GS1524 Multi-Rate SDI Adaptive Cable Equalizer Key Features Description • SMPTE 292M, SMPTE 344M and SMPTE 259M compliant • automatic cable equalization • multi-standard operation from 143Mb/s to 1.485Gb/s • supports DVB-ASI at 270Mb/s The GS1524 is a second-generation high-speed bipolar integrated circuit designed to equalize and restore signals received over 75Ω co-axial cable at data rates from 143Mb/s up to 1.485Gb/s. The GS1524 is designed to support SMPTE 292M, SMPTE 344M and SMPTE 259M, and is optimized for performance at 270Mb/s and 1.485Gb/s. • manual bypass (useful for low data rates with slow rise/fall times) • performance optimized for 270Mb/s and 1.485Gb/s • typical maximum equalized length of Belden 1694A cable: 140m at 1.485Gb/s, 350m at 270Mb/s • 50Ω differential output (with internal 50Ω pull-ups) • Pb-free and RoHS Compliant • cable length indicator for SMPTE 259M inputs • output mute based on max cable length adjust or manual override • single 3.3V power supply operation • operating temperature range: 0°C to +70°C The GS1524 features DC restoration to compensate for the DC content of SMPTE pathological test patterns. The GS1524 also incorporates a Cable Length Indicator (CLI) that provides an indication of the amount of cable being equalized for data rates up to 360Mb/s. A voltage programmable mute threshold (MCLADJ) is included to allow muting of the GS1524 output when an approximate selected cable length is reached for SMPTE 259M signals. This feature allows the GS1524 to distinguish between low amplitude SD-SDI signals and noise at the input of the device. The CD/MUTE pin provides an indication of the GS1524 mute status in addition to functioning as a mute control input. The SD outputs of the GS1524 may be forced to a mute state by applying a voltage to the CD/MUTE pin. Applications • SMPTE 292M, SMPTE 344M and SMPTE 259M Coaxial Cable Serial Digital Interfaces Power consumption is typically 265mW using a 3.3V power supply. This component and all homogeneous subcomponents are RoHS compliant. CABLE LENGTH INDICATOR/ADJUSTOR CARRIER DETECT MUTE MCLADJ CLI CD/MUTE BYPASS SDI SDI EQUALIZER DC RESTORE OUTPUT SDO SDO AGC Functional Block Diagram GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 www.gennum.com 1 of 16 Revision History Version ECR PCN Date Changes and / or Modifications 11 156822 – August 2011 Removed the test level notes from Table 2-1: DC Electrical Characteristics and Table 2-2: AC Electrical Characteristics. 10 151731 – April 2009 Reorganized figures in Input/Output Circuits and Typical Performance Curves. Clarified tape and reel information in Ordering Information. 9 151339 – March 2009 Updated document format. Added 2,500pc reel, and removed leaded parts to section 7.2 Ordering Information. 8 142111 40438 September 2006 Modified format for output cable length jitter data in AC Electrical Characteristics. 7 137165 – June 2005 Rephrased RoHS compliance statement. 6 136565 – April 2005 Updated ‘Green’ references to RoHS Compliant. Contents Key Features ........................................................................................................................................................1 Applications.........................................................................................................................................................1 Description...........................................................................................................................................................1 Revision History .................................................................................................................................................2 1. Pin Out...............................................................................................................................................................3 1.1 GS1524 Pin Assignment .................................................................................................................3 1.2 GS1524 Pin Descriptions ................................................................................................................3 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 ..................................................................................................................................8 4. Typical Performance Curves .....................................................................................................................9 5. Detailed Description.................................................................................................................................. 13 5.1 Serial Digital Inputs ...................................................................................................................... 13 5.2 Cable Equalization ........................................................................................................................ 