LT6205IS5

LT6205/LT6206/LT6207 Single/Dual/Quad Single Supply 3V, 100MHz Video Op Amps DESCRIPTIO The LT®6205/LT6206/LT6207 are low cost single/dual/ quad voltage feedback amplifiers that feature 100MHz gain-bandwidth product, 450V/µs slew rate and 50mA output current. These amplifiers have an input range that includes ground and an output that swings within 60mV of either supply rail, making them well suited for single supply operation. These amplifiers maintain their performance for supplies from 2.7V to 12.6V and are specified at 3V, 5V and ±5V. The inputs can be driven beyond the supplies without damage or phase reversal of the output. Isolation between channels is high, over 90dB at 10MHz. The LT6205 is available in the 5-pin SOT-23, and the LT6206 is available in an 8-lead MSOP package with standard op amp pin-outs. For compact layouts the quad LT6207 is available in the 16-pin SSOP package. These devices are specified over the commercial and industrial temperature ranges. , LTC and LT are registered trademarks of Linear Technology Corporation. FEATURES s s s s s s s s s s s s 450V/µs Slew Rate 100MHz Gain Bandwidth Product Wide Supply Range 2.7V to 12.6V Output Swings Rail-to-Rail Input Common Mode Range Includes Ground High Output Drive: 50mA Channel Separation: 90dB at 10MHz Specified on 3V, 5V, and ±5V Supplies Input Offset Voltage: 1mV Low Power Dissipation: 20mW Per Amplifier on Single 5V Operating Temperature Range: –40°C to 85°C Single in SOT-23, Dual in MSOP, Quad in SSOP Package APPLICATIO S s s s s s Video Line Driver Automotive Displays RGB Amplifiers Coaxial Cable Drivers Low Voltage High Speed Signal Processing TYPICAL APPLICATIO 3.3V Baseband Video Splitter/Cable Driver 499Ω 499Ω 8 1µF 75Ω VOUT1 VOUT 75Ω LT6206 2 0V – + 1 VIN 75Ω 3 VIN 0V 7 75Ω VOUT2 75Ω 4 F3dB ≈ 50MHz IS ≤ 25mA 620567 TA01a 5 + – 499Ω 6 VS = 3.3V VIN = 0.1V TO 1.1V f = 10MHz 499Ω U U U Output Step Response 20ns/DIV 620567 TA01b 620567f 1 LT6205/LT6206/LT6207 ABSOLUTE (Note 1) AXI U RATI GS Operating Temperature Range .................–40°C to 85°C Specified Temperature Range (Note 4) ....–40°C to 85°C Storage Temperature Range ..................–65°C to 150°C Maximum Junction Temperature .......................... 150°C Lead Temperature (Soldering, 10 sec).................. 300°C Total Supply Voltage (V + to V –) ............................ 12.6V Input Current ...................................................... ±10mA Input Voltage Range (Note 2) ................................... ±VS Output Short-Circuit Duration (Note 3) ............ Indefinite Pin Current While Exceeding Supplies (Note 9) .. ±25mA PACKAGE/ORDER I FOR ATIO TOP VIEW OUT 1 V– 2 – + 5 V+ +IN 3 4 –IN OUT A –IN A +IN A V– 1 2 3 4 S5 PACKAGE 5-LEAD PLASTIC SOT-23 TJMAX = 150°C, θJA = 250°C/W MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 250°C/W ORDER PART NUMBER LT6205CS5 LT6205IS5 S5 PART MARKING* LTAEM ORDER PART NUMBER LT6206CMS8 LT6206IMS8 *The temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. The q denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = 1V, unless otherwise noted. SYMBOL VOS PARAMETER Input Offset Voltage q ELECTRICAL CHARACTERISTICS CONDITIONS Input Offset Voltage Match (Channel-to-Channel) (Note 5) Input Offset Voltage Drift (Note 6) IB IOS en in Input Bias Current Input Offset Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance 0.1Hz to 10Hz f = 