LT1364/LT1365 Dual and Quad 70MHz, 1000V/µs Op Amps U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 70MHz Gain Bandwidth 1000V/µs 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 2µA Maximum Input Bias Current 350nA Maximum Input Offset Current 50mA Minimum Output Current ±7.5V Minimum Output Swing into 150Ω 4.5V/mV Minimum DC Gain, RL=1k 50ns Settling Time to 0.1%, 10V Step 0.06% Differential Gain, AV=2, RL=150Ω 0.04° Differential Phase, AV=2, RL=150Ω Specified at ±2.5V, ±5V, and ±15V U APPLICATIO S ■ ■ ■ ■ ■ Wideband Amplifiers Buffers Active Filters Video and RF Amplification Cable Drivers Data Acquisition Systems 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 U ■ 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 150Ω 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. TYPICAL APPLICATIO Cable Driver Frequency Response AV = –1 Large-Signal Response 2 VS = ±15V 0 GAIN (dB) VS = ±2.5V VS = ±5V –2 VS = ±10V IN –4 –6 + 1/2 LT1364 – 510Ω 75Ω OUT 75Ω 510Ω –8 1 10 FREQUENCY (MHz) 100 1364/1365 TA02 1364/1365 TA01 1 LT1364/LT1365 W W U W ABSOLUTE MAXIMUM RATINGS (Note 1) 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 Operating Temperature Range (Note 8) ...–40°C to 85°C Specified Temperature Range (Note 9) ....–40°C to 85°C Maximum Junction Temperature (See Below) Plastic Package ................................................ 150°C Storage Temperature Range ..................–65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C W U U PACKAGE/ORDER INFORMATION TOP VIEW OUT A 1 –IN A 2 +IN A 3 V– 4 V+ 8 7 OUT B 6 –IN B 5 +IN B A B ORDER PART NUMBER LT1364CN8 TOP VIEW OUT A 1 –IN A 2 +IN A 3 V– 4 OUT B 6 –IN B B 5 +IN B LT1364CS8 S8 PART MARKING ORDER PART NUMBER 1364 1 –IN A 2 +IN A 3 V+ 4 10 +IN C +IN B 5 9 –IN C –IN B 6 8 OUT C OUT B 7 10 OUT C NC 8 9 1 14 OUT D –IN A 2 13 –IN D +IN A 3 V+ 4 +IN B 5 –IN B 6 OUT B 7 12 +IN D LT1365CN 11 V – C N PACKAGE 14-LEAD PDIP ORDER PART NUMBER TOP VIEW OUT A OUT A B 7 S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 190°C/ W TOP VIEW D ORDER PART NUMBER V+ A N8 PACKAGE 8-LEAD PDIP TJMAX = 150°C, θJA = 130°C/ W A 8 16 OUT D 15 –IN D A D LT1365CS 14 +IN D 13 V – 12 +IN C B C 11 –IN C NC S PACKAGE 16-LEAD PLASTIC SO TJMAX = 150°C, θJA = 110°C/ W TJMAX = 150°C, θJA = 150°C/ W Consult factory for Industrial and Military grade parts. ELECTRICAL CHARACTERISTICS TA = 25°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS VSUPPLY TYP MAX UNITS VOS Input Offset Voltage (Note 4) ±15V ±5V ±2.5V 0.5 0.5 0.7 1.5 1.5 1.8 mV mV mV IOS Input Offset Current ±2.5V to ±15V 120 350 nA IB Input Bias Current ±2.5V to ±15V 0.6 2.0 µA en Input Noise Voltage f = 10kHz ±2.5V to ±15V 9 nV/√Hz in Input Noise Current f = 10kHz ±2.5V to ±15V RIN Input Resistance VCM = ±12V ±15V Input Resistance Differential CIN 2 Input Capacitance MIN 1 pA/√Hz 50 MΩ ±15V 5 MΩ ±15V 3 pF 12 LT1364/LT1365 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER TA = 25°C, VCM = 0V unless otherwise noted. VSUPPLY MIN TYP + ±15V ±5V ±2.5V 12.0 2.5 0.5 13.4 3.4 1.1 Input Voltage Range – ±15V ±5V ±2.5V Input Voltage Range CONDITIONS VCM = ±12V VCM = ±2.5V VCM = ±0.5V MAX UNITS V V V –13.2 –12.0 –3.2 –2.5 –0.9 –0.5 V V V ±15V ±5V ±2.5V 84 76 66 90 81 71 90 100 dB VOUT = ±12V, RL = 1k VOUT = ±10V, RL = 500Ω VOUT = ±7.5V, RL = 150Ω VOUT = ±2.5V, RL = 500Ω VOUT = ±2.5V, RL = 150Ω VOUT = ±1V, RL = 500Ω ±15V ±15V ±15V ±5V ±5V ±2.5V 4.5 3.0 2.0 3.0 2.0 2.5 9.0 6.5 3.8 6.4 5.6 5.2 V/mV V/mV V/mV V/mV V/mV V/mV Output Swing RL = 1k, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 150Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV ±15V ±15V ±5V ±5V ±2.5V 13.5 13.0 3.5 3.4 1.3 14.0 13.7 4.1 3.8 1.7 ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±7.5V VOUT = ±3.4V ±15V ±5V 50 23 60 29 mA mA ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V 70 105 mA SR Slew Rate AV = – 2, (Note 5) ±15V ±5V 750 300 1000 450 V/µs V/µs Full Power Bandwidth 10V Peak, (Note 6) 3V Peak, (Note 6) ±15V ±5V 15.9 23.9 MHz MHz GBW Gain Bandwidth f = 200kHz ±15V ±5V ±2.5V 70 50 40 MHz MHz MHz tr, tf Rise Time, Fall Time AV = 1, 10%-90%, 0.1V ±15V ±5V 2.6 3.6 ns ns Overshoot AV = 1, 0.1V ±15V ±5V 36 23 % % Propagation Delay 50% VIN to 50% VOUT, 0.1V ±15V ±5V 4.6 5.6 ns ns Settling Time 10V Step, 0.1%, AV = –1 10V Step, 0.01%, AV = –1 5V Step, 0.1%, AV = –1 ±15V ±15V ±5V 50 80 55 ns ns ns Differential Gain f = 3.58MHz, AV = 2, RL = 150Ω ±15V ±5V ±15V ±5V 0.03 0.06 0.01 0.01 % % % % ±15V ±5V ±15V ±5V 0.10 0.04 0.05 0.25 Deg Deg Deg Deg CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V AVOL Large-Signal Voltage Gain VOUT ts f = 3.58MHz, AV = 2, RL = 1k Differential Phase f = 3.58MHz, AV = 2, RL = 150Ω f = 3.58MHz, AV = 2, RL = 1k RO IS Output Resistance AV = 1, f = 1MHz ±15V Channel Separation VOUT = ±10V, RL = 500Ω ±15V Supply Current Each Amplifier Each Amplifier ±15V ±5V 50 35 100 dB dB dB 0.7 Ω 113 dB 6.3 6.0 7.5 7.2 mA mA 3 LT1364/LT1365 ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted. The ● denotes the specifications which apply over the temperature range SYMBOL PARAMETER CONDITIONS VSUPPLY MIN VOS Input Offset Voltage (Note 4) ±15V ±5V ±2.5V ● ● ● Input VOS Drift (Note 7) ±2.5V to ±15V ● TYP 10 MAX UNITS 2.0 2.0 2.2 mV mV mV 13 µV/°C IOS Input Offset Current ±2.5V to ±15V ● 500 nA IB Input Bias Current ±2.5V to ±15V ● 3 µA CMRR Common Mode Rejection Ratio ±15V ±5V ±2.5V ● ● ● PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V ● 88 dB AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 1k VOUT = ±10V, RL = 500Ω VOUT = ±2.5V, RL = 500Ω VOUT = ±2.5V, RL = 150Ω VOUT = ±1V, RL = 500Ω ±15V ±15V ±5V ±5V ±2.5V ● ● ● ● ● 3.6 2.4 2.4 1.5 2.0 V/mV V/mV V/mV V/mV V/mV VOUT Output Swing RL = 1k, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 150Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV ±15V ±15V ±5V ±5V ±2.5V ● ● ● ● ● 13.4 12.8 3.4 3.3 1.2 ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±12.8V VOUT = ±3.3V ±15V ±5V ● ● 25 22 mA mA ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V ● 55 mA SR Slew Rate AV = – 2, (Note 5) ±15V ±5V ● ● 600 225 V/µs V/µs GBW Gain Bandwidth f = 200kHz ±15V ±5V ● ● 44 31 MHz MHz Channel Separation VOUT = ±10V, RL = 500Ω ±15V ● 98 dB Supply Current Each Amplifier Each Amplifier ±15V ±5V ● ● IS VCM = ±12V VCM = ±2.5V VCM = ±0.5V 82 74 64 dB dB dB 8.7 8.4 mA mA The ● denotes the specifications which apply over the temperature range – 40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted. (Note 9) SYMBOL PARAMETER CONDITIONS VSUPPLY VOS Input Offset Voltage (Note 4) ±15V ±5V ±2.5V ● ● ● MIN Input VOS Drift (Note 7) ±2.5V to ±15V ● TYP 10 MAX UNITS 2.5 2.5 2.7 mV mV mV 13 µV/°C IOS Input Offset Current ±2.5V to ±15V ● 600 nA IB Input Bias Current ±2.5V to ±15V ● 3.6 µA CMRR Common Mode Rejection Ratio VCM = ±12V VCM = ±2.5V VCM = ±0.5V ±15V ±5V ±2.5V ● ● ● 82 74 64 dB dB dB PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V ● 87 dB AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 1k VOUT = ±10V, RL = 500Ω VOUT = ±2.5V, RL = 500Ω VOUT = ±2.5V, RL = 150Ω VOUT = ±1V, RL = 500Ω ● ● ● ● ● 2.5 1.5 1.5 1.0 1.3 V/mV V/mV V/mV V/mV V/mV 4 ±15V ±15V ±5V ±5V ±2.5V LT1364/LT1365 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the temperature range – 40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted. (Note 9) SYMBOL PARAMETER CONDITIONS VSUPPLY VOUT Output Swing RL = 1k, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 150Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV ±15V ±15V ±5V ±5V ±2.5V ● ● ● ● ● 13.4 12.7 3.4 3.2 1.2 ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±12.7V VOUT = ±3.2V ±15V ±5V ● ● 25 21 mA mA ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V ● 50 mA SR Slew Rate AV = – 2, (Note 5) ±15V ±5V ● ● 550 180 V/µs V/µs GBW Gain Bandwidth f = 200kHz ±15V ±5V ● ● 43 30 MHz MHz Channel Separation VOUT = ±10V, RL = 500Ω ±15V ● 98 dB Supply Current Each Amplifier Each Amplifier ±15V ±5V ● ● IS 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. MIN TYP MAX UNITS 9.0 8.7 mA mA Note 6: Full power bandwidth is calculated from the slew rate measurement: FPBW = SR/2πVP. Note 7: This parameter is not 100% tested. Note 8: The LT1364C/LT1365C are guaranteed functional over the operating temperature range of –40°C to 85°C. Note 9: The LT1364C/LT1365C are guaranteed to meet specified performance from 0°C to 70°C. The LT1364C/LT1365C 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. For guaranteed I-grade parts, consult the factory. U W TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage and Temperature V+ 10 1.0 TA = 25°C ∆VOS < 1mV –0.5 125°C 25°C 6 –55°C 4 2 –1.0 INPUT BIAS CURRENT (µA) COMMON MODE RANGE (V) 8 SUPPLY CURRENT (mA) Input Bias Current vs Input Common Mode Voltage Input Common Mode Range vs Supply Voltage –1.5 –2.0 2.0 1.5 1.0 0.8 VS = ±15V TA = 25°C IB+ + IB– IB = ———— 2 0.6 0.4 0.5 0 0 5 10 15 SUPPLY VOLTAGE (±V) 20 1364/1365 G01 V– 0 5 10 15 SUPPLY VOLTAGE (±V) 20 1364/1365 G02 0.2 –15 –10 –5 0 5 10 INPUT COMMON MODE VOLTAGE (V) 15 1364/1365 G03 5 LT1364/LT1365 U W TYPICAL PERFORMANCE CHARACTERISTICS Input Bias Current vs Temperature 0.8 0.6 0.4 0.2 0 –50 en in 10 1 1 –25 0 25 50 75 TEMPERATURE (°C) 100 10 125 100 OUTPUT VOLTAGE SWING (V) 10 78 77 76 75 TA = 25°C RL = 1k –1.5 RL = 500Ω –2.0 2.0 100 RL = 500Ω 1.5 RL = 1k 1.0 0 5 10 