LT1358/LT1359 Dual and Quad 25MHz, 600V/µs Op Amps U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO 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 U APPLICATIO S ■ ■ ■ ■ ■ Wideband Amplifiers Buffers Active Filters Data Acquisition Systems Photodiode Amplifiers 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. 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 U TYPICAL APPLICATIO DAC I-to-V Converter AV = –1 Large-Signal Response 6pF DAC INPUTS 12 5k – 1/2 LT1358 565A-TYPE VOUT + 0.1µF 5k ( ) V V OS + IOS 5kΩ + OUT < 1LSB A VOL 1358/1359 TA01 1358/1359 TA02 1 LT1358/LT1359 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 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 W U U PACKAGE/ORDER INFORMATION TOP VIEW OUT A 1 –IN A 2 8 V+ 7 OUT B A +IN A 3 V– 4 B 6 –IN B 5 +IN B –IN A 1 –IN A 2 8 V+ 7 OUT B 6 –IN B 5 +IN B +IN A 3 V– 4 B TJMAX = 150°C, θJA = 190°C/ W 14 OUT D 1 13 –IN D 2 V+ 4 +IN B 5 6 A D ORDER PART NUMBER LT1359CN 12 +IN D 11 V – 10 +IN C B C 7 9 8 –IN C OUT C N PACKAGE 14-LEAD PDIP ORDER PART NUMBER LT1358CS8 A TJMAX = 150°C, θJA = 130°C/ W 3 OUT B OUT A S8 PACKAGE 8-LEAD PLASTIC SO +IN A –IN B LT1358CN8 TOP VIEW N8 PACKAGE 8-LEAD PDIP TOP VIEW OUT A ORDER PART NUMBER S8 PART MARKING 1358 ORDER PART NUMBER TOP VIEW OUT A 1 –IN A 2 +IN A 3 V+ 4 +IN B 5 16 OUT D 15 –IN D A D LT1359CS 14 +IN D 13 V – 12 +IN C B C –IN B 6 OUT B 7 10 OUT C NC 8 9 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 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 CIN 2 Input Capacitance CONDITIONS TA = 25°C, VCM = 0V unless otherwise noted. VSUPPLY MIN 35 TYP MAX UNITS 0.2 0.2 0.3 0.6 0.6 0.8 mV mV mV LT1358/LT1359 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER TA = 25°C, VCM = 0V unless otherwise noted. VSUPPLY MIN TYP Range + ±15V ±5V ±2.5V 12.0 2.5 0.5 13.4 3.5 1.1 Input Voltage Range – ±15V ±5V ±2.5V Input Voltage CONDITIONS VCM = ±12V VCM = ±2.5V VCM = ±0.5V MAX UNITS V V V –13.2 –12.0 –3.3 –2.5 –0.9 –0.5 V V V ±15V ±5V ±2.5V 83 78 68 97 84 75 92 106 dB 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 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 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 13.3 12.5 3.5 3.0 1.3 13.8 13.0 4.0 3.3 1.7 ±V ±V ±V ±V ±V IOUT 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 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 Channel Separation VOUT = ±10V, RL = 500Ω ±15V Supply Current Each Amplifier Each Amplifier ±15V ±5V CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V AVOL Large-Signal Voltage Gain VOUT ts RO IS 18 15 100 dB dB dB 0.3 Ω 113 dB 2.0 1.9 2.5 2.4 mA mA 3 LT1358/LT1359 ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted. SYMBOL PARAMETER VOS Input Offset Voltage Input VOS Drift The ● denotes the specifications which apply over the temperature range CONDITIONS (Note 6) VSUPPLY MIN ±15V ±5V ±2.5V ● ● ● ±2.5V to ±15V ● TYP 5 MAX UNITS 0.8 0.8 1.0 mV mV mV 8 µV/°C IOS Input Offset Current ±2.5V to ±15V ● 180 nA IB Input Bias Current ±2.5V to ±15V ● 750 nA CMRR Common Mode Rejection Ratio ±15V ±5V ±2.5V ● ● ● 81 77 67 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 ● ● ● ● ● ● 15 5 15 5 1 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 ● ● ● ● ● 13.2 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 VCM = ±12V VCM = ±2.5V VCM = ±0.5V dB dB dB 2.9 2.8 mA mA The ● denotes the specifications which apply over the temperature range – 40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted. (Note 8) SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS Input VOS Drift (Note 6) VSUPPLY ±15V ± 5V ± 2.5V ● ● ● MIN ± 2.5V to ±15V ● TYP MAX 1.3 1.3 1.5 UNITS mV mV mV 5 8 µV/°C IOS Input Offset Current ± 2.5V to ±15V ● 300 nA IB Input Bias Current ± 2.5V to ±15V ● 900 nA CMRR Common Mode Rejection Ratio VCM = ±12V VCM = ±2.5V VCM = ±0.5V ±15V ± 5V ± 2.5V ● ● ● 80 76 66 dB dB dB PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V ● 90 dB 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 PARAMETER CONDITIONS VSUPPLY 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. MIN TYP MAX UNITS 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 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. For guaranteed I-grade parts, consult the factory. U W TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage and Temperature Input Common Mode Range vs Supply Voltage V+ 3.0 2.0 25°C –55°C 1.5 1.0 300 –1.0 INPUT BIAS CURRENT (nA) COMMON MODE RANGE (V) SUPPLY CURRENT (mA) 125°C 400 TA = 25°C ∆VOS < 1mV –0.5 2.5 Input Bias Current vs Input Common Mode Voltage –1.5 –2.0 2.0 1.5 1.0 0 5 10 15 SUPPLY VOLTAGE (±V) 20 1358/1359 G01 200 100 0 –100 0.5 0.5 VS = ±15V TA = 25°C IB+ + IB– IB = ———— 2 V– 0 5 10 15 SUPPLY VOLTAGE (±V) 20 1358/1359 G02 –200 –15 –10 –5 0 5 10 INPUT COMMON MODE VOLTAGE (V) 15 1358/1359 G03 5 LT1358/LT1359 U W TYPICAL PERFORMANCE CHARACTERISTICS Input Bias Current vs Temperature 300 250 200 150 100 VS = ±15V TA = 25°C en 10 1 in INPUT CURRENT NOISE (pA/√Hz) 350 100 10 VS = ±15V TA = 25°C AV = 101 RS = 100k VS = ±5V 90 OPEN-LOOP GAIN (dB) 400 INPUT BIAS CURRENT (nA) 100 VS = ±15V IB+ + IB– IB = ———— 2 INPUT VOLTAGE NOISE (nV/√Hz) 450 Open-Loop Gain vs Resistive Load Input Noise Spectral Density 80 70 60 50 0 – 50 1 –25 0 25 50 75 TEMPERATURE (°C) 100 10 125 100 1358/1359 G04 97 96 95 3 RL = 500Ω 2 1 93 –50 – V 100 RL = 500Ω –3 94 0 25 50 75 TEMPERATURE (°C) 125 RL = 1k 0 5 10 15 SUPPLY VOLTAGE (±V) 1358/1359 G07 20 VS = ±5V 45 SINK 40 SOURCE 35 30 2 0 –2 –4 125 10mV 1mV 4 2 VS = ±15V AV = –1 0 –2 10mV –4 1mV –6 1mV –8 1358/1359 G10 6 1.5 8 1mV 4 –8 10mV –10 100 85°C – 40°C 6 –6 0 25 50 75 TEMPERATURE (°C) 2.5 2.0 10 OUTPUT SWING (V) OUTPUT SWING (V) 50 25°C 25°C Settling Time vs Output Step (Inverting) 6 –25 –2.5 1358/1359 G09 VS = ±15V AV = 1 10mV 8 60 25 –50 –2.0 Settling Time vs Output Step (Noninverting) 55 – 40°C –1.5 1.0 – V +0.5 – 50 – 40 –30 –20 –10 0 10 20 30 40 50 OUTPUT CURRENT (mA) 10 65 85°C 1358/1359 G08 Output Short-Circuit Current vs Temperature OUTPUT SHORT-CIRCUIT CURRENT (mA) OUTPUT VOLTAGE SWING (V) 98 –2 VS = ± 5V VIN = 100mV –1.0 RL = 1k –1 OUTPUT