2988 achieves this specification on Gennum's evaluation boards. GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 7 of 17 3. Input/Output Circuits VCC VCC DDI DDI EQ RC* SDO SDO Vcc VCC IREF 5k 50 50 10k 700p *RC Network for Trace Equalization Figure 3-2: Differential Output Stage (SDO/SDO) Figure 3-1: Differential Input Stage (DDI/DDI) VCC Pull-up 80μA typical (50-150μA) IN VREF Figure 3-3: Control Input (DISABLE, SD/HD, EQ_EN) GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 8 of 17 4. Detailed Description 4.1 Serial Data Input The GS2988 features a differential input buffer with on-chip 100Ω differential termination. The serial data input signal is connected to the DDI and DDI input pins of the device. Input signals can be single-ended or differential, DC or AC-coupled. The serial data input buffer is capable of operation with any binary coded signal that meets the input signal level requirements, in the range of 270Mb/s to at least 2.97Gb/s. The input circuit is self-biasing to allow for simple AC or DC-coupling of input signals to the device. 4.2 Input Trace-equalization The GS2988 features fixed trace-equalization to compensate for PCB trace dielectric losses. NOTE: This feature is not available in SD mode, and therefore trace-equalization must be disabled when operating in this mode. The trace-equalization has two settings, OFF and ON. ON invokes a typical 3dB gain value at 1.5GHz. This value is optimized for compensating the high-frequency losses associated with approximately 10 inches of 5-mil stripline in FR4 material. Table 4-1: Input Trace-Equalization EQ_EN Function 0 Typical 3dB Trace Equalization 1 Trace Equalization OFF Floating Trace Equalization OFF 4.3 Serial Data Output The GS2988 features a current-mode differential output driver capable of driving up to 1800mVpp single-ended into a 1m length of 75Ω cable terminated at both ends. The output signal amplitude or swing is user configurable using an external RSET resistor. The SDO/SDO pin of the device provide the serial data outputs. 4.3.1 Slew Rate Selection (Rise/Fall Time Requirement) The GS2988 supports two user-selectable output slew rates. Control of the slew rate is determined by the setting of the SD/HD input pin. GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 9 of 17 Table 4-2: Slew Rate Selection SD/HD Rise/Fall Time 0 SMPTE 424M & 292M compliant 1 SMPTE 259M compliant Floating SMPTE 259M compliant 4.4 Output Disable The GS2988 supports an output disable function for the serial data differential output. Control of this function is determined by the setting of the DISABLE control pin. The serial output disable (DISABLE), disables power to the entire device. When asserted LOW, the SDO/SDO output driver is powered-down. Table 4-3: Output Disable DISABLE SDO/SDO 0 All Chip Power Down 1 Operational Floating Operational 4.5 Output Signal Presence Indicator (OSP) The GS2988 supports an output signal presence indicator function. The output signal presence pin (OSP) is an active-low output that indicates when a valid output signal has been detected at the pre-driver output. The output signal presence function measures signal-edge energy to indicate that the pre-driver to the serial data outputs is toggling. Table 4-4: Output Signal Presence Indicator Pre-Driver Output OSP Pin Valid signal present 0 No valid signal present 1 4.6 Output Amplitude (RSET) The output amplitude of the GS2988 can be adjusted by changing the value of the RSET resistor as shown in Figure 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. GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 10 of 17 The RSET resistor is part of an internal DC feedback loop in the GS2988. The resistor should be placed as close as possible to the RSET pin, and connected directly to the VCC plane (traces/wires may cause instability). 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: Care should be taken when considering layout of the RSET resistor. Please refer to Section 5.1 for more details. 2.0 1.75 1.5 VOUT (V) 1.25 1.0 0.75 0.5 0.25 0.250 0.500 0.750 1.0 1.25 1.5 RSET (kΩ) Figure 4-1: VOUT vs. RSET In order to determine the best starting value for Rset, the following formula should be used: Rset = 8*(Rtrm/VoutppSE) Where VoutppSE is in Volts, and both resistances are in Ω. Rtrm is the value of the termination resistors, which should be equal to the characteristic impedance of the cable, and is typically 75Ω. The cable must be short (≤1m), and terminated at both ends for the formula to be valid. Example: For a 75Ω cable, Rtrm = 75Ω (at both ends), VoutppSE = 800mV Rset = 8*(75/0.8) = 750Ω GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 11 of 17 This formula is not valid for long, unterminated, or improperly terminated cables. This formula should be considered as a starting point, and actual swing values may vary based on layout. Also, for large output swings (>1040mV), smaller Rset values may be required in order to achieve the desired output swing level at HD and 3G data rates. Table 4-5: Typical RSET Values Output Swing (mV) RSET (Ω) 1800* 332 800 750 500 1210 *NOTE: In order to generate output swings greater than 1040mV, VCC_TERM must be connected to a 5V supply. 