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| LT1364/LT1365 Dual and Quad 70MHz, 1000V/s Op Amps FEATURES s s s s s s s s s s s s s s s s DESCRIPTIO 70MHz Gain Bandwidth 1000V/s Slew Rate 7.5mA Maximum Supply Current per Amplifier Unity-Gain Stable C-LoadTM Op Amp Drives All Capacitive Loads 9nV/Hz Input Noise Voltage 1.5mV Maximum Input Offset Voltage 2A Maximum Input Bias Current 350nA Maximum Input Offset Current 50mA Minimum Output Current 7.5V Minimum Output Swing into 150 4.5V/mV Minimum DC Gain, RL=1k 50ns Settling Time to 0.1%, 10V Step 0.06% Differential Gain, AV=2, RL=150 0.04 Differential Phase, AV=2, RL=150 Specified at 2.5V, 5V, and 15V The LT1364/LT1365 are dual and quad high speed operational amplifiers with outstanding AC and DC performance. The amplifiers feature much lower supply current and higher slew rate than devices with comparable bandwidth. The circuit topology is a voltage feedback amplifier with matched high impedance inputs and the slewing performance of a current feedback amplifier. The high slew rate and single stage design provide excellent settling characteristics which make the circuit an ideal choice for data acquisition systems. Each output drives a 150 load to 7.5V with 15V supplies and to 3.4V on 5V supplies. The amplifiers are stable with any capacitive load making them useful in buffer or cable driving applications. The LT1364/LT1365 are members of a family of fast, high performance amplifiers using this unique topology and employing Linear Technology Corporation's advanced bipolar complementary processing. For a single amplifier version of the LT1364/LT1365 see the LT1363 data sheet. For 50MHz devices with 4mA supply currents see the LT1360 through LT1362 data sheets. For lower supply current amplifiers see the LT1354 to LT1359 data sheets. Singles, duals, and quads of each amplifier are available. , LTC and LT are registered trademarks of Linear Technology Corporation. C-Load is a trademark of Linear Technology Corporation APPLICATIO S s s s s s s Wideband Amplifiers Buffers Active Filters Video and RF Amplification Cable Drivers Data Acquisition Systems TYPICAL APPLICATIO 2 Cable Driver Frequency Response AV = -1 Large-Signal Response 0 VS = 2.5V GAIN (dB) VS = 15V VS = 5V VS = 10V IN -2 -4 -6 + 1/2 LT1364 - 510 510 75 OUT 75 -8 1 10 FREQUENCY (MHz) 100 1364/1365 TA02 1364/1365 TA01 U U U 1 LT1364/LT1365 ABSOLUTE MAXIMUM RATINGS Total Supply Voltage (V + to V -) ............................... 36V Differential Input Voltage (Transient Only, Note 2) .................................... 10V Input Voltage ............................................................ VS Output Short-Circuit Duration (Note 3) ............ Indefinite PACKAGE/ORDER INFORMATION TOP VIEW OUT A -IN A +IN A V- 1 2 A 3 4 B 6 5 -IN B +IN B 8 7 V+ OUT B ORDER PART NUMBER LT1364CN8 N8 PACKAGE 8-LEAD PDIP TJMAX = 150C, JA = 130C/ W TOP VIEW OUT A 1 2 3 4 5 6 7 B C A D 14 OUT D 13 -IN D 12 +IN D 11 V - 10 +IN C 9 8 -IN C OUT C ORDER PART NUMBER LT1365CN -IN A +IN A V+ +IN B -IN B OUT B N PACKAGE 14-LEAD PDIP TJMAX = 150C, JA = 110C/ W Consult factory for Industrial and Military grade parts. ELECTRICAL CHARACTERISTICS SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS (Note 4) TA = 25C, VCM = 0V unless otherwise noted. VSUPPLY 15V 5V 2.5V 2.5V to 15V 2.5V to 15V MIN TYP 0.5 0.5 0.7 120 0.6 9 1 12 50 5 3 MAX 1.5 1.5 1.8 350 2.0 UNITS mV mV mV nA A nV/Hz pA/Hz M M pF IOS IB en in RIN CIN Input Offset Current Input Bias Current Input Noise Voltage Input Noise Current Input Resistance Input Resistance Input Capacitance f = 10kHz f = 10kHz VCM = 12V Differential 2 U U W WW U W (Note 1) Operating Temperature Range (Note 8) ...