|
If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
Datasheet File OCR Text: |
LT6550/LT6551 3.3V Triple and Quad Video Amplifiers FEATURES s s s s s s s s s s s s DESCRIPTIO Single Supply Operation from 3V to 12.6V Small (3mm x 5mm) MSOP 10-Lead Package Internal Resistors for a Gain of Two 340V/s Slew Rate 110MHz -3dB Bandwidth 30MHz Flat to 0.25dB 3% Settling Time: 20ns Input Common Mode Range Includes Ground Rail-to-Rail Output High Output Drive: 60mA Operating Temperature Range: - 40C to 85C 24-Bit RGB The LT(R)6550/LT6551 are 3.3V triple and quad high speed video amplifiers. These voltage feedback amplifiers drive double terminated 50 or 75 cables and are configured for a fixed gain of 2, eliminating six or eight external gain setting resistors. The LT6550/LT6551 feature 110MHz -3dB bandwidth, high slew rates and fast settling, making them ideal for RGB video processing. The LT6551 quad is designed for single supply operation and the LT6550 triple can be used on either single or split supplies. On a single 3.3V supply, the input voltage range extends from ground to 1.55V and the output swings to within 400mV of the supply voltage while driving a 150 load. These features, combined with the ability to accept RGB video signals without the need for AC coupling or level shifting of the incoming signals, make the LT6550/ LT6551 an ideal choice for low voltage video applications. Both the LT6550 and LT6551 are available in the small 10-Pin MSOP package and utilize a flow-thru pin out. The small footprint results in a compact high performance video amplifier solution. APPLICATIO S s s s s s s Automotive Displays LCD and CRT Compatible RGB Amplifiers Coaxial Cable Drivers Low Voltage High Speed Signal Processing Set Top Boxes , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO LT6551 450 RIN 75 - OA + 450 GIN 75 - OA + 450 BIN 75 - OA + 450 SYNCIN 75 - OA + 450 450 450 450 3.3V Single Supply LT6551 RGB Plus SYNC Cable Driver Output Step Response 3.3V ROUT 75 75 GOUT 75 75 BOUT 75 75 VIN 0V VS = 3.3V VIN = 0.5V TO 1.25V f = 10MHz 6550/51 TA01b 75 SYNCOUT 75 6551 TA01a GND U VOUT 0V 65501f U U 1 LT6550/LT6551 ABSOLUTE (Note 1) AXI U RATI GS Specified Temperature Range (Note 3) LT6550C/LT6551C ..............................-40C to 85C LT6550I/LT6551I ................................ - 40C to 85C Maximum Junction Temperature .......................... 150C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C Total Supply Voltage LT6550 (VCC TO VEE) ........................................ 12.6V LT6551 (VCC TO GND) ...................................... 12.6V Input Current (Note 9) ........................................ 10mA Output Short-Circuit Duration (Note 2) ............ Indefinite Operating Temperature Range ................ - 40C to 85C PACKAGE/ORDER I FOR ATIO TOP VIEW IN1 IN2 IN3 GND VEE 1 2 3 4 5 X2 X2 X2 ORDER PART NUMBER 10 9 8 7 6 VCC OUT1 OUT2 OUT3 N/C LT6550CMS LT6550IMS MS10 PART MARKING LTB9 LTC1 MS10 PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 150C, JA = 110C/W (Note 4) Consult LTC Marketing for parts specified with wider operating temperature ranges. 