10kHz f = 10kHz VCM = 0V to V+ – 2V 2 U U W WW U W TOP VIEW OUT A 1 –IN A 2 – + 16 OUT D A D – + 15 –IN D 14 +IN D 13 V – TOP VIEW – + – + 8 7 6 5 V+ OUT B –IN B +IN B +IN A 3 V+ 4 +IN B 5 –IN B 6 OUT B 7 NC 8 + – B C + – 12 +IN C 11 –IN C 10 OUT C 9 NC GN PACKAGE 16-LEAD NARROW PLASTIC SSOP TJMAX = 150°C, θJA = 135°C/W MS8 PART MARKING LTH3 LTH4 ORDER PART NUMBER LT6207CGN LT6207IGN GN PART MARKING 6207 6207I MIN TYP 1 1 MAX 3.5 5 3 4 15 30 3 UNITS mV mV mV mV µV/°C µA µA µVP-P nV/√Hz pA/√Hz MΩ pF 620567f q q q q 7 10 0.6 2 9 4 1 2 LT6205/LT6206/LT6207 The q denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = 1V, unless otherwise noted. SYMBOL CMRR PSRR PARAMETER Common Mode Rejection Ratio Input Voltage Range Power Supply Rejection Ratio Minimum Supply Voltage AVOL Large-Signal Voltage Gain VS = 3V to 12V VCM = VOUT = 0.5V VCM = 0.5V VS = 5V, VO = 0.5V to 4.5V, RL = 1k VS = 5V, VO = 1V to 3V, RL = 150Ω VS = 3V, VO = 0.5V to 2.5V, RL = 1k No Load, Input Overdrive = 30mV ISINK = 5mA VS = 5V, ISINK = 25mA VS = 3V, ISINK = 15mA No Load, Input Overdrive = 30mV ISOURCE = 5mA VS = 5V, ISOURCE = 25mA VS = 3V, ISOURCE = 15mA VS = 5V, Output Shorted to GND q ELECTRICAL CHARACTERISTICS CONDITIONS VCM = 0 to V+ – 2V q q q q q q q q q q q q q q q MIN 78 0 67 TYP 90 MAX V+ – 2 UNITS dB V dB 75 2.7 V V/mV V/mV V/mV 30 5 20 100 20 60 10 75 300 200 60 140 650 300 25 150 500 350 100 250 1200 500 VOL Output Voltage Swing Low (Note 7) mV mV mV mV mV mV mV mV mA mA mA mA VOH Output Voltage Swing High (Note 7) ISC Short-Circuit Current 35 25 30 20 60 50 3.75 5 5.75 VS = 3V, Output Shorted to GND q IS GBW SR Supply Current per Amplifier q mA mA MHz V/µs dB MHz ns ns % Deg Gain Bandwidth Product Slew Rate Channel Separation f = 2MHz VS = 5V, AV = 2, RF = RG = 1k VO = 1V to 4V, Measured from 1.5V to 3.5V f = 10MHz VOUT = 2VP-P (Note 8) VS = 5V, ∆VOUT = 2V, AV = –1, RL = 150Ω VS = 5V, AV = 2, RL = 150Ω, Output Black Level =1V VS = 5V, AV = 2, RL = 150Ω, Output Black Level =1V q 65 100 450 90 71 15 25 0.05 0.08 FPBW tS Full Power Bandwidth Settling time to 3% Settling time to 1% Differential Gain Differential Phase The q denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C. VS = ± 5V; VCM = VOUT = 0V, unless otherwise noted. SYMBOL VOS PARAMETER Input Offset Voltage q CONDITIONS MIN TYP 1.3 1 MAX 4.5 6 3 4 18 30 3 UNITS mV mV mV mV µV/°C µA µA µVP-P 620567f Input Offset Voltage Match (Channel-to-Channel) (Note 5) Input Offset Voltage Drift (Note 6) IB IOS Input Bias Current Input Offset Current Input Noise Voltage 0.1Hz to 10Hz q q q q 10 18 0.6 2 3 LT6205/LT6206/LT6207 ELECTRICAL CHARACTERISTICS SYMBOL en in PARAMETER Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance CMRR PSRR AVOL Common Mode Rejection Ratio Input Voltage Range Power Supply Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing VS = ±2V to ±6V VO = – 4V to 4V, RL = 1k VO = – 3V to 3V, RL = 150Ω No Load, Input Overdrive = 30mV IOUT = ±5mA IOUT = ±25mA Short to Ground q The q denotes specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C. VS = ± 5V; VCM = VOUT = 0V, unless otherwise noted. CONDITIONS f = 10kHz f = 10kHz VCM = –5V to 3V VCM = –5V to 3V q q q q q q q q MIN TYP 9 4 1 2 MAX UNITS nV/√Hz pA/√Hz MΩ pF dB 78 –5 67 50 7.5 ±4.88 ±4.75 ±3.8 ±40 ±30 90 3 75 133 20 ±4.92 ±4.85 ±4.35 ±60 4 5.6 6.5 V dB V/mV V/mV V V V mA mA mA mA MHz V/µs dB MHz ns ns % Deg ISC IS GBW SR Short-Circuit