-40C to 85C Specified Temperature Range (Note 9) ....-40C to 85C Maximum Junction Temperature (See Below) Plastic Package ................................................ 150C Storage Temperature Range ..................-65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C TOP VIEW OUT A -IN A +IN A V- 1 2 A 3 4 B 6 5 -IN B +IN B 8 7 V+ OUT B ORDER PART NUMBER LT1364CS8 S8 PART MARKING 1364 ORDER PART NUMBER LT1365CS S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150C, JA = 190C/ W TOP VIEW OUT A 1 2 3 4 5 6 7 8 B C A D 16 OUT D 15 -IN D 14 +IN D 13 V - 12 +IN C 11 -IN C 10 OUT C 9 NC -IN A +IN A V+ +IN B -IN B OUT B NC S PACKAGE 16-LEAD PLASTIC SO TJMAX = 150C, JA = 150C/ W 2.5V to 15V 2.5V to 15V 15V 15V 15V LT1364/LT1365 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Input Voltage Range + TA = 25C, VCM = 0V unless otherwise noted. VSUPPLY 15V 5V 2.5V 15V 5V 2.5V MIN 12.0 2.5 0.5 TYP 13.4 3.4 1.1 -13.2 -12.0 -3.2 -2.5 -0.9 -0.5 84 76 66 90 15V 15V 15V 5V 5V 2.5V 15V 15V 5V 5V 2.5V 15V 5V 15V 15V 5V 15V 5V 15V 5V 2.5V 15V 5V 15V 5V 15V 5V 15V 15V 5V 15V 5V 15V 5V 15V 5V 15V 5V 15V 15V 15V 5V 100 50 35 4.5 3.0 2.0 3.0 2.0 2.5 13.5 13.0 3.5 3.4 1.3 50 23 70 750 300 90 81 71 100 9.0 6.5 3.8 6.4 5.6 5.2 14.0 13.7 4.1 3.8 1.7 60 29 105 1000 450 15.9 23.9 70 50 40 2.6 3.6 36 23 4.6 5.6 50 80 55 0.03 0.06 0.01 0.01 0.10 0.04 0.05 0.25 0.7 113 6.3 6.0 7.5 7.2 MAX UNITS V V V V V V dB dB dB dB V/mV V/mV V/mV V/mV V/mV V/mV V V V V V mA mA mA V/s V/s MHz MHz MHz MHz MHz ns ns % % ns ns ns ns ns % % % % Deg Deg Deg Deg dB mA mA CONDITIONS Input Voltage Range - CMRR Common Mode Rejection Ratio VCM = 12V VCM = 2.5V VCM = 0.5V VS = 2.5V to 15V VOUT = 12V, RL = 1k VOUT = 10V, RL = 500 VOUT = 7.5V, RL = 150 VOUT = 2.5V, RL = 500 VOUT = 2.5V, RL = 150 VOUT = 1V, RL = 500 RL = 1k, VIN = 40mV RL = 500, VIN = 40mV RL = 500, VIN = 40mV RL = 150, VIN = 40mV RL = 500, VIN = 40mV VOUT = 7.5V VOUT = 3.4V VOUT = 0V, VIN = 3V AV = - 2, (Note 5) 10V Peak, (Note 6) 3V Peak, (Note 6) f = 200kHz 15V 5V 2.5V PSRR AVOL Power Supply Rejection Ratio Large-Signal Voltage Gain VOUT Output Swing IOUT ISC SR Output Current Short-Circuit Current Slew Rate Full Power Bandwidth GBW Gain Bandwidth tr, tf Rise Time, Fall Time Overshoot Propagation Delay AV = 1, 10%-90%, 0.1V AV = 1, 0.1V 50% VIN to 50% VOUT, 0.1V 10V Step, 0.1%, AV = -1 10V Step, 0.01%, AV = -1 5V Step, 0.1%, AV = -1 f = 3.58MHz, AV = 2, RL = 150 f = 3.58MHz, AV = 2, RL = 1k ts Settling Time Differential Gain Differential Phase f = 3.58MHz, AV = 2, RL = 150 f = 3.58MHz, AV = 2, RL = 1k RO IS Output Resistance Channel Separation Supply Current AV = 1, f = 1MHz VOUT = 10V, RL = 500 Each Amplifier Each Amplifier 3 LT1364/LT1365 0C TA 70C, VCM = 0V unless otherwise noted. SYMBOL VOS PARAMETER Input Offset Voltage ELECTRICAL