GS2994 GS2994 Adaptive Cable Equalizer Key Features Description • SMPTE 424M, SMPTE 292M and SMPTE 259M compliant • Automatic cable equalization The GS2994 is a high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75Ω coaxial cable. • Multi-standard operation from 143Mb/s to 2.97Gb/s • Performance optimized for 270Mb/s, 1.485Gb/s and 2.97Gb/s. Typical equalized length of Belden 1694A cable: 140m at 2.97Gb/s 220m at 1.485Gb/s 400m at 270Mb/s • Supports DVB-ASI at 270Mb/s • Manual bypass (useful for low data rates with slow rise/fall times) • Programmable carrier detect with squelch threshold adjustment • Automatic power-down on loss of signal Standby power <30mW (typical) • Differential outputs support DC-coupling to 1.2V, 2.5V and 3.3V CML logic • 0/6 dB gain boost selection pin • Selectable de-emphasis: 2dB, 4dB and 6dB • Standard EIA/JEDEC logic control and status signal levels • Single 3.3V power supply operation • 167mW power consumption (typical) • Wide operating temperature range of -40ºC to +85ºC • Small footprint QFN package (4mm x 4mm) Footprint compatible with the GS2974 and the GS2984 • The GS2994 features DC restoration to compensate for the DC content of SMPTE pathological test patterns. The Carrier Detect output pin (CD) indicates whether a valid input signal has been detected. It can be connected directly to the SLEEP pin to enable automatic power-down upon loss of carrier. In the manual sleep mode, a voltage programmable threshold, which can be changed via the SQ_ADJ pin, forces CD high when the input signal amplitude falls below the threshold. This allows the GS2994 to distinguish between low-amplitude SDI signals and noise at the input of the device. The equalizing and DC restore stages are disengaged when the BYPASS pin is HIGH. No equalization occurs in Bypass mode. The GS2994 includes a gain selection pin (GAIN_SEL) which, when tied HIGH, compensates for 6dB flat attenuation. The differential outputs can be DC-coupled to Gennum 3.3V cable drivers and reclockers and to industry-standard 1.2V, 2.5V and 3.3V CML logic using the VCC_O pin. In general, DC-coupling to any termination voltage between 1.2V and 3.3V is supported. The GS2994 also includes programmable de-emphasis with three operating levels in order to support long PCB traces. The GS2994 is footprint and drop-in compatible with existing GS2974 and GS2984 designs. The device is available in a 16-pin, 4mm x 4mm QFN package. Pb-free and RoHS compliant Applications • The device is designed to support SMPTE 424M, SMPTE292M and SMPTE 259M, and is optimized for performance at 270Mb/s, 1.485Gb/s and 2.97Gb/s. SMPTE 424M, SMPTE 292M and SMPTE 259M coaxial cable serial digital interfaces Power consumption of the GS2994 is typically 167mW when DC-coupled at 1.2V. The GS2994 is Pb-free, and the encapsulation compound does not contain halogenated flame retardant. This component and all homogeneous subcomponents are RoHS compliant. GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 www.semtech.com 1 of 20 SQ_ADJ BYPASS SLEEP CD Squelch Adjust Carrier Detect Mute VCC_A SDI Equalizer SDI VCC_O DC Restore SDO SDO Output VEE_O VEE_A OP_CTL AGC AGC AGC GS2994 Functional Block Diagram Revision History Version ECR PCN Date 4 158405 – August 2012 Updates in GS2994 Pin Descriptions, Table 2-1: DC Electrical Characteristics, and Input/Output Circuits. 3 157635 – February 2012 Added pull-down resistor to Figure 3-4. Updated the descriptions for the BYPASS and SLEEP pins in Table 1-1. Clarification to column headings in Table 4-1. 2 157164 – November 2011 Updated the descriptions for the GAIN_SEL and SQ_ADJ pins in Table 1-1 to indicate that they have internal pull-down resistors. 1 155124 – October 2010 0 154492 – June 2010 Converted to Preliminary Data Sheet. Updated the power and current consumption values in Table 2-1: DC Electrical Characteristics. B 153758 – March 2010 Removed the 470nF capacitor (between AGC and GND) from Figure 5-1: GS2994 Typical Application Circuit. A 153233 – January 2010 GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 Changes and/or Modifications Converted to Data Sheet. Increased cable length to 220m at 1.485Gb/s. New document. 