Current Supply Current per Amplifier q Gain Bandwidth Product Slew Rate Channel Separation f = 2MHz AV = – 1, RL = 1k VO = – 4V to 4V, Measured from –3V to 3V f = 10MHz VOUT = 8VP-P (Note 8) ∆VOUT = 2V, AV = –1, RL = 150Ω AV = 2, RL = 150Ω, Output Black Level = 1V AV = 2, RL = 150Ω, Output Black Level = 1V q 65 350 100 600 90 FPBW tS Full Power Bandwidth Settling Time to 3% Settling Time to 1% Differential Gain Differential Phase 14 24 15 25 0.05 0.08 Note 1: Absolute Maximum ratings are those values beyond which the life of a device may be impaired. Note 2: The inputs are protected by back-to-back diodes. If the differential input voltage exceeds 1.4V, the input current should be limited to less than 10mA. Note 3: 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 4: The LT6205C/LT6206C/LT6207C are guaranteed to meet specified performance from 0°C to 70°C and are designed, characterized and expected to meet specified performance from –40°C to 85°C but are not tested or QA sampled at these temperatures. The LT6205I/LT6206I/ LT6207I are guaranteed to meet specified performance from –40°C to 85°C. Note 5: Matching parameters are the difference between the two amplifiers A and D and between B and C of the LT6207; between the two amplifiers of the LT6206. Note 6: This parameter is not 100% tested. Note 7: Output voltage swings are measured between the output and power supply rails. Note 8: Full power bandwidth is calculated from the slew rate measurement: FPBW = SR/2πVPEAK. Note 9: There are reverse biased ESD diodes on all inputs and outputs. If these pins are forced beyond either supply, unlimited current will flow through these diodes. If the current is transient in nature and limited to less than 25mA, no damage to the device will occur. 620567f 4 LT6205/LT6206/LT6207 TYPICAL PERFOR A CE CHARACTERISTICS VOS Distribution 40 35 SUPPLY CURRENT PER AMPLIFIER (mA) VS = 5V, 0V VCM = 1V 5 TA = 125°C 4 TA = 25°C 3 TA = –55°C CHANGE IN INPUT OFFSET VOLTAGE (µV) PERCENT OF UNITS (%) 30 25 20 15 10 5 0 –3 –2 –1 0 1 2 INPUT OFFSET VOLTAGE (mV) 3 620567 G01 Change in Offset Voltage vs Input Common Mode Voltage 1000 OFFSET VOLTAGE CHANGE (µV) VS = 5V, 0V INPUT BIAS CURRENT (µA) INPUT BIAS CURRENT (µA) 800 600 400 TA = 25°C 200 TA =125°C TA = –55°C 0 1 2 3 4 INPUT COMMON MODE VOLTAGE (V) 5 0 Output Saturation Voltage vs Load Current (Output Low) 10 OUTPUT SHORT-CIRCUIT CURRENT (mA) OUTPUT SATURATION VOLTAGE (V) OUTPUT SATURATION VOLTAGE (V) VS = 5V, 0V VOD = 30mV TA = 125°C 1 TA = 25°C 0.1 0.01 0.01 0.1 1 10 LOAD CURRENT (mA) UW TA = –55°C Supply Current per Amplifier vs Supply Voltage 100 0 –100 –200 –300 –400 –500 Minimum Supply Voltage TA = –55°C TA =125°C TA = 25°C 2 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V) 620567 G02 –600 1.5 2.0 2.5 3.0 3.5 4.0 4.5 TOTAL SUPPLY VOLTAGE (V) 5.0 620567 G03 Input Bias Current vs Input Common Mode Voltage –2 –3 –4 –5 –6 –7 –8 –9 –10 –11 –12 0 1 2 3 4 INPUT COMMON MODE VOLTAGE (V) 5 TA = –55°C TA = 25°C TA = 125°C VS = 5V, 0V –4 –5 –6 –7 –8 –9 –10 –11 Input Bias Current vs Temperature VS = 5V, 0V VCM = 1V –12 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 125 620567 G04 620567 G05 620567 G06 Output Saturation Voltage vs Load Current (Output High) 10 Short-Circuit Current vs Temperature 75 70 65 60 55 SOURCING 50 45 40 35 –50 –25 VS = 3V, 0V VCM = 1V SINKING SOURCING VS = 5V, 0V VCM = 1V SINKING VS = 5V, 0V