PRODUCT DESCRIPTION The SGM911 is a video buffer which integrates triple Gain rail-to-rail output driver and triple th output reconstruction filter, it has 5MHz - bandwidth and 159V/µs slew rate. SGM911 provides improved image quality compared with passive LC filters and discrete drivers solution. Operating from single supplies ranging from +.V to +5.5V and sinking an ultra-low 9.mA quiescent current, the SGM911 is ideally suited for battery powered applications. SGM911 can be DC-coupled or AC-coupled with input video signal, such as the output of DAC. Internal diode clamps and bias circuitry may be used if AC-coupled inputs are required. SGM911 also integrates an internal level shift circuit which avoids sync-pulse being clipped and allows DC-coupled output. The driver in SGM911 can drive DC or AC-coupled single (15Ω) or dual (75 Ω) loads. The SGM911 has Green SO-8 package. BLOCK DIAGRAM FEATURES Triple th Order 5MHz (HD) Filters Transparent Input Clamping Output Driver Gain and Drive Dual Video Load Rail-to-Rail Output Input Voltage Range Includes Ground AC or DC Coupled Inputs AC or DC Coupled Outputs Operates from.v to 5.5V Single Power Supply Low Power 9.mA Total Supply Current Green SO-8 Package APPLICATIONS Video Amplifier Cable and Satellite Set- Top Box Communications Device Video on Demand Portable and Handheld Product Personal Video Recorder DVD Players HDTV Projector IN1 Transparent Clamp 5MHz, th order OUT1 IN Transparent Clamp 5MHz, th order OUT IN Transparent Clamp 5MHz, th order OUT REV. B.
PACKAGE/ORDERING INFORMATION ORDER NUMBER PACKAGE DESCRIPTION TEMPERATURE RANGE PACKAGE OPTION MARKING INFORMATION SGM911XS/TR SO-8 - to +15 Tape and Reel, 5 SGM911XS PIN CONFIGURATIONS (Top View) PIN DESCRIPTION SGM911 IN1 1 8 IN IN +V S 7 5 SO-8 OUT1 OUT OUT GND PIN NAME FUNCTION 1 IN1 Video input, channel 1 IN Video input, channel IN Video input, channel +V S Power supply 5 GND Ground OUT Filtered output, channel 7 OUT Filtered output, channel 8 OUT1 Filtered output, channel 1 ABSOLUTE MAXIMUM RATINGS Supply Voltage, V+ to V-... V Input Voltage... GND -. V to (+V S) +.V Storage Temperature Range... 5 to +15 Junction Temperature...15 Operating Temperature Range... to +15 Power Dissipation, P D @ T A = 5 SO-8...8W Package Thermal Resistance SO-8, θ JA... 18 /W Lead Temperature Range (Soldering 1 sec)... ESD Susceptibility HBM... MM... CAUTION This integrated circuit can be damaged by ESD if you don t pay attention to ESD protection. SGMICRO recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. NOTE Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS: V S = +5.V (At R L = 15Ω connected to GND, V IN = 1Vpp,and C IN =.1µF, all outputs AC coupled with µf,unless otherwise noted) PARAMETER CONDITIONS +5 +5 SGM911 MIN/MAX OVER TEMPERATURE - to 15 UNITS MIN/ MAX INPUT CHARACTERISTICS Output Level Shift Voltage (V OLS ) Clamp Charge Current Voltage Gain ( A V ) V IN = V, no load V IN = V CLAMP -1mV R L = 15Ω 9 -. mv ma OUTPUT CHARACTERISTICS Output Voltage High Swing V IN = V, R L = 15Ω to GND.8 V POWER SUPPLY Operating Voltage Range. V 5.5 V Power Supply Rejection Ratio (PSRR) V s = +.5 V to + 5. V Quiescent Current (I Q) V IN = V 9. ma DYNAMIC PERFORMANCE -.1 Bandwidth R L = 15Ω 9. MHz - Bandwidth R L = 15Ω 8. MHz Filter Response (Normalized Gain) f IN = 7MHz -. Slew Rate V Output Step, 8% to % 159 V/µs Differential Gain (DG) PAL DC coupled. % PAL AC coupled. % Differential Phase (DP) PAL DC coupled.7 PAL AC coupled.57 Group Delay Variation (D/DT) f = KHz, MHz ns Crosstalk (channel - to - channel) at 1MHz -7 Fall Time.V STEP, 8% to % 7. ns Rise Time.V STEP, 8% to % 7. ns MIN MAX Specifications subject to change without notice.