CHARACTERISTICS CONDITIONS (Note 4) The q denotes the specifications which apply over the temperature range VSUPPLY 15V 5V 2.5V 2.5V to 15V 2.5V to 15V 2.5V to 15V q q q q q q q q q q MIN TYP MAX 2.0 2.0 2.2 UNITS mV mV mV V/C nA A dB dB dB dB V/mV V/mV V/mV V/mV V/mV V V V V V mA mA mA V/s V/s MHz MHz dB Input VOS Drift IOS IB CMRR Input Offset Current Input Bias Current Common Mode Rejection Ratio (Note 7) 10 13 500 3 VCM = 12V VCM = 2.5V VCM = 0.5V VS = 2.5V to 15V VOUT = 12V, RL = 1k VOUT = 10V, RL = 500 VOUT = 2.5V, RL = 500 VOUT = 2.5V, RL = 150 VOUT = 1V, RL = 500 RL = 1k, VIN = 40mV RL = 500, VIN = 40mV RL = 500, VIN = 40mV RL = 150, VIN = 40mV RL = 500, VIN = 40mV VOUT = 12.8V VOUT = 3.3V VOUT = 0V, VIN = 3V AV = - 2, (Note 5) f = 200kHz VOUT = 10V, RL = 500 Each Amplifier Each Amplifier 15V 5V 2.5V 15V 15V 5V 5V 2.5V 15V 15V 5V 5V 2.5V 15V 5V 15V 15V 5V 15V 5V 15V 15V 5V 82 74 64 88 3.6 2.4 2.4 1.5 2.0 13.4 12.8 3.4 3.3 1.2 25 22 55 600 225 44 31 98 8.7 8.4 PSRR AVOL Power Supply Rejection Ratio Large-Signal Voltage Gain q q q q q q q q q q q q q q q q q q q q VOUT Output Swing IOUT ISC SR GBW Output Current Short-Circuit Current Slew Rate Gain Bandwidth Channel Separation IS Supply Current mA mA The q denotes the specifications which apply over the temperature range - 40C TA 85C, VCM = 0V unless otherwise noted. (Note 9) SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS (Note 4) VSUPPLY 15V 5V 2.5V 2.5V to 15V 2.5V to 15V 2.5V to 15V VCM = 12V VCM = 2.5V VCM = 0.5V VS = 2.5V to 15V VOUT = 12V, RL = 1k VOUT = 10V, RL = 500 VOUT = 2.5V, RL = 500 VOUT = 2.5V, RL = 150 VOUT = 1V, RL = 500 15V 15V 5V 5V 2.5V 15V 5V 2.5V q q q q q q q q q q q q q q q MIN TYP MAX 2.5 2.5 2.7 UNITS mV mV mV V/C nA A dB dB dB dB V/mV V/mV V/mV V/mV V/mV Input VOS Drift IOS IB CMRR Input Offset Current Input Bias Current Common Mode Rejection Ratio (Note 7) 10 13 600 3.6 82 74 64 87 2.5 1.5 1.5 1.0 1.3 PSRR AVOL Power Supply Rejection Ratio Large-Signal Voltage Gain 4 LT1364/LT1365 The q denotes the specifications which apply over the temperature range - 40C TA 85C, VCM = 0V unless otherwise noted. (Note 9) SYMBOL VOUT PARAMETER Output Swing CONDITIONS RL = 1k, VIN = 40mV RL = 500, VIN = 40mV RL = 500, VIN = 40mV RL = 150, VIN = 40mV RL = 500, VIN = 40mV VOUT = 12.7V VOUT = 3.2V VOUT = 0V, VIN = 3V AV = - 2, (Note 5) f = 200kHz VOUT = 10V, RL = 500 Each Amplifier Each Amplifier VSUPPLY 15V 15V 5V 5V 2.5V 15V 5V 15V 15V 5V 15V 5V 15V 15V 5V q q q q q q q q q q q q q q q ELECTRICAL CHARACTERISTICS MIN 13.4 12.7 3.4 3.2 1.2 25 21 50 550 180 43 30 98 TYP MAX UNITS V V V V V mA mA mA V/s V/s MHz MHz dB IOUT ISC SR GBW Output Current Short-Circuit Current Slew Rate Gain Bandwidth Channel Separation IS Supply Current 9.0 8.7 mA mA Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Differential inputs of 10V are appropriate for transient operation only, such as during slewing. Large, sustained differential inputs will cause excessive power dissipation and may damage the part. See Input Considerations in the Applications Information section of this data sheet for more details. Note 3: A heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely. Note 4: Input offset voltage is pulse tested and is exclusive of warm-up