VOD = 30mV TA = 125°C 1 TA = 25°C 0.1 TA = –55°C 100 620567 G07 0.01 0.01 0.1 1 10 LOAD CURRENT (mA) 100 620567 G08 0 25 50 75 TEMPERATURE (°C) 100 125 620567 G09 620567f 5 LT6205/LT6206/LT6207 TYPICAL PERFOR A CE CHARACTERISTICS Short-Circuit Current vs Temperature 90 OUTPUT SHORT-CIRCUIT CURRENT (mA) 80 VS = ±5V 500 400 300 SINKING 70 60 50 40 3O –50 SOURCING INPUT VOLTAGE (µV) 200 100 0 –100 –200 –300 –400 –500 RL = 1k RL = 150Ω INPUT VOLTAGE (µV) –25 0 25 50 75 TEMPERATURE (°C) Warm Up Drift vs Time (LT6206) 120 CHANGE IN OFFSET VOLTAGE (µV) 100 80 VS = 5V, 0V 60 40 20 0 0 10 20 30 40 50 60 70 80 90 100 TIME AFTER POWER-UP (s) 620567 G13 INPUT NOISE CURRENT DENSITY (pA/√Hz) INPUT NOISE VOLTAGE DENSITY (nV/√Hz) VS = ±5V 0.1Hz to 10Hz Noise Voltage VS = 5V, 0V VCM = 1V TA = 25°C NOISE VOLTAGE (1µV/DIV) 70 60 50 40 VS = 3V, 0V VS = ±5V GAIN BANDWIDTH (MHz) GAIN (dB) TIME (2 SEC/DIV) 620567 G16 6 UW 100 620567 G10 Open-Loop Gain VS = 5V, 0V VCM = 1V TA = 25°C 500 400 300 200 100 0 –100 –200 –300 –400 –500 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT VOLTAGE (V) 620567 G11 Open-Loop Gain VS = ±5V TA = 25°C RL = 1k RL = 150Ω 125 –5 –4 –3 –2 –1 0 1 2 3 OUTPUT VOLTAGE (V) 4 5 620567 G12 Input Noise Voltage Density vs Frequency 30 25 20 15 10 5 0 100 VS = 5V, 0V VCM = 1V TA = 25°C 16 14 12 10 8 6 4 2 Input Noise Current Density vs Frequency VS = 5V, 0V VCM = 1V TA = 25°C TA = 25°C 1k 10k FREQUENCY (Hz) 100k 620567 G14 0 100 1k 10k FREQUENCY (Hz) 100k 620567 G15 Gain and Phase vs Frequency 140 PHASE 120 100 80 60 40 20 TA = 25°C RL = 1k CL = 5pF 1M VS = 3V, 0V GAIN VS = ±5V 100M 0 -20 -40 500M Gain Bandwidth and Phase Margin vs Supply Voltage TA = 25°C RF = RG = 1k CL = 5pF PHASE MARGIN 40 110 GAIN BANDWIDTH 105 100 95 0 2 4 6 8 10 TOTAL SUPPLY VOLTAGE (V) 12 35 50 45 PHASE MARGIN (DEG) PHASE (DEG) 30 20 10 0 –10 –20 100k 10M FREQUENCY (Hz) 620567 G17 620567 G18 620567f LT6205/LT6206/LT6207 TYPICAL PERFOR A CE CHARACTERISTICS Gain Bandwidth and Phase Margin vs Temperature RL = 1k CL = 5pF GAIN BANDWIDTH (MHz) 55 VS = ±5V 50 45 PHASE MARGIN (DEG) 750 700 650 RISING VS = ±5V FALLING VS = ±5V SLEW RATE (V/µs) PHASE MARGIN VS = 3V, 0V 120 110 100 90 80 –50 –25 VS = 3V, 0V GAIN BANDWIDTH 0 25 50 75 TEMPERATURE (°C) 100 VS = ±5V SLEW RATE (V/µs) Closed-Loop Gain vs Frequency 15 TA = 25°C 12 CL = 5pF A = +1 9V 6 GAIN (dB) POWER SUPPLY REJECTION RATIO (dB) OUTPUT IMPEDANCE (Ω) 3 0 –3 –6 –9 –12 –15 100k 1M 10M FREQUENCY (Hz) 100M 500M VS = 3V VCM = 1V Common Mode Rejection Ratio vs Frequency 100 COMMON MODE REJECTION RATIO (dB) 90 80 VOLTAGE GAIN (dB) 60 50 40 30 20 10 0 10k 100k 1M 10M FREQUENCY (Hz) 100M 1G 90 80 70 60 50 40 1M 10M FREQUENCY (Hz) 100M 620567 G26 OVERSHOOT (%) 70 UW 620567 G19 Slew Rate vs Temperature AV = –1 RG = RF = 1k RL = 1k 750 700 650 600 550 Slew Rate vs Closed-Loop Gain VS = ±5V VO = –4V to 4V RL = 1k TA = 25°C RISING 40 35 600 550 500 450 400 350 –50 RISING VS = 5V, 0V FALLING 500 450 400 FALLING VS = 5V, 0V 125 –25 0 25 50 75 TEMPERATURE (°C) 100 125 2 3 GAIN (AV) 4 5 620567 G21 620567 G20 Output Impedance vs Frequency 1000 VS = 5V, 0V TA = 25°C 90 80 70 60 50 40 30 20 10 Power Supply Rejection Ratio vs Frequency VS = 5V, 0V TA = 25°C VS = ±5V VCM = 0V 100 AV = 10 10 AV = 2 AV = 1 +PSRR –PSRR 1 0.1 100k 1M 10M FREQUENCY (Hz) 100M 500M 0 10k 100k 1M 10M FREQUENCY (Hz) 100M 620567 G24 620567 G22 620567 G23 Channel Separation vs