LT6205/LT6206/LT6207 Single/Dual/Quad Single Supply 3V, 100MHz Video Op Amps DESCRIPTIO U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 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 U APPLICATIO S ■ ■ ■ ■ Video Line Driver Automotive Displays RGB Amplifiers Coaxial Cable Drivers Low Voltage High Speed Signal Processing 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. U ■ 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. TYPICAL APPLICATIO Baseband Video Splitter/Cable Driver Output Step Response 3.3V 499Ω 1µF 499Ω VOUT 75Ω VOUT1 8 LT6206 2 VIN 3 – 0V 75Ω 1 + VIN 75Ω 5 0V + 7 6 VOUT2 – 75Ω 4 499Ω 75Ω 499Ω VS = 3.3V VIN = 0.1V TO 1.1V f = 10MHz 20ns/DIV 620567 TA01b F3dB ≈ 50MHz IS ≤ 25mA 620567 TA01a 620567f 1 LT6205/LT6206/LT6207 U W W W ABSOLUTE AXI U RATI GS (Note 1) 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 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 U W U PACKAGE/ORDER I FOR ATIO TOP VIEW OUT A 1 TOP VIEW 5 V+ OUT 1 V– TOP VIEW 2 + – +IN 3 4 –IN OUT A –IN A +IN A V– 1 2 3 4 8 7 6 5 – + – + V+ OUT B –IN B +IN B MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 250°C/W S5 PACKAGE 5-LEAD PLASTIC SOT-23 TJMAX = 150°C, θJA = 250°C/W 16 OUT D –IN A 2 – +IN A 3 + A D – 15 –IN D + 14 +IN D V+ 4 13 V – +IN B 5 + –IN B 6 – B C OUT B 7 + 12 +IN C – 11 –IN C 10 OUT C NC 8 9 NC GN PACKAGE 16-LEAD NARROW PLASTIC SSOP TJMAX = 150°C, θJA = 135°C/W ORDER PART NUMBER LT6205CS5 LT6205IS5 S5 PART MARKING* ORDER PART NUMBER MS8 PART MARKING ORDER PART NUMBER GN PART MARKING LTAEM LT6206CMS8 LT6206IMS8 LTH3 LTH4 LT6207CGN LT6207IGN 6207 6207I *The temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The ● 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 PARAMETER VOS Input Offset Voltage CONDITIONS MIN TYP MAX UNITS 1 3.5 5 mV mV 1 3 4 mV mV 7 15 µV/°C ● Input Offset Voltage Match (Channel-to-Channel) (Note 5) ● Input Offset Voltage Drift (Note 6) ● IB Input Bias Current ● 10 30 µA IOS Input Offset Current ● 0.6 3 µA Input Noise Voltage 0.1Hz to 10Hz 2 µVP-P en Input Noise Voltage Density f = 10kHz 9 nV/√Hz in Input Noise Current Density f = 10kHz 4 pA/√Hz Input Resistance VCM = 0V to V+ – 2V 1 MΩ 2 pF Input Capacitance 620567f 2 LT6205/LT6206/LT6207 ELECTRICAL CHARACTERISTICS The ● 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 PARAMETER Common Mode Rejection Ratio CONDITIONS VCM = 0 to V+ – 2V Input Voltage Range PSRR ● MIN TYP 78 90 MAX UNITS dB V+ – 2 ● 0 Power Supply Rejection Ratio VS = 3V to 12V VCM = VOUT = 0.5V ● 67 75 30 5 20 100 20 60 V dB Minimum Supply Voltage VCM = 0.5V ● AVOL Large-Signal Voltage Gain 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 ● ● ● VOL Output Voltage Swing Low (Note 7) No Load, Input Overdrive = 30mV ISINK = 5mA VS = 5V, ISINK = 25mA VS = 3V, ISINK = 15mA ● ● ● ● 10 75 300 200 25 150 500 350 mV mV mV mV VOH Output Voltage Swing High (Note 7) No Load, Input Overdrive = 30mV ISOURCE = 5mA VS = 5V, ISOURCE = 25mA VS = 3V, ISOURCE = 15mA ● ● ● ● 60 140 650 300 100 250 1200 500 mV mV mV mV ISC Short-Circuit Current VS = 5V, Output Shorted to GND 35 25 60 mA mA 30 20 50 ● mA mA Supply Current per Amplifier 3.75 ● GBW Gain Bandwidth Product f = 2MHz SR Slew Rate VS = 5V, AV = 2, RF = RG = 1k VO = 1V to 4V, Measured from 1.5V to 3.5V V V/mV V/mV V/mV ● VS = 3V, Output Shorted to GND IS 2.7 ● 65 5 5.75 mA mA 100 MHz 450 V/µs Channel Separation f = 10MHz 90 dB FPBW Full Power Bandwidth VOUT = 2VP-P (Note 8) 71 MHz tS Settling time to 3% Settling time to 1% VS = 5V, ∆VOUT = 2V, AV = –1, RL = 150Ω 15 25 ns ns Differential Gain Differential Phase VS = 5V, AV = 2, RL = 150Ω, Output Black Level =1V VS = 5V, AV = 2, RL = 150Ω, Output Black Level =1V 0.05 0.08 % Deg The ● 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 PARAMETER VOS Input Offset Voltage CONDITIONS MIN TYP MAX UNITS 1.3 4.5 6 mV mV 1 3 4 mV mV 10 18 µV/°C ● Input Offset Voltage Match (Channel-to-Channel) (Note 5) ● Input Offset Voltage Drift (Note 6) ● IB Input Bias Current ● 18 30 µA IOS Input Offset Current ● 0.6 3 µA Input Noise Voltage 0.1Hz to 10Hz 2 µVP-P 620567f 3 LT6205/LT6206/LT6207 ELECTRICAL CHARACTERISTICS The ● 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 PARAMETER CONDITIONS en Input Noise Voltage Density f = 10kHz MIN 9 nV/√Hz in Input Noise Current Density f = 10kHz 4 pA/√Hz Input Resistance VCM = –5V to 3V 1 MΩ 2 pF 90 dB Input Capacitance CMRR Common Mode Rejection Ratio VCM = –5V to 3V Input Voltage Range ● 78 TYP MAX ● –5 PSRR Power Supply Rejection Ratio VS = ±2V to ±6V ● 67 75 dB AVOL Large-Signal Voltage Gain VO = –4V to 4V, RL = 1k ● 50 133 V/mV VO = –3V to 3V, RL = 150Ω ● 7.5 20 V/mV Output Voltage Swing No Load, Input Overdrive = 30mV IOUT = ±5mA IOUT = ±25mA ● ● ● ±4.88 ±4.75 ±3.8 ±4.92 ±4.85 ±4.35 Short-Circuit Current Short to Ground ±40 ±30 ±60 ● ISC IS Supply Current per Amplifier 3 UNITS 4 ● GBW Gain Bandwidth Product f = 2MHz SR Slew Rate AV = –1, RL = 1k VO = –4V to 4V, Measured from –3V to 3V Channel Separation f = 10MHz FPBW Full Power Bandwidth VOUT = 8VP-P (Note 8) tS Settling Time to 3% Settling Time to 1% ∆VOUT = 2V, AV = –1, RL = 150Ω Differential Gain Differential Phase AV = 2, RL = 150Ω, Output Black Level = 1V AV = 2, RL = 150Ω, Output Black Level = 1V 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. ● V V V V mA mA 5.6 6.5 mA mA 65 100 MHz 350 600 V/µs 90 dB 24 MHz 15 25 ns ns 0.05 0.08 % Deg 14 