LT1358/LT1359 Dual and Quad 25MHz, 600V/µs Op Amps U FEATURES DESCRIPTIO ■ The LT1358/LT1359 are dual and quad low power 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 500Ω load to ±12.5V with ±15V supplies and a 150Ω load to ±3V on ±5V supplies. The amplifiers are stable with any capacitive load making them useful in buffer applications. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 25MHz Gain Bandwidth 600V/µs Slew Rate 2.5mA Maximum Supply Current per Amplifier Unity-Gain Stable C-LoadTM Op Amp Drives All Capacitive Loads 8nV/√Hz Input Noise Voltage 600µV Maximum Input Offset Voltage 500nA Maximum Input Bias Current 120nA Maximum Input Offset Current 20V/mV Minimum DC Gain, RL=1k 115ns Settling Time to 0.1%, 10V Step 220ns Settling Time to 0.01%, 10V Step ±12.5V Minimum Output Swing into 500Ω ±3V Minimum Output Swing into 150Ω Specified at ±2.5V, ±5V, and ±15V LT1358 is Available in 8-Pin PDIP and SO Packages LT1359 is Available in 14-Pin PDIP, 14-Pin and 16-Pin SO Packages U APPLICATIO S ■ ■ ■ ■ ■ Wideband Amplifiers Buffers Active Filters Data Acquisition Systems Photodiode Amplifiers The LT1358/LT1359 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 LT1358/LT1359 see the LT1357 data sheet. For higher bandwidth devices with higher supply currents see the LT1360 through LT1365 data sheets. For lower supply current amplifiers see the LT1354 and LT1355/ LT1356 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. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO AV = –1 Large-Signal Response DAC I-to-V Converter 6pF DAC INPUTS 12 5k – 1/2 LT1358 565A-TYPE VOUT + 0.1µF 5k VOS + I OS ( 5kΩ )+ VOUT < 1LSB A VOL 135859 TA01 135859 TA02 135859fb 1 LT1358/LT1359 U W W W ABSOLUTE AXI U RATI GS (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 7) ...–40°C to 85°C Specified Temperature Range (Note 8) ....–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 U U W PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW OUT A 1 –IN A 2 8 V+ 7 OUT A 1 OUT B –IN A 2 3 V– 4 B 6 –IN B +IN A 3 5 +IN B V– 4 V+ 7 OUT B 6 –IN B 5 +IN B A A +IN A 8 B S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 190°C/ W N8 PACKAGE 8-LEAD PDIP TJMAX = 150°C, θJA = 130°C/ W ORDER PART NUMBER ORDER PART NUMBER S8 PART MARKING LT1358CN8 LT1358IN8 LT1358CS8 LT1358IS8 1358 1358I TOP VIEW TOP VIEW OUT A 1 TOP VIEW 16 OUT D OUT A 1 14 OUT D –IN A 2 –IN A 2 13 –IN D +IN A 3 +IN A 3 12 +IN D V+ 4 13 V +IN A 3 V+ 4 +IN B 5 12 +IN C V+ 4 11 –IN C +IN B 5 +IN B A D 11 V – 10 +IN C 5 –IN B 6 OUT B 7 B C –IN B 6 A B D 15 –IN D OUT A 1 14 +IN D –IN A 2 – C 9 –IN C OUT B 7 10 OUT C 8 OUT C NC 8 9 N PACKAGE 14-LEAD PDIP NC S PACKAGE 16-LEAD PLASTIC SO –IN B 6 OUT B 7 14 OUT D 13 –IN D A D 12 +IN D 11 V – 10 +IN C B C 9 –IN C 8 OUT C S PACKAGE 14-LEAD PLASTIC SO TJMAX = 150°C, θJA = 110°C/ W TJMAX = 150°C, θJA = 150°C/ W TJMAX = 150°C, θJA = 160°C/ W ORDER PART NUMBER ORDER PART NUMBER ORDER PART NUMBER LT1359CN LT1359IN LT1359CS LT1359IS LT1359CS14 LT1359IS14 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. 