Frequency 120 VS = ±5V LT6206 CH A-B 110 LT6207 CH A-D, CH B-C T = 25°C 100 A 40 35 30 25 20 15 10 5 0 Series Output Resistor vs Capacitive Load VS = 5V, 0V AV = 1 TA = 25°C RS = 10Ω, RL = ∞ VS = ±5V TA = 25°C RS = 20Ω, RL = ∞ RL = RS = 50Ω 10 100 CAPACITIVE LOAD (pF) 1000 620567 G27 620567 G25 620567f 7 LT6205/LT6206/LT6207 TYPICAL PERFOR A CE CHARACTERISTICS Series Output Resistor vs Capacitive Load 40 35 30 OVERSHOOT (%) 25 20 15 10 5 0 10 100 CAPACITIVE LOAD (pF) 1000 620567 G28 OUTPUT VOLTAGE SWING (VP–P) VS = 5V, 0V AV = 2 TA = 25°C RS = 10Ω, RL = ∞ 6 5 4 3 2 1 VS = ±5V TA = 25°C HD2, HD3 < –30dBc 1 10 FREQUENCY (MHz) 100 620567 G30 DISTORTION (dB) RS = 20Ω, RL = ∞ RL = RS = 50Ω Distortion vs Frequency –30 –40 –50 –60 –70 –80 –90 RL = 1k, 3RD –100 0.01 0.1 1 FREQUENCY (MHz) 10 620567 G32 AV = +2 VO = 2VP–P VS = 5V, 0V RL = 1k, 2ND DISTORTION (dB) DISTORTION (dB) RL = 150Ω, 2ND RL = 150Ω, 3RD –60 RL = 150Ω, 2ND –70 –80 –90 –100 0.01 RL = 1k, 2ND RL = 1k, 3RD 0.1 1 FREQUENCY (MHz) 10 620567 G33 DISTORTION (dB) Large Signal Response VS = 5V, 0V 500mV/DIV 50mV/DIV 0V VS = 5V, 0V AV = 1 RL = 150Ω 50ns/DIV 620567 G35 8 UW Maximum Undistorted Output Signal vs Frequency 10 9 8 7 AV = 2 AV = –1 –30 –40 –50 –60 Distortion vs Frequency AV = +1 VO = 2VP–P VS = 5V, 0V RL = 1k, 2ND RL = 150Ω, 3RD –70 –80 –90 RL = 1k, 3RD –100 0.01 0.1 1 FREQUENCY (MHz) 10 620567 G31 RL = 150Ω, 2ND 0 0.1 Distortion vs Frequency –30 –40 –50 AV = +1 VO = 2VP–P VS = ±5V –30 –40 RL = 150Ω, 3RD –50 –60 –70 –80 –90 Distortion vs Frequency AV = +2 VO = 2VP–P VS = ±5V RL = 150Ω, 3RD RL = 150Ω, 2ND RL = 1k, 2ND –100 0.01 RL = 1k, 3RD 10 620567 G34 0.1 1 FREQUENCY (MHz) Small Signal Response VS = 5V, 0V 2.5V VS = 5V, 0V AV = 1 RL = 150Ω 50ns/DIV 620567 G36 620567f LT6205/LT6206/LT6207 TYPICAL PERFOR A CE CHARACTERISTICS Large Signal Response VS = ±5V Small Signal Response VS = ±5V VIN (1V/DIV) 0V VOUT (2V/DIV) 0V 0V VS = 5V, 0V AV = 2 100ns/DIV 620567 G39 0V VS = ±5V AV = 1 RL = 150Ω 50mV/DIV 1V/DIV 50ns/DIV 620567 G37 APPLICATIO S I FOR ATIO I1 Q2 V+ DESD1 +IN DESD2 V– V+ DESD3 –IN DESD4 V– RIN 150Ω D2 D4 D1 D3 RIN 150Ω Q1 Q3 R1 Q4 Figure 1. Simplified Schematic U W UW Output-Overdrive Recovery VS = ±5V AV = 1 RL = 150Ω 50ns/DIV 620567 G38 UU V+ I2 I3 R2 R3 Q13 Q9 Q5 Q7 Q10 CM DESD5 V+ Q6 Q8 Q11 Q12 COMPLEMENTARY DRIVE GENERATOR OUT DESD6 V– Q14 I4 R4 R5 V– 620567 F01 620567f 9 LT6205/LT6206/LT6207 APPLICATIO S I FOR ATIO Amplifier Characteristics Figure 1 shows a simplified schematic of the LT6205/ LT6206/LT6207. The input stage consists of transistors Q1 to Q8 and resistor R1. This topology allows for high slew rates at low supply voltages. The input common mode range extends from ground to typically 1.75V from VCC, and is limited by 2 VBEs plus a saturation voltage of a current source. There are back-to-back series diodes, D1 to D4, across the + and – inputs of each amplifier to limit the differential 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, which 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. The current generated through R1, divided by the capacitor CM, determines the slew rate. Note that this current, and hence the slew rate, are proportional to the magnitude of the input step. The input step equals the output step divided by the closed loop gain. The highest slew rates are therefore obtained in the lowest gain configurations. The Typical Performance Characteristic