3.3V ELECTRICAL CHARACTERISTICS PARAMETER DC Output Accuracy Output Voltage Matching Input Current Input Impedance, VIN/IIN Input Noise Voltage Density Input Noise Current Density Voltage Gain (Note 5) CONDITIONS The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VCC = 3.3V, VGND = 0V; VIN = 0.75V LT6550 (Pins 1,2,3); LT6551 (Pins 1,2,3,4). VEE = 0V LT6550 (Pin 5), unless otherwise noted. MIN q q q q No Load, VOUT Ideal = 1.5V Between Any Two Outputs Any Input VIN = 0V to 1V f = 100kHz (Note 10) f = 100kHz (Note 10) 0.25V VIN 1.25V No Load RL = 150 RL = 75, 0.25V VIN 0.75V VIN = - 0.1V No Load ISINK = 5mA ISINK = 10mA VIN = 1.75V No Load RL = 150 RL = 75 Output Voltage Swing Low Output Voltage Swing High 2 U U W WW U W TOP VIEW IN1 IN2 IN3 IN4 GND 1 2 3 4 5 X2 X2 X2 X2 ORDER PART NUMBER 10 9 8 7 6 VCC OUT1 OUT2 OUT3 OUT4 LT6551CMS LT6551IMS MS10 PART MARKING LTC2 LTC3 MS10 PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 150C, JA = 110C/W (Note 4) TYP 30 25 15 MAX 70 75 65 UNITS mV mV A k nV/Hz pA/Hz 100 300 12 8 q q 1.9 1.9 1.85 10 60 90 3.0 2.5 2.0 3.2 2.9 2.5 2.1 2.1 2.15 30 150 200 V/V V/V V/V mV mV mV V V V 65501f q q q q q LT6550/LT6551 3.3V ELECTRICAL CHARACTERISTICS PARAMETER PSRR Minimum Supply Voltage (Note 6) Output Short-Circuit Current Supply Current per Amplifier (Note 7) q The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VCC = 3.3V, VGND = 0V; VIN = 0.75V LT6550 (Pins 1,2,3); LT6551 (Pins 1,2,3,4). VEE = 0V LT6550 (Pin 5), unless otherwise noted. CONDITIONS VCC = 3V to 10V, VIN = 0.5V VIN = 1V, VOUT = 0V q q q MIN 40 3 35 25 TYP 48 50 8.5 MAX UNITS dB V mA mA 10 11 mA mA V/s V/s MHz MHz dB ns ns % % Deg dB Slew Rate (Note 8) Small Signal -3dB Bandwidth Gain Flatness Gain Matching Settling Time to 3% Settling Time to 1% % Overshoot Differential Gain Differential Phase Channel Separation RL = 150, VOUT = 0.5V to 2.5V Measured from 1V to 2V RL = 150 Less than 0.25dB Any One Channel to Any Other Channel RL = 150, VOUT = 1V to 2.5V RL = 150, VOUT = 1V to 2.5V VOUT = 1V to 2.5V, RL = 150 RL = 150, Black Level = 0.6V at Device Output RL = 150, Black Level = 0.6V at Device Output Measured at 10MHz q 140 115 250 90 30 0.15 20 30 5 0.09 0.09 60 5V ELECTRICAL CHARACTERISTICS PARAMETER Output Accuracy Output Voltage Matching Input Current Input Impedance, VIN /IIN Input Noise Voltage Density Input Noise Current Density Voltage Gain (Note 5) VIN = 0V to 2V CONDITIONS The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VCC = 5V, VGND = 0V; VIN = 1.25V LT6550 (Pins 1,2,3); LT6551 (Pins 1,2,3,4). VEE = 0V LT6550 (Pin 5), unless otherwise noted. MIN q q q q TYP 30 40 15 MAX 70 90 65 UNITS mV mV A k nV/Hz pA/Hz No Load, VOUT Ideal = 2.5V Between Any Two Outputs 100 300 12 8 f = 100kHz (Note 10) f = 100kHz (Note 10) 0.25V VIN 1.75V No Load RL = 150 RL = 75, 0.25V VIN 1.25V, 0C TA 70C (Only) VIN = - 0.1V No Load ISINK = 5mA ISINK = 10mA VIN = 2.6V No Load RL = 150 RL = 75, 0C TA 70C (Only) VCC = 3V to 10V, VIN = 0.5V q q q q q q q q q q q 1.9 1.9 1.85 10 60 90 4.6 3.5 2.5 40 3 4.8 4.1 3.2 48 2.1 2.1 2.15 30 150 200 V/V V/V V/V mV mV mV V V V dB V Output Voltage Swing Low Output Voltage Swing High PSRR Minimum Supply Voltage (Note 