2 of 20 Contents 1. Pin Out...............................................................................................................................................................4 1.1 GS2994 Pin Assignment .................................................................................................................4 1.2 GS2994 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. Input/Output Circuits ..................................................................................................................................9 4. Detailed Description.................................................................................................................................. 11 4.1 Serial Data Inputs .......................................................................................................................... 11 4.2 Cable Equalization ........................................................................................................................ 11 4.3 Serial Digital Outputs ................................................................................................................... 12 4.4 Programmable Squelch Adjust (SQ_ADJ) .............................................................................. 12 4.5 Carrier Detect, Sleep, and Auto-Sleep .................................................................................... 13 4.6 GAIN_SEL ......................................................................................................................................... 14 4.7 Adjustable Output Swing, De-Emphasis and Mute ............................................................ 14 5. Application Information .......................................................................................................................... 15 5.1 High Gain Adaptive Cable Equalizers .................................................................................... 15 5.2 PCB Layout ....................................................................................................................................... 15 5.3 Typical Application Circuit ........................................................................................................ 16 6. Package & Ordering Information .......................................................................................................... 17 6.1 Package Dimensions ..................................................................................................................... 17 6.2 Packaging Data ............................................................................................................................... 17 6.3 Recommended PCB Footprint ................................................................................................... 18 6.4 Marking Diagram ........................................................................................................................... 18 6.5 Solder Reflow Profiles .................................................................................................................. 19 6.6 Ordering Information ................................................................................................................... 19 GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 3 of 20 1. Pin Out SDI 3 GAIN_SEL 4 Ground Pad (bottom of package) CD SLEEP VCC_O 13 GS2994 16-pin QFN (top view) 12 VEE_O 11 SDO 10 SDO 9 5 6 7 8 SQ_ADJ 2 14 BYPASS SDI 15 AGC 1 16 AGC VEE_A VCC_A 1.1 GS2994 Pin Assignment OP_CTL Figure 1-1: GS2994 Pin Out 1.2 GS2994 Pin Descriptions Table 1-1: GS2994 Pin Descriptions Pin Number Name Timing Type Description 1 VEE_A Analog Power Most negative power supply connection for the input buffer, core and control circuits. Connect to GND. 2, 3 SDI, SDI Analog Input 4 GAIN_SEL Not Synchronous Input Serial digital differential input. Input Sensitivity Control. When LOW the sensitivity is 800mV. When HIGH the sensitivity is 400mV. Includes an internal pull-down resistor. 