15 SUPPLY VOLTAGE (±V) Output Short-Circuit Current vs Temperature 2.0 1.5 –40°C 1.0 Settling Time vs Output Step (Inverting) 10 8 OUTPUT STEP (V) 120 110 SOURCE 100 SINK 90 4 10mV 80 125 1364/1365 G10 6 1mV 0 –2 –4 10mV 4 1mV 0 –2 –4 10mV 1mV –6 –8 –8 –10 20 40 60 80 SETTLING TIME (ns) 100 1364/1365 G11 10mV 2 –10 0 VS = ±15V AV = –1 RF = 1k CF = 3pF 8 2 –6 100 –40°C 25°C 1364/1365 G09 VS = ±15V AV = 1 RL = 1k 6 0 25 50 75 TEMPERATURE (°C) 20 10 VS = ±5V –25 25°C –2.0 Settling Time vs Output Step (Noninverting) 130 70 –50 –1.5 1364/1365 G08 1364/1365 G07 140 85°C –1.0 85°C 0.5 – V –50 –40 –30 –20 –10 0 10 20 30 40 50 OUTPUT CURRENT (mA) – 125 VS = ±5V VIN = 100mV –0.5 –1.0 V 0 25 50 75 TEMPERATURE (°C) 10k Output Voltage Swing vs Load Current 0.5 –25 100 1k LOAD RESISTANCE (Ω) 1364/1365 G06 OUTPUT STEP (V) OPEN-LOOP GAIN (dB) 60 V+ –0.5 79 74 – 50 70 65 V+ VS = ±15V VO = ±12V RL = 1k VS = ±5V 75 Output Voltage Swing vs Supply Voltage 81 80 VS = ±15V 1364/1365 G05 Open-Loop Gain vs Temperature OUTPUT SHORT-CIRCUIT CURRENT (mA) 80 0.1 100k 1k 10k FREQUENCY (Hz) 1364/1365 G04 6 TA = 25°C OPEN-LOOP GAIN (dB) 1.0 85 OUTPUT VOLTAGE SWING (V) INPUT BIAS CURRENT (µA) VS = ±15V TA = 25°C AV = 101 RS = 100k INPUT CURRENT NOISE (pA/√Hz) 1.2 10 100 VS = ±15V IB+ + IB– IB = ———— 2 INPUT VOLTAGE NOISE (nV/√Hz) 1.4 Open-Loop Gain vs Resistive Load Input Noise Spectral Density 0 20 1mV 40 60 80 SETTLING TIME (ns) 100 1364/1365 G12 LT1364/LT1365 U W TYPICAL PERFORMANCE CHARACTERISTICS PHASE 60 AV = 100 VS = ±15V 50 GAIN GAIN (dB) 1 AV = 10 VS = ±5V 20 10 0.1 0 1M 10M FREQUENCY (Hz) 100M 100k 1M 10M FREQUENCY (Hz) 40 6 35 30 90 80 GAIN BANDWIDTH VS = ±15V 70 25 20 5 –8 0 25 50 75 TEMPERATURE (°C) 100 ±5V –4 –6 –25 ±15V –2 10 ±2.5V –10 100k 0 125 1M 10M FREQUENCY (Hz) Gain Bandwidth and Phase Margin vs Supply Voltage 100 44 PHASE MARGIN 90 42 80 40 70 38 60 36 50 34 GAIN BANDWIDTH 40 32 30 30 0 5 10 15 SUPPLY VOLTAGE (±V) 20 1364/1365 G15 POWER SUPPLY REJECTION RATIO (dB) 46 PHASE MARGIN (DEG) GAIN BANDWIDTH (MHz) 110 C = 100pF C = 50pF 3 C=0 0 –3 –6 –9 –12 –15 1M 100M Common Mode Rejection Ratio vs Frequency 120 +PSRR 80 VS = ±15V TA = 25°C – PSRR 60 40 20 0 100 100M 10M FREQUENCY (Hz) 1364/1365 G18 100 48 TA = 25°C C = 500pF 6 Power Supply Rejection Ratio vs Frequency 50 120 9 C = 1000pF 1364/1365 G17 1364/1365 G16 130 VS = ±15V TA = 25°C AV = –1 12 0 50 30 – 50 15 TA = 25°C AV = 1 RL = 1k 2 15 GAIN BANDWIDTH VS = ± 5V 100M Frequency Response vs Capacitive Load 4 60 40 1M 10M FREQUENCY (Hz) 1364/1365 G21 VOLTAGE MAGNITUDE (dB) 8 GAIN (dB) GAIN BANDWIDTH (MHz) 45 PHASE MARGIN (DEG) PHASE MARGIN VS = ±15V VS = ±5V RL = 500Ω –120 100k 100M 10 50 110 VS = ±15V RL = 1k – 90 Frequency Response vs Supply Voltage (AV = 1) PHASE MARGIN VS = ± 5V 100 –70 – 80 1364/1365 G14 Gain Bandwidth and Phase Margin vs Temperature 120 – 60 –110 1364/1365 G13 130 – 50 –100 COMMON-MODE REJECTION RATIO (dB) 100k –10 10k TA = 25°C AV = 1 VIN = 0dBm – 40 TA = 25°C AV = –1 RF = RG = 1k 0 0.01 10k – 30 40 20 AV = 1 100 60 VS = ±5V 30 – 20 80 VS = ±15V 40 120 PHASE (DEG) OUTPUT IMPEDANCE (Ω) VS = ±15V TA = 