6) 65501f 3 LT6550/LT6551 The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VCC = 5V, VGND = 0V; VIN = 1.25V LT6550 (Pins 1,2,3); LT6551 (Pins 1,2,3,4). VEE = 0V LT6550 (Pin 5), unless otherwise noted. PARAMETER Output Short-Circuit Current CONDITIONS VIN = 1V, VOUT = 0V 0C TA 70C - 40C TA 85C q q q 5V ELECTRICAL CHARACTERISTICS MIN 45 40 30 TYP 60 MAX UNITS mA mA mA Supply Current per Amplifier (Note 7) Slew Rate Small Signal -3dB Bandwidth Gain Flatness Gain Matching Settling Time to 3% Settling Time to 1% % Overshoot Differential Gain Differential Phase Channel Separation RL = 150, VOUT = 0.5V to 3.5V, Measured from 1V to 3V RL = 150 Less than 0.25dB Any One Channel to Any Other Channel RL = 150, VOUT = 1V to 2.5V RL = 150, VOUT = 1V to 2.5V VOUT = 1V to 2.5V, RL = 150 RL = 150, Black Level = 1V at Device Output RL = 150, Black Level = 1V at Device Output Measured at 10MHz 220 180 9.5 340 110 30 0.15 20 35 5 0.05 0.05 60 11.5 12.5 mA mA V/s V/s MHz MHz dB ns ns % % Deg dB q 5V ELECTRICAL CHARACTERISTICS PARAMETER Output Offset Output Voltage Matching Input Current Input Impedance, VIN /IIN Input Noise Voltage Density Input Noise Current Density Voltage Gain VIN = -1V to 1V CONDITIONS (LT6550 Only) The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 5V, VIN = 0V (Pins 1,2,3) VGND = 0V (Pin 4) unless otherwise noted. MIN q q q q TYP 30 20 20 MAX 70 60 70 UNITS mV mV A k nV/Hz pA/Hz Between Any Two Outputs 200 500 12 8 f = 100kHz (Note 10) f = 100kHz (Note 10) - 1.75V VIN 1.75V No Load RL = 150 RL = 75, - 1V VIN 1V VIN = 2.6V No Load RL = 150 RL = 75, 0C TA 70C (Only) VS = 2.5V to 5V, VO = 0V 0C TA 70C -40C TA 85C q q q q q q q q q q 1.9 1.9 1.9 4.6 3.5 2.6 38 45 40 30 4.8 4.2 3.2 48 60 2.1 2.1 2.1 V/V V/V V/V V V V dB mA mA mA Output Voltage Swing PSRR Output Short-Circuit Current Supply Current per Amplifier Slew Rate Small Signal -3dB Bandwidth RL = 150, VOUT = -3V to 3V, Measured from -2V to 2V RL = 150 400 300 8.5 600 90 10.5 12 mA mA V/s V/s MHz 65501f q 4 LT6550/LT6551 5V ELECTRICAL CHARACTERISTICS PARAMETER Gain Flatness Gain Matching Settling Time to 3% Settling Time to 1% % Overshoot Differential Gain Differential Phase Channel Separation CONDITIONS Less than 0.25dB (LT6550 Only) The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 5V, VIN = 0V (Pins 1,2,3) VGND = 0V (Pin 4) unless otherwise noted. MIN TYP 30 0.15 20 30 5 0.15 0.09 60 MAX UNITS MHz dB ns ns % % Deg dB Any One Channel to Any Other Channel RL = 150, VOUT = 1V to 2.5V RL = 150, VOUT = 1V to 2.5V VOUT = 1V to 2.5V, RL = 150 RL = 150, Black Level = 0V at Device Output RL = 150, Black Level = 0V at Device Output Measured at 10MHz Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. This depends on the power supply voltage and how many amplifiers are shorted. Note 3: The LT6550C/LT6551C are guaranteed to meet specified performance from 0C to 70C and are designed, characterized and expected to meet specified performance from -40C to 85C but are not tested or QA sampled at these temperatures. The LT6550I/LT6551I are guaranteed to meet specified performance from - 40C to 85C. Note 4: Thermal resistance varies depending upon the amount