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 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current per Amplifier vs Supply Voltage VOS Distribution 30 25 20 15 10 5 TA = 125°C 4 TA = 25°C 3 TA = –55°C 2 1 0 –2 –1 0 1 2 INPUT OFFSET VOLTAGE (mV) 3 0 1 2 3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V) 620567 G01 TA = 25°C 200 TA =125°C 0 –4 –4 –5 –6 TA = 125°C –7 –8 TA = 25°C –9 –10 5 0 1 TA = 25°C 0.01 0.01 TA = –55°C 0.1 1 10 LOAD CURRENT (mA) 100 620567 G07 OUTPUT SATURATION VOLTAGE (V) OUTPUT SATURATION VOLTAGE (V) 10 TA = 125°C 0.1 –6 –7 –8 –9 –10 1 2 3 4 INPUT COMMON MODE VOLTAGE (V) –12 –50 5 –25 0 25 50 75 TEMPERATURE (°C) 100 125 620567 G06 Output Saturation Voltage vs Load Current (Output High) VS = 5V, 0V VOD = 30mV VS = 5V, 0V VCM = 1V 620567 G05 Output Saturation Voltage vs Load Current (Output Low) 5.0 –11 TA = –55°C 620567 G04 10 2.5 3.0 3.5 4.0 4.5 TOTAL SUPPLY VOLTAGE (V) Input Bias Current vs Temperature –12 1 2 3 4 INPUT COMMON MODE VOLTAGE (V) 2.0 620567 G03 –5 –11 TA = –55°C 0 –500 INPUT BIAS CURRENT (µA) 400 TA = 25°C –400 VS = 5V, 0V –3 INPUT BIAS CURRENT (µA) OFFSET VOLTAGE CHANGE (µV) –2 VS = 5V, 0V 600 TA =125°C –300 Input Bias Current vs Input Common Mode Voltage 800 TA = –55°C –200 620567 G02 Change in Offset Voltage vs Input Common Mode Voltage 1000 –100 –600 1.5 0 –3 0 Short-Circuit Current vs Temperature 75 VS = 5V, 0V VOD = 30mV OUTPUT SHORT-CIRCUIT CURRENT (mA) PERCENT OF UNITS (%) SUPPLY CURRENT PER AMPLIFIER (mA) VS = 5V, 0V VCM = 1V 35 Minimum Supply Voltage 100 5 CHANGE IN INPUT OFFSET VOLTAGE (µV) 40 TA = 125°C 1 TA = 25°C 0.1 0.01 0.01 TA = –55°C 0.1 1 10 LOAD CURRENT (mA) 100 620567 G08 70 SINKING 65 VS = 5V, 0V VCM = 1V SOURCING 60 SINKING 55 SOURCING 50 45 VS = 3V, 0V VCM = 1V 40 35 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 125 620567 G09 620567f 5 LT6205/LT6206/LT6207 U W TYPICAL PERFOR A CE CHARACTERISTICS Short-Circuit Current vs Temperature Open-Loop Gain Open-Loop Gain 500 VS = ±5V 80 70 SOURCING 60 50 40 3O –50 100 RL = 1k –100 RL = 150Ω –200 0 25 50 75 TEMPERATURE (°C) 100 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT VOLTAGE (V) –5 –4 –3 –2 –1 0 1 2 3 OUTPUT VOLTAGE (V) 620567 G11 VS = ±5V 80 VS = 5V, 0V 60 40 20 25 10 20 30 40 50 60 70 80 90 100 TIME AFTER POWER-UP (s) 16 VS = 5V, 0V VCM = 1V TA = 25°C 20 15 10 5 0 100 0 1k 10k FREQUENCY (Hz) 14 VS = 5V, 0V VCM = 1V TA = 25°C 12 10 8 6 4 2 0 100 100k 1k 10k FREQUENCY (Hz) 100k 620567 G14 620567 G15 620567 G13 Gain Bandwidth and Phase Margin vs Supply Voltage Gain and Phase vs Frequency 70 VS = 5V, 0V VCM = 1V TA = 25°C 140 PHASE 60 40 GAIN (dB) 100 VS = 3V, 0V VS = ±5V 30 20 0 20 VS = 3V, 0V TA = 25°C RL = 1k CL = 