5, 6 AGC, AGC Analog – External AGC capacitor. Connect pin 5 and pin 6 as shown in the Typical Application Circuit on page 16. 7 BYPASS Not Synchronous Input Core Bypass control signal input. Forces the Equalizing and DC RESTORE stages into bypass mode when HIGH. No equalization occurs in this mode. Includes an internal pull-down resistor. GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 4 of 20 Table 1-1: GS2994 Pin Descriptions (Continued) Pin Number Name Timing Type Description 8 SQ_ADJ Analog Input Squelch Threshold Adjust. Adjusts the input signal amplitude threshold of the carrier detect function. The output can be muted when the input signal amplitude is too low by connecting the CD and OP_CTL pins together through some external components. In this case, when CD is LOW (0V), OP_CTL is forced LOW (0V), and when CD is HIGH (2.5V), OP_CTL is forced HIGH (3.3V). The input level at which the part is muted can be set through the SQ_ADJ pin through suitable voltage variances as described in Section 4.4. NOTE: when the SQ_ADJ functionality is used and/or in auto_mute, the auto sleep feature is not allowed, and the SLEEP pin should be left open. Includes an internal pull-down resistor. 9 OP_CTL Not Synchronous Input CONTROL SIGNAL INPUT Controls the Output Swing, De-emphasis, and Mute features of the SDO and SDO outputs. When connected to GND, the output swing is 800mV with no de-emphasis. When connected to the 3.3V analog power supply, the output is MUTED. Includes an internal pull down resistor. See Section 4.7 for all other control options. 10, 11 SDO, SDO Analog Output 12 VEE_O Analog Power Equalized serial digital differential output. Most negative power supply for the output buffer. Connect to GND. 13 VCC_O Analog Power Most positive power supply connection for the output buffer of the device. Connect to +1.2V ~ +3.3V DC. 14 SLEEP Not Synchronous Input CONTROL SIGNAL INPUT When set HIGH, the GS2994 is powered-down except for the Carrier Detect functionality. Includes an internal pull-down resistor. 15 CD Not Synchronous Output Carrier Detect status signal output. Signal levels are LVCMOS/LVTTL compatible. Indicates the presence of an 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. See Section 4.5. 16 VCC_A Analog Power Most positive power supply for the input buffer, core and control circuits of the device. Connect to +3.3V DC. − Center Pad − GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 Power Internally bonded to VEE_A. 5 of 20 2. Electrical Characteristics 2.1 Absolute Maximum Ratings Parameter Value Supply Voltage - Core -0.5V to +3.6V DC Supply Voltage - Output Driver -0.5V to +3.6V DC Input ESD Voltage (HBM) 5kV Storage Temperature Range -50°C < Ts < 125°C Input Voltage Range (any input) -0.3 to (VCC_A +0.3)V Operating Temperature Range -40°C to +85°C Solder Reflow Temperature 260°C 2.2 DC Electrical Characteristics Table 2-1: DC Electrical Characteristics VCC_A = 3.3V ±5%, TA = -40°C to +85°C, unless otherwise shown Parameter Symbol Conditions Min Typ Max Units Notes Supply Voltage - Core VCC_A – 3.135 3.3 3.465 V – Supply Voltage - Output Driver VCC_O – 1.14 1.2 1.26 V 1 – 2.375 2.5 2.625 V 1 – 3.135 3.3 3.465 V 1 TA = 25°C VCC_O = 1.2V ΔVSDO = 400mV – 167 – mW 2 TA = 25°C VCC_O = 1.2V ΔVSDO = 800mV – 179 – mW 2 TA = 25°C VCC_O = 3.3V ΔVSDO = 400mV – 191 – mW 2 TA = 25°C VCC_O = 3.3V ΔVSDO = 800mV – 223 – mW 2 Power Consumption PD GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 6 of 20 Table 2-1: DC Electrical Characteristics (Continued) VCC_A = 3.3V ±5%, TA = -40°C to +85°C, unless otherwise shown Parameter Supply Current - Core Supply Current - Output Driver Symbol Conditions Is IOutput Driver Min Typ Max Units Notes TA = 25°C – 48.7 – mA 2, 3 TA = 25°C, ΔVSDO = 800mV – 17.3 – mA 2 TA = 25°C, ΔVSDO = 400mV – 9.3 – mA 2 TA = 25°C – 1.8 – V – Input Common Mode Voltage VCMIN SQ_ADJ DC Voltage (to mute signal) – 0m, TA = 25°C – 3.2 – V – SQ_ADJ Range – TA = 25°C – 0.9 – V – 2.0 – – V – CD Output Voltage VCD(OH) Carrier not present VCD(OL) Carrier present – – 0.4 V – Sleep, GAIN_SEL, BYPASS, Input High Level Voltage VIH – 1.7 – – V 4 Sleep, GAIN_SEL, BYPASS, Input Low Level Voltage VIL – – – 0.7 V 4 NOTES: 1. 