13 5.3 Programmable Mute Output & Cable Length Indicator .................................................... 14 5.4 Mute and Carrier Detect .............................................................................................................. 14 6. Application Information .......................................................................................................................... 15 6.1 PCB Layout ....................................................................................................................................... 15 6.2 Typical Application Circuit ........................................................................................................ 15 7. Package & Order Information ................................................................................................................ 16 7.1 Package Dimensions ..................................................................................................................... 16 7.2 Ordering Information ................................................................................................................... 16 GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 2 of 16 1. Pin Out 1.1 GS1524 Pin Assignment CLI 1 16 CD/MUTE VCC 2 15 VCC 14 VEE 13 SDO 12 SDO VEE 3 SDI 4 SDI 5 VEE 6 11 V AGC+ 7 10 MCLADJ AGC- 8 9 BYPASS GS1524 16PIN SOIC TOP VIEW EE Figure 1-1: 16-pin SOIC 1.2 GS1524 Pin Descriptions Table 1-1: Pin Descriptions Pin Number Name Type Description 1 CLI ANALOG OUTPUT CABLE LENGTH INDICATOR. An analog voltage proportional to the cable length connected to the Serial digital input. Note: CLI is recommended for data rates up to 360Mb/s only. 4,5 SDI, SDI INPUT Serial digital differential input. 7,8 AGC+, AGC- PASSIVE INPUT External AGC capacitor. Should be set to IµF 9 BYPASS LOGIC INPUT Forces the Equalizing and DC RESTORE stages into bypass mode when HIGH. No equalization occurs in this mode. 10 MCLADJ ANALOG INPUT MAXIMUM CABLE LENGTH ADJUST. Adjusts the approximate maximum amount of cable to be equalized (from 0m to the maximum cable length). The output is muted (latched to the last state) when the maximum cable length is achieved. Note: MCLADJ is recommended for data rates up to 360Mb/s 12, 13 SDO, SDO PECL OUTPUT GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 Equalized serial digital differential output. 3 of 16 Table 1-1: Pin Descriptions (Continued) Pin Number Name Type Description 16 CD/MUTE BIDIRECTIONAL MUTE INDICATOR-CONTROL/CARRIER DETECT. OUTPUT: the output voltage drops to below 1.2V when the carrier is present and the data outputs are active. INPUT: if the CD/MUTE pin is tied to ground, the data output will never mute and the MCLADJ setting is overwritten. If the CD/MUTE pin is tied to VCC, the data outputs will always mute and the MCLADJ setting is overwritten. Note: CD/MUTE is not functional in BYPASS mode. 3, 6, 11, 14 VEE POWER Most negative power supply connection. Connect to ground. 2, 15 VCC POWER Most positive power supply connection. Connect to +3.3V. GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 4 of 16 2. Electrical Characteristics 2.1 Absolute Maximum Ratings Parameter Value Supply Voltage -0.5V to +3.6VDC Input ESD Voltage 500V 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 Power Dissipation 300mW Lead Temperature (soldering, 10 sec.) 260°C 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 Conditions Symbol Min Typ Max Units Notes Supply Voltage – VCC 3.135 3.3 3.465 V ± 5% Power Consumption TA=25°C PD – 265 – mW – Supply Current TA=25°C ΙS – 80 – mA – Output Common Mode Voltage TA=25°C VCMOUT – VCC - ΔVSDO/2 – V – Input Common Mode Voltage TA=25°C VCMIN – 1.75 – V – CLI DC Voltage (0m) TA=25°C – – 2.5 – V – CLI DC Voltage (no signal) TA=25°C – – 1.9 – V – Floating MCLADJ DC Voltage TA=25°C – – 1.3 – V – MCLADJ Range TA=25°C – – 0.69 – V – CD/Mute Output Voltage Carrier not present VCD/Mute(OH) 2.6 – – V – Carrier present VCD/Mute(OL) – – 1.2 CD/Mute Input Voltage Required to Force Outputs to Mute Min to Mute VCD/Mute 3.0 – – V – CD/Mute Input Voltage Required to Force Active Max to Activate VCD/Mute – – 2.0 V – GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 – 5 of 16 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 Conditions Symbol Min Typ Max Units Notes Serial input data rate – – 143 – 1485 Mb/s – Input Voltage Swing TA =25°C, differential ΔVSDI 720 800 950 mVp-p 0m cable length 50Ω load, TA =25°C, ΔVSDO – 750 – mVp-p – Output Voltage Swing differential 270Mb/s Belden 1694A: 0-350m Belden 8281: 0-280m – – 0.2 – UI 2,4 1.485Gb/s Belden 1694A: 0-140m Belden 8281: 0-100m – – 0.25 – UI 2,4 Output Rise/Fall time 20% - 80% – – 80 220 ps – Mismatch in rise/fall time – – – – 30 ps – Duty cycle distortion – – – – 30 ps – Overshoot – – – – 10 % – Input Return Loss – – 15 – – dB 1 Input Resistance single ended – – 1.64 – kΩ – Input Capacitance single ended – – 1 – pF – Output Resistance single ended – – 50 – Ω – Output Jitter for Various Cable Lengths and Data Rates NOTES: 1. Tested on CB1524 board from 5MHz to 2GHz. 2. All parts production tested. In order to guarantee jitter over the full range of specification (VCC = 3.3V ±5%, TA = 0°C to 70°C, and 720-880mV launch swing from the SDI cable driver) the recommended applications circuit must be used. 3. Based on characterization data using the recommended applications circuit, at VCC = 3.3V, TA = 25°C, and 800mV launch swing from the SDI cable driver. 