VOLTAGE SWING (V) OPEN-LOOP GAIN (dB) V + –0.5 TA = 25°C 99 10k Output Voltage Swing vs Load Current V+ VS = ±15V RL = 1k VO = ±12V 100 1k LOAD RESISTANCE (Ω) 1358/1359 G06 Output Voltage Swing vs Supply Voltage 101 –25 10 1358/1359 G05 Open-Loop Gain vs Temperature 100 50 0.1 100k 1k 10k FREQUENCY (Hz) 50 100 150 200 SETTLING TIME (ns) 250 1358/1359 G11 –10 50 100 150 200 SETTLING TIME (ns) 250 1358/1359 G12 LT1358/LT1359 U W TYPICAL PERFORMANCE CHARACTERISTICS Frequency Response vs Capacitive Load Output Impedance vs Frequency 38 VS = ±15V TA = 25°C AV = –1 8 6 AV = 10 10 AV = 1 1 0.1 C = 100pF 2 0 C = 50pF –2 –4 C=0 –6 1M 10M FREQUENCY (Hz) 1M 10M FREQUENCY (Hz) 5 48 4 46 3 42 28 40 GAIN BANDWIDTH VS = ±15V 24 22 GAIN BANDWIDTH VS = ±5V 20 18 –50 –25 0 25 50 75 TEMPERATURE (°C) 100M 38 36 –1 –3 32 –4 GAIN (dB) VS = ±15V 80 60 VS = ±5V 40 VS = ±5V 10 0 TA = 25°C AV = –1 RF = RG = 2k 1M 10M FREQUENCY (Hz) 100M 1358/1359 G14 POWER SUPPLY REJECTION RATIO (dB) VS = ±15V 100k –1 –2 ±2.5V 1M 10M FREQUENCY (Hz) 100 100 PHASE 20 –10 10k 0 ±2.5V –4 –5 100k 100M ±15V ±5V 1M 10M FREQUENCY (Hz) 1358/1359 G17 20 0 1 –3 –5 100k PHASE (DEG) 30 2 ±5V –2 120 GAIN 3 ±15V 0 34 20 TA = 25°C AV = –1 RF = RG = 2k 4 +PSRR –PSRR Common Mode Rejection Ratio vs Frequency 120 VS = ±15V TA = 25°C 80 60 40 20 0 100 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 1358/1359 G18 Power Supply Rejection Ratio vs Frequency 70 40 30 5 10 15 SUPPLY VOLTAGE (±V) 1358/1359 G15 1 Gain and Phase vs Frequency 50 32 5 TA = 25°C AV = 1 RL = 2k 2 30 125 100 34 Frequency Response vs Supply Voltage (AV = –1) 1358/1359 G16 60 36 GAIN BANDWIDTH 0 GAIN (dB) 44 30 GAIN (dB) PHASE MARGIN VS = ± 5V 50 PHASE MARGIN (DEG) GAIN BANDWIDTH (MHz) 34 26 38 24 Frequency Response vs Supply Voltage (AV = 1) PHASE MARGIN VS = ±15V 32 40 26 1358/1359 G19 Gain Bandwidth and Phase Margin vs Temperature 36 42 28 18 1358/1359 G13 38 44 30 20 –10 100k 100M 32 100M 1358/1359 G20 COMMON-MODE REJECTION RATIO (dB) 100k 46 PHASE MARGIN 22 –8 0.01 10k 48 TA = 25°C 34 C = 500pF 4 50 36 PHASE MARGIN (DEG) AV = 100 C = 1000pF GAIN BANDWIDTH (MHz) 100 OUTPUT IMPEDANCE (Ω) 10 VS = ±15V TA = 25°C VOLTAGE MAGNITUDE (dB) 1k Gain Bandwidth and Phase Margin vs Supply Voltage VS = ±15V TA = 25°C 100 80 60 40 20 0 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 1358/1359 G21 7 LT1358/LT1359 U W TYPICAL PERFORMANCE CHARACTERISTICS Slew Rate vs Supply Voltage Slew Rate vs Temperature 400 200 800 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 SLEW RATE (V/µs) 600 1000 SLEW RATE (V/µs) TA = 25°C AV = –1 RF = RG = 2k SR+ + SR– SR = ————— 2 800 SLEW RATE (V/µs) Slew Rate vs Input Level 600 1000 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) 1358/1359 G22 10 AV = 1 20 15 10 5 0.0001 VS = ±15V RL = 2k AV = 1, 1% MAX DISTORTION AV = –1, 2% MAX DISTORTION 0 100k 100k 1k 10k FREQUENCY (Hz) OUTPUT VOLTAGE (VP-P) OUTPUT VOLTAGE (VP-P) TOTAL HARMONIC DISTORTION (%) AV = 1 1M FREQUENCY (Hz) 1358/1359 G25 – 60 CROSSTALK (dB) 2ND HARMONIC 1M FREQUENCY (Hz) 10M 1358/1359 G27 Capacitive