LT1355/LT1356 Dual and Quad 12MHz, 400V/µs Op Amps FEATURES DESCRIPTION 12MHz Gain Bandwidth 400V/µs Slew Rate n 1.25mA Maximum Supply Current per Amplifier n Unity-Gain Stable n C-Load™ Op Amp Drives All Capacitive Loads n10nV/√Hz Input Noise Voltage n 800µV Maximum Input Offset Voltage n 300nA Maximum Input Bias Current n 70nA Maximum Input Offset Current n 12V/mV Minimum DC Gain, R = 1k L n 230ns Settling Time to 0.1%, 10V Step n 280ns Settling Time to 0.01%, 10V Step n ±12V Minimum Output Swing into 500Ω n ±2.75V Minimum Output Swing into 150Ω n Specified at ±2.5V, ±5V, and ±15V The LT®1355/LT1356 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 ±12V with ±15V supplies and a 150Ω load to ±2.75V on ±5V supplies. The amplifiers are stable with any capacitive load making them useful in buffer applications. n n APPLICATIONS Wideband Amplifiers Buffers n Active Filters n Data Acquisition Systems n Photodiode Amplifiers n n The LT1355/LT1356 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 LT1355/LT1356 see the LT1354 data sheet. For higher bandwidth devices with higher supply currents see the LT1357 through LT1365 data sheets. Bandwidths of 25MHz, 50MHz, and 70MHz are available with 2mA, 4mA, and 6mA of supply current per amplifier. Singles, duals, and quads of each amplifier are available. L, LT, LTC, LTM, Linear Technology and the Linear logo 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. TYPICAL APPLICATION A V = –1 Large-Signal Response 100kHz, 4th Order Butterworth Filter 6.81k 5.23k 100pF VIN 6.81k 11.3k 330pF – 1/2 LT1355 + 47pF 5.23k 10.2k 1000pF – 1/2 LT1355 VOUT + 1355/1356 TA01 13556 TA01B 13556fc 1 LT1355/LT1356 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) LT1355C/LT1356C/LT1356I..................–40°C to 85°C LT1356H (TC)...................................... –40°C to 125°C Specified Temperature Range (Note 8) LT1355C/LT1356C.................................... 0°C to 70°C LT1356I.................................................–40°C to 85°C LT1356H (TC)...................................... –40°C to 125°C Maximum Junction Temperature .......................... 150°C Storage Temperature Range...................– 65°C to 150°C Lead Temperature (Soldering, 10 sec).................... 300°C PIN CONFIGURATION LT1355 LT1355 TOP VIEW OUT A 1 –IN A 2 +IN A 3 V– 4 8 A B TOP VIEW V+ OUT A 1 7 OUT B –IN A 2 6 –IN B +IN A 3 5 +IN B V– 4 A B 8 V+ 7 OUT B 6 –IN B 5 +IN B N8 PACKAGE 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 130°C/W TJMAX = 150°C, θJA = 190°C/W LT1356 LT1356 TOP VIEW TOP VIEW OUT A 1 –IN A 2 +IN A 3 V+ 4 +IN B 5 –IN B 6 OUT B 7 14 OUT D A D 13 –IN D 12 +IN D 11 V– B C 10 +IN C 9 –IN C 8 OUT C N PACKAGE 14-LEAD PDIP OUT A 1 –IN A 2 +IN A 3 V+ 4 +IN B 5 –IN B 6 16 OUT D A D 15 –IN D 14 +IN D 13 V– B C 12 +IN C 11 –IN C OUT B 7 10 OUT C NC 8 9 NC S PACKAGE 16-LEAD PLASTIC SO TJMAX = 150°C, θJA = 110°C/W TJMAX = 150°C, θJA = 150°C/W, θJC = 30°C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING LT1355CN8#PBF LT1355CN8#TRPBF LT1355CN8 LT1355CS8#PBF LT1355CS8#TRPBF 1355 LT1356CN#PBF LT1356CN#TRPBF LT1356CN LT1356CS#PBF LT1356CS#TRPBF LT1356CS LT1356IS#PBF LT1356IS#TRPBF LT1356S LT1356HS#PBF LT1356HS#TRPBF LT1356S Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. PACKAGE DESCRIPTION 8-Lead PDIP 8-Lead Plastic SO 14-Lead PDIP 16-Lead Plastic SO 16-Lead Plastic SO 16-Lead Plastic SO For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 2 SPECIFIED TEMPERATURE RANGE 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°C –40°C to 85°C –40°C < TC < 125°C 13556fc LT1355/LT1356 ELECTRICAL CHARACTERISTICS A = 25°C, VCM = 0V unless otherwise noted. T SYMBOL PARAMETER VOS Input Offset Voltage IOS IB en Input Noise Voltage f = 10kHz ±2.5V to ±15V 10 nV/√Hz in Input Noise Current f = 10kHz ±2.5V to ±15V 0.6 pA/√Hz RIN Input Resistance VCM = ±12V ±15V 160 MΩ Input Resistance Differential CIN CONDITIONS VSUPPLY MIN TYP MAX ±15V ±5V ±2.5V 0.3 0.3 0.4 0.8 0.8 1.0 mV mV mV Input Offset Current ±2.5V to ±15V 20 70 nA Input Bias Current ±2.5V to ±15V 80 300 nA 70 UNITS ±15V 11 MΩ Input Capacitance ±15V 3 pF Input Voltage Range+ ±15V ±5V ±2.5V 13.4 3.5 1.1 V V V Input Voltage Range– ±15V ±5V ±2.5V CMRR Common Mode Rejection Ratio VCM = ±12V VCM = ±2.5V VCM = ±0.5V ±15V ±5V ±2.5V 12.0 2.5 0.5 –13.2 –3.4 –0.9 83 78 68 97 84 75 –12.0 –2.5 –0.5 V V V dB dB dB PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V 92 106 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 12 5 12 5 1 5 36 15 36 15 4 20 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 13.3 12.0 3.5 2.75 1.3 13.8 13.0 4.0 3.3 1.7 ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±12.0V VOUT = ±2.75V ±15V ±5V 24.0 18.3 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 200 70 400 120 V/µs V/µs Full-Power Bandwidth 10V Peak (Note 5) 3V Peak (Note 5) ±15V ±5V 6.4 6.4 MHz MHz GBW Gain Bandwidth f = 200kHz, RL = 2k ±15V ±5V ±2.5V 12.0 10.5 9.0 MHz MHz MHz tr, tf Rise Time, Fall Time AV = 1, 10% to 90%, 0.1V ±15V ±5V 14 17 ns ns Overshoot AV = 1, 0.1V ±15V ±5V 20 18 % % Propagation Delay 50% VIN to 50% VOUT , 0.1V ±15V ±5V 16 19 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 230 280 240 380 ns ns ns ns ts 9.0 7.5 13556fc 3 LT1355/LT1356 ELECTRICAL CHARACTERISTICS A = 25°C, VCM = 0V unless otherwise noted. T SYMBOL PARAMETER CONDITIONS VSUPPLY MIN Differential Gain f = 3.58MHz, AV = 2, RL = 1k ±15V ±5V 2.2 2.1 % % Differential Phase f = 3.58MHz, AV = 2, RL = 1k ±15V ±5V 3.1 3.1 Deg Deg RO Output Resistance AV = 1, f = 100kHz ±15V 0.7 Ω Channel Separation VOUT = ±10V, RL = 500Ω ±15V IS Supply Current Each Amplifier