LT6557500MHz, 2200V/µs Gain of 2, Single Supply Triple Video Amplifi er with Input Bias ControlFEATURES –3dB Small-Signal Bandwidth: 500MHz■ –3dB 2VP-P Large-Signal Bandwidth: 400MHz■ Slew Rate: 2200V/µs■ Fixed Gain of 2, No External Resistors Required■ AC Coupling with Programmable DC Input Bias■ Output Swings to 0.8V of Supply Rails■ Full Video Swing with 5V Single Supply■ Diff Gain: 0.02%■ Diff Phase: 0.05°■ Enable/Shutdown Pin■ High Output Current: ±100mA■ Supply Range: 3V to 7.5V■ Operating Temperature Range: –40°C to 85°C■ Available in 16-Lead SSOP and 5mm × 3mm DFN Packages ■DESCRIPTIONThe LT®6557 is a high speed triple video amplifi er with an internal fi xed gain of 2 and a programmable DC input bias voltage. This amplifi er features a 400MHz 2VP-P signal bandwidth, 2200V/µs slew rate and a unique ability to drive heavy output loads to 0.8V of the supply rails, mak-ing the LT6557 ideal for a single 5V supply, wideband video application. With just one resistor, the inputs of all three amplifi ers can be programmed to a common voltage level, simplifying and reducing the need for external circuitry in the AC-coupled applications. Without the programmable resistor, the input bias circuit becomes inactive, allowing the use of an external clamp circuit or direct coupled input. The LT6557 has separate power supply and ground pins for each amplifi er to improve channel separation and to ease power supply bypassing. The LT6557 provides uncom-promised performance in many high speed applications where a low voltage, single supply is required. The LT6557 is available in 16-lead SSOP and 5mm × 3mm DFN packages. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.All other trademarks are the property of their respective owners.APPLICATIONS ■ ■ ■ ■LCD Video ProjectorsRGB HD Video Amplifi ersCoaxial Cable DriversLow Supply ADC DriversTYPICAL APPLICATIONAC-Coupled Triple Video DriverENGND22µFIN R75ΩIN RLT6557BCVV+OUT R500Ω5V75Ω220µF412ΩFast Large-Signal Transient ResponseGND R500Ω+–V+ R75Ω5V22µFIN G75ΩIN GGND G500Ω+–OUT G500Ω75Ω220µFV+ G75Ω5V22µFIN B75ΩIN BGND B500Ω+–OUT B500ΩV+ B75Ω220µF75Ω5V6557 TA01a6557fa1元器件交易网www.cecb2b.com
LT6557ABSOLUTE MAXIMUM RATINGS(Note 1)Total Supply Voltage (VS+ to GND) ...........................7.5VInput Current ........................................................±10mAOutput Current (Note 2) .......................................±70mAOutput Short-Circuit Duration (Note 2) ............Indefi niteOperating Temperature Range (Note 3) ...–40°C to 85°CSpecifi ed Temperature Range (Note 4) ....–40°C to 85°CJunction Temperature SSOP ................................................................150°C DFN ...................................................................125°CStorage Temperature Range SSOP .................................................–65°C to 150°C DFN ....................................................–65°C to 125°CLead Temperature (Soldering, 10 sec) SSOP ................................................................300°CPACKAGE/ORDER INFORMATIONTOP VIEWENGNDIN RGND RIN GGND GIN BGND B12345678G = +2G = +2G = +216BCV15V+14OUT R13V+ R12OUT G11V+ GV+ BENGNDIN RGND RIN GGND GIN BGND B12345678G = +2G = +2TOP VIEW17G = +216BCV15V+14OUT R13V+ R12OUT G11V+ G10OUT B9V+ B10OUT B9 GN PACKAGE16-LEAD PLASTIC SSOPTJMAX = 150°C, θJA = 110°C/WDHC PACKAGE16-LEAD (5mm × 3mm) PLASTIC DFNTJMAX = 125°C, θJA = 40°C/WEXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCBORDER PART NUMBERLT6557CGNLT6557IGNGN PART MARKING65576557IORDER PART NUMBERLT6557CDHCLT6557IDHCDHC PART