5pF –20 100k TIME (2 SEC/DIV) 620567 G16 60 40 10 –10 80 GAIN 1M 0 VS = ±5V 10M FREQUENCY (Hz) 100M PHASE (DEG) NOISE VOLTAGE (1µV/DIV) 120 45 PHASE MARGIN 40 110 35 GAIN BANDWIDTH 105 PHASE MARGIN (DEG) 50 50 TA = 25°C RF = RG = 1k CL = 5pF GAIN BANDWIDTH (MHz) 0.1Hz to 10Hz Noise Voltage 5 Input Noise Current Density vs Frequency INPUT NOISE CURRENT DENSITY (pA/√Hz) 30 4 620567 G12 Input Noise Voltage Density vs Frequency INPUT NOISE VOLTAGE DENSITY (nV/√Hz) CHANGE IN OFFSET VOLTAGE (µV) RL = 150Ω –200 –500 0 TA = 25°C 100 –100 –400 125 RL = 1k 0 –400 Warm Up Drift vs Time (LT6206) 120 100 –300 –500 –25 200 –300 620567 G10 0 300 200 0 VS = ±5V TA = 25°C 400 INPUT VOLTAGE (µV) 300 SINKING 500 VS = 5V, 0V VCM = 1V TA = 25°C 400 INPUT VOLTAGE (µV) OUTPUT SHORT-CIRCUIT CURRENT (mA) 90 100 -20 -40 500M 620567 G17 95 0 2 4 6 8 10 TOTAL SUPPLY VOLTAGE (V) 12 620567 G18 620567f 6 LT6205/LT6206/LT6207 U W TYPICAL PERFOR A CE CHARACTERISTICS Gain Bandwidth and Phase Margin vs Temperature 50 700 45 35 VS = 3V, 0V VS = ±5V 120 110 80 –50 –25 0 25 50 75 TEMPERATURE (°C) FALLING VS = ±5V 600 550 RISING VS = 5V, 0V 500 100 350 –50 125 GAIN (dB) OUTPUT IMPEDANCE (Ω) VS = ±5V VCM = 0V 3 0 VS = 3V VCM = 1V –9 0 25 50 75 TEMPERATURE (°C) 100 125 1M 10M FREQUENCY (Hz) 100M AV = 10 AV = 1 AV = 2 10 1 0.1 100k 500M 1M 10M FREQUENCY (Hz) 70 60 40 30 20 10 30 40 35 VS = 5V, 0V AV = 1 TA = 25°C 0 10k 90 80 70 1M 10M FREQUENCY (Hz) 100M 1G 620567 G25 100M RS = 10Ω, RL = ∞ 25 20 RS = 20Ω, RL = ∞ 15 60 10 50 5 40 100k 1M 10M FREQUENCY (Hz) 30 20 10 100k Series Output Resistor vs Capacitive Load OVERSHOOT (%) 40 –PSRR 620567 G24 VS = ±5V LT6206 CH A-B 110 LT6207 CH A-D, CH B-C T = 25°C 100 A 80 50 +PSRR 50 0 10k 500M 120 VOLTAGE GAIN (dB) COMMON MODE REJECTION RATIO (dB) 100M VS = 5V, 0V TA = 25°C 80 620567 G23 VS = ±5V TA = 25°C 60 5 620567 G21 Channel Separation vs Frequency 70 4 90 100 Common Mode Rejection Ratio vs Frequency 90 3 Power Supply Rejection Ratio vs Frequency VS = 5V, 0V TA = 25°C 620567 G22 100 2 GAIN (AV) –12 –15 100k FALLING 500 400 –25 POWER SUPPLY REJECTION RATIO (dB) 1000 –6 550 Output Impedance vs Frequency 15 –3 RISING 600 620567 G20 Closed-Loop Gain vs Frequency 6 650 450 620567 G19 TA = 25°C 12 CL = 5pF A = +1 9 V VS = ±5V VO = –4V to 4V RL = 1k TA = 25°C 700 FALLING VS = 5V, 0V 400 GAIN BANDWIDTH 90 RISING VS = ±5V 450 VS = 3V, 0V 100 AV = –1 RG = RF = 1k RL = 1k 650 SLEW RATE (V/µs) 40 PHASE MARGIN Slew Rate vs Closed-Loop Gain 750 SLEW RATE (V/µs) VS = ±5V 750 PHASE MARGIN (DEG) GAIN BANDWIDTH (MHz) RL = 1k CL = 5pF Slew Rate vs Temperature 55 RL = RS = 50Ω 0 1M 10M FREQUENCY (Hz) 100M 620567 G26 10 100 CAPACITIVE LOAD (pF) 1000 620567 G27 620567f 7 