Each Amplifier ±15V ±5V 100 TYP MAX 113 1.0 0.9 UNITS dB 1.25 1.20 mA mA The l denotes the specifications which apply over the temperature range 0°C ≤ TA ≤ 70°C, VCM = 0V, unless otherwise noted. SYMBOL PARAMETER VOS Input Offset Voltage Input VOS Drift CONDITIONS (Note 6) VSUPPLY MIN ±15V ±5V ±2.5V l l l ±2.5V to ±15V l TYP MAX 1.0 1.0 1.2 5 8 UNITS mV mV mV µV/°C IOS Input Offset Current ±2.5V to ±15V l 100 nA IB Input Bias Current ±2.5V to ±15V l 450 nA CMRR Common Mode Rejection Ratio ±15V ±5V ±2.5V l l l VCM = ±12V VCM = ±2.5V VCM = ±0.5V 81 77 67 dB dB dB PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V l 90 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 l l l l l l 10.0 3.3 10.0 3.3 0.6 3.3 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 l l l l l 13.2 11.5 3.4 2.5 1.2 ±V ±V ±V ±V ±V IOUT Output Current VOUT = ±11.5V VOUT = ±2.5V ±15V ±5V l l 23.0 16.7 mA mA ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V l 24 mA SR Slew Rate AV = – 2, (Note 4) ±15V ±5V l l 150 60 V/µs V/µs GBW Gain Bandwidth f = 200kHz, RL = 2k ±15V ±5V l l 7.5 6.0 MHz MHz Channel Separation VOUT = ±10V, RL = 500Ω ±15V l 98 dB Supply Current Each Amplifier Each Amplifier ±15V ±5V l l IS dB 1.45 1.40 mA mA 13556fc 4 LT1355/LT1356 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the –40°C ≤ TA ≤ 85°C and –40°C ≤ TC ≤ 125°C temperature ranges, VCM = 0V unless otherwise noted. (Note 8) SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS ±15V ±5V ±2.5V VSUPPLY l l l MIN TYP MAX 1.8 1.8 2.0 mV mV mV IOS Input Offset Current ±2.5V to ±15V l 250 nA ±2.5V to ±15V l ±15V ±5V ±2.5V l l l 80 76 66 dB dB dB l 90 dB 6.0 4.0 1.7 1.7 V/mV V/mV V/mV V/mV 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 = ±2.5V, RL = 1k VOUT = ±2.5V, RL = 500Ω VOUT = ±1V, RL = 500Ω ±15V ±5V ±5V ±2.5V l l l l VOUT Output Swing RL = 1k, VIN = ±40mV RL = 500Ω, VIN = ±40mV RL = 500Ω, VIN = ±40mV ±15V ±5V ±2.5V l l l 12.7 3.3 1.2 ±V ±V ±V IOUT Output Current VOUT = ±12.7V VOUT = ±3.3V ±15V ±5V l l 12.7 6.6 mA mA ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V l 16 mA SR Slew Rate AV = –2, (Note 4) ±15V ±5V l l 110 43 V/µs V/µs GBW Gain Bandwidth f = 200kHz, RL = 2k ±15V ±5V l l 6.0 4.6 MHz MHz Channel Separation VOUT = ±10V, RL = 500Ω ±15V l 96 dB Supply Current Each Amplifier Each Amplifier ±15V ±5V l l IS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. 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. Note 5: Full power bandwidth is calculated from the slew rate measurement: FPBW = (SR)/2πVP . 