2. 3. 4. VCC_O operates from 1.2V through 3.3V (+/-5%). De-emphasis off. An additional 3mA when de-emphasis is enabled. Digital pins are 2.5V, but 3.3V tolerant. 2.3 AC Electrical Characteristics Table 2-2: AC Electrical Characteristics VCC_A = 3.3V ±5%, TA = -40°C to +85°C, unless otherwise shown Parameter Symbol Conditions Min Typ Max Units Notes Serial input data rate DRSDO – 143 – 2970 Mb/s – Input Voltage Swing ΔVSDI TA =25°C, differential, 270Mb/s and 1.485Gb/s 720 800 950 mVp-p 1 TA =25°C, differential, 2.97Gb/s 720 800 880 mVp-p 1 100Ω load, TA =25°C, differential, OP_CTL set for high swing – 800 – mVp-p – 100Ω load, TA =25°C, differential, OP_CTL set for low swing – 400 – mVp-p – Output Voltage Swing ΔVSDO GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 7 of 20 Table 2-2: AC Electrical Characteristics (Continued) VCC_A = 3.3V ±5%, TA = -40°C to +85°C, unless otherwise shown Parameter Symbol Conditions Min Typ Max Units Notes – 2.97Gb/s Belden 1694A: 0-120m – – 0.25 UI 2, 5 – 2.97Gb/s Belden 1694A: 120-140m – 0.3 – UI 3, 5 – 1.485Gb/s Belden 1694A: 0-180m – – 0.25 UI 2, 5 – 1.485Gb/s Belden 1694A: 180-220m – 0.25 – UI 3, 5 – 270Mb/s Belden 1694A: 0-400m – – 0.2 UI 2, 5 – 2.97Gb/s & 1.485Gb/s 20% - 80% – 75 – ps – – 270Mb/s – 150 – ps – Mismatch in rise/fall time – – – – 30 ps – Duty cycle distortion – 3G/HD – – 30 ps – SD – – 55 ps – Output Jitter of Various Cable Lengths and Data Rates Output Rise/Fall time Overshoot – – – – 10 % – Input Return Loss – – 15 21 – dB 4 Input Resistance – single-ended – 1.9 – kΩ – Input Capacitance – single-ended – 1.3 – pF – Output Resistance – single-ended – 50 – Ω – NOTES: 1. 0m cable length. 2. All parts are production tested. In order to guarantee jitter over the full range of specification (VCC_A = 3.3V ±5%, TA = -40°C to +85°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_A = 3.3V, TA = 25°C and 800mV launch swing from the SDI cable driver. 4. Tested on a GS2994 board from 5MHz to 3GHz. 5. GAIN_SEL = 0 GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 8 of 20 3. Input/Output Circuits 4k 4k + SQ_ADJ - SDI SDI RC 5.25k 5.25k 82.4k Figure 3-1: Input Equivalent Circuit Figure 3-2: SQ_ADJ Equivalent Circuit 50 50 SDO SDO Figure 3-3: Output Circuit GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 9 of 20 SLEEP, BYPASS, GAIN_SEL CD 100kΩ Figure 3-4: SLEEP, BYPASS and GAIN_SEL Circuits Figure 3-5: CD Circuit VCC Internal Reference OP_CTL Internal Reference 100kΩ Figure 3-6: OP_CTL GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 10 of 20 4. Detailed Description The GS2994 is a high-speed BiCMOS IC designed to equalize serial digital signals. The GS2994 can equalize 3Gb/s, HD and SD serial digital signals, and will typically equalize 140m of Belden 1694A cable at 2.97Gb/s, 220m at 1.485Gb/s and 400m at 270Mb/s. The GS2994 can be powered from a single +3.3V power supply, and is footprint compatible with the GS2974 and GS2984 equalizers. When using 1.2V CML, the GS2994 typically consumes approximately 167mW of power. 4.1 Serial Data Inputs The Serial Data signal can 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. 