25°C 10 Crosstalk vs Frequency Gain and Phase vs Frequency 70 CROSSTALK (dB) Output Impedance vs Frequency 100 VS = ±15V TA = 25°C 100 80 60 40 20 0 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 1364/1365 G19 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 1364/1365 G20 7 LT1364/LT1365 U W TYPICAL PERFORMANCE CHARACTERISTICS Slew Rate vs Temperature Slew Rate vs Supply Voltage 2400 1800 1600 AV = –2 SR+ + SR– SR = ————— 2 1200 SLEW RATE (V/µs) 2000 1400 1200 1000 800 1600 1000 VS = ±15V 800 600 1400 1200 1000 VS = ±5V 600 400 5 10 SUPPLY VOLTAGE (±V) 200 –50 15 0 –25 0 25 50 75 TEMPERATURE (°C) 1364/1365 G22 AV = 1 AV = 1 20 15 10 5 0.0001 VS = ±15V RL = 1k AV = 1, 1% MAX DISTORTION AV = –1, 2% MAX DISTORTION 0 100k 100k DIFFERENTIAL GAIN –90 –100 100k 200k 400k 1M 2M FREQUENCY (Hz) 4M 10M 1364/1365 G28 DIFFERENTIAL PHASE (DEG) HARMONIC DISTORTION (dB) 0.1 3RD HARMONIC –80 VS = ±5V RL = 1k 2% MAX DISTORTION 1M FREQUENCY (Hz) 0 0.3 0.2 DIFFERENTIAL PHASE 0.1 0.0 Capacitive Load Handling 100 TA = 25°C VS = ±15V ±10 SUPPLY VOLTAGE (V) AV = –1 50 AV = 2 RL = 150Ω TA = 25°C ±5 10M 1364/1365 G27 DIFFERENTIAL GAIN (%) Differential Gain and Phase vs Supply Voltage 0.2 2ND HARMONIC 4 0 100k 10M –40 –70 AV = 1 6 1364/1365 G26 2nd and 3rd Harmonic Distortion vs Frequency 20 AV = –1 8 2 1M FREQUENCY (Hz) 1364/1365 G25 VS = ±15V VO = 2VP-P RL = 500Ω AV = 2 6 8 10 12 14 16 18 INPUT LEVEL (VP-P) 10 AV = –1 OUTPUT VOLTAGE (VP-P) AV = –1 1k 10k FREQUENCY (Hz) 4 Undistorted Output Swing vs Frequency (±5V) 25 OUTPUT VOLTAGE (VP-P) TOTAL HARMONIC DISTORTION (%) 30 TA = 25°C VO = 3VRMS RL = 500Ω 100 2 1364/1365 G24 Undistorted Output Swing vs Frequency (±15V) 0.01 10 0 125 1364/1365 G23 Total Harmonic Distortion vs Frequency 0.001 100 OVERSHOOT (%) 0 8 600 200 0 –60 800 400 400 200 –50 TA = 25°C VS = ±15V AV = –1 RF = RG = 1k SR+ + SR – SR = ————— 2 1800 SLEW RATE (V/µS) TA = 25°C AV = –1 RF = RG = 1k SR+ + SR– SR = ————— 2 2200 SLEW RATE (V/µs) Slew Rate vs Input Level 2000 1400 AV = 1 ±15 1364/1365 G29 0 10p 100p 1000p 0.01µ 0.1µ CAPACITIVE LOAD (F) 1µ 1364/1365 G30 LT1364/LT1365 U W TYPICAL PERFORMANCE CHARACTERISTICS Small-Signal Transient (AV = 1) Small-Signal Transient (AV = –1) 1364/1365 TA31 Small-Signal Transient (AV = –1, CL = 200pF) 1364/1365 TA33 1364/1365 TA32 Large-Signal Transient (AV = 1) Large-Signal Transient (AV = –1) 1364/1365 TA34 Large-Signal Transient (AV = 1, CL = 10,000pF) 1364/1365 TA35 1364/1365 TA36 U W U U APPLICATIONS INFORMATION Layout and Passive Components Input Considerations 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 (0.01µF to 0.1µF). For high drive current applications use low ESR bypass capacitors (1µF to 10µF tantalum). 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 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 5kΩ 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. 