of PC board metal attached to Pin 5 of the device. JA is specified for a 2500mm2 test board covered with 2oz copper on both sides. Note 5: Gain is measured by changing the input voltage, and dividing the change in output voltage by the change in input voltage. Note 6: Minimum supply voltage is guaranteed by the PSRR test. Note 7: The supply current specification includes additional output current through the internal feedback and gain resistor. Note 8: Guaranteed by correlation to slew rate at 5V and 5V. Note 9: The inputs are protected from ESD with diodes to the supplies. Note 10: Noise is input referred, including internal gain resistors. 5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551) Supply Current Per Amplifier vs Supply Voltage 14 12 VIN = 0.75V RL = GND = 0V 3.5 TA = 125C TA = 25C 3.0 2.5 SUPPLY CURRENT (mA) 10 8 6 4 2 0 0 1 2 3 4 56 VCC (V) 7 8 9 10 INPUT BIAS (A) VOUT (V) TA = -55C 6550/51 G01 UW 2.0 1.5 1.0 0.5 0 Output Voltage vs Input Voltage VS = 3.3V, 0V RL = 150 TA = 125C TA = 25C TA = -55C -10 Input Bias Current vs Temperature VS = 5V, 0V -11 VOUT = 2.5V -12 -13 -14 -15 -16 -17 -18 -19 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 VIN (V) 6550/51 G02 -20 -50 -25 50 25 0 75 TEMPERATURE (C) 100 125 6550/51 G03 65501f 5 LT6550/LT6551 5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551) Input Bias Current vs Input Voltage 0 VS = 3.3V, 0V INPUT BIAS CURRENT (A) INPUT BIAS CURRENT (A) -5 TA = 125C -5 -10 -15 -20 -25 -30 1.4 1.6 6550/51 G04 TA = 125C OUTPUT SATURATION VOLTAGE (V) -10 TA = 25C -15 TA = -55C -20 -25 0 0.2 0.4 0.6 0.8 1.0 1.2 INPUT VOLTAGE (V) Output Saturation Voltage vs Load Current (Output Low) 1 OUTPUT SATURATION VOLTAGE (V) OUTPUT SHORT-CIRCUIT CURRENT (mA) VS = 5V, 0V VIN = -0.1V 70 65 60 55 50 45 -50 -25 0 25 50 75 TEMPERATURE (C) 100 125 VS = 3.3V, 0V GAIN (dB) TA = 125C 0.1 TA = 25C TA = -55C 0.01 0.01 1 0.10 10 SINKING LOAD CURRENT (mA) 100 6550/51 G07 Gain Flatness vs Frequency 6.2 VS = 3.3V, 0V VOUT = 1.5V DC RL = 150 BANDWIDTH (MHz) 6.1 100 80 60 3.3V, 0V, -3dB -3dB BANDWIDTH (MHz) GAIN (dB) 6.0 5.9 5.8 20 5.7 10k 0 -50 100k 1M 10M FREQUENCY (Hz) 100M 6550/51 G10 6 UW 0 0 90 85 80 75 140 120 40 Input Bias Current vs Input Voltage VS = 5V, 0V 1 Output Saturation Voltage vs Load Current (Output High) VS = 5V, 0V VIN = 2.6V TA = 125C 0.1 TA = 25C TA = -55C TA = 25C TA = -55C 0.5 1.0 1.5 INPUT VOLTAGE (V) 2.0 2.5 6550/51 G05 0.01 0.01 1 0.1 10 SOURCING LOAD CURRENT (mA) 100 6550/51 G06 Output Short-Circuit Current vs Temperature VIN = 1V 10 9 8 VS = 5V, 0V 7 6 5 4 3 2 1 Gain and Phase vs Frequency 0 VS = 3.3V, 0V VOUT = 1.5V DC RL = 150 PHASE -20 -40 -60 PHASE (DEG) GAIN -80 -100 -120 -140 -160 -180 0 10k 100k 1M 10M FREQUENCY (Hz) -200 100M 500M 6550/51 GO9 6550/51 G08 -3dB, -0.25dB Bandwidth vs Temperature VOUT = 1.5V DC RL = 150 5V, 0V, -3dB 260 240 220 200 180 160 140 120 100 80 -25 0 25 50 75 TEMPERATURE (C) 100 125 -3dB Bandwidth vs VCC VOUT = 1.5V DC GND = 0V RL = 150 5V, 0V, -0.25dB 3.3V, 0V, -0.25dB 3 4 5 6 7 8 VCC (V) 9 10 11 12 6550/51 G11 6550/51 G12 65501f LT6550/LT6551 5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551) Frequency Response