MARKING*65576557Order Options Tape and Reel: Add #TRLead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBFLead Free Part Marking: http://www.linear.com/leadfree/Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container. The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VS = 5V, RL = 150Ω to VS/2, VEN = 0.4V, RBCV = open, unless otherwise noted.SYMBOLVOSIINRINCINPARAMETERInput Offset VoltageInput CurrentInput ResistanceInput CapacitanceCONDITIONSVIN = 1.25VVIN = 1.25VVIN = 0.75V to 1.75V, BCV (Pin 6) Openf = 1MHz●●●ELECTRICAL CHARACTERISTICSMINTYP12 153545MAX405070100UNITSmVmVµAµAkΩkΩpF6557fa90502001501.52元器件交易网www.cecb2b.com
LT6557 The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VS = 5V, RL = 150Ω to VS/2, VEN = 0.4V, RBCV = open, unless otherwise noted.SYMBOLAV ERRAV MATCHVIN(DC)PSRRVOLVOHISPARAMETERGain ErrorGain Match Between ChannelsInput Voltage BiasPower Supply Rejection RatioOutput Voltage Swing Low●ELECTRICAL CHARACTERISTICS
CONDITIONSVIN = 0.75V to 1.75VVIN = 0.75V to 1.75VRBCV = 348ΩVS = 4V to 6V, VIN = 1.25V●●●●MINTYP±0.5±0.5±0.4±0.4MAX±2.5±3.0±2.75±3.251.51.7UNITS%%%%VVdBdB1.00.842381.251.1050470.80.90.91.0VVVVOutput Voltage Swing High●4.14.04.24.122.525.0101025294501000Supply Current per Amplifi erTotal Supply Current (Disabled)VEN = 0.4V, RL = ∞, Includes IS of V+ (Pin 15)VEN = Open, RL = ∞VEN = 0.4V●●●●mAmAµAµAµAµAmAmAV/µsMHzMHzMHzMHzdBdBnsnsps%DegdBcdBcIENISCSR–3dB BW0.1dB BWFPBWXTalktStr, tfΔGΔΦHD2HD3Enable Pin CurrentShort-Circuit CurrentSlew Rate–3dB BandwidthGain Flatness ±0.1dB BandwidthFull Power BandwidthAll Hostile CrosstalkSettling TimeRise Time, Fall TimeDifferential GainDifferential Phase2nd Harmonic Distortion3rd Harmonic Distortion–250–300±70±401400–125–150±100±902200400500120VOUT = 1.25V to 3.75V (Note 5)VOUT = 2VP-PVOUT = 0.2VP-PVOUT = 2VP-PVOUT = 2VP-P (Note 6)f = 10MHz, VOUT = 2VP-Pf = 100MHz, VOUT = 2VP-PTo 1%, VOUT = 1.5V to 3.5VTo 0.1%10% to 90%, VOUT = 1.5V to 3.5VNTSC SignalNTSC Signalf = 10MHz, VOUT = 2VP-Pf = 10MHz, VOUT = 2VP-P220350–80–55478750.020.05–68–75Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: A heat sink may be required to keep the junction temperature below the Absolute Maximum Rating.Note 3: The LT6557C is guaranteed functional over the temperature range of –40°C and 85°C. Note 4: The LT6557C is guaranteed to meet specifi ed performance from 0°C to 70°C. The LT6557C is designed, characterized and expected to meet specifi ed performance from –40°C to 85°C but is not tested or QA sampled at these temperatures.The LT6557I is guaranteed to meet specifi ed performance from –40°C to 85°C.Note 5: Slew rate is 100% production tested on the R channel and measured on the rising edge of the output signal. The slew rate of the falling edge and of the G and B channels is guaranteed through design and characterization.Note 6: Large-signal bandwidth is calculated from slew rate: FPBW = SR/(π • VP-P)6557fa3
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LT6557TYPICAL PERFORMANCE CHARACTERISTICSGain Error DistributionGain Error Matching DistributionVoltage Gain vs TemperatureSupply Current per Ampifi ervs Supply Voltage504540SUPPLY CURRENT (mA)353025201510500126345SUPPLY VOLTAGE (V)78VOUT = VS/2Supply Current per Ampifi ervs TemperatureSupply Current per Ampifi ervs EN Voltage6557 G04EN Pin Current vs EN Pin VoltageInput Referred Offset Voltage vs TemperatureInput Bias Current vs Input Voltage6557fa4元器件交易网www.cecb2b.com