4.2 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. GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 11 of 20 4.3 Serial Digital Outputs The digital output signals have a nominal voltage of either 800mVp-p or 400mVp-p as set by the OP_CTL pin. Table 4-1 below shows the typical output voltage levels across different common mode voltages and swing values: Table 4-1: Typical Output Voltage Levels Supply Voltage Output Driver 400mVp-p Swing (DC-coupled Output) 400mVp-p Swing (AC-coupled Output) 800mVp-p Swing (DC-coupled Output) 800mVp-p Swing (AC-coupled Output) 3.3V 3.2V 3.1V 3.1V 2.9V 2.5V 2.4V 2.3V 2.3V 2.1V 1.8V 1.7V 1.6V 1.6V 1.4V 1.2V 1.1V 1V 1V 0.8V 4.4 Programmable Squelch Adjust (SQ_ADJ) The GS2994 incorporates a programmable Squelch Adjust (SQ_ADJ) threshold. This feature can be useful in applications where there are multiple input channels using the GS2994 and the maximum gain can be limited to avoid crosstalk. The SQ_ADJ pin acts to change the threshold of the Carrier Detect (CD) pin, through voltage level variances. When the input signal drops below a certain threshold, the CD pin will be driven HIGH, indicating that there is not a valid input signal. In applications where programmable squelch adjust is not required, the SQ_ADJ pin may be left unconnected. Figure 4-1 shows the relationship between the SQ_ADJ voltage and cable length at which CD will assert or deassert. 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: SQ_ADJ is designed to operate when the device is in manual sleep mode. In this situation, CD should not be connected to SLEEP. GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 12 of 20 3.2 SQ_ADJ (V) 3.0 2.8 2.6 2.4 2.2 2.0 0 50 100 150 200 250 300 350 400 450 Cable Length (m) Figure 4-1: SQ_ADJ vs. Cable Length (VCC=3.3V, room temperature, 800mV launch swing) 4.5 Carrier Detect, Sleep, and Auto-Sleep The GS2994 includes a SLEEP input pin, which allows the application interface to put the GS2994 into a low-power sleep mode, consuming less than 30mW. Set the SLEEP pin HIGH to place the chip in its sleep state. In this mode, the Carrier Detect output will still function in order to detect valid Serial Digital Input. The Carrier Detect output pin (CD) indicates the presence of a valid signal at the input of the GS2994. 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. The Carrier Detect output still functions when the GS2994 is in sleep mode, such that a valid Serial Digital Input can be detected at all times. In the sleep state, the carrier detect functionality requires that the GAIN_SEL input be set to 0. Auto-Sleep can be enabled by connecting CD to SLEEP. When connected, the GS2994 will automatically go into standby mode when there is a loss of Serial Digital Input signal. NOTE 1: CD will only detect loss of carrier for data rates greater than 19Mb/s. NOTE 2: If the maximum cable length is exceeded (set by the SQ_ADJ pin) and the device is not in Bypass mode, the CD pin will not be driven LOW, even if a carrier is present. NOTE 3: If the CD is connected to SLEEP, SQ_ADJ should either be left open, or connected to ground. Table 4-2: Sleep Input Table Sleep Function 0 The GS2994 operates normally 1 The GS2994 enters sleep mode. CD output remains valid GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 13 of 20 Table 4-3: CD Output Table CD Input Status 0 Valid Input on SDI, SDI pins 1 Input is not valid 4.6 GAIN_SEL The GS2994 has an option of compensating for 6dB of flat attenuation in applications where there has been some type of attenuation prior to the equalizer. \ Table 4-4: GAIN_SEL Input Table GAIN_SEL Function 0 No flat band gain is applied 1 6dB of flat attenuation will be compensated by the equalizer. 4.7 Adjustable Output Swing, De-Emphasis and Mute With the GS2994, the OP_CTL input pin determines the output swing and de-emphasis settings. The OP_CTL pin is an analog input to allow different combinations of output swing, de-emphasis and mute. The possible values are listed in Table 4-5 below: Table 4-5: OP_CTL Functions and Levels Level Swing De-emphasis Mute Voltage 0 800mV Off N 0 1 800mV 2dB N 1 x (VCC_A/8) 2 800mV 4dB N 2 x (VCC_A/8) 3 800mV 6dB N 3 x (VCC_A/8) 4 400mV Off N 4 x (VCC_A/8) 5 400mV 2dB N 5 x (VCC_A/8) 6 400mV 4dB N 6 x (VCC_A/8) 7 400mV 6dB N 7 x (VCC_A/8) 8 400mV N/A Y VCC_A Auto_mute can be enabled by connecting CD to OP_CTL through external components, such that when CD is HIGH (2.5V), OP_CTL is forced HIGH (3.3V) and when CD is LOW GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 14 of 20 (0V), OP_CTL is forced LOW (0V). The input level at which the part is muted can be set by the SQ_ADJ pin through suitable voltage variances as described in Section 4.4. NOTE: when SQ_ADJ functionality is used and/or in Auto_mute, the SLEEP pin should be left open. 5. Application Information 5.1 High Gain Adaptive Cable Equalizers The GS2994 is Gennum's latest multi-rate adaptive cable equalizer. In order to continue to extend the cable length that an equalizer will remain operational over, it is necessary to have high gain in the equalizer. A video cable equalizer must provide wide band gain over a range of frequencies in order to accommodate the range of data rates and signal patterns that are present in a SMPTE compliant serial video stream. The GS2994 has an increase in gain over the GS2974A at critical HD and 3Gb/s frequencies, and because of this, the GS2994 may be sensitive to signals at the input that the GS2974A will not be sensitive to. Small levels of signal or noise present at the input pins of the Equalizer may cause chatter at the output. In order to prevent this from happening, particular attention must be paid to board layout. 5.2 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 3Gb/s 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 GS2994 input components to minimize parasitic capacitance • The PCB ground plane is removed under the GS2994 output components to minimize parasitic capacitance • High-speed traces are curved to minimize impedance changes GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 15 of 20 5.3 Typical Application Circuit VCC_O VCC_A 10nF 10nF 6.2nH 2 16 VCC_A BYPASS VCC_O 13 7 SDO SDI 11 4.7μF 1μF 3 SDI 1μF 8 9 4 14 5 470nF 6 SDO 4.7μF SQ_ADJ OP_CTL GAIN_SEL SLEEP CD 15 AGC AGC VEE_O 37.4Ω GS2994 10 1 TAB 75Ω VEE_A 75Ω 12 Figure 5-1: GS2994 Typical Application Circuit GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 16 of 20 6. Package & Ordering Information 6.1 Package Dimensions 2.76+/-0.10 PIN #1 IDENTIFICATION Φ0.4500 DATUM A PIN 1 AREA 2X 0.40+/-0.05 4.00+/-0.05 B CENTER TAB 2.76+/-0.10 A 4.00+/-0.05 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 0.65 DETAIL B SCALE:NTS 6.2 Packaging Data Parameter Value Package Type 4mm x 4mm 16-pin QFN Package Drawing Reference JEDEC M0220 Moisture Sensitivity Level 1 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 Yes GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 17 of 20 6.3 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. 6.4 Marking Diagram Pin 1 ID GS2994 XXXXE3 YYWW GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 XXXX - Lot/Work Order ID YYWW - Date Code YY - 2-digit year WW - 2-digit week number 18 of 20 6.5 Solder Reflow Profiles The GS2994 is available in a Pb-free package. It is recommended that the Pb-free package be soldered with Pb-free paste using the 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 6.6 Ordering Information Part Number Package Temperature Range GS2994 GS2994-INE3 16-pin QFN -40°C to 85°C GS2994 GS2994-INTE3 16-pin QFN Tape & Reel (250pcs) -40°C to 85°C GS2994 GS2994-INTE3Z 16-pin QFN Tape & Reel (2500pcs) -40°C to 85°C GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 19 of 20 DOCUMENT IDENTIFICATION CAUTION DATA SHEET ELECTROSTATIC SENSITIVE DEVICES Information relating to this product and the application or design described herein is believed to be reliable, however such information is provided as a guide only and Semtech assumes no liability for any errors in this document, or for the application or design described herein. Semtech reserves the right to make changes to the product or this document at any time without notice. DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION © Semtech 2012 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified range. SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. Contact Information Semtech Corporation Gennum Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111, Fax: (805) 498-3804 www.semtech.com GS2994 GS2994 Adaptive Cable Equalizer Data Sheet 53967 - 4 August 2012 20 of 20 20