drift. Note 5: Slew rate is measured between 10V on the output with 6V input for 15V supplies and 1V on the output with 1.75V input for 5V supplies. Note 6: Full power bandwidth is calculated from the slew rate measurement: FPBW = SR/2VP. Note 7: This parameter is not 100% tested. Note 8: The LT1364C/LT1365C are guaranteed functional over the operating temperature range of -40C to 85C. Note 9: The LT1364C/LT1365C are guaranteed to meet specified performance from 0C to 70C. The LT1364C/LT1365C are designed, characterized and expected to meet specified performance from - 40C to 85C, but are not tested or QA sampled at these temperatures. For guaranteed I-grade parts, consult the factory. TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage and Temperature 10 SUPPLY CURRENT (mA) 125C 6 25C -55C 4 COMMON MODE RANGE (V) INPUT BIAS CURRENT (A) 8 2 0 0 5 10 15 SUPPLY VOLTAGE (V) 20 1364/1365 G01 UW Input Common Mode Range vs Supply Voltage V+ -0.5 -1.0 -1.5 -2.0 TA = 25C VOS < 1mV 0.8 1.0 Input Bias Current vs Input Common Mode Voltage VS = 15V TA = 25C IB+ + IB- IB = -------- 2 0.6 2.0 1.5 1.0 0.5 V- 0 5 10 15 SUPPLY VOLTAGE (V) 20 1364/1365 G02 0.4 0.2 -15 -10 -5 0 5 10 INPUT COMMON MODE VOLTAGE (V) 15 1364/1365 G03 5 LT1364/LT1365 TYPICAL PERFORMANCE CHARACTERISTICS Input Bias Current vs Temperature 1.4 1.2 INPUT BIAS CURRENT (A) INPUT VOLTAGE NOISE (nV/Hz) VS = 15V IB+ + IB- IB = -------- 2 1.0 0.8 0.6 0.4 0.2 0 -50 OPEN-LOOP GAIN (dB) -25 0 25 50 75 TEMPERATURE (C) Open-Loop Gain vs Temperature 81 80 VS = 15V VO = 12V RL = 1k OUTPUT VOLTAGE SWING (V) 79 78 77 76 75 74 - 50 OUTPUT VOLTAGE SWING (V) OPEN-LOOP GAIN (dB) -25 0 25 50 75 TEMPERATURE (C) Output Short-Circuit Current vs Temperature 140 OUTPUT SHORT-CIRCUIT CURRENT (mA) VS = 5V 130 120 110 SOURCE 100 SINK 90 80 70 -50 OUTPUT STEP (V) 1mV 2 0 -2 -4 -6 -8 -10 10mV 1mV OUTPUT STEP (V) -25 0 25 50 75 TEMPERATURE (C) 6 UW 100 1364/1365 G04 Input Noise Spectral Density 100 VS = 15V TA = 25C AV = 101 RS = 100k in en 1 10 INPUT CURRENT NOISE (pA/Hz) 85 Open-Loop Gain vs Resistive Load TA = 25C 80 VS = 15V 75 VS = 5V 10 70 65 1 125 10 100 1k 10k FREQUENCY (Hz) 0.1 100k 1364/1365 G05 60 10 100 1k LOAD RESISTANCE () 10k 1364/1365 G06 Output Voltage Swing vs Supply Voltage V+ -0.5 -1.0 -1.5 -2.0 RL = 500 TA = 25C RL = 1k Output Voltage Swing vs Load Current V+ -0.5 -1.0 -1.5 -2.0 25C 25C -40C VS = 5V VIN = 100mV 85C 2.0 1.5 1.0 0.5 V - RL = 500 RL = 1k 2.0 1.5 1.0 85C 0.5 - V -50 -40 -30 -20 -10 0 10 20 30 40 50 OUTPUT CURRENT (mA) 1364/1365 G09 -40C 100 125 0 5 10 15 SUPPLY VOLTAGE (V) 20 1364/1365 G08 1364/1365 G07 Settling Time vs Output Step (Noninverting) 10 8 6 4 VS = 15V AV = 1 RL = 1k 10mV 10 8 6 4 2 0 -2 -4 Settling Time vs Output Step (Inverting) VS = 15V AV = -1 RF = 1k CF = 3pF 10mV 1mV 10mV -6 -8 -10 1mV 100 125 0 20 40 60 80 SETTLING TIME (ns) 100 0 20 40 60 80 SETTLING TIME (ns) 100 1364/1365 G10 1364/1365 G11 1364/1365 G12 LT1364/LT1365 TYPICAL PERFORMANCE CHARACTERISTICS Output Impedance vs Frequency 100 VS = 15V TA = 25C AV = 100 GAIN (dB) OUTPUT IMPEDANCE () 10 40 30 20 10 0 TA = 25C AV = -1 RF = RG = 1k 100k VS = 5V VS = 5V 60 40 20 0 CROSSTALK (dB) 1 AV = 10 AV = 1 0.1 0.01 10k 100k 1M 10M FREQUENCY (Hz) Gain Bandwidth and Phase Margin