600 UNITS 1.55 1.50 nA mA mA Note 6: This parameter is not 100% tested. Note 7: The LT1355C/LT1356C/LT1356I are guaranteed functional over the operating temperature range of –40°C to 85°C. The LT1356H is guaranteed functional over the operating temperature range of –40°C to 125°C case temperature (TC). Note 8: The LT1355C/LT1356C are guaranteed to meet specified performance from 0°C to 70°C. The LT1355C/LT1356C 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 LT1356I is guaranteed to meet specified performance from –40°C to 85°C. The LT1356H is guaranteed to meet specified performance from –40°C to 125°C case temperature (TC). The parts are pulse tested at these temperatures. Internal warm-up drift must be taken into account separately. Care must be taken not to exceed the maximum junction temperature. 13556fc 5 LT1355/LT1356 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage and Temperature V+ 1.4 Input Common Mode Range vs Supply Voltage 1.0 25°C 0.8 –55°C 0.6 –1.0 INPUT BIAS CURRENT (nA) COMMON MODE RANGE (V) SUPPLY CURRENT (mA) 125°C 200 TA = 25°C ∆VOS < 1mV –0.5 1.2 Input Bias Current vs Input Common Mode Voltage –1.5 –2.0 2.0 1.5 1.0 VS = ±15V TA = 25°C IB+ + IB– IB = ———— 2 150 100 50 0 0.5 0 5 10 15 SUPPLY VOLTAGE (±V) V– 20 0 5 10 15 SUPPLY VOLTAGE (±V) 1355/1356 G01 125 100 75 50 25 0 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 in 10 1 125 en 1 100 10 95 94 93 92 91 90 88 –50 TA = 25°C –2 0 25 50 75 TEMPERATURE (°C) 100 125 1355/1356 G07 80 70 50 V+–0.5 RL = 1k –1.0 –3 3 RL = 500Ω 2 RL = 1k 10 100 1k LOAD RESISTANCE (Ω) V 0 5 10 15 SUPPLY VOLTAGE (±V) 10k Output Voltage Swing vs Load Current 85°C VS = ±5V VIN = 100mV –40°C –1.5 –2.0 –2.5 25°C 85°C 2.5 2.0 1.5 25°C –40°C 1.0 – –25 VS = ±5V 1355/1356 G06 RL = 500Ω 1 89 VS = ±15V 60 Output Voltage Swing vs Supply Voltage –1 OUTPUT VOLTAGE SWING (V) OPEN-LOOP GAIN (dB) 96 V+ VS = ±15V RL = 1k VO = ±12V TA = 25°C 1355/1356 G05 Open-Loop Gain vs Temperature 97 Open-Loop Gain vs Resistive Load 90 0.1 100k 1k 10k FREQUENCY (Hz) 1355/1356 G04 100 10 OUTPUT VOLTAGE SWING (V) INPUT VOLTAGE NOISE (nV/√Hz) 150 VS = ±15V TA = 25°C AV = 101 RS = 100k INPUT CURRENT NOISE (pA/√Hz) 175 INPUT BIAS CURRENT (nA) 100 15 1355/1356 G03 Input Noise Spectral Density VS = ±15V IB+ + IB– IB = ———— 2 –10 –5 0 5 10 INPUT COMMON MODE VOLTAGE (V) 1355/1356 G02 Input Bias Current vs Temperature 200 –50 –15 20 OPEN-LOOP GAIN (dB) 0.4 20 1355/1356 G08 – + 0.5 V –50 –40 –30 –20 –10 0 10 20 30 40 50 OUTPUT CURRENT (mA) 1355/1356 G09 13556fc 6 LT1355/LT1356 TYPICAL PERFORMANCE CHARACTERISTICS Output Short-Circuit Current vs Temperature 10 VS = ±5V 60 10 SINK 40 SOURCE 35 0 –2 –4 30 10mV –6 25 –25 0 25 50 75 TEMPERATURE (°C) 100 125 1mV 2 –8 150 200 250 SETTLING TIME (ns) 300 350 10 8 AV = 10 AV = 1 0.1 6 18 VS = ±15V TA = 25°C AV = –1 C = 1000pF 4 2 C = 100pF 0 C = 50pF –2 C=0 –4 –6 100M –10 100k 1M 10M FREQUENCY (Hz) 16 PHASE MARGIN VS = ±5V 15 5 50 4 48 3 46 14 44 13 42 GAIN BANDWIDTH VS = ±15V 12 40 11 10 9 38 GAIN BANDWIDTH VS = ±5V 8 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 