with Capacitive Loads 12 11 10 9 VS = 5V, 0V VOUT = 2.5V DC RL = 150 CL = 100pF CL = 50pF CL = 150pF 45 40 35 VS = 5V, 0V GAIN (dB) 8 7 6 5 4 3 2 10k 100k OVERSHOOT (%) 30 25 SLEW RATE (V/s) CL = 10pF 1M 10M FREQUENCY (Hz) 100M 500M 6550/51 G13 Power Supply Rejection Ratio vs Frequency 60 POWER SUPPLY REJECTION RATIO (dB) 50 40 30 20 10 +PSSR VS = 5V, 0V VOUT = 2.5V DC RL = 150 OUTPUT IMPEDANCE () GAIN(dB) 0 10k 100k 1M 10M FREQUENCY (Hz) 100M 1000M 6550/51 G16 Gain Matching vs Frequency 0 -30 -0.2 GAIN MATCHING(dB) DISTORTION (dBc) -0.4 -0.6 -0.8 VS = 3.3V, 0V VOUT = 1.5V DC, ANY CHANNEL PAIR 100k 1M 10M FREQUENCY (Hz) 100M 1000M -80 -90 100k CL = 20pF VS = 5V, 0V VOUT = 2.5V DC RL = 150 6550/51 G21 -1.0 10k 6550/51 G19 UW 20 15 10 5 0 10 100 10 1 0.1 10k -50 -60 -70 Capacitive Load Handling, Overshoot vs Capacitive Load 500 450 RL = OPEN 400 350 300 250 Slew Rate vs Temperature RL = 150 5V, 0V, RISING 5V, 0V, FALLING RL = 150 3.3V, 0V, RISING 3.3V, 0V, FALLING 200 150 -50 -25 100 CAPACITIVE LOAD (pF) 1000 6550/51 G14 50 25 75 0 TEMPERATURE (C) 100 125 6550/51 G15 Output Impedance vs Frequency VS = 5V, 0V VOUT = 2.5V DC 100 90 80 70 60 50 40 30 20 10 100k 1M 10M FREQUENCY (Hz) 100M 6550/51 G17 Channel Separation vs Frequency VS = 5V, 0V RL = 150 ANY CHANNEL PAIR 0 10k 100k 1M 10M FREQUENCY (Hz) 100M 1000M 6550/51 G18 2nd and 3rd Harmonic Distortion vs Frequency VS = 3.3V, 0V VO = 2VP-P (0.5V TO 2.5V) -40 RL = 150 Small Signal Response 2ND 3RD 1M FREQUENCY (Hz) 10M 6550/51 G20 65501f 7 LT6550/LT6551 5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551) Large Signal Response 5V TYPICAL PERFOR A CE CHARACTERISTICS VGND (Pin 4) = 0V Supply Current vs Total Supply Voltage 14 12 VOUT = 0V -10 INPUT BIAS CURRENT (A) SUPPLY CURRENT (mA) TA = 125C 10 8 6 4 2 0 0 TA = 25C TA = -55C -15 TA = 125C TA = 25C TA = -55C OUTPUT OFFSET VOLTAGE (mV) 2 3 4 5 1 TOTAL SUPPLY VOLTAGE (V) 6 6550/51 G23 Output Voltage Matching vs Temperature of Three Typical Parts 25 OUTPUT SHORT-CIRCUIT CURRENT (mA) OUTPUT VOLTAGE MATCHING (mV) 20 VS = 5V VIN = 0V ANY CHANNEL PAIR GAIN(dB) 15 10 5 0 -50 -25 50 25 75 0 TEMPERATURE (C) 100 125 6550/51 G26 8 UW -20 -25 95 90 85 80 75 70 -50 -25 CL = 20pF VS = 5V, 0V VOUT = 0.5V TO 3.5V RL = 150 6550/51 G22 UW (LT6550 Only) Output Offset Voltage vs Temperature of Three Typical Units 60 50 40 30 20 10 0 -10 VS = 5V VIN = 0V Input Bias Current vs Input Voltage VS = 5V -30 -2.5 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 2.5 INPUT VOLTAGE (V) 6550/51 G24 -20 -50 -25 0 25 50 75 100 125 TEMPERATURE (C) 6550/51 G25 Output Short-Circuit Current vs Temperature VS = 5V VIN = 1V 10 9 8 SINKING 7 6 5 4 3 2 1 50 25 75 0 TEMPERATURE (C) 100 125 Gain and Phase vs Frequency 0 PHASE -20 -40 -60 GAIN PHASE (DEG) -80 -100 -120 -140 SOURCING VS = 5V VOUT = 0V DC RL = 150 100k 1M 10M FREQUENCY (Hz) 100M -160 -180 -200 1000M 0 10k 6550/51 G27 6550/51 G28 65501f LT6550/LT6551 5V TYPICAL PERFOR A CE CHARACTERISTICS VGND (Pin 4) = 0V Gain Flatness vs Frequency 6.2 VS = 5V VOUT = 0V DC RL = 150 GAIN MATCHING(dB) 6.1 GAIN (dB) GAIN (dB) 6.0 5.9 5.8 5.7 10k 100k 1M 10M FREQUENCY (Hz) 100M 6550/51 G29 Slew Rate 800 750 SLEW