vs Temperature 130 120 PHASE MARGIN VS = 5V PHASE MARGIN VS = 15V GAIN BANDWIDTH VS = 15V 50 45 40 10 8 6 GAIN BANDWIDTH (MHz) 100 90 80 70 60 50 40 30 - 50 GAIN BANDWIDTH VS = 5V -25 35 30 25 20 15 10 5 4 15V VOLTAGE MAGNITUDE (dB) 110 GAIN (dB) 0 25 50 75 TEMPERATURE (C) Gain Bandwidth and Phase Margin vs Supply Voltage 130 120 110 GAIN BANDWIDTH (MHz) TA = 25C 48 46 PHASE MARGIN (DEG) COMMON-MODE REJECTION RATIO (dB) POWER SUPPLY REJECTION RATIO (dB) 100 90 80 70 60 50 40 30 0 PHASE MARGIN GAIN BANDWIDTH 5 10 15 SUPPLY VOLTAGE (V) UW 1364/1365 G13 Gain and Phase vs Frequency 70 60 50 GAIN PHASE VS = 15V VS = 15V 120 100 80 PHASE (DEG) Crosstalk vs Frequency - 20 - 30 - 40 - 50 - 60 -70 - 80 - 90 VS = 15V RL = 1k VS = 5V RL = 500 TA = 25C AV = 1 VIN = 0dBm -100 -110 100M 1364/1365 G14 100M -10 10k 1M 10M FREQUENCY (Hz) -120 100k 1M 10M FREQUENCY (Hz) 100M 1364/1365 G21 Frequency Response vs Supply Voltage (AV = 1) 15 TA = 25C AV = 1 RL = 1k 12 9 6 3 0 -3 -6 -9 -12 Frequency Response vs Capacitive Load VS = 15V TA = 25C AV = -1 C = 1000pF C = 500pF C = 100pF C = 50pF C=0 PHASE MARGIN (DEG) 2 0 -2 -4 -6 -8 -10 100k 1M 10M FREQUENCY (Hz) 5V 2.5V 100 0 125 100M 1364/1365 G17 -15 1M 10M FREQUENCY (Hz) 100M 1364/1365 G18 1364/1365 G16 Power Supply Rejection Ratio vs Frequency 50 100 +PSRR 80 - PSRR VS = 15V TA = 25C 120 100 80 60 40 20 0 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M Common Mode Rejection Ratio vs Frequency VS = 15V TA = 25C 44 42 40 38 36 34 32 30 20 1364/1365 G15 60 40 20 0 100 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 1364/1365 G19 1364/1365 G20 7 LT1364/LT1365 TYPICAL PERFORMANCE CHARACTERISTICS Slew Rate vs Supply Voltage 2400 2200 2000 1800 SLEW RATE (V/s) 1600 1400 1200 1000 800 600 400 200 0 0 5 10 SUPPLY VOLTAGE (V) 15 1364/1365 G22 1000 800 600 VS = 5V 400 200 -50 VS = 15V SLEW RATE (V/S) SLEW RATE (V/s) TA = 25C AV = -1 RF = RG = 1k SR+ + SR- SR = ---------- 2 Total Harmonic Distortion vs Frequency 0.01 30 TA = 25C VO = 3VRMS RL = 500 25 20 15 10 5 TOTAL HARMONIC DISTORTION (%) OUTPUT VOLTAGE (VP-P) OUTPUT VOLTAGE (VP-P) 0.001 AV = -1 AV = 1 0.0001 10 100 1k 10k FREQUENCY (Hz) 100k 1364/1365 G25 2nd and 3rd Harmonic Distortion vs Frequency -40 -50 -60 -70 2ND HARMONIC -80 -90 VS = 15V VO = 2VP-P RL = 500 AV = 2 HARMONIC DISTORTION (dB) 3RD HARMONIC DIFFERENTIAL PHASE (DEG) 0.3 0 OVERSHOOT (%) -100 100k 200k 400k 1M 2M FREQUENCY (Hz) 8 UW 4M 1364/1365 G28 Slew Rate vs Temperature 1400 1200 AV = -2 SR+ + SR- SR = ---------- 2 2000 1800 1600 1400 1200 1000 800 600 400 200 0 -25 0 25 50 75 TEMPERATURE (C) 100 125 Slew Rate vs Input Level TA = 25C VS = 15V AV = -1 RF = RG = 1k SR+ + SR - SR = ---------- 2 0 2 4 6 8 10 12 14 16 18 INPUT LEVEL (VP-P) 20 1364/1365 G23 1364/1365 G24 Undistorted Output Swing vs Frequency (15V) AV = -1 10 Undistorted Output Swing vs Frequency (5V) AV = -1 AV = 1 8 6 AV = 1 4 VS = 15V RL = 1k AV = 1, 1% MAX DISTORTION AV = -1, 2% MAX DISTORTION 1M FREQUENCY (Hz) 10M 1364/1365 G26 2 VS = 5V RL = 1k 2% MAX DISTORTION 1M FREQUENCY (Hz) 10M 1364/1365 G27 0 100k 0 100k Differential Gain and Phase vs Supply Voltage 0.2 Capacitive Load Handling 100 TA = 25C VS = 15V AV = -1 DIFFERENTIAL GAIN (%) 0.1 DIFFERENTIAL GAIN 50 0.2 DIFFERENTIAL PHASE 0.1 