4. Equalizer Pathological test signal is used. GigaBERT 1400 EXT. CLOCK CLOCK OUT DATA OUT 8281 or 1694A CABLE 50/75 IN GS1524 TEST BOARD EXT. CLOCK 1.485GHz/270MHz OUT CH. 1 OUT CH. 2 TDS 820 EXT. TRIGGER Figure 2-1: Test Circuit GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 6 of 16 3. Input/Output Circuits All resistors in ohms, all capacitors in farads, unless otherwise shown. VCC 10k 3k 3k SDI SDI 10k RC 3.6k 3.6k - CLI + Figure 3-1: Input Equivalent Circuit Figure 3-2: CLI Output Circuit VCC VCC 7.5k 12k OUTPUT STAGE + MCLADJ MUTE CONTROL - CD/MUTE 150µ Figure 3-3: MCLADJ Equivalent Circuit 50 Figure 3-4: CD/Mute Circuit 50 SDO SDO Figure 3-5: Output Circuit GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 Bypass Internal Reference Figure 3-6: Bypass Circuit 7 of 16 4. Typical Performance Curves (unless otherwise shown, VCC = 3.3V, TA = 25°C) POWER CONSUMPTION (mW) 350 300 250 200 150 100 50 0 0 20 40 60 80 150 200 TEMPERATURE (°C) Figure 4-1: Power Consumption 160 140 JITTER (ps) 120 100 80 60 40 20 0 0 50 100 CABLE LENGTH (m) Figure 4-2: Typical Peak to Peak Jitter, PRN 223-1, Belden 1694A, 1.485 Gb/s 1100 900 JITTER (ps) 700 500 400 300 200 100 0 0 100 200 300 400 CABLE LENGTH (m) GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 8 of 16 Figure 4-3: Typical Peak to Peak Jitter, PRN 223-1, Belden 1694A, 270Mb/s OUTPUT SIGNAL SWING (mV) 500 400 300 200 100 0 0 20 40 60 80 TEMPERATURE (°C) Figure 4-4: Output Signal Swing, p-p, Single Ended VOLTAGE (V) 3.5 3.0 2.5 2.0 0 50 100 150 200 250 300 CABLE LENGTH (m) Figure 4-5: MCLADJ Input Voltage vs. 1694A Cable Length, 270Mb/s CLI VOLTAGE (V) 3.5 3 2.5 2 1.5 0 50 100 150 200 250 300 CABLE LENGTH (m) Figure 4-6: CLI Voltage vs. Belden 8281 Cable Length, 270Mb/s GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 9 of 16 Tek Running: Normal Figure 4-7: Input 100m (Belden 8281), 1.485Gb/s Figure 4-8: Output 100m (Belden 8281), 1.485Gb/s GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 10 of 16 Figure 4-9: Input 280m (Belden 8281), 270Mb/s Figure 4-10: Output 280m (Belden 8281), 270Mb/s 0 -10 -20 -30 -40 -50 0.05 GHz 1 GHz 2 GHz Figure 4-11: Input Return Loss using CB1524 Board GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 11 of 16 5. Detailed Description The GS1524 is a high speed bipolar IC designed to equalize both HD and SD serial digital signals. The device can typically equalize greater than 140 meters of Belden 1694A cable at 1.485Gb/s and 350m at 270Mb/s. Powered from a single +3.3V or -3.3V power supply, the device consumes approximately 265mW of power. 5.1 Serial Digital Inputs The serial data signal may be connected to the input pins (SDI/SDI) in either a differential or single ended configuration. AC coupling of the inputs is recommended, as the SDI and SDI inputs are internally biased at approximately 1.8V. 5.2 Cable Equalization The input signal passes through a variable gain equalizing stage whose frequency response closely matches the inverse of the cable loss characteristic. In addition, the variation of the frequency response with control voltage imitates the variation of the inverse cable loss characteristic with cable length. The edge energy of the equalized signal is monitored by a detector circuit which produces an error signal corresponding to the difference between the desired edge energy and the actual edge energy. This error signal is integrated by both an internal and an external AGC filter capacitor providing a steady control voltage for the gain stage. As the frequency response of the gain stage is automatically varied by the application of negative feedback, the edge energy of the equalized signal is kept at a constant level which is representative of the original edge energy at the transmitter. The equalized signal is also DC restored, effectively restoring the logic threshold of the equalized signal to its correct level independent of shifts due to AC coupling. The digital output signals have a nominal voltage of 750mVpp differential, or 375mVpp single ended when terminated with 50Ω as shown in Figure 5-1. +187.5mV VCM = 2.925V typical SDO -187.5mV SDO +187.5mV 50 50 VCM = 2.925V typical -187.5mV Figure 5-1: Typical Output Voltage Levels GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 12 of 16 5.3 Programmable Mute Output & Cable Length Indicator For SMPTE 