135859fb 2 LT1358/LT1359 ELECTRICAL CHARACTERISTICS TA = 25°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER VOS Input Offset Voltage ±15V ±5V ±2.5V IOS Input Offset Current ±2.5V to ±15V 40 120 nA IB Input Bias Current ±2.5V to ±15V 120 500 nA en Input Noise Voltage f = 10kHz ±2.5V to ±15V 8 nV/√Hz in Input Noise Current f = 10kHz ±2.5V to ±15V 0.8 pA/√Hz RIN Input Resistance VCM = ±12V ±15V 80 MΩ Input Resistance Differential ±15V 6 MΩ ±15V 3 pF 13.4 3.5 1.1 V V V CIN CONDITIONS Input Capacitance VSUPPLY Range + ±15V ±5V ±2.5V Input Voltage Range – ±15V ±5V ±2.5V Input Voltage CMRR Common Mode Rejection Ratio VCM = ±12V VCM = ±2.5V VCM = ±0.5V PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 1k VOUT = ±10V, RL = 500Ω VOUT = ±2.5V, RL = 1k VOUT = ±2.5V, RL = 500Ω VOUT = ±2.5V, RL = 150Ω VOUT = ±1V, RL = 500Ω VOUT Output Swing IOUT ±15V ±5V ±2.5V MIN 35 12.0 2.5 0.5 TYP MAX UNITS 0.2 0.2 0.3 0.6 0.6 0.8 mV mV mV –13.2 –12.0 –3.3 –2.5 –0.9 –0.5 V V V 83 78 68 97 84 75 dB dB dB 92 106 dB ±15V ±15V ±5V ±5V ±5V ±2.5V 20 7 20 7 1.5 7 65 25 45 25 6 30 V/mV V/mV V/mV V/mV V/mV V/mV 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 13.3 12.5 3.5 3.0 1.3 13.8 13.0 4.0 3.3 1.7 ±V ±V ±V ±V ±V Output Current VOUT = ±12.5V VOUT = ±3V ±15V ±5V 25 20 30 25 mA mA ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V 30 42 mA SR Slew Rate AV = – 2, (Note 4) ±15V ±5V 300 150 600 220 V/µs V/µs Full Power Bandwidth 10V Peak, (Note 5) 3V Peak, (Note 5) ±15V ±5V 9.6 11.7 MHz MHz GBW Gain Bandwidth f = 200kHz, RL = 2k ±15V ±5V ±2.5V 25 22 20 MHz MHz MHz tr, tf Rise Time, Fall Time AV = 1, 10%-90%, 0.1V ±15V ±5V 8 9 ns ns Overshoot AV = 1, 0.1V ±15V ±5V 27 27 % % Propagation Delay 50% VIN to 50% VOUT, 0.1V ±15V ±5V 9 11 ns ns Settling Time 10V Step, 0.1%, AV = –1 10V Step, 0.01%, AV = –1 5V Step, 0.1%, AV = –1 5V Step, 0.01%, AV = –1 ±15V ±15V ±5V ±5V 115 220 110 380 ns ns ns ns ts 18 15 135859fb 3 LT1358/LT1359 ELECTRICAL CHARACTERISTICS SYMBOL RO IS PARAMETER CONDITIONS VSUPPLY Differential Gain f = 3.58MHz, AV = 2, RL = 1k ±15V ±5V 0.1 0.1 % % Differential Phase f = 3.58MHz, AV = 2, RL = 1k ±15V ±5V 0.50 0.35 Deg Deg Output Resistance AV = 1, f = 100kHz ±15V 0.3 Ω Channel Separation VOUT = ±10V, RL = 500Ω ±15V Supply Current Each Amplifier Each Amplifier ±15V ±5V ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER VOS Input Offset Voltage Input VOS Drift IOS TA = 25°C, VCM = 0V unless otherwise noted. MIN 100 TYP MAX UNITS 113 2.0 1.9 dB 2.5 2.4 mA mA The ● denotes the specifications which apply over the temperature range CONDITIONS (Note 6) Input Offset Current VSUPPLY MIN TYP MAX UNITS 0.8 0.8 1.0 mV mV mV ±15V ±5V ±2.5V ● ● ● ±2.5V to ±15V ● ±2.5V to ±15V ● ±2.5V to ±15V ● ±15V ±5V ±2.5V ● ● ● 81 77 67 dB dB dB ● 90 dB V/mV V/mV V/mV V/mV V/mV V/mV 5 8 180 nA IB Input Bias Current CMRR Common Mode Rejection Ratio VCM = ±12V VCM = ±2.5V VCM = ±0.5V PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 1k VOUT = ±10V, RL = 500Ω VOUT = ±2.5V, RL = 1k VOUT = ±2.5V, RL = 500Ω VOUT = ±2.5V, RL = 150Ω VOUT = ±1V, RL = 500Ω ±15V ±15V ±5V ±5V ±5V ±2.5V ● ● ● ● ● ● 15 5 15 5 1 5 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 ● ● ● ● ● 13.2 12.2 3.4 2.8 1.2 ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±12.2V VOUT = ±2.8V ±15V ±5V ● ● 24.4 18.7 mA mA ISC Short-Circuit Current VOUT = 0V, VIN = ± 3V ±15V ● 25 mA SR Slew Rate AV = – 2, (Note 4) ±15V ±5V ● ● 225 125 V/µs V/µs GBW Gain Bandwidth f = 200kHz, RL = 2k ±15V ±5V ● ● 15 12 MHz MHz Channel Separation VOUT = ±10V, RL = 500Ω ±15V ● 98 dB Supply Current Each Amplifier Each Amplifier ±15V ±5V ● ● IS 750 µV/°C 2.9 2.8 nA mA mA 135859fb 4 LT1358/LT1359 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the temperature range – 40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted. (Note 8) SYMBOL VOS IOS PARAMETER Input Offset Voltage CONDITIONS Input VOS Drift (Note 6) Input Offset Current IB Input Bias Current CMRR Common Mode Rejection Ratio VCM = ±12V VCM = ±2.5V VCM = ±0.5V VSUPPLY ±15V ± 5V ± 2.5V MIN ● ● ● ± 2.5V to ±15V ● ± 2.5V to ±15V ● ± 2.5V to ±15V ● ±15V ± 5V ± 2.5V ● ● ● TYP 5 MAX 1.3 1.3 1.5 UNITS mV mV mV 8 µV/°C 300 900 80 76 66 nA nA dB dB dB PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V ● 90 dB AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 1k VOUT = ±10V, RL = 500Ω VOUT = ±2.5V, RL = 1k VOUT = ±2.5V, RL = 500Ω VOUT = ±2.5V, RL = 150Ω VOUT = ±1V, RL = 500Ω ±15V ±15V ±5V ±5V ±5V ±2.5V ● ● ● ● ● ● 10.0 2.5 10.0 2.5 0.6 2.5 V/mV 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 ● ● ● ● ● 13.0 12.0 3.4 2.6 1.2 ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±12V VOUT = ±2.6V ±15V ±5V ● ● 24.0 17.3 mA mA ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V ● 24 mA SR Slew Rate AV = – 2, (Note 4) ±15V ±5V ● ● 180 100 V/µs V/µs GBW Gain Bandwidth f = 200kHz, RL = 2k ±15V ±5V ● ● 14 11 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: 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. 3.0 2.9 mA mA Note 5: Full power bandwidth is calculated from the slew rate measurement: FPBW = (SR)/2πVP. Note 6: This parameter is not 100% tested. Note 7. The LT1358C/LT1359C and LT1358I/LT1359I are guaranteed functional over the operating temperature range of –40°C to 85°C. Note 8: The LT1358C/LT1359C are guaranteed to meet specified performance from 0°C to 70°C. The LT1358C/LT1359C 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 LT1358I/LT1359I are guaranteed to meet specified performance from – 40°C to 85°C. 135859fb 5 LT1358/LT1359 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage and Temperature Input Common Mode Range vs Supply Voltage V+ 3.0 400 TA = 25°C ∆VOS < 1mV –0.5 125°C 2.0 25°C –55°C 1.5 1.0 VS = ±15V TA = 25°C IB + + I B – IB = ———— 2 300 –1.0 INPUT BIAS CURRENT (nA) COMMON MODE RANGE (V) 2.5 SUPPLY CURRENT (mA) Input Bias Current vs Input Common Mode Voltage –1.5 –2.0 2.0 1.5 1.0 200 100 0 –100 0.5 V– 0 5 10 15 SUPPLY VOLTAGE (±V) 20 0 135859 G01 INPUT VOLTAGE NOISE (nV/ Hz) INPUT BIAS CURRENT (nA) 250 200 150 100 100 10 VS = ±15V TA = 25°C AV = 101 RS = 100k TA = 25°C en 10 1 in INPUT CURRENT NOISE (pA/ Hz) 300 15 Open-Loop Gain vs Resistive Load 100 ⏐ ⏐ 350 –10 –5 0 5 10 INPUT COMMON MODE VOLTAGE (V) 135859 G03 Input Noise Spectral Density VS = ±15V IB+ + IB– IB = ———— 2 400 –200 –15 20 135859 G02 Input Bias Current vs Temperature 450 5 10 15 SUPPLY VOLTAGE (±V) VS = ±15V VS = ±5V 90 OPEN-LOOP GAIN (dB) 0.5 80 70 60 50 –25 0 25 50 75 TEMPERATURE (°C) 100 10 100 1k 10k FREQUENCY (Hz) 135859 G04 –1 97 96 95 –2 –1.0 –3 3 RL = 500Ω 2 RL = 