AV = 2 RL = 150 TA = 25C 5 10 SUPPLY VOLTAGE (V) 15 1364/1365 G29 AV = 1 0 10p 0.0 10M 100p 1000p 0.01 0.1 CAPACITIVE LOAD (F) 1 1364/1365 G30 LT1364/LT1365 TYPICAL PERFORMANCE CHARACTERISTICS Small-Signal Transient (AV = 1) Small-Signal Transient (AV = -1) Small-Signal Transient (AV = -1, CL = 200pF) 1364/1365 TA31 Large-Signal Transient (AV = 1) 1364/1365 TA34 APPLICATIONS INFORMATION Layout and Passive Components The LT1364/LT1365 amplifiers are easy to use and tolerant of less than ideal layouts. For maximum performance (for example, fast 0.01% settling) use a ground plane, short lead lengths, and RF-quality bypass capacitors (0.01F to 0.1F). For high drive current applications use low ESR bypass capacitors (1F to 10F tantalum). The parallel combination of the feedback resistor and gain setting resistor on the inverting input combine with the input capacitance to form a pole which can cause peaking or oscillations. If feedback resistors greater than 5k are used, a parallel capacitor of value CF > RG x CIN/RF should be used to cancel the input pole and optimize dynamic performance. For unity-gain applications where a large feedback resistor is used, CF should be greater than or equal to CIN. Input Considerations Each of the LT1364/LT1365 inputs is the base of an NPN and a PNP transistor whose base currents are of opposite polarity and provide first-order bias current cancellation. Because of variation in the matching of NPN and PNP beta, the polarity of the input bias current can be positive or negative. The offset current does not depend on NPN/PNP beta matching and is well controlled. The use of balanced source resistance at each input is recommended for applications where DC accuracy must be maximized. The inputs can withstand transient differential input voltages up to 10V without damage and need no clamping or source resistance for protection. Differential inputs, however, generate large supply currents (tens of mA) as required for high slew rates. If the device is used with sustained differential inputs, the average supply current will increase, excessive power dissipation will result and the part may be damaged. The part should not be used as U W UW 1364/1365 TA32 1364/1365 TA33 Large-Signal Transient (AV = -1) Large-Signal Transient (AV = 1, CL = 10,000pF) 1364/1365 TA35 1364/1365 TA36 U U 9 LT1364/LT1365 APPLICATIONS INFORMATION a comparator, peak detector or other open-loop application with large, sustained differential inputs. Under normal, closed-loop operation, an increase of power dissipation is only noticeable in applications with large slewing outputs and is proportional to the magnitude of the differential input voltage and the percent of the time that the inputs are apart. Measure the average supply current for the application in order to calculate the power dissipation. Capacitive Loading The LT1364/LT1365 are stable with any capacitive load. This is accomplished by sensing the load induced output pole and adding compensation at the amplifier gain node. As the capacitive load increases, both the bandwidth and phase margin decrease so there will be peaking in the frequency domain and in the transient response as shown in the typical performance curves. The photo of the small signal