LT6557TYPICAL PERFORMANCE CHARACTERISTICSOutput Voltage vs Input VoltageOutput Voltage Swing vs Load Current (Output High)Output Voltage Swing vs Load Current (Output Low)Input Bias Voltage vs Resistanceat BCV PinInput Bias Voltage vs TemperatureBias Control Voltage vs TemperatureFrequency ResponseFrequency Response of Three Amplifi ersGain Flatness vs Frequency6557fa5元器件交易网www.cecb2b.com
LT6557TYPICAL PERFORMANCE CHARACTERISTICSFrequency Response with Capacitive LoadsLarge-Signal Group DelayCrosstalk Between Amplifi ers vs FrequencyOutput Impedance vs FrequencyInput Impedance vs FrequencyPSRR vs FrequencyDistortion vs FrequencyDistortion vs FrequencyInput Referred Noise Spectral Density6557fa6元器件交易网www.cecb2b.com
LT6557TYPICAL PERFORMANCE CHARACTERISTICSOverdriven Output Recovery 5VINVOUT6543VOLTAGE (V)32VOUT11VS = 5VVIN = 2.4VP-PRL = 15090255075100125150175200225250TIME (ns)6557 G28Enable/Disable ResponseVEN(DISABLE)VS = 5VVOUT = 2VP-PAC COUPLEDRL = 150WVIN = 0.5V/DIV, VOUT = 1V/DIV420VEN(ENABLE)–100.20.40.60.81.01.21.41.61.82.02.2TIME (ms)6557 G290Large-Signal Transient Response2.65Small-Signal Transient ResponseVS = 5VVIN = 50mVP-PRL = 15092.60OUTPUT (V)2.552.502.45024681012141618202224TIME (ns)6557 G31PIN FUNCTIONSEN (Pin 1): Enable Control Pin. The part is enabled when this pin is pulled low. An internal pull-up resistor of 40k will turn the part off if this pin is unconnected.GND (Pin 2): Ground Reference for Enable Pin (Pin 1) and Bias Control Voltage Pin (Pin 16). This pin must be connected externally to ground.IN R (Pin 3): Red Channel Input. This pin has a nominal impedance of 200kΩ with input bias circuit inactive, Pin 16 open.GND R (Pin 4): Ground of Red Channel Amplifi er. This pin is not internally connected to other ground pins and must be connected externally to ground.IN G (Pin 5): Green Channel Input. This pin has a nomi-nal impedance of 200kΩ with input bias circuit inactive, Pin 16 open.GND G (Pin 6): Ground of Green Channel Amplifi er. This pin is not internally connected to other ground pins and must be connected externally to ground.IN B (Pin 7): Blue Channel Input. This pin has a nominal impedance of 200kΩ with input bias circuit inactive, Pin 16 open.GND B (Pin 8): Ground of Blue Channel Amplifi er. This pin is not internally connected to other ground pins and must be connected externally to ground. 6557fa7元器件交易网www.cecb2b.com
LT6557PIN FUNCTIONS
V+ B (Pin 9): Positive Supply Voltage of Blue Channel Amplifi er. This pin is not internally connected to other supply voltage pins and must be externally connected to the supply voltage bus with proper bypassing for best performance, see Power Supply Considerations.OUT B (Pin 10): Blue Channel Output.V+ G (Pin 11): Positive Supply Voltage of Green Channel Amplifi er. This pin is not internally connected to other supply voltage pins and must be externally connected to the supply voltage bus with proper bypassing for best performance, see Power Supply Considerations.OUT G (Pin 12): Green Channel Output.V+ R (Pin 13): Positive Supply Voltage of Red Channel Amplifi er. This pin is not internally connected to other supply voltage pins and must be externally connected to the supply voltage bus with proper bypassing for best performance, see Power Supply Considerations. OUT R (Pin 14): Red Channel Output.V+ (Pin 15): Positive Supply Voltage of Control Circuitry. This pin is not internally connected to other supply voltage pins and must be externally connected to supply voltage bus with proper bypassing for best performance, see Power Supply Considerations.BCV (Pin 16): Bias Control Voltage. A resistor connected between Pin 16 and Pin 2 (GND) will generate a DC voltage bias at the inputs of the three amplifi ers for AC coupling application, see Programmable Input Bias.Exposed Pad (Pin 17, DFN Package): Ground. This pad must be soldered to PCB and is internally connected to GND (Pin 2).APPLICATIONS INFORMATION