44 14 42 13 40 12 38 11 34 9 32 0 5 10 15 SUPPLY VOLTAGE (±V) 5 TA = 25°C AV = 1 RL = 2k 4 3 ±15V 0 –3 34 –4 –5 100k 30 Frequency Response vs Supply Voltage (A V = –1) TA = 25°C AV = –1 RF = RG = 2k 2 1 –2 20 1355/1356 G15 Frequency Response vs Supply Voltage (A V = 1) –1 36 GAIN BANDWIDTH 10 2 36 32 125 1355/1356 G16 PHASE MARGIN (DEG) GAIN BANDWIDTH (MHz) 17 52 GAIN (dB) PHASE MARGIN VS = ±15V 46 15 8 100M 48 PHASE MARGIN 1355/1356 G19 Gain Bandwidth and Phase Margin vs Temperature 350 50 16 C = 500pF 1355/1356 G13 18 300 TA = 25°C 17 GAIN (dB) 1M 10M FREQUENCY (Hz) 150 200 250 SETTLING TIME (ns) Gain Bandwidth and Phase Margin vs Supply Voltage –8 100k 100 PHASE MARGIN (DEG) 10 0.01 10k 50 1355/1356 G12 Frequency Response vs Capacitive Load VS = ±15V TA = 25°C 1 10mV 1355/1356 G11 VOLTAGE MAGNITUDE (dB) 100 1mV –4 –10 Output Impedance vs Frequency AV = 100 0 –8 100 1mV –2 –10 50 10mV 2 –6 1355/1356 G10 1k 4 1mV GAIN BANDWIDTH (MHz) 45 6 10mV 4 OUTPUT SWING (V) 50 VS = ±15V AV = –1 8 6 55 20 –50 OUTPUT IMPEDANCE (Ω) Settling Time vs Output Step (Inverting) VS = ±15V AV = 1 8 OUTPUT SWING (V) OUTPUT SHORT-CIRCUIT CURRENT (mA) 65 Settling Time vs Output Step (Noninverting) ±5V 1 0 –1 ±5V –2 –3 ±2.5V 10M 1M FREQUENCY (Hz) –4 100M 1355/1356 G17 –5 100k ±2.5V 10M 1M FREQUENCY (Hz) ±15V 100M 1355/1356 G18 13556fc 7 LT1355/LT1356 TYPICAL PERFORMANCE CHARACTERISTICS Power Supply Rejection Ratio vs Frequency 120 PHASE 100 VS = ±15V 40 GAIN (dB) 80 GAIN 30 20 60 40 VS = ±5V PHASE (DEG) VS = ±15V 50 20 VS = ±5V 0 10 TA = 25°C AV = –1 RF = RG = 2k 0 –10 10k 100k 1M 10M FREQUENCY (Hz) 80 +PSRR –PSRR 60 40 20 0 100 100M 1k 10k 100k 1M FREQUENCY (Hz) 1355/1356 G14 200 150 VS = ±5V 50 –50 15 –25 0 25 50 75 TEMPERATURE (°C) OUTPUT VOLTAGE (VP-P) TOTAL HARMONIC DISTORTION (%) 0.0001 AV = 1 10 100 100 0 125 1k 10k FREQUENCY (Hz) 100k 1355/1356 G25 0 2 4 6 8 10 12 14 16 18 20 INPUT LEVEL (VP-P) 1355/1356 G24 Undistorted Output Swing vs Frequency (± 5V) 10 20 AV = 1 15 5 100M 200 AV = –1 25 10 10M 100 30 TA = 25°C VO = 3VRMS RL = 2k 0.001 100k 1M FREQUENCY (Hz) TA = 25°C VS = ±15V AV = –1 RF = RG = 2k SR+ + SR– SR = ————— 2 300 Undistorted Output Swing vs Frequency (± 15V) AV = –1 10k 1355/1356 G23 Total Harmonic Distortion vs Frequency 0.01 1k 400 AV = –2 SR+ + SR– SR = ————— 2 1355/1356 G22 0.1 20 Slew Rate vs Input Level SLEW RATE (V/µs) 250 100 100 5 10 SUPPLY VOLTAGE (±V) 40 500 VS = ±15V 200 0 60 1355/1356 G21 300 300 0 80 Slew Rate vs Temperature SLEW RATE (V/µs) SLEW RATE (V/µs) 400 100 0 100M 350 TA = 25°C AV = –1 RF = RG = 2k SR+ + SR– SR = ————— 2 500 10M VS = ±15V TA = 25°C 1355/1356 G20 Slew Rate vs Supply Voltage 600 120 VS = ±15V TA = 25°C OUTPUT VOLTAGE (VP-P) 60 100 POWER SUPPLY REJECTION RATIO (dB) 70 Common Mode Rejection Ratio vs Frequency COMMON MODE REJECTION