GS1574A HD-LINX® II Adaptive Cable Equalizer Features Description • SMPTE 292M and SMPTE 259M compliant • Automatic cable equalization • Multi-standard operation from 143Mb/s to 1.485Gb/s The GS1574A is a second-generation high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75Ω co-axial cable. • Supports DVB-ASI at 270Mb/s • Small footprint (4mm x 4mm) • Pb-free and RoHS compliant • Manual bypass (useful for low data rates with slow rise/fall times) • Performance optimized for 270Mb/s and 1.485Gb/s • Typical equalized length of Belden 1694A cable: 200m at 1.485Gb/s, 350m at 270Mb/s • 50Ω differential output (with internal 50Ω pull-ups) • Manual output mute or programmable mute based on max cable length adjust • Single 3.3V power supply operation • Operating temperature range: 0°C to +70°C The GS1574A is designed to support SMPTE 292M and SMPTE 259M, and is optimized for performance at 270Mb/s and 1.485Gb/s. Application • SMPTE 292M and SMPTE 259M Coaxial Cable Serial Digital Interfaces The GS1574A features DC restoration to compensate for the DC content of SMPTE pathological test patterns. A voltage programmable mute threshold (MCLADJ) is included to allow muting of the GS1574A output when an approximate selected cable length is reached for SMPTE 259M signals. This feature allows the GS1574A to distinguish between low amplitude SD-SDI signals and noise at the input of the device. The serial digital outputs of the GS1574A may be forced to a mute state by applying a voltage to the MUTE pin. Power consumption is typically 215mW using a 3.3V power supply. The GS1574A is lead-free, and the encapsulation compound does not contain halogenated flame retardant. This component and all homogeneous subcomponents are RoHS compliant. CABLE LENGTH ADJUSTOR CARRIER DETECT MUTE MCLADJ CD MUTE BYPASS SDI SDI EQUALIZER DC RESTORE OUTPUT SDO SDO AGC Figure A: GS1574A Functional Block Diagram GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 www.gennum.com 1 of 16 Revision History Version ECR PCN Date 10 156775 – August 2011 9 153754 – September 2009 8 144435 – March 2007 Added maximum power consumption to DC Electrical Characteristics. 7 141758 40438 August 2006 Modified 200m cable length in front page Features section and Detailed Description. 6 141576 40438 August 2006 Added 200m output cable length jitter data at 1.485Gb/s in AC Electrical Characteristics. 5 139634 38695 March 2006 Corrected pad standoff height and tolerances for pad width & package dimension. Corrected pad shape. 4 137744 – September 2005 3 137321 – June 2005 Amended notes on use of MCLADJ above 360 Mb/s. 2 137167 – June 2005 Rephrased RoHS compliance statement. 1 136885 – May 2005 Corrected description of connection for AGC and AGC pins in the Pin Description table. Clarified solder reflow profile descriptions. Corrected minor typing errors. GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 Changes and/or Modifications Added the tape and reel part number to Table 9-1: GS1574A Ordering Information Updated to latest Gennum template. Convert to Data Sheet. Corrected typing errors. Corrected process to BiCMOS. 2 of 16 Contents Features.................................................................................................................................................................1 Application...........................................................................................................................................................1 Description...........................................................................................................................................................1 Revision History .................................................................................................................................................2 1. Pin Out...............................................................................................................................................................4 1.1 GS1574A Pin Assignment ..............................................................................................................4 1.2 GS1574A Pin Descriptions .............................................................................................................4 2. Electrical Characteristics ............................................................................................................................6 2.1 Absolute Maximum Ratings ..........................................................................................................6 2.2 DC Electrical Characteristics ........................................................................................................6 2.3 AC Electrical Characteristics ........................................................................................................7 3. Solder Reflow Profiles..................................................................................................................................9 4. Test Circuit.................................................................................................................................................... 10 5. Input / Output Circuits ............................................................................................................................. 11 6. Detailed Description.................................................................................................................................. 13 6.1 Serial Digital Inputs ...................................................................................................................... 13 6.2 Cable Equalization ........................................................................................................................ 