4.7 Output Return Loss Measurement The GS2988 has a feature which allows users to measure ORL reliably while the device is still powered. The device can be put into a BALANCE mode which prevents the outputs from toggling while the device is powered on, allowing the ORL to be measured while the device is still powered. When EQ_EN is LOW while SD/HD is HIGH, the device goes into BALANCE mode. This mode is used during ORL measurement, disabling the AC signal path of the device without powering it down. When in BALANCE mode, the device produces equal pull-down currents in both differential shoulders of the serial data differential output, effectively stopping the output at the output common mode voltage level. Gennum recommends using BALANCE mode when measuring ORL with 2.5V termination voltage. GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 12 of 17 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 GS2988 output components to minimize parasitic capacitance (NOTE: care should be taken, as removing too much of the plane will make the system susceptible to EMI) • The PCB ground plane is removed under the GS2988 RSET pin and resistor to minimize parasitic capacitance. The RSET resistor should be directly connected to the VCC plane • 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 • High-speed traces are curved to minimize impedance variations due to change of PCB trace width NOTE: For more recommendations on Trace Lengths, ORL Inductor Values and other PCB Layout Considerations, please refer to Gennum’s GS2989 Design Guide (Doc ID 52070). 5.2 Typical Application Circuit VCC **Please refer to section 4.2. 10n 10n VCC 1 2 DDI GS2988 14 *Customer to choose resistor value. NOTE: All resistors in Ohms, capacitors in Farads, and inductors in Henrys, unless otherwise stated. GND 5n6* 4u7 75R 75R SDO 11 75R RSET OSP 4 R* 10n SDO 12 DDI VCC 4u7 VCC_Term 75R VEE 4u7 16 10 6 **EQ_EN SD/HD DISABLE 9 GND VCC_Term 10n 5n6* 4u7 GND 3 GND * Typical value: varies with layout, and represents a trade-off between good eye shape and output return loss. 5n6 is the optimum value for an 800mV output swing. 6n8 is the optimum value for an 1800mV output swing. Figure 5-1: Typical Application Circuit GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 13 of 17 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 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 GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 0.65 DETAIL B SCALE:NTS 14 of 17 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 / dimensions / pad pitch 16-pin QFN / 4mm x 4mm / 0.65mm 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, Halogen-free Yes GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 15 of 17 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. 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) 6.5 Marking Diagram Pin 1 Indicator GS2988 XXXXE3 YYWW Instructions: GS2988 XXXX E3 YYWW Package Mark Last 4 digits (excluding decimal) of SAP Batch Assembly (FIN) as listed on Packing Slip Pb-free & Green indicator Date Code GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 16 of 17 6.6 Ordering Information Part Number Package Temperature Range GS2988 GS2988-INE3 16-pin QFN -40°C to 85°C GS2988 GS2988-INTE3 16-pin QFN 250pc Reel -40°C to 85°C GS2988 GS2988-INTE3Z 16-pin QFN 2,500pc Reel -40°C to 85°C 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 Gennum Canada Limited Niederlassung Deutschland München, Germany Phone: +1 (613) 270-0458 Phone: +1 (416) 925-5643 Phone: +49 89 309040 290 Fax: +1 (613) 270-0429 Fax: +1 (416) 925-0581 Fax: +49 89 309040 293 CALGARY E-mail: [email protected] E-mail: [email protected] Suite 320, 3553 31st St. N.W. 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Phone: +1 (403) 284-2672 Fax: +91 (674) 259-5733 Phone: +1 (408) 934-1301 4281 Harvester Road Burlington, Ontario L7L 5M4 Canada Web Site: http://www.gennum.co.jp TAIWAN Phone: (886) 2-8732-8879 Fax: (886) 2-8732-8870 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 2009 Gennum Corporation. All rights reserved. www.gennum.com GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability Data Sheet 52131 - 4 December 2010 17 of 17 17