Curve of Slew Rate vs Closed Loop Gain shows the details. ESD The LT6205/LT6206/LT6207 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 transient, and limited to 25mA or less, no damage to the device will occur. Layout and Passive Components With a gain bandwidth product of 100MHz and a slew rate of 450V/µs the LT6205/LT6206/LT6207 require special attention to board layout and supply bypassing. Use a ground plane, short lead lengths and RF-quality low ESR supply bypass capacitors. The positive supply pin should be bypassed with a small capacitor (typically 0.01µF to 0.1µF) within 0.25 inches of the pin. When driving heavy loads, an additional 4.7µF electrolytic capacitor should be used. When using split supplies, the same is true for the 10 U negative supply pin. For optimum performance all feedback components and bypass capacitors should be contained in a 0.5 inch by 0.5 inch area. This helps ensure minimal stray capacitances. The parallel combination of the feedback resistor and gain setting resistor on the inverting input can combine with the input capacitance to form a pole which can degrade stability. In general, use feedback resistors of 1k or less. Capacitive Load The LT6205/LT6206/LT6207 are optimized for wide bandwidth video applications. They can drive a capacitive load of 20pF in a unity-gain configuration. When driving a larger capacitive load, a resistor of 10Ω to 50Ω should be connected between the output and the capacitive load to avoid ringing or oscillation. The feedback should still be taken from the output pin so that the resistor will isolate the capacitive load and ensure stability. The Typical Performance Curves show the output overshoot when driving a capacitive load with different series resistors. Video Signal Characteristics Composite video is the most commonly used signal in broadcast-grade products and includes Luma (or luminance, the intensity information), Chroma (the colorimetry information) and Sync (vertical and horizontal raster timing) elements combined into a single signal, NTSC and PAL being the common formats. Component video for entertainment systems include separate signal(s) for the Luma and Chroma (i.e. Y/C or YPbPr) with Sync generally applied to the Luma channel (Y signal). In some instances, native RGB signals (separate intensity information for each primary color: red, green, blue) will have Sync included as well. All the signal types that include Sync are electrically similar from a voltage-swing standpoint, though various timing and bandwidth relationships exist depending on the applicable standard. The typical video waveforms that include Sync (including full composite) are specified to have nominal 1VP-P amplitude. The lower 0.3V is reserved for “sync tips” that carry timing information, and by being at a lower potential than all the other information, represents blacker-than-black intensity, thereby causing scan retrace activity to be 620567f W UU LT6205/LT6206/LT6207 APPLICATIO S I FOR ATIO invisible on a CRT. The “black” level of the waveform is at (or “setup” very slightly above) the upper limit of the sync information. Waveform content above the black-level is intensity information, with peak brightness represented at the maximum signal level. In the case of composite video, the modulated color subcarrier is superimposed on the waveform, but the dynamics remain inside the 1VP-P limit (a notable exception is the chroma ramp used for differential-gain and differential-phase measurements, which can reach 1.15VP-P). DC-Coupled Video Amplifier Considerations Typically video amplifiers drive cables that are series terminated (“back-terminated”) at the source and loadterminated at the destination with resistances equal to the cable characteristic impedance, Z0 (usually 75Ω). This configuration forms a 2:1 resistor divider in the cabling that must be accounted for in the driver amplifier by delivering 2VP-P output into an effective 2 • Z0 load (e.g. 150Ω). Driving the cable can require more than 13mA while the output is approaching the saturation-limits of the amplifier output. The absolute minimum supply is: VMIN = 2 + VOH +VOL. For example, the LT6206 dual operating on 3.3V as shown on the front page of this datasheet, with exceptionally low VOH ≤ 0.5V and VOL ≤ 0.35V, provides a design margin of 0.45V. The design margin must be large enough to include supply variations and DC bias accuracy for the DC-coupled video input. Handling AC-Coupled Video Signals AC-coupled video inputs are intrinsically more difficult to handle than those with DC-coupling because the average signal voltage of the video waveform is effected by the picture content, meaning that the black-level at the amplifier “wanders” with scene brightness. The wander is measured as 0.56V for a 1VP-P NTSC waveform changing from black-field to white-field and vice-versa, so an additional 1.12V allowance must be made in the amplifier supply (assuming gain of 2, so VMIN = 3.12 + VOH +VOL). For example, an LT6205 operating on 5V has a conserva- U tive design margin of 1.03V. The amplifier output (for gain of 2) must swing +1.47V to –1.65V around the DCoperating point, so the biasing circuitry needs to be designed accordingly for optimal fidelity. Clamped AC-Input Cable Driver A popular method of further minimizing supply requirements with AC-coupling is to employ a simple clamping scheme as shown in Figure 2. In this circuit, the LT6205 operates from 3.3V by having the sync-tips control the charge on the coupling capacitor C1, thereby reducing the black-level input wander to ≈ 0.07V. The only minor drawback to this circuit is the slight sync-tip compression (≈ 0.025V at input) due to the diode conduction current, though the picture content remains full fidelity. This circuit has nearly the design margin of its DC-coupled counterpart, at 0.31V (for this circuit, VMIN = 2.14 + VOH +VOL). The clamp-diode anode bias is selected to set the sync-tip output voltage at or slightly above VOL. YPbPr to RGB Component-Video Converter The back-page application uses the LT6207 quad to implement a minimum amplifier count topology to transcode consumer component-video into RGB. In this circuit, signals only pass through one active stage from any input to any output, with passive additions being performed by the cable back-termination resistors. The compromise in using passive output addition is that the amplifier outputs must be twice as large as that of a conventional cable driver. The Y-channel section also has the demanding requirement that it single-handedly drives all three outputs to full brightness during times of white content, so a helper current source is used to assure unclipped video when operating from ±5V supplies. This circuit maps sync-on-Y to sync on all the RGB channels, and for best results should have input black-levels at 0V nominal to prevent clipping. 620567f W UU 11 LT6205/LT6206/LT6207 TYPICAL APPLICATIO U 3.3V 1k 1k 2.4k 0.1µF 75Ω VIDEO OUT 75Ω 5 LT6205 3 1 4 C1 4.7µF COMPOSITE VIDEO IN 1VP–P BAT54 10k C2 4.7µF 470Ω IS ≤ 19mA 620567 TA02 – + 2 Figure 2. Clamped AC-Input Video Cable Driver 620567f 12 LT6205/LT6206/LT6207 PACKAGE DESCRIPTIO U S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635) 0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 1.00 MAX DATUM ‘A’ 0.01 – 0.10 1.90 BSC S5 TSOT-23 0302 3.85 MAX 2.62 REF 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 620567f 13 LT6205/LT6206/LT6207 PACKAGE DESCRIPTIO U MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 ± 0.127 (.035 ± .005) 3.20 – 3.45 (.126 – .136) 5.23 (.206) MIN 0.42 ± 0.038 (.0165 ± .0015) TYP 0.65 (.0256) BSC 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 8 7 65 0.52 (.0205) REF RECOMMENDED SOLDER PAD LAYOUT DETAIL “A” 0° – 6° TYP 4.90 ± 0.152 (.193 ± .006) 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 0.254 (.010) GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 0.18 (.007) SEATING PLANE 1 1.10 (.043) MAX 23 4 0.86 (.034) REF 0.65 (.0256) NOTE: BSC 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 0.22 – 0.38 (.009 – .015) TYP 0.127 ± 0.076 (.005 ± .003) MSOP (MS8) 0603 620567f 14 LT6205/LT6206/LT6207 PACKAGE DESCRIPTIO U GN Package 16-Lead Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641) .045 ± .005 .189 – .196* (4.801 – 4.978) 16 15 14 13 12 11 10 9 .009 (0.229) REF .150 – .165 .229 – .244 (5.817 – 6.198) .0165 ± .0015 .150 – .157** (3.810 – 3.988) .0250 TYP 1 .015 ± .004 × 45° (0.38 ± 0.10) .007 – .0098 (0.178 – 0.249) .016 – .050 (0.406 – 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. 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 0° – 8° TYP .053 – .068 (1.351 – 1.727) 23 4 56 7 8 .004 – .0098 (0.102 – 0.249) .008 – .012 (0.203 – 0.305) .0250 (0.635) BSC GN16 (SSOP) 0502 .254 MIN RECOMMENDED SOLDER PAD LAYOUT 620567f 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 LT6205/LT6206/LT6207 TYPICAL APPLICATIO U YPBPR to RGB Converter CMPD6001S 5V 36Ω FMMT3906 4.7k 4 1µF 150Ω R 165Ω 499Ω 1 2 16 15 499Ω 150Ω Y 75Ω 5 3 B 107Ω 150Ω 75Ω 150Ω 75Ω – + LT6207 – + 14 + – 13 + – 12 80.6Ω 6 365Ω PB 95.3Ω 174Ω 499Ω 7 11 499Ω 10 150Ω 150Ω G 75Ω PR 133Ω F3dB ≈ 40MHz IS ≤ 60mA BLACK LEVELS ≈ 0V R = Y + 1.4 • PR B = Y + 1.8 • PB G = Y – 0.34 • PB – 0.71 • PR 1µF –5V 620567 TA03 RELATED PARTS PART NUMBER LT1253/LT1254 LT1675 LT1809/LT1810 LT6550/LT6551 LT6552 DESCRIPTION Low Cost Dual and Quad Video Amplifiers RGB Multiplexer with Current Feedback Amplifiers Single/Dual, 180MHz, Rail-to-Rail Input and Output Amplifiers 3.3V Triple and Quad Video Amplifiers 3.3V Single Supply Video Difference Amplifier COMMENTS –3dB Bandwidth = 90MHz, Current Feedback 0.1dB Flatness to 100MHz, 80mA Output Drive –3dB Bandwidth = 250MHz, 100MHz Pixel Switching 350V/µs Slew Rate, Shutdown, Low Distortion –90dBc at 5MHz Internal Gain of 2, 110MHz –3dB Bandwidth, Input Common Modes to Ground Differential or Single-Ended Gain Block, 600V/µs Slew Rate, Input Common Modes to Ground LT1395/LT1396/LT1397 Single Dual Quad 400MHz Current Feedback Amplifiers 620567f 16 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 q LT/TP 1003 1K • PRINTED IN USA FAX: (408) 434-0507 q www.linear.com © LINEAR TECHNOLOGY CORPORATION 2003