259M inputs, the GS1524 incorporates an analog cable length indicator (CLI) output and a programmable threshold output mute (MCLADJ). The voltage output of CLI pin is an approximation of the amount of cable present at the GS1524 input for data rates up to 360Mb/s. The CLI voltage versus cable length (signal strength) is shown in Figure 4-6. With 0m of cable, 800mV input signal levels and at 270Mb/s, the CLI output voltage is approximately 2.5V. As the cable length increases, the CLI voltage decreases providing an approximate correlation between the CLI voltage and cable length. In applications where there are multiple input channels using the GS1524, it is advantageous to have a programmable mute output to avoid signal crosstalk. The output of the GS1524 can be muted when the input signal decreases below a selectable input level. The voltage applied to the MCLADJ pin vs. input cable length is shown in Figure 4-5. For consistent accurate results this may need to be calibrated for each device. The MCLADJ pin may be left unconnected for applications where output muting is not required. This feature has been designed for use in applications such as routers where signal crosstalk and circuit noise cause the equalizer to output erroneous data when no input signal is present. The use of a Carrier Detect function with a fixed internal reference does not solve this problem since the signal to noise ratio on the circuit board could be significantly less than the default signal detection level set by the on chip reference. NOTE: MCLADJ and CLI are only recommended for data rates up to 360Mb/s. 5.4 Mute and Carrier Detect In addition, a multi-function CD/MUTE pin allows control of the GS1524 MUTE functionality for both SD and HD inputs. The CD/MUTE pin is a multi-function bidirectional pin that provides the following functions: Applying a HIGH INPUT to the CD/MUTE pin forces the GS1524 outputs to a muted condition. See the Table 2-1: DC Electrical Characteristics for voltage levels. In this condition the outputs will be latched to the last logic level present at the output to avoid signal crosstalk. Applying a LOW INPUT to the CD/MUTE pin will force the GS1524 outputs to remain active regardless of the length of input cable and the voltage applied to the MCLADJ pin. See the Table 2-1: DC Electrical Characteristics for voltage levels. When used as an OUTPUT, the CD/MUTE pin will provide an indication of the output mute status. The CD/MUTE voltage will fall to below 1.2V when the carrier is present and the data outputs are active. Note: The CD/MUTE pin is not functional in BYPASS mode. GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 13 of 16 6. Application Information 6.1 PCB Layout Special attention must be paid to component layout when designing serial digital interfaces for HDTV. A 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: PCB trace width for HD rate signals is closely matched to SMT component width to minimize reflections due to change in trace impedance. The PCB ground plane is removed under the GS1524 input components to minimize parasitic capacitance. The PCB ground plane is removed under the GS1524 output components to minimize parasitic capacitance. High-speed traces are curved to minimize impedance changes. 6.2 Typical Application Circuit CLI CD/MUTE VCC VCC 10n BNC GS1524 6.4n 1 2 3 1u 4 5 6 7 75 1u 8 75 + 37.4 CLI VCC VEE SDI SDI VEE AGC+ AGC- 10n CD/MUTE VCC VEE SDO SDO VEE MCLADJ BYPASS 16 15 14 13 12 11 10 9 + 4u7 SDO + SDO 4u7 1u MCLADJ NOTE: All resistors in Ohms, capacitors in Farads, and inductors in Henrys, unless otherwise noted. BYPASS Figure 6-1: GS1524 Typical Application Circuit GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 14 of 16 7. Package & Order Information 7.1 Package Dimensions * CONTROLLING DIMENSION: MM MILLIMETER INCH Symbol MIN. NOM. MAX. MIN. NOM. MAX. A 1.35 1.63 1.75 0.053 0.064 0.069 A1 0.10 0.15 0.25 0.004 0.006 0.010 A2 1.30 1.40 1.50 0.051 0.055 0.059 0.33 0.41 0.51 0.013 0.016 0.020 b c 0.25 0.19 D 9.80 9.91 E 3.80 3.90 e 0.010 0.007 10.01 0.386 0.390 0.394 4.00 0.150 0.154 0.157 1.27 0.50 H 5.80 6.00 6.20 0.228 0.236 0.244 L 0.40 0.64 1.27 0.016 0.025 0.050 L1 0.042 1.07 0.10 Y 0° 8° 0.004 0° 8° Figure 7-1: 16-pin SOIC 7.2 Ordering Information Part Number Package Temperature Pb-Free and RoHS Compliant GS1524-CKDE3 16 pin SOIC 0°C to 70°C Yes GS1524-CTDE3 16 pin SOIC Tape (250pcs) 0°C to 70°C Yes GS1524-CTDE3Z 16 pin SOIC Tape (2,500pcs) 0°C to 70°C Yes GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 15 of 16 DOCUMENT IDENTIFICATION CAUTION DATA SHEET ELECTROSTATIC SENSITIVE DEVICES The product is in production. 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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 2001 Gennum Corporation. All rights reserved. www.gennum.com GS1524 Multi-Rate SDI Adaptive Cable Equalizer Data Sheet 14976 - 11 August 2011 16 of 16 16