RATIO (dB) Gain and Phase vs Frequency VS = ±15V RL = 5k AV = 1, 1% MAX DISTORTION AV = –1, 4% MAX DISTORTION 0 100k 1M FREQUENCY (Hz) 10M 1355/1356 G26 AV = –1 8 AV = 1 6 4 2 VS = ±5V RL = 5k AV = 1, 2% MAX DISTORTION AV = –1, 3% MAX DISTORTION 0 100k 1M FREQUENCY (Hz) 10M 1355/1356 G27 13556fc 8 LT1355/LT1356 TYPICAL PERFORMANCE CHARACTERISTICS 2nd and 3rd Harmonic Distortion vs Frequency –40 VS = ±15V VO = 2VP-P RL = 2k AV = 2 –50 –60 3RD HARMONIC –50 –60 TA = 25°C VIN = 0dBm RL = 500Ω AV = 1 –70 –80 –90 TA = 25°C VS = ±15V AV = 1 50 AV = –1 –100 2ND HARMONIC –70 Capacitive Load Handling 100 OVERSHOOT (%) –30 Crosstalk vs Frequency –40 CROSSTALK (dB) HARMONIC DISTORTION (dB) –20 –110 –80 100k 200k 400k 1M 2M FREQUENCY (Hz) 4M 10M –120 100k 1M 10M FREQUENCY (Hz) 1355/1356 G28 Small-Signal Transient (A V = 1) 100M 12556 G31 1000p 0.01µ 0.1µ CAPACITIVE LOAD (F) 1µ 1355/1356 G30 Small-Signal Transient (A V = –1, CL = 1000pF) 12556 G32 Large-Signal Transient (A V = –1) 12556 G34 100p 1355/1356 G29 Small-Signal Transient (A V = –1) Large-Signal Transient (A V = 1) 0 10p 12556 G33 Large-Signal Transient (A V = 1, CL = 10,000pF) 12556 G35 12556 G36 13556fc 9 LT1355/LT1356 APPLICATIONS INFORMATION Layout and Passive Components The LT1355/LT1356 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 LT1355/LT1356 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 LT1355/LT1356 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 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 LT1355/LT1356 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 an 800Ω 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 LT1355/LT1356 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. 13556fc 10 LT1355/LT1356 APPLICATIONS INFORMATION 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. temperature (TJ) is calculated from the ambient or case temperature (TA or TC) and power dissipation (PD) as follows: LT1355CN8: LT1355CS8: LT1356CN: LT1356CS: LT1356HS: TJ = TA + (PD • 130°C/W) TJ = TA + (PD • 190°C/W) TJ = TA + (PD • 110°C/W) TJ = TA + (PD • 150°C/W) TJ = TC + (PD • 30°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 Power Dissipation The LT1355/LT1356 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 Example: LT1356 in S16 at TA = 70°C, VS = ±15V, RL = 1k PDMAX = (30V)(1.45mA) + (7.5V)2/1kΩ = 99.8mW TJMAX = 70°C + (4 • 99.8mW)(150°C/W) = 130°C SIMPLIFIED SCHEMATIC V+ –IN R1 800Ω +IN RC C V– OUT CC 1355/1356 SS01 13556fc 11 LT1355/LT1356 PACKAGE DESCRIPTION N Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510 Rev I) .300 – .325 (7.620 – 8.255) ( +.035 .325 –.015 8.255 +0.889 –0.381 .130 ±.005 (3.302 ±0.127) .