1k 0 25 50 75 TEMPERATURE (°C) 100 125 135859 G07 0 5 10 15 SUPPLY VOLTAGE (±V) VS = ±5V VIN = 100mV 85°C –40°C –1.5 –2.0 –2.5 25°C 25°C 2.5 85°C 2.0 –40°C 1.5 1.0 V– –25 135859 G06 RL = 1k RL = 500Ω 1 94 10k V + –0.5 TA = 25°C 98 100 1k LOAD RESISTANCE (Ω) Output Voltage Swing vs Load Current V+ VS = ±15V RL = 1k VO = ±12V 99 93 – 50 10 Output Voltage Swing vs Supply Voltage OUTPUT VOLTAGE SWING (V) OPEN-LOOP GAIN (dB) 100 50 135859 G05 Open-Loop Gain vs Temperature 101 0.1 100k 1 125 OUTPUT VOLTAGE SWING (V) 0 – 50 20 135859 G08 V – +0.5 –50 –40 –30 –20 –10 0 10 20 30 40 50 OUTPUT CURRENT (mA) 135859 G09 135859fb 6 LT1358/LT1359 U W TYPICAL PERFOR A CE CHARACTERISTICS Settling Time vs Output Step (Noninverting) Output Short-Circuit Current vs Temperature OUTPUT SHORT-CIRCUIT CURRENT (mA) 65 Settling Time vs Output Step (Inverting) 10 10 VS = ±5V 60 VS = ±15V AV = 1 10mV 8 8 50 45 SINK 40 SOURCE 35 1mV 4 2 0 –2 –4 0 25 50 75 TEMPERATURE (°C) 100 125 50 Gain Bandwidth and Phase Margin vs Supply Voltage 38 10 VS = ±15V TA = 25°C AV = –1 AV = 10 10 AV = 1 1 0.1 6 C = 1000pF C = 100pF 2 0 C = 50pF –2 –4 C=0 –6 4 46 3 30 42 28 40 GAIN BANDWIDTH VS = ±15V 22 20 GAIN BANDWIDTH VS = ±5V 18 – 50 –25 0 25 50 75 TEMPERATURE (°C) 24 36 100 38 36 135859 G16 2 32 30 5 10 15 SUPPLY VOLTAGE (±V) Frequency Response vs Supply Voltage (AV = –1) 5 TA = 25°C AV = 1 RL = 2k 4 3 ±15V –1 –3 32 –4 –5 100k ±5V 1 0 –1 –2 –3 ±2.5V 1M 10M FREQUENCY (Hz) TA = 25°C AV = –1 RF = RG = 2k 2 0 –2 20 135859 G15 1 34 30 125 34 GAIN BANDWIDTH 0 GAIN (dB) 44 GAIN (dB) PHASE MARGIN VS = ±5V 48 PHASE MARGIN (DEG) GAIN BANDWIDTH (MHz) 34 24 38 100M 5 50 26 40 26 Frequency Response vs Supply Voltage (AV = 1) PHASE MARGIN VS = ±15V 32 42 28 135859 G19 Gain Bandwidth and Phase Margin vs Temperature 36 30 18 1M 10M FREQUENCY (Hz) 135859 G13 38 44 20 –10 100k 100M 1M 10M FREQUENCY (Hz) 46 PHASE MARGIN 32 22 –8 100k 48 TA = 25°C 34 C = 500pF 4 50 36 GAIN BANDWIDTH (MHz) VOLTAGE MAGNITUDE (dB) 8 AV = 100 250 135859 G12 Frequency Response vs Capacitive Load VS = ±15V TA = 25°C 0.01 10k 100 150 200 SETTLING TIME (ns) PHASE MARGIN (DEG) OUTPUT IMPEDANCE (Ω) 50 250 135859 G11 Output Impedance vs Frequency 100 10mV –4 –10 100 150 200 SETTLING TIME (ns) 135859 G10 1k VS = ±15V AV = –1 0 –2 –8 10mV –10 –25 2 –6 1mV –8 25 – 50 1mV 4 1mV –6 30 OUTPUT SWING (V) OUTPUT SWING (V) 55 10mV 6 6 –4 100M 135859 G17 –5 100k ±15V ±5V ±2.5V 1M 10M FREQUENCY (Hz) 100M 135859 G18 135859fb 7 LT1358/LT1359 U W TYPICAL PERFOR A CE CHARACTERISTICS 120 VS = ±15V 40 GAIN 30 60 VS = ±5V 40 VS = ±5V 20 20 10 0 TA = 25°C AV = –1 RF = RG = 2k 0 –10 10k 100k 10M 1M FREQUENCY (Hz) POWER SUPPLY REJECTION RATIO (dB) 80 PHASE (DEG) VS = ±15V 50 GAIN (dB) 100 PHASE 120 100 +PSRR – PSRR 80 60 40 20 0 100 100M VS = ±15V TA = 25°C Slew Rate vs Supply Voltage 10k 100k 1M FREQUENCY (Hz) 10M 40 20 1k 100k 1M FREQUENCY (Hz) 10M 200 100M Slew Rate vs Input Level 1000 800 SLEW RATE (V/µs) AV = –2 SR+ + SR– SR = ————— 2 400 TA = 25°C VS = ±15V AV = –1 RF = RG = 2k SR+ + SR – SR = ————— 2 900 VS = ±15V 500 400 10k 135859 G21 Slew Rate vs Temperature SLEW RATE (V/µs) 600 60 100M 600 800 80 135859 G20 1000 TA = 25°C AV = –1 RF = RG = 2k SR+ + SR– SR = ————— 2 VS = ±15V TA = 25°C 100 0 1k 135859 G14 SLEW RATE (V/µs) COMMON-MODE REJECTION RATIO (dB) 70 60 Common Mode Rejection Ratio vs Frequency Power Supply Rejection Ratio vs Frequency Gain and Phase vs Frequency 300 200 VS = ±5V 700 600 500 400 300 200 100 100 0 0 5 10 SUPPLY VOLTAGE (±V) 0 – 50 15 0 –25 0 25 50 75 TEMPERATURE (°C) 100 135859 G22 6 8 10 12 14 16 18 INPUT LEVEL (VP-P) 20 Undistorted Output Swing vs Frequency (±5V) 10 30 AV = –1 TA = 25°C VO = 3VRMS RL = 2k AV = –1 0.001 AV = 1 AV = 1 20 15 10 5 1k 10k FREQUENCY (Hz) 100k 135859 G25 OUTPUT VOLTAGE (VP-P) 25 OUTPUT VOLTAGE (VP-P) TOTAL HARMONIC DISTORTION (%) 4 135859 G24 Undistorted Output Swing vs Frequency (±15V) 0.01 100 2 135859 G23 Total Harmonic Distortion vs Frequency 0.0001 10 0 125 VS = ±15V RL = 2k AV = 1, 1% MAX DISTORTION AV = –1, 2% MAX DISTORTION 0 100k 1M FREQUENCY (Hz) AV = 1 6 4 2 10M 135859 G26 AV = –1 8 VS = ±5V RL = 2k 2% MAX DISTORTION 0 100k 1M FREQUENCY (Hz) 10M 135859 G27 135859fb 8 LT1358/LT1359 U W TYPICAL PERFOR A CE CHARACTERISTICS 2nd and 3rd Harmonic Distortion vs Frequency Crosstalk vs Frequency VS = ±15V VO = 2VP-P RL = 2k AV = 2 – 60 –50 –60 –70 2ND HARMONIC TA = 25°C VS = ±15V TA = 25°C VIN = 0dBm RL = 500Ω AV = 1 – 50 3RD HARMONIC OVERSHOOT (%) –40 Capacitive Load Handling 100 – 40 CROSSTALK (dB) HARMONIC DISTORTION (dB) –30 – 70 – 80 – 90 AV = 1 50 AV = –1 –100 –80 –110 –90 100k 200k 400k 1M 2M FREQUENCY (Hz) 4M 10M –120 100k 1M 10M FREQUENCY (Hz) 135859 G28 Small-Signal Transient (AV = 1) 100M 135859 G31 1000p 0.01µ 0.1µ CAPACITIVE LOAD (F) 1µ 135859 G30 Small-Signal Transient (AV = –1, CL = 1000pF) 135859 G33 135859 G32 Large-Signal Transient (AV = 1, CL = 10,000pF) Large-Signal Transient (AV = –1) 135859 G34 100p 135859 G29 Small-Signal Transient (AV = –1) Large-Signal Transient (AV = 1) 0 10p 135859 G35 135859 G36 135859fb 9 LT1358/LT1359 U W U U APPLICATIO S I FOR ATIO Layout and Passive Components Input Considerations The LT1358/LT1359 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 LT1358/LT1359 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 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. Capacitive Loading The LT1358/LT1359 are stable with any capacitive load. 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. 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. 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 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. 135859fb 10 LT1358/LT1359 U W U U APPLICATIO S I FOR ATIO Circuit Operation Power Dissipation The LT1358/LT1359 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 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 LT1358/LT1359 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 LT1358/LT1359 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: 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. LT1358N8: LT1358S8: LT1359N: LT1359S: LT1359S14: 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) TJ = TA + (PD x 160°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: LT1358 in S8 at 70°C, VS = ±15V, RL = 500Ω PDMAX = (30V)(2.9mA) + (7.5V)2/500Ω = 200mW TJMAX = 70°C + (2 x 200mW)(190°C/W) = 146°C 135859fb 11 LT1358/LT1359 W W SI PLIFIED SCHE