Power Supply ConsiderationsThe LT6557 is optimized to provide full video signal swing output when operated from a standard 5V single supply. Due to the supply current involved in ultrahigh slew rate amplifi ers like the LT6557, selection of the lowest workable supply voltage is recommended to minimize heat genera-tion and simplify thermal management. Temperature rise at the internal devices (TJ) must be kept below 150°C (SSOP package) or 125°C (DFN package), and can be estimated from the ambient temperature (TA) and power dissipation (PD) as follows: TJ = TA + PD • 40°C/W for DFN package or TJ = TA + PD • 110°C/W for SSOP packagewhere PD = (IS + 0.5 • IO) • VS(TOTAL)The latter equation assumes (conservatively) that the output swing is small relative to the supply and RMS load current (IO) is bidirectional (as with AC coupling).The grounds are separately pinned for each amplifi er to minimize crosstalk. Operation from split supplies can be accomplished by connecting the LT6557 ground pins to the negative rail. Since the amplifi er gain is referenced to its ground pins, the actual signals are referenced to the negative rail, in this case, and DC coupled applications need to take this into consideration. With dual supplies, recommended voltages range from nominal ±2.5V to ±3.3V.The ultrahigh frequency (UHF) operating range of the LT6557 requires that careful printed circuit layout prac-tices be followed to obtain maximum performance. Trace lengths between power pins and bypass capacitors should be minimized (<0.1 inch) and one or more dedicated ground planes should be employed to minimize parasitic inductance. Poor layout or breadboarding methods can seriously impact amplifi er stability, frequency response and crosstalk performance. A 2.2µF and a 10µF bypass capacitor is recommended for the LT6557supply bus, plus a 10nF high frequency bypass capacitor at each individual power pin.6557fa8
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LT6557APPLICATIONS INFORMATIONProgrammable Input BiasThe LT6557 contains circuitry that provides a user-pro-grammed bias voltage to the inputs of all three amplifi er sections. The internal biasing feature is designed to mini-mize external component count in AC-coupled applica-tions, but may be defeated if external biasing is desired. Figure 1 shows the simplifi ed equivalent circuit feeding the noninverting input of each amplifi er. A programming resistor from Pin 16 to GND (Pin 2) establishes the nominal V+no-signal amplifi er input bias condition according to the following relationship:VBIAS(IN)=VPIN16•9.1kRSET where VPIN16 = 0.048V typical.For single 5V supply operation, a 400Ω programming resistor is generally optimal. In applications that demand maximum amplifi er linearity, or if external biasing is preferred (in DC-coupled applications, for example), the internal biasing circuitry may be disabled by leaving Pin 16 open. With Pin 16 open, input loading is approximately 200kΩ.Shutdown ControlVI = PIN16RSET2.5kIN9.1k6557 F01Figure 1. Simplifi ed Programmable Input Bias Circuit DiagramV+40kBIASCIRCUITRYENThe LT6557 may be placed into a shutdown mode, where all three amplifi er sections are deactivated and power sup-ply draw is reduced to approximately 10µA. When the EN pin is left open, an internal 40k pull-up resistor brings the pin to V+ and the part enters the shutdown mode. Pulling the pin more than approximately 1.5V below V+ will en-able the LT6557 (see Figure 2 for equivalent circuit). The pull-down current required to activate the part is typically 125µA. In most applications, the EN pin is simply con-nected to ground (for continuous operation) or driven directly by a CMOS-level logic gate (see Figure 3 for examples). Response time is typically 50ns for enabling, and 1µs for shutdown. In shutdown mode, the feedback resistors remain connected between the output pins and the individual ground (or V– connected) pins.Figure 2. Simplifi ed Shutdown Circuit DiagramV+1ENDISABLE2ENDISABLE1V+LT6557LT655726557 F03(3a) Open Drain or Open Collector(3b) CMOS Gate with Shared SupplyFigure 3. Suitable Shutdown Pin Drive Circuits6557fa9元器件交易网www.cecb2b.com
LT6557SIMPLIFIED SCHEMATICV+ENBIASOUTIN500Ω500Ω6557 SSPACKAGE DESCRIPTIONGN Package16-Lead Plastic SSOP (Narrow .150 Inch)(Reference LTC DWG # 05-08-1641).045 ±.005 .189 – .196*(4.801 – 4.978)161514131211109.254 MIN.150 – .165.229 – .244(5.817 – 6.198) .150 – .157**(3.810 – 3.988).009(0.229)REF.0165 ±.0015.0250 BSC1 .015 ± .004× 45°(0.38 ± 0.10).0532 – .0688(1.35 – 1.75)2345678.004 – .0098(0.102 – 0.249)RECOMMENDED SOLDER PAD LAYOUT.007 – .0098(0.178 – 0.249)0° – 8° TYP.016 – .050(0.406 – 1.270)NOTE:1. CONTROLLING DIMENSION: INCHESINCHES2. DIMENSIONS ARE IN(MILLIMETERS)3. DRAWING NOT TO SCALE *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006\" (0.152mm) PER SIDE**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010\" (0.254mm) PER SIDE.008 – .012(0.203 – 0.305)TYP.0250(0.635)BSCGN16 (SSOP) 02046557fa10元器件交易网www.cecb2b.com
LT6557PACKAGE DESCRIPTIONDHC Package16-Lead Plastic DFN (5mm × 3mm)(Reference LTC DWG # 05-08-1706)0.65 ±0.053.50 ±0.051.65 ±0.052.20 ±0.05(2 SIDES)PACKAGEOUTLINE0.25 ± 0.050.50 BSC4.40 ±0.05(2 SIDES)RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS5.00 ±0.10(2 SIDES)R = 0.20TYPR = 0.115TYP9160.40 ± 0.103.00 ±0.10(2 SIDES)PIN 1TOP MARK(SEE NOTE 6)1.65 ± 0.10(2 SIDES)PIN 1NOTCH (DHC16) DFN 110380.200 REF0.75 ±0.054.40 ±0.10(2 SIDES)10.25 ± 0.050.50 BSC0.00 – 0.05NOTE:1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDECPACKAGE OUTLINE MO-2292. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE5. EXPOSED PAD SHALL BE SOLDER PLATED6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGEBOTTOM VIEW—EXPOSED PAD6557fanformation furnished by Linear Technology Corporation is believed to be accurate and reliable.However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.11元器件交易网www.cecb2b.com
LT6557TYPICAL APPLICATIONSplit Supply Operation with DC Bias ServoRELATED PARTSPART NUMBERLT1399LT1675LT6550/LT6551LT6553LT6554LT6555LT6556LT6558DESCRIPTION300MHz Triple Current Feedback Amplifi er250MHz Triple RGB Multiplexer3.3V Triple and Quad Video Buffers650MHz Gain of 2 Triple Video Amplifi er650MHz Gain of 1 Triple Video Amplifi er650MHz Gain of 2 Triple Video Multiplexer750MHz Gain of 1 Triple Video MultiplexerCOMMENTS0.1dB Gain Flatness to 150MHz, Shutdown100MHz Pixel Switching, 1100V/µs Slew Rate, 16-Lead SSOP110MHz Gain of 2 Buffers in MS PackageOptimized for Driving 75Ω CablesPerformance Similar to the LT6553 with AV = 1, 16-Lead SSOPOptimized for Driving 75Ω CablesHigh Slew Rate 2100V/µs550MHz, 2200V/µs Gain of 1 Triple Video Amplifi erSingle Supply with Input Bias Control6557fa12Linear Technology CorporationLT/LWI 0606 • REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com© LINEAR TECHNOLOGY CORPORATION 2006
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