response with 200pF load shows 62% peaking. The large signal response shows the output slew rate being limited to 10V/s by the short-circuit current. Coaxial cable can be driven directly, but for best pulse fidelity a resistor of value equal to the characteristic impedance of the cable (i.e., 75) should be placed in series with the output. The other end of the cable should be terminated with the same value resistor to ground. Circuit Operation The LT1364/LT1365 circuit topology is a true voltage feedback amplifier that has the slewing behavior of a current feedback amplifier. The operation of the circuit can be understood by referring to the simplified schematic. The inputs are buffered by complementary NPN and PNP emitter followers which drive a 500 resistor. The input voltage appears across the resistor generating currents which are mirrored into the high impedance node. Complementary followers form an output stage which buffers the gain node from the load. The bandwidth is set by the input resistor and the capacitance on the high impedance node. The slew rate is determined by the current available to charge the gain node capacitance. This current is the differential input voltage divided by R1, so the slew rate is proportional to the input. Highest slew rates are therefore seen in the lowest gain configurations. For example, a 10V output step in a gain of 10 has only a 1V input step, whereas the same output step in unity gain has a 10 times greater input step. The curve of Slew Rate vs Input Level illustrates this relationship. The LT1364/LT1365 are tested for slew rate in a gain of -2 so higher slew rates can be expected in gains of 1 and -1, and lower slew rates in higher gain configurations. The RC network across the output stage is bootstrapped when the amplifier is driving a light or moderate load and has no effect under normal operation. When driving a capacitive load (or a low value resistive load) the network is incompletely bootstrapped and adds to the compensation at the high impedance node. The added capacitance slows down the amplifier which improves the phase margin by moving the unity-gain frequency away from the pole formed by the output impedance and the capacitive load. The zero created by the RC combination adds phase to ensure that even for very large load capacitances, the total phase lag can never exceed 180 degrees (zero phase margin) and the amplifier remains stable. Power Dissipation The LT1364/LT1365 combine high speed and large output drive in small packages. Because of the wide supply voltage range, it is possible to exceed the maximum junction temperature under certain conditions. Maximum junction temperature (TJ) is calculated from the ambient temperature (TA) and power dissipation (PD) as follows: LT1364CN8: LT1364CS8: LT1365CN: LT1365CS: TJ = TA + (PD x 130C/W) TJ = TA + (PD x 190C/W) TJ = TA + (PD x 110C/W) TJ = TA + (PD x 150C/W) 10 U W U U Worst case power dissipation occurs at the maximum supply current and when the output voltage is at 1/2 of either supply voltage (or the maximum swing if less than 1/2 supply voltage). For each amplifier PDMAX is: PDMAX = (V+ - V-)(ISMAX) + (V+/2)2/RL Example: LT1365 in S16 at 70C, VS = 5V, RL = 150W PDMAX = (10V)(8.4mA) + (2.5V)2/150 = 126mW TJMAX = 70C + (4 x 126mW)(150C/W) = 145C LT1364/LT1365 SI PLIFIED SCHE ATIC V+ -IN C V- 1364/1365 SS01 PACKAGE DESCRIPTION 0.300 - 0.325 (7.620 - 8.255) 0.009 - 0.015 (0.229 - 0.381) 0.065 (1.651) TYP 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 0.003 (0.457 0.076) ( +0.035 0.325 -0.015 +0.889 8.255 -0.381 ) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 0.300 - 0.325 (7.620 - 8.255) 0.130 0.005 (3.302 0.127) 0.020 (0.508) MIN 0.009 - 0.015 (0.229 - 0.381) 0.005 (0.125) MIN 0.100 (2.54) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. BSC MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) +0.035 0.325 -0.015 8.255 +0.889 -0.381 ( ) 0.125 (3.175) MIN 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. U W W R1 500 +IN RC CC OUT Dimension in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.130 0.005 (3.302 0.127) 0.400* (10.160) MAX 8 7 6 5 0.045 - 0.065 (1.143 - 1.651) 0.255 0.015* (6.477 0.381) 1 2 3 4 0.100 (2.54) BSC N8 1098 N Package 14-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.770* (19.558) MAX 14 13 12 11 10 9 8 0.045 - 0.065 (1.143 - 1.651) 0.065 (1.651) TYP 0.018 0.003 (0.457 0.076) 0.255 0.015* (6.477 0.381) 1 2 3 4 5 6 7 N14 1098 11 LT1364/LT1365 TYPICAL APPLICATIONS Two Op Amp Instrumentation Amplifier R5 220 R1 10k R2 1k 464 1.33k 220pF - 1/2 LT1364 R3 1k - VIN + + R4 1 R2 R3 R2 + R3 GAIN = 1 + + + R5 R3 2 R1 R4 TRIM R5 FOR GAIN TRIM R1 FOR COMMON-MODE REJECTION BW = 700kHz ( ) = 102 1364/1365 TA01 PACKAGE DESCRIPTION 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP 0.014 - 0.019 (0.355 - 0.483) TYP *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 0.016 - 0.050 (0.406 - 1.270) 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0.053 - 0.069 (1.346 - 1.752) 0 - 8 TYP 0.014 - 0.019 0.016 - 0.050 (0.355 - 0.483) (0.406 - 1.270) TYP *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 RELATED PARTS PART NUMBER LT1363 LT1361/LT1362 LT1358/LT1359 LT1813 DESCRIPTION 70MHz, 1000V/s Op Amp Dual and Quad 50MHz, 800V/s Op Amps Dual and Quad 25MHz, 600V/s Op Amps Dual 100MHz, 700V/s Op Amps COMMENTS Single Version of LT1364/LT1365 Lower Power Version of LT1364/LT1365, VOS = 1mV, 4mA/Amplifier Lower Power Version of LT1364/LT1365, VOS = 0.6mV, 2mA/Amplifier Low Voltage, Low Power LT1364/LT1365, 3mA/Amplifier 13645fa LT/TP 0400 2K REV A * PRINTED IN USA 12 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com U U 2MHz, 4th Order Butterworth Filter 464 47pF 22pF 549 R4 10k VIN - 1/2 LT1364 549 1.13k 470pF - 1/2 LT1364 VOUT - 1/2 LT1364 VOUT + + + 1364/1365 TA04 Dimension in inches (millimeters) unless otherwise noted. S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.189 - 0.197* (4.801 - 5.004) 0.053 - 0.069 (1.346 - 1.752) 8 0.004 - 0.010 (0.101 - 0.254) 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157** (3.810 - 3.988) 7 6 5 0.050 (1.270) BSC 1 2 3 4 SO8 1298 S Package 16-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.386 - 0.394* (9.804 - 10.008) 0.004 - 0.010 (0.101 - 0.254) 16 15 14 13 12 11 10 9 0.050 (1.270) BSC 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157** (3.810 - 3.988) 1 2 3 4 5 6 7 8 S16 1098 (c) LINEAR TECHNOLOGY CORPORATION 1994 |
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