ATIC V+ R1 500Ω +IN RC OUT –IN C V– CC 135859 SS01 135859fb 12 LT1358/LT1359 U PACKAGE DESCRIPTIO Dimension in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.400* (10.160) MAX 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) ( +0.035 0.325 –0.015 8.255 +0.889 –0.381 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) ) 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 ± 0.003 (0.457 ± 0.076) 0.100 (2.54) BSC 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) 0.770* (19.558) MAX 14 13 12 11 10 9 8 1 2 3 4 5 6 7 0.255 ± 0.015* (6.477 ± 0.381) 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) ( +0.889 8.255 –0.381 ) 0.125 (3.175) MIN 0.018 ± 0.003 (0.457 ± 0.076) N14 1098 135859fb 13 LT1358/LT1359 U PACKAGE DESCRIPTIO 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) 8 7 5 6 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 3 2 4 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0°– 8° TYP 0.016 – 0.050 (0.406 – 1.270) 0.050 0.014 – 0.019 (1.270) (0.355 – 0.483) BSC TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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) 16 15 14 13 12 11 10 9 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 2 3 4 5 6 7 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0° – 8° TYP 0.016 – 0.050 (0.406 – 1.270) *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 0.014 – 0.019 (0.355 – 0.483) TYP 8 0.050 (1.270) BSC **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE S16 1098 135859fb 14 LT1358/LT1359 U PACKAGE DESCRIPTIO Dimension in inches (millimeters) unless otherwise noted. S Package 14-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .337 – .344 (8.560 – 8.738) NOTE 3 .045 ±.005 .050 BSC 14 N 13 12 11 10 9 8 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 2 3 N/2 N/2 .030 ±.005 TYP RECOMMENDED SOLDER PAD LAYOUT 1 .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 2 3 4 5 6 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) 0° – 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN .014 – .019 (0.355 – 0.483) TYP 7 .050 (1.270) BSC INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) S14 0502 135859fb 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 LT1358/LT1359 U TYPICAL APPLICATIO S Instrumentation Amplifier R5 432Ω R1 20k R4 20k R2 2k – 1/2 LT1358 R3 2k – 1/2 LT1358 + – VOUT + VIN + AV = R4 ⎡ 1 ⎛ R2 R3 ⎞ R2 + R3 ⎤ + + 1+ = 1044 R3 ⎢⎣ 2 ⎜⎝ R1 R4 ⎟⎠ R5 ⎥⎦ TRIM R5 FOR GAIN TRIM R1 FOR COMMON-MODE REJECTION BW = 250kHz 135859 TA03 200kHz, 4th Order Butterworth Filter 2.61k 3.4k 100pF 47pF 3.4k 5.62k VIN 330pF – 1/2 LT1358 + 2.61k 5.11k 1000pF – 1/2 LT1358 VOUT + 135859 TA04 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1357 25MHz, 600V/µs Op Amp Single Version of LT1358/LT1359 LT1361/LT1362 Dual and Quad 50MHz, 800V/µs Op Amps Faster Version of LT1358/LT1359, VOS = 1mV, IS = 4mA/Amplifier LT1355/LT1356 Dual and Quad 12MHz, 400V/µs Op Amps Lower Power Version of LT1358/LT1359, VOS = 0.8mV, IS = 1mA/Amplifier LT1812/LT1813/ LT1814 Single/Dual/Quad 100MHz, 750V/µs Op Amps 3.6mA/Amplifier, SOT-23, MSOP-8 and SSOP-16 Packages 135859fb 16 Linear Technology Corporation LT/LT 1005 REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2005