ICAL PERFORMANCE CHARACTERISTICS At V S = +5.V, T A = +5, R L = 15Ω, all outputs AC coupled with µf, unless otherwise noted. Frequency Response 7 Phase vs. Frequency Normalized Gain () - - -9-1 -15.1 1 1 1 Frequency (MHz) Phase (degree) 18 9-9 -18-7.1 1 1 1 Frequency (MHz).75 Large Signal Step Response. Small Signal Step Response.5. Output Voltage (V).5 -.5 -.5 Output Voltage (V).1 -.1 -. -.75 -. -.1.1....5..7 Time (µs) -.1.1....5..7 Time (µs) Group Delay (ns) 1 5-5 -1 Group Delay vs. Frequency.1 1 1 1 Frequency (MHz) Gain Error (%) 1.8 1. 1. 1. 1.8... -. Gain Error vs. Temperature -5-5 5 5 75 1 15 Temperature ( )
ICAL PERFORMANCE CHARACTERISTICS At V S = +5.V, T A = +5, R L = 15Ω, all outputs AC coupled with µf, unless otherwise noted. Quiescent Current (ma) 55 5 5 5 Quiescent Current vs. Temperature Quiescent Current (ma) 8 Quiescent Current vs. Supply Voltage No Load V IN = V -5-5 5 5 75 1 15 Temperature ( ).5.5.5 5 5.5 Supply Voltage (V) 5
APPLICATIONS INFORMATION Functional Description SGM911 operates from a single +.V to +5.5V supply. In application, SGM911 is a fully integrated solution for filtering and buffering HDTV signals in front of video decoder or behind video encoder. For example, SGM911 can replace three passive LC filters and three amplifier drivers at R\G\B and Y\Pb\Pr output side in set-top box and DVD player, this solution can help you save PCB size and production cost, it also improves video signal performance comparing with traditional design using discrete components. SGM911 features a DC-coupled input buffer, -pole low-pass filter to eliminate out-of-band noise of video encoder, and a gain of + in the output amplifier to drive load. The AC or DC-coupled input buffer eliminates sync crush, droop, and field tilt. The output of SGM911 also can be DC-coupled or AC-coupled. Input Considerations Besides AC coupling, the SGM911 inputs also can be DC-coupled. In DC coupling application, No input coupling capacitors are needed because the amplitude of input video signal from DAC includes ground and extends up to 1.V, then SGM911 can be directly connected to the output of a single-supply, current-output DAC without any external bias network. Some time, if DAC s output level exceeds the range of V to 1.V, or SGM911 is driven by an unknown external source or a SCART switch which has its own clamping circuit, AC coupling is needed in such application. Output Considerations The SGM911 outputs can be DC-coupled or AC-coupled. While V is input, the SGM911 output voltage is 9mV typically. In DC coupling design, one resistor is used to Connect SGM911 s output pin with external load directly, this serial back-termination resistor is used to match the impedance of the transmission line between SGM911 and external load to cancel the signal reflection. The SGM911 outputs can sink and source current allowing the device to be AC-coupled with external load, in AC coupling, µf at least capacitor will be used in order to cancel field tilt. output pin as possible, a large ground plane is also needed to ensure optimum performance. The input and output termination resistors should be placed as close to the related pin of SGM911 as possible to avoid performance degradation. The PCB traces at the output side should have characteristic impedance in order to match the characteristic impedance cable connecting external load. In design, please keep the board trace at the inputs and outputs of the SGM911 as short as possible to minimize the parasitic stray capacitance and noise pickup. Typical Application Diagram The following schematic in Figure 1 is normally used for AC coupled output and DC-coupled input with DAC which has an output voltage range of V to 1.V. AC coupled output offer slightly lower power dissipation and high ESD protection ability. Figure is a kind of special application in STB. R/Pr G/Y B/Pb 1 IN1 IN IN GND 5 +VS OUT1 SGM911.1µF or.1µf OUT OUT 8 7 1µF µf µf µf +5V R/Pr G/Y B/Pb Figure 1. Input DC Coupling and Output AC Coupling Application Schematic Power-Supply Bypassing and Layout Correct power supply bypassing is very important for optimizing video performance in design. One.1µF and one 1µF capacitors are always used to Bypass V CC pin of SGM911, please place these two capacitors as close to the SGM911
.1µF or.1µf 1µF V CC SOC Of STB Y Pb 1 IN1 IN +V S 8 OUT1 A SGM911 7 OUT B µf µf µf µf to Loading 1 to Loading to Loading 1 to Loading to Loading 1 The three ports of A,B and C should be immediate as signal output pin in layout Pr IN OUT C GND µf µf to Loading 5 Figure. The DC Coupling Circuit Schematic is recommended in applications of STB 7
PACKAGE OUTLINE DIMENSIONS SO-8 D e θ L E1 E b c A A1 A Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 1.5 1.75.5.9 A1.1.5..1 A 1.5 1.55.5.1 b..51.1. c.17.5..1 D.7 5.1.185. E.8..15.157 E1 5.8..8. e 1.7 BSC.5 BSC L. 1.7.1.5 θ 8 8 8
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