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ±.015* (6.477 ±0.381) .120 (3.048) .020 MIN (0.508) MIN .018 ±.003 .100 (2.54) BSC (0.457 ±0.076) N8 REV I 0711 NOTE: 1. DIMENSIONS ARE INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) N Package 14-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510 Rev I) .770* (19.558) MAX 14 13 12 11 10 9 8 1 2 3 4 5 6 7 .255 ±.015* (6.477 ±0.381) .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE ) .045 – .065 (1.143 – 1.651) .130 ±.005 (3.302 ±0.127) .020 (0.508) MIN .065 (1.651) TYP .120 (3.048) MIN .005 (0.127) .100 MIN (2.54) BSC .018 ±.003 (0.457 ±0.076) N14 REV I 0711 INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) 13556fc 12 LT1355/LT1356 PACKAGE DESCRIPTION S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .050 BSC .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 8 .245 MIN .160 ±.005 .010 – .020 × 45° (0.254 – 0.508) NOTE: 1. DIMENSIONS IN 5 .150 – .157 (3.810 – 3.988) NOTE 3 1 RECOMMENDED SOLDER PAD LAYOUT .053 – .069 (1.346 – 1.752) 0°– 8° TYP .016 – .050 (0.406 – 1.270) 6 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP .008 – .010 (0.203 – 0.254) 7 .014 – .019 (0.355 – 0.483) TYP 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) 2 3 4 .004 – .010 (0.101 – 0.254) .050 (1.270) BSC SO8 0303 13556fc 13 LT1355/LT1356 PACKAGE DESCRIPTION S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .386 – .394 (9.804 – 10.008) NOTE 3 .045 ±.005 .050 BSC 16 N 14 13 12 11 10 9 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 15 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 1 2 3 4 5 .053 – .069 (1.346 – 1.752) NOTE: 1. DIMENSIONS IN .014 – .019 (0.355 – 0.483) TYP 7 8 .004 – .010 (0.101 – 0.254) 0° – 8° TYP .016 – .050 (0.406 – 1.270) 6 .050 (1.270) BSC S16 0502 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) 13556fc 14 LT1355/LT1356 REVISION HISTORY REV DATE DESCRIPTION C 05/12 Added H- and I-grades (Revision history begins at Rev C) PAGE NUMBER 2, 5, 11 13556fc 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 LT1355/LT1356 TYPICAL APPLICATIONS Instrumentation Amplifier R5 432Ω R1 20k R4 20k R2 2k – 1/2 LT1355 R3 2k 1/2 LT1355 + – – VOUT + VIN + R4 1 R2 R3 R2 + R3 1 + = 104 + + R3 2 R1 R4 R5 TRIM R5 FOR GAIN TRIM R1 FOR COMMON MODE REJECTION BW = 120kHz AV = 1355/1356 TA03 100kHz, 4th Order Butterworth Filter (Sallen-Key) C4 1000pF C2 330pF – – VIN R1 2.87k + R2 26.7k 1/2 LT1355 R3 2.43k R4 15.4k C1 100pF + 1/2 LT1355 C3 68pF VOUT 1355/1356 TA04 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1354 12MHz, 400V/µs Op Amp Single Version of LT1355/LT1356 LT1352/LT1353 Dual and Quad 250µA, 3MHz, 200V/µs Op Amps Lower Power Version of LT1355/LT1356, VOS = 0.6mV, IS = 250µA/Amplifier LT1358/LT1359 Dual and Quad 25MHz, 600Vµs Op Amps Faster Version of LT1355/LT1356, VOS = 0.6mV, IS = 2mA/Amplifier 13556fc 16 Linear Technology Corporation LT 0512 REV C • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 1994