RATE (/V s) POWER SUPPLY REJECTION RATIO (dB) VS = 5V RL = 150 RISING 700 650 600 550 500 -50 -25 40 30 20 10 0 -10 10k -PSRR OUTPUT IMPEDANCE () FALLING 50 25 75 0 TEMPERATURE (C) 100 125 6550/51 G32 Channel Separation vs Frequency 100 90 80 70 GAIN (dB) VS = 5V RL = 150 ANY CHANNEL PAIR DISTORTION (dBc) 60 50 40 30 20 10 0 10k 100k 1M 10M FREQUENCY (Hz) 100M 1000M 6550/51 G35 UW (LT6550 Only) Frequency Response with Capacitive Loads 12 11 VS = 5V VOUT = 0V DC RL = 150 Gain Matching vs Frequency 0 -0.2 10 9 CL = 150pF CL = 100pF CL = 50pF -0.4 8 7 6 5 -0.6 CL = 10pF -0.8 VS = 5V ANY CHANNEL PAIR 100k 1M 10M FREQUENCY (Hz) 100M 1000M 4 3 2 10k MM 100k 1M 10M FREQUENCY (Hz) 100M 500M 6550/51 G31 -1.0 10k 6550/51 G30 Power Supply Rejection Ratio vs Frequency 60 50 +PSRR VS = 5V VOUT = 0V DC RL = 150 100 Output Impedance vs Frequency VS = 5V VOUT = 0V DC 10 1 100k 1M 10M FREQUENCY (Hz) 100M 1000M 0.1 10k 100k 1M 10M FREQUENCY (Hz) 100M 6550/51 G34 6550/51 G33 2nd and 3rd Harmonic Distortion vs Frequency VS = 5V VO = 2VP-P -40 RL = 150 -50 0V -60 -70 -80 -90 100k 2ND 3RD -30 Large Signal Response CL = 20pF VS = 5V RL = 150 1M FREQUENCY (Hz) 10M 6550/51 G36 6550/51 G37 65501f 9 LT6550/LT6551 BLOCK DIAGRA S LT6550 Block Diagram 450 IN1 - OA + 450 IN2 - OA + 450 IN3 - OA + OUT3 GND IN4 450 OUT2 IN3 450 OUT1 IN2 450 VCC IN1 VEE 6550 BD01 10 W LT6551 Block Diagram 450 450 VCC - OA + 450 450 OUT1 - OA + 450 450 OUT2 - OA + 450 450 OUT3 - OA + N/C GND 6551 BD02 OUT4 65501f LT6550/LT6551 APPLICATIO S I FOR ATIO Amplifier Characteristics Figure 1 shows a simplified schematic of one channel of the LT6551 quad. Resistors RF and RG provide an internal gain of 2. (The LT6550 triple is a slight variation with the gain setting resistor, RG, connected to a separate ground pin). The input stage consists of transistors Q1 to Q8 and resistor R1. This topology allows for high slew rates at low supply voltages. There are back-to-back series diodes, D1 to D4, across the + and - inputs of each amplifier to limit the differential input voltage to 1.4V. RIN limits the current through these diodes if the input differential voltage exceeds 1.4V. The input stage drives the degeneration resistors of PNP and NPN current mirrors, Q9 to Q12, that convert the differential signals into a single-ended output. The complementary drive generator supplies current to the output transistors that swing from rail-to-rail. Input Voltage Range The input voltage range is VEE to (VCC - 1.75V) over temperature. If the device is operated on a single 3V supply RF 450 I1 I2 I3 R2 R3 Q13 Q2 V+ DESD1 IN DESD2 GND D1 D2 RIN 225 Q3 R1 + D3 D4 Q1 Q4 RG 450 Figure 1. LT6551 Simplified Schematic 65501f U the maximum input is (3V - 1.75V) or 1.25V, and the internal gain of two will set the output voltage to 2.5V. Increasing the input beyond 1.25V will force the device out of its linear range, no longer a gain of 2, and the output will not increase beyond 2.5V. At a higher supply voltage, i.e. 5V, the maximum input voltage is 5V - 1.75V or 3.25V. However, due to the internal gain of 2, the output will clip with a lower input voltage. For linear unclipped operation the minimum