Load Handling 100 TA = 25°C VS = ±15V TA = 25°C VIN = 0dBm RL = 500Ω AV = 1 – 70 – 80 – 90 AV = 1 50 AV = –1 –100 –80 –90 100k 200k VS = ±5V RL = 2k 2% MAX DISTORTION 0 100k 10M OVERSHOOT (%) – 50 3RD HARMONIC –70 4 2 – 40 –60 AV = 1 6 Crosstalk vs Frequency –30 –50 AV = –1 8 1358/1359 G26 2nd and 3rd Harmonic Distortion vs Frequency VS = ±15V VO = 2VP-P RL = 2k AV = 2 6 8 10 12 14 16 18 20 INPUT LEVEL (VP-P) Undistorted Output Swing vs Frequency (±5V) 25 0.001 100 4 AV = –1 AV = –1 10 2 1358/1359 G24 30 TA = 25°C VO = 3VRMS RL = 2k HARMONIC DISTORTION (dB) 0 Undistorted Output Swing vs Frequency (±15V) 0.01 –110 400k 1M 2M FREQUENCY (Hz) 4M 10M 1358/1359 G28 8 125 1358/1359 G23 Total Harmonic Distortion vs Frequency –40 100 –120 100k 1M 10M FREQUENCY (Hz) 100M 1358/1359 G29 0 10p 100p 1000p 0.01µ 0.1µ CAPACITIVE LOAD (F) 1µ 1358/1359 G30 LT1358/LT1359 U W TYPICAL PERFORMANCE CHARACTERISTICS Small-Signal Transient (AV = 1) Small-Signal Transient (AV = –1) Small-Signal Transient (AV = –1, CL = 1000pF) 1358/1359 G32 1358/1359 G31 Large-Signal Transient (AV = 1) Large-Signal Transient (AV = –1) 1358/1359 G33 Large-Signal Transient (AV = 1, CL = 10,000pF) 1358/1359 G35 1358/1359 G34 1358/1359 G36 U W U U APPLICATIONS INFORMATION Layout and Passive Components 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). 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. Input Considerations 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. 9 LT1358/LT1359 U W U U APPLICATIONS INFORMATION 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 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. Circuit Operation 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 10 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 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 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: LT1358CN8: LT1358CS8: LT1359CN: LT1359CS: 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: 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 LT1358/LT1359 W W SI PLIFIED SCHE ATIC V+ R1 500Ω +IN RC OUT –IN C CC V– 1358/1359 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) ( 0.130 ± 0.005 (3.302 ± 0.127) 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) +0.035 0.325 –0.015 +0.889 8.255 –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 LT1358/LT1359 U TYPICAL APPLICATIONS 200kHz, 4th Order Butterworth Filter Instrumentation Amplifier R5 432Ω R1 20k R4 20k 3.4k R2 2k 2.61k 100pF 47pF R3 2k – 1/2 LT1358 3.4k 1/2 LT1358 + – 5.62k VIN – 330pF VOUT 5.11k 2.61k 1/2 LT1358 + + VIN – – 1000pF 1/2 LT1358 VOUT + + R4 1 R2 R3 R2 + R3 1 + = 104 + + R3 2 R1 R4 R5 TRIM R5 FOR GAIN TRIM R1 FOR COMMON-MODE REJECTION BW = 250kHz 1358/1359 TA04 AV = 1358/1359 TA03 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) 8 0.053 – 0.069 (1.346 – 1.752) 0.008 – 0.010 (0.203 – 0.254) 7 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 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 12 Linear Technology Corporation 13589fa 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