LT6205/LT6206/LT6207 U W TYPICAL PERFOR A CE CHARACTERISTICS Maximum Undistorted Output Signal vs Frequency Series Output Resistor vs Capacitive Load VS = 5V, 0V AV = 2 TA = 25°C 9 RS = 10Ω, RL = ∞ OVERSHOOT (%) 30 25 20 RS = 20Ω, RL = ∞ 15 10 RL = RS = 50Ω 5 6 5 4 3 2 VS = ±5V TA = 25°C HD2, HD3 < –30dBc 0 0.1 1000 –70 RL = 1k, 2ND RL = 150Ω, 2ND RL = 150Ω, 3RD 1 10 FREQUENCY (MHz) –100 0.01 100 AV = +1 VO = 2VP–P VS = ±5V –40 RL = 150Ω, 3RD RL = 150Ω, 2ND –70 AV = +2 VO = 2VP–P VS = ±5V RL = 150Ω, 3RD –50 RL = 150Ω, 2ND –60 –70 –80 –90 RL = 1k, 3RD 10 Distortion vs Frequency –30 –60 –90 –90 –100 0.01 RL = 1k, 2ND RL = 1k, 3RD RL = 1k, 2ND 10 0.1 1 FREQUENCY (MHz) 620567 G31 –80 0.1 1 FREQUENCY (MHz) RL = 150Ω, 2ND RL = 1k, 3RD –50 –80 –100 0.01 RL = 150Ω, 3RD –70 –90 DISTORTION (dB) –40 DISTORTION (dB) DISTORTION (dB) AV = +2 VO = 2VP–P VS = 5V, 0V –60 –60 Distortion vs Frequency –30 –50 RL = 1k, 2ND –50 620567 G30 Distortion vs Frequency –40 AV = +1 VO = 2VP–P VS = 5V, 0V –80 620567 G28 –30 –40 AV = 2 7 0 100 CAPACITIVE LOAD (pF) AV = –1 8 1 10 –30 DISTORTION (dB) 35 Distortion vs Frequency 10 OUTPUT VOLTAGE SWING (VP–P) 40 0.1 1 FREQUENCY (MHz) 620567 G32 –100 0.01 10 0.1 1 FREQUENCY (MHz) 620567 G33 10 620567 G34 Small Signal Response VS = 5V, 0V 50mV/DIV 500mV/DIV Large Signal Response VS = 5V, 0V RL = 1k, 3RD 2.5V 0V VS = 5V, 0V AV = 1 RL = 150Ω 50ns/DIV 620567 G35 VS = 5V, 0V AV = 1 RL = 150Ω 50ns/DIV 620567 G36 620567f 8 LT6205/LT6206/LT6207 U W TYPICAL PERFOR A CE CHARACTERISTICS 0V VS = ±5V AV = 1 RL = 150Ω VIN (1V/DIV) 0V 0V VS = ±5V AV = 1 RL = 150Ω 50ns/DIV 620567 G37 Output-Overdrive Recovery VOUT (2V/DIV) 50mV/DIV Small Signal Response VS = ±5V 50ns/DIV 0V VS = 5V, 0V AV = 2 100ns/DIV 620567 G38 620567 G39 U W 1V/DIV Large Signal Response VS = ±5V U U APPLICATIO S I FOR ATIO V+ I1 I2 R2 I3 R3 Q13 Q9 Q2 V+ Q5 CM V+ R1 RIN 150Ω DESD1 Q3 Q10 Q7 Q1 +IN DESD2 D1 D3 D2 D4 Q4 DESD5 Q6 COMPLEMENTARY DRIVE GENERATOR Q8 OUT DESD6 V– Q12 Q11 V– V+ RIN 150Ω DESD3 –IN Q14 I4 R4 R5 V– DESD4 620567 F01 V– Figure 1. Simplified Schematic 620567f 9 LT6205/LT6206/LT6207 U W U U 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 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 10 LT6205/LT6206/LT6207 U W U U 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- 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 11 LT6205/LT6206/LT6207 U TYPICAL APPLICATIO 3.3V 1k 0.1µF 1k 75Ω VIDEO OUT 2.4k 4 C1 4.7µF – 75Ω 5 LT6205 3 COMPOSITE VIDEO IN 1VP–P + 1 2 BAT54 10k C2 4.7µF 470Ω IS ≤ 19mA 620567 TA02 Figure 2. Clamped AC-Input Video Cable Driver 620567f 12 LT6205/LT6206/LT6207 U PACKAGE DESCRIPTIO 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 3.85 MAX 2.62 REF 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 0.01 – 0.10 1.00 MAX DATUM ‘A’ 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 1.90 BSC S5 TSOT-23 0302 620567f 13 LT6205/LT6206/LT6207 U PACKAGE DESCRIPTIO MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 0.42 ± 0.038 (.0165 ± .0015) TYP 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.65 (.0256) BSC 8 7 6 5 0.52 (.0205) REF RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .006) DETAIL “A” 0° – 6° TYP GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 1 2 3 4 1.10 (.043) MAX 0.86 (.034) REF 0.18 (.007) SEATING PLANE 0.22 – 0.38 (.009 – .015) TYP 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 0.127 ± 0.076 (.005 ± .003) MSOP (MS8) 0603 620567f 14 LT6205/LT6206/LT6207 U PACKAGE DESCRIPTIO GN Package 16-Lead Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641) .189 – .196* (4.801 – 4.978) .045 ±.005 16 15 14 13 12 11 10 9 .254 MIN .009 (0.229) REF .150 – .165 .229 – .244 (5.817 – 6.198) .0165 ± .0015 .150 – .157** (3.810 – 3.988) .0250 TYP RECOMMENDED SOLDER PAD LAYOUT 1 .015 ± .004 × 45° (0.38 ± 0.10) .007 – .0098 (0.178 – 0.249) 2 3 4 5 6 7 .053 – .068 (1.351 – 1.727) 8 .004 – .0098 (0.102 – 0.249) 0° – 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) .008 – .012 (0.203 – 0.305) .0250 (0.635) BSC 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 GN16 (SSOP) 0502 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 U TYPICAL APPLICATIO YPBPR to RGB Converter CMPD6001S 5V 36Ω FMMT3906 1µF 150Ω R 4.7k 165Ω 499Ω 4 1 2 – – 75Ω 150Ω 16 15 499Ω 150Ω 3 Y + 75Ω + B 14 107Ω 150Ω 75Ω LT6207 5 6 365Ω 499Ω PB + + – – 12 80.6Ω 11 499Ω 10 7 150Ω 13 95.3Ω 174Ω 150Ω G 75Ω PR 133Ω F3dB ≈ 40MHz IS ≤ 60mA BLACK LEVELS ≈ 0V 1µF –5V R = Y + 1.4 • PR B = Y + 1.8 • PB G = Y – 0.34 • PB – 0.71 • PR 620567 TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1253/LT1254 Low Cost Dual and Quad Video Amplifiers –3dB Bandwidth = 90MHz, Current Feedback LT1395/LT1396/LT1397 Single Dual Quad 400MHz Current Feedback Amplifiers 0.1dB Flatness to 100MHz, 80mA Output Drive LT1675 RGB Multiplexer with Current Feedback Amplifiers –3dB Bandwidth = 250MHz, 100MHz Pixel Switching LT1809/LT1810 Single/Dual, 180MHz, Rail-to-Rail Input and Output Amplifiers 350V/µs Slew Rate, Shutdown, Low Distortion –90dBc at 5MHz LT6550/LT6551 3.3V Triple and Quad Video Amplifiers Internal Gain of 2, 110MHz –3dB Bandwidth, Input Common Modes to Ground LT6552 3.3V Single Supply Video Difference Amplifier Differential or Single-Ended Gain Block, 600V/µs Slew Rate, Input Common Modes to Ground 620567f 16 Linear Technology Corporation LT/TP 1003 1K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2003