input voltage is (VOUT Min)/2 and the maximum input voltage is (VOUT Max)/2 or (VCC - 1.75V), whichever is less. ESD The LT6550/LT6551 have reverse-biased ESD protection diodes on all inputs and outputs as shown in Figure 1. If these pins are forced beyond either supply, unlimited current will flow through these diodes. If the current is limited to 10mA or less, no damage to the device will occur. V+ Q5 Q7 Q9 Q10 CM V+ DESD3 Q6 Q8 W U U - COMPLEMENTARY DRIVE GENERATOR OUT DESD4 Q11 Q12 GND Q14 I4 R4 R5 GND 6551 F01 11 LT6550/LT6551 APPLICATIO S I FOR ATIO Power Dissipation The LT6550/LT6551, enhanced JA MS package, has Pin 5 (VEE for the LT6550 and GND for the LT6551) fused to the lead frame. This thermal connection increases the efficiency of the PC board as a heat sink. The PCB material can be very effective at transmitting heat between the pad area attached to Pin 5 and a ground or power plane layer. Copper board stiffeners and plated through holes can also be used to spread the heat generated by the device. Table 1 lists the thermal resistance for several different board sizes and copper areas. All measurements were taken on 3/32" FR-4 board with 2oz copper. This data can be used as a rough guideline in estimating thermal resistance. The thermal resistance for each application will be affected by thermal interactions with other components as well as board size and shape. Table 1. Fused 10-Lead MSOP Package COPPER AREA TOPSIDE* (mm2) 540 100 100 30 0 BACKSIDE (mm2) 540 100 0 0 0 BOARD AREA (mm2) 2500 2500 2500 2500 2500 THERMAL RESISTANCE (JUNTION-TO-AMBIENT) 110C/W 120C/W 130C/W 135C/W 140C/W *Device is mounted on topside. As an example, calculate the junction temperature for the circuit in Figure 2 assuming an 85C ambient temperature. The device dissipation can be found by measuring the supply current, calculating the total dissipation and then subtracting the dissipation in the load. 12 U The dissipation for the amplifiers is: PD = (106mA)(5V) - 4 * (2.5V)2/150 = 363mW The total package power dissipation is 363mW. When a 2500 sq mm PC board with 540 sq mm of 2oz copper on top and bottom is used, the thermal resistance is 110C/W. The junction temperature (TJ) is: TJ = (363mW)(110C/W) + 85C = 125C The maximum junction temperature for the LT6551 is 150C so the heat sinking capability of the board is adequate for the application. LT6551 450 450 5V - OA + 450 1.25V - OA + 450 450 75 - OA + 450 450 75 - OA + GND 75 6551 F02 W U U 75 75 450 75 75 75 Figure 2. Calculating Junction Temperature 65501f LT6550/LT6551 TYPICAL APPLICATIO U S Video Splitter 470F LUMINANCE 75 1k 4k 1 LT6551 450 450 10 - OA + 2 450 450 VCC = 5V LUMINANCE OUT2 9 75 VCC = 5V 470F CHROMA 75 1k 4k 3 450 450 - OA + 8 75 LUMINANCE OUT1 S-VIDEO CONNECTOR CHROMA OUT1 7 75 - OA + 4 450 450 OUT1 5 - OA + 6 75 6551 TA02 S-VIDEO CHROMA CONNECTOR OUT2 OUT2 65501f 13 LT6550/LT6551 TYPICAL APPLICATIO Consumer products require generation of YPBPR luminance/chrominance component signals, often from RGB source content. The YPBPR format has a luminance signal and two weighted color difference signals at baseband. Even with their fixed internal gain resistors, two