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 9 LT1364/LT1365 U W U U 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/µs 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., 75Ω) 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 500Ω 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 10 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 130°C/W) TJ = TA + (PD x 190°C/W) TJ = TA + (PD x 110°C/W) TJ = TA + (PD x 150°C/W) 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 70°C, VS = ±5V, RL = 150W PDMAX = (10V)(8.4mA) + (2.5V)2/150Ω = 126mW TJMAX = 70°C + (4 x 126mW)(150°C/W) = 145°C LT1364/LT1365 W W SI PLIFIED SCHE ATIC V+ R1 500Ω +IN CC RC OUT –IN C V– 1364/1365 SS01 U PACKAGE DESCRIPTION Dimension in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.300 – 0.325 (7.620 – 8.255) 0.045 – 0.065 (1.143 – 1.651) ( +0.035 0.325 –0.015 +0.889 8.255 –0.381 0.130 ± 0.005 (3.302 ± 0.127) 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) ) 0.400* (10.160) MAX 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 ± 0.003 0.100 (2.54) BSC (0.457 ± 0.076) N8 1098 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) N Package 14-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.130 ± 0.005 (3.302 ± 0.127) 0.300 – 0.325 (7.620 – 8.255) 0.045 – 0.065 (1.143 – 1.651) 0.020 (0.508) MIN 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) +0.035 0.325 –0.015 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) ( 8.255 +0.889 –0.381 ) 0.770* (19.558) MAX 0.125 (3.175) MIN 0.018 ± 0.003 (0.457 ± 0.076) 14 13 12 11 10 9 8 1 2 3 4 5 6 7 0.255 ± 0.015* (6.477 ± 0.381) 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. N14 1098 11 LT1364/LT1365 U TYPICAL APPLICATIONS Two Op Amp Instrumentation Amplifier R5 220Ω R1 10k 2MHz, 4th Order Butterworth Filter R4 10k 464Ω R2 1k 22pF 464Ω R3 1k – 1/2 LT1364 1.33k VIN – 220pF 1/2 LT1364 + – 549Ω 47pF – 1.13k 549Ω 1/2 LT1364 + VOUT – 470pF + ( R4 1 R2 R3 R2 + R3 GAIN = 1 + + + R5 R3 2 R1 R4 VOUT + + VIN 1/2 LT1364 1364/1365 TA04 ) = 102 TRIM R5 FOR GAIN TRIM R1 FOR COMMON-MODE REJECTION BW = 700kHz 1364/1365 TA01 U PACKAGE DESCRIPTION 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) 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 7 8 0.053 – 0.069 (1.346 – 1.752) 5 6 0.004 – 0.010 (0.101 – 0.254) 0°– 8° TYP 0.016 – 0.050 (0.406 – 1.270) 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 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 0.050 (1.270) BSC 1 3 2 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) 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 16 15 14 13 12 11 10 9 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 0.228 – 0.244 (5.791 – 6.197) 0.050 (1.270) BSC 0.150 – 0.157** (3.810 – 3.988) 1 2 3 4 5 6 7 8 S16 1098 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1363 70MHz, 1000V/µs Op Amp Single Version of LT1364/LT1365 LT1361/LT1362 Dual and Quad 50MHz, 800V/µs Op Amps Lower Power Version of LT1364/LT1365, VOS = 1mV, 4mA/Amplifier LT1358/LT1359 Dual and Quad 25MHz, 600V/µs Op Amps Lower Power Version of LT1364/LT1365, VOS = 0.6mV, 2mA/Amplifier LT1813 Dual 100MHz, 700V/µs Op Amps Low Voltage, Low Power LT1364/LT1365, 3mA/Amplifier 12 Linear Technology Corporation 13645fa LT/TP 0400 2K REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com LINEAR TECHNOLOGY CORPORATION 1994