13 6.3 Programmable Mute Output ...................................................................................................... 14 6.4 Mute and Carrier Detect .............................................................................................................. 14 7. Application Information .......................................................................................................................... 15 7.1 PCB Layout ....................................................................................................................................... 15 7.2 Typical Application Circuit ........................................................................................................ 15 8. Package and Ordering Information...................................................................................................... 16 8.1 Package Dimensions ..................................................................................................................... 16 8.2 Recommended PCB Footprint ................................................................................................... 17 8.3 Packaging Data ............................................................................................................................... 17 8.4 Ordering Information ................................................................................................................... 18 GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 3 of 16 1. Pin Out VEE_A 1 SDI 2 VCC_A CD MUTE VCC_D 1.1 GS1574A Pin Assignment 16 15 14 13 12 VEE_D 11 SDO 3 10 SDO 4 9 VEE_D GS1574A (top view) AGC 7 8 Center Pad (bottom of package, internally bonded to VEE_A) MCLADJ 6 5 BYPASS VEE_A AGC SDI Figure 1-1: 16-Pin QFN 1.2 GS1574A Pin Descriptions Table 1-1: GS1574A Pin Descriptions Pin Number Name Timing Type 1, 4 VEE_A Analog Power Description Most negative power supply for analog circuitry. Connect to GND. 2, 3 SDI, SDI Analog Input 5, 6 AGC, AGC Analog – Serial digital differential input. External AGC capacitor. Connect pin 5 and pin 6 together as shown in the Typical Application Circuit on page 13. 7 BYPASS Not Synchronous Input 8 MCLADJ Analog Input Forces the Equalizing and DC RESTORE stages into bypass mode when HIGH. No equalization occurs in this mode. 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 only recommended for data rates up to 360Mb/s. For data rates above this, MCLADJ should be left floating. GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 4 of 16 Table 1-1: GS1574A Pin Descriptions (Continued) Pin Number Name Timing Type 9 VEE_D Analog Power Description Most negative power supply for the digital circuitry and output buffer. Connect to GND. 10, 11 SDO, SDO Analog Output Equalized serial digital differential output. 12 VEE_D Analog Power Most negative power supply for the digital circuitry and output buffer. Connect to GND. 13 VCC_D Analog Power Most positive power supply for the digital I/O pins of the device. Connect to +3.3V DC. 14 MUTE Not Synchronous Input CONTROL SIGNAL INPUT levels are LVCMOS/LVTTL compatible. (3.3V Tolerant) When the MUTE pin is set HIGH by the application interface, the serial digital output of the device will be forced to a steady state. When the MUTE pin is set LOW, the serial digital output of the device will be active. NOTE: This pin may be connected directly to the CD pin to allow mute on loss of carrier. 15 CD Not Synchronous Output STATUS SIGNAL OUTPUT Signal levels are LVCMOS/LVTTL compatible. Indicates the presence of a good input signal. When the CD pin is LOW, a good input signal has been detected. When this pin is HIGH, the input signal is invalid. This pin will indicate loss of carrier for data rates > 19Mb/s. 16 VCC_A Analog Power Most positive power supply for the analog circuitry of the device. Connect to +3.3V DC. – Center Pad – GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 Power Internally bonded to VEE_A. 5 of 16 2. Electrical Characteristics 2.1 Absolute Maximum Ratings Table 2-1: Absolute Maximum Ratings Parameter Value Supply Voltage -0.5V to +3.6 VDC Input ESD Voltage 2kV 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 Solder Reflow Temperature 260°C 2.2 DC Electrical Characteristics Table 2-2: DC Electrical Characteristics VCC = 3.3V ±5%, TA = 0°C to 70°C, unless otherwise shown Parameter Symbol Conditions Min Typ Max Units Notes 3.135 3.3 3.465 V ±5% Supply Voltage VCC – Power Consumption PD TA = 25°C – 215 – mW – – – – 343 mW – Is TA = 25°C – 65 – mA – VCMOUT TA = 25°C – VCC - ΔVSDO/2 – V – Input Common Mode Voltage VCMIN TA = 25°C – 1.75 – V – MCLADJ DC Voltage (to mute signal) – 0m, TA = 25°C – 1.3 – V – MCLADJ Range – TA = 25°C – 0.5 – V – 2.4 – – V – – – 0.4 V – Supply Current Output Common Mode Voltage CD Output Voltage VCD(OH) Carrier not present VCD(OL) Carrier present GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 6 of 16 Table 2-2: DC Electrical Characteristics (Continued) VCC = 3.3V ±5%, TA = 0°C to 70°C, unless otherwise shown Parameter Symbol Conditions Min Typ Max Units Notes Mute Input Voltage Required to Force Outputs to Mute VMute Min to Mute 2.0 – – V – Mute Input Voltage Required to Force Outputs Active VMute Max to Activate – – 0.8 V – 2.3 AC Electrical Characteristics Table 2-3: AC Electrical Characteristics VCC = 3.3V ±5%, TA = 0°C to 70°C, unless otherwise shown Parameter Symbol Conditions Min Typ Max Units Notes Serial input data rate DRSDO – 143 – 1485 Mb/s – Input Voltage Swing ΔVSDI TA =25°C, differential 720 800 950 mVp-p 1 Output Voltage Swing ΔVSDO 100Ω load, TA =25°C, differential – 750 – mVp-p – – 270Mb/s Belden 1694A: 0-350m Belden 8281: 0-280m – 0.2 – UI 2,5 – 1.485Gb/s Belden 1694A: 0-140m Belden 8281: 0-100m – 0.25 – UI 2,5 – 1.485Gb/s Belden 1694A: 140-200m – 0.3 – UI 4,5 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 3 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. 0m cable length. 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. Tested on CB1574A board from 5MHz to 2GHz. 4. 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. 5. Equalizer Pathological test signal is used. GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 7 of 16 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. 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 3-1: Maximum Pb-free Solder Reflow Profile (Preferred) 60-150 sec. Temperature 10-20 sec. 230°C 220°C 3°C/sec max 183°C 6°C/sec max 150°C 100°C 25°C Time 120 sec. max 6 min. max Figure 3-2: Standard Pb Solder Reflow Profile GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 8 of 16 4. Test Circuit GigaBERT 1400 EXT. CLOCK DATA CLOCK OUT OUT 8281 or 1694A CABLE 50/75 IN GS1574A TEST BOARD EXT. CLOCK 1.485GHz/270MHz OUT CH. 1 OUT CH. 2 TDS 820 EXT. TRIGGER Figure 4-1: Test Circuit 5. Input / Output Circuits 3k 3k SDI SDI RC 3.6k 3.6k Figure 5-1: Input Equivalent Circuit VCC 12.2k + MCLADJ - 150µ Figure 5-2: MCLADJ Equivalent Circuit GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 9 of 16 50 50 SDO SDO Figure 5-3: Output Circuit MUTE, BYPASS Figure 5-4: MUTE and BYPASS Circuits CD CD Figure 5-5: CD Circuit GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 10 of 16 6. Detailed Description The GS1574A is a high speed BiCMOS IC designed to equalize serial digital signals. The GS1574A can equalize both HD and SD serial digital signals, and will typically equalize 200m of Belden 1694A cable at 1.485Gb/s and 350m at 270Mb/s. The GS1574A is powered from a single +3.3V power supply and consumes approximately 215mW of power. 6.1 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. 6.2 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 6-1. +187.5mV VCM = 2.925V typical SDO -187.5mV SDO +187.5mV 50 50 VCM = 2.925V typical -187.5mV Figure 6-1: Typical Output Voltage Levels GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 11 of 16 6.3 Programmable Mute Output For SMPTE 259M inputs, the GS1574A incorporates a programmable threshold output mute (MCLADJ). In applications where there are multiple input channels using the GS1574A, it is advantageous to have a programmable mute output to avoid signal crosstalk. The output of the GS1574A can be muted when the input signal decreases below a certain input level. This threshold is determined using the input voltage applied to the MCLADJ pin. 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 is only recommended for data rates up to 360Mb/s. For data rates above this, MCLADJ should be left floating. 6.4 Mute and Carrier Detect The GS1574A includes a MUTE input pin that allows the application interface to mute the serial digital output at any time. Set the MUTE pin HIGH to mute SDO and SDO. In this case, the outputs will mute regardless of the setting of the BYPASS pin. A Carrier Detect output pin (CD) indicates the presence of a valid signal at the input of the GS1574A. When CD is LOW, the device has detected a valid input on SDI and SDI. When CD is HIGH, the device has not detected a valid input. NOTE: CD will only detect loss of carrier for data rates greater than 19Mb/s. The CD output pin may be connected directly to the MUTE input pin to enable automatic muting of the GS1574A when no valid input signal has been detected. NOTE: If the maximum cable length is exceeded and the device is not in bypass mode the GS1574A will not assert the CD pin even if a carrier is present. GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 12 of 16 7. Application Information 7.1 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: • 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 GS1574A input components to minimize parasitic capacitance. • The PCB ground plane is removed under the GS1574A output components to minimize parasitic capacitance. • High speed traces are curved to minimize impedance changes. 7.2 Typical Application Circuit CD MUTE VCC VCC 13 VCC_D 14 MUTE 6.2nH 15 CD VCC_A 16 10n 1 VEE_A SDI 1μF 2 75Ω 1μF 3 10nF VEE_D SDI SDO GS1574A SDI SDO 12 + 4.7μF SDO 11 10 + 5 6 7 MCLADJ VEE_A AGC 4 AGC 37.4Ω BYPASS SDO 75Ω VEE_D 9 4.7μF 8 MCLADJ 470nF 470nF BYPASS NOTE: All resistors in Ohms, capacitors in Farads, and inductors in Henrys, unless otherwise noted. Figure 7-1: GS1574A Typical Application Circuit GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 13 of 16 8. Package and Ordering Information 8.1 Package Dimensions A 2.76+/-0.10 2X 4.00+/-0.05 PIN 1 AREA DATUM A 2.76+/-0.10 B 0.40+/-0.05 4.00+/-0.05 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 0.00-0.05 0.85+/-0.05 0.65/2 TERMINAL TIP 0.65 DETAIL B SCALE:NTS Figure 8-1: Package Dimensions GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 14 of 16 8.2 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 for analog circuitry in the device (VEE_A) by a minimum of 5 vias. Note: Suggested dimensions only. Final dimensions should conform to customer design rules and process optimizations. 8.3 Packaging Data Table 8-1: 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, θj-c 31.0°C/W Junction to Air Thermal Resistance, θj-a (at zero airflow) 43.8°C/W Psi 11.0°C/W Pb-free and RoHS compliant Yes GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 15 of 16 9. Ordering Information Table 9-1: GS1574A Ordering Information Part Number Package Temperature Range GS1574ACNE3 16-pin QFN 0°C to 70°C GS1574ACTE3 16-pin QFN (250pc tape and reel) 0°C to 70°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. 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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 2004 Gennum Corporation. All rights reserved. www.gennum.com GS1574A HD-LINX® II Adaptive Cable Equalizer Data Sheet 33416 - 10 August 2011 16 of 16 16