LT6550s connected as shown easily implement the required conversion matrix equations. The Y channel is a weighted average of the 2X amplified RGB signals and with the feedback connection of the Y channel output in the second LT6550 back to the gain-resistor common pin, an implicit Y subtraction is performed for the chroma channels and LT6550 450 R 75 1 450 G 75 2 450 B 75 3 4 14 U the desired unity gain is produced for the Y-channel. The necessary scaling of the color-difference signals is performed passively by their respective output termination resistor networks. Since this circuit naturally produces bipolar chroma signals (0.35V at the cable load) regardless of RGB offset, the simplest implementation is to power the circuit with 3.3V split supplies. With an available output swing of about 5.6V for this supply configuration, the circuit handles video with composite syncs and/ or various offsets without difficulty. RGB to YPBPR Component-Video Conversion 3.3V 10 450 9 1070 LT6550 450 3.3V 10 450 105 261 450 8 549 2 450 7 2940 3 5 -3.3V Y = 0.299R + 0.587G + 0.114B PB = 0.565(B - Y) PR = 0.713(R - Y) f3dB 44MHz 4 450 450 75 Y - + - 1 + 9 PR - + 450 - + 450 133 PB 174 5 -3.3V 6550/51 TAO3 8 - + - + 7 65501f LT6550/LT6551 PACKAGE DESCRIPTIO U MS Package 10-Lead Plastic MSOP (Reference LTC DWG # 05-08-1661) 0.889 0.127 (.035 .005) 3.2 - 3.45 (.126 - .136) 3.00 0.102 (.118 .004) (NOTE 3) 10 9 8 7 6 0.497 0.076 (.0196 .003) REF DETAIL "A" 0 - 6 TYP 12345 0.53 0.01 (.021 .006) DETAIL "A" 0.18 (.007) SEATING PLANE 0.17 - 0.27 (.007 - .011) TYP 0.13 0.076 (.005 .003) MSOP (MS) 0802 5.23 (.206) MIN 0.50 0.305 0.038 (.0197) (.0120 .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) GAUGE PLANE 4.90 0.15 (1.93 .006) 3.00 0.102 (.118 .004) NOTE 4 1.10 (.043) MAX 0.86 (.034) REF NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 0.50 (.0197) BSC 65501f Information 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 15 LT6550/LT6551 TYPICAL APPLICATIO 10MHz LABORATORY FREQUENCY REFERENCE (4dBm MAX) 50 RELATED PARTS PART NUMBER LT1259/LT1260 LT1395/LT1396/LT1397 LT1398/LT1399 LT1675/LT1675-1 LT1809/LT1810 DESCRIPTION Dual/Triple 130MHz Current Feedback Amplifiers Single, Dual, Quad 400MHz Current Feedback Amplifier Dual/Triple 300MHz Current Feedback Amplifier 250MHz, Triple and Single RGB Multiplexer with Current Feedback Amplifiers Single/Dual, 180MHz, Rail-to-Rail Input and Output Amplifiers COMMENTS Shutdown, Operates to 15V 800V/s Slew Rate 0.1dB Gain Flatness to 150MHz, Shutdown 100MHz Pixel Switching, -3dB Bandwidth: 250MHz, 1100V/s Slew Rate 350V/s Slew Rate, Shutdown, Low Distortion -90dBc at 5MHz 16 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 q FAX: (408) 434-0507 q U 10MHz Reference Distribution Amplifier LT6551 450 4.53k 10nF 1 450 - + OA 450 10 9 50 10nF VCC = 3.3V 1k 450 - 2 450 + OA 8 50 10nF 450 - 3 450 + OA 7 50 10nF 450 - 4 5 + OA 7 50 10nF 6550/51 TA04 65501f LT/TP 0303 2K * PRINTED IN USA www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2002 |
Price & Availability of LT6550 |
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
[Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |