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| LT1813/LT1814 Dual/Quad 3mA, 100MHz, 750V/s Operational Amplifiers FEATURES s s s s s s s s s s s s s DESCRIPTIO 100MHz Gain Bandwidth Product 750V/s Slew Rate 3.6mA Maximum Supply Current per Amplifier 8nV/Hz Input Noise Voltage Unity-Gain Stable 1.5mV Maximum Input Offset Voltage 4A Maximum Input Bias Current 400nA Maximum Input Offset Current 40mA Minimum Output Current, VOUT = 3V 3.5V Minimum Input CMR, VS = 5V 30ns Settling Time to 0.1%, 5V Step Specified at 5V, Single 5V Supplies Operating Temperature Range: -40C to 85C The LT(R)1813/LT1814 are dual and quad, low power, high speed, very high slew rate operational amplifiers with excellent DC performance. The LT1813/LT1814 feature reduced supply current, lower input offset voltage, lower input bias current and higher DC gain than other devices with comparable bandwidth. The circuit topology is a voltage feedback amplifier with the slewing characteristics of a current feedback amplifier. The output drives a 100 load to 3.5V with 5V supplies. On a single 5V supply, the output swings from 1.1V to 3.9V with a 100 load connected to 2.5V. The amplifiers are stable with a 1000pF capacitive load making them useful in buffer and cable driver applications. The LT1813/LT1814 are manufactured on Linear Technology's advanced low voltage complementary bipolar process. The LT1813 dual op amp is available in the 8-pin MSOP and SO packages. The quad LT1814 is available in the 14-pin SO and 16-pin SSOP package. A single version, the LT1812, is also available (see separate data sheet). , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S s s s s s s s Active Filters Wideband Amplifiers Buffers Video Amplification Communication Receivers Cable Drivers Data Acquisition Systems TYPICAL APPLICATIO Bandpass Filter with Independently Settable Gain, Q and fC R1 R C 1/4 LT1814 1/4 LT1814 GAIN = R1 RG Q = R1 RQ fC = 1 2RFC R C 1/4 LT1814 + - - + + - R RF 1/4 LT1814 BANDPASS OUT RF OUTPUT MAGNITUDE (6dB/DIV) VIN + - RG RQ 1814 TA01 U Filter Frequency Response 0 R = 499 R1 = 499 RF = 475 RQ = 49.9 RG = 499 C = 3.3nF fC = 100kHz Q = 10 GAIN = 1 VS = 5V VIN = 5VP-P DISTORTION: 2nd < -76dB 3rd < -90dB ACROSS FREQ RANGE 1k 10k 100k 1M FREQUENCY (Hz) 10M 1814 TA02 U U 1 LT1813/LT1814 ABSOLUTE AXI U RATI GS (Note 1) Operating Temperature Range ................ - 40C to 85C Specified Temperature Range (Note 8) .. - 40C to 85C Maximum Junction Temperature ......................... 150C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C Total Supply Voltage (V+ to V -) LT1813/LT1814 ................................................ 12.6V LT1813HV ........................................................ 13.5V Differential Input Voltage (Transient Only, Note 2) .. 6V Input Voltage ............................................................ VS Output Short-Circuit Duration (Note 3) ........... Indefinite PACKAGE/ORDER I FOR ATIO TOP VIEW MS8 PACKAGE 8-LEAD PLASTIC MSOP V- 4 B 5 +IN B -IN B 6 OUT B 7 TJMAX = 150C, JA = 250C/W S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150C, JA = 150C/W S PACKAGE 14-LEAD PLASTIC SO TJMAX = 150C, JA = 110C/W ORDER PART NUMBER LT1813DMS8* MS8 PART MARKING LTGZ ORDER PART NUMBER LT1813DS8* LT1813CS8 LT1813IS8 LT1813HVDS8* LT1813HVCS8 LT1813HVIS8 S8 PART MARKING 1813D 1813 1813I 813HVD 1813HV 813HVI ORDER PART NUMBER LT1814CS LT1814IS Consult LTC marketing for parts specified with wider operating temperature ranges. *See Note 9. ELECTRICAL CHARACTERISTICS SYMBOL VOS PARAMETER Input Offset Voltage The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, VCM = 0V, unless otherwise noted. (Note 8) CONDITIONS (Note 4) TA = 0C to 70C TA = - 40C to 85C TA = 0C to 70C (Note 7) TA = - 40C to 85C (Note 7) TA = 0C to 70C TA = - 40C to 85C IB Input Bias Current TA = 0C to 70C TA = - 40C to 85C en in Input Noise Voltage Density Input Noise Current Density f = 10kHz f = 10kHz q q q q q q q q VOS T IOS Input Offset Voltage Drift Input Offset Current 2 - + +IN A 3 6 -IN B +IN B 5 B C + 10 +IN C - 9 -IN C -IN B 6 OUT B 7 NC 8 8 OUT C TJMAX = 150C, JA = 135C/W GN PACKAGE 16-LEAD PLASTIC SSOP ORDER PART NUMBER LT1814CGN LT1814IGN GN PART MARKING 1814 1814I MIN TYP 0.5 10 10 50 - 0.9 8 1 - + OUTA -IN A +IN A V- 1 2 3 4 8 7 6 5 V+ OUT B -IN B +IN B OUT A 1 -IN A 2 A 8 V+ 7 OUT B +IN A 3 V+ 4 - A + D + - TOP VIEW -IN A 2 13 -IN D 12 +IN D 11 V - +IN A 3 V+ 4 +IN B 5 - A + D B + 12 +IN C C- 11 + - U U W WW U W TOP VIEW OUT A 1 14 OUT D OUT A 1 -IN A 2 TOP VIEW 16 OUT D 15 -IN D 14 +IN D 13 V - -IN C 10 OUT C 9 NC MAX 1.5 2 3 15 30 400 500 600 4 5 6 UNITS mV mV mV V/C V/C nA nA nA A A A nV/Hz pA/Hz LT1813/LT1814 ELECTRICAL CHARACTERISTICS SYMBOL RIN CIN VCM CMRR PARAMETER Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, VCM = 0V, unless otherwise noted. (Note 8) CONDITIONS VCM = 3.5V Differential Guaranteed by CMRR TA = -40C to 85C VCM = 3.5V TA = 0C to 70C TA = - 40C to 85C Guaranteed by PSRR TA = -40C to 85C VS = 2V to 5.5V TA = 0C to 70C TA = - 40C to 85C VS = 2V to 6.5V (LT1813HV) TA = 0C to 70C TA = - 40C to 85C AVOL Large-Signal Voltage Gain VOUT = 3V, RL = 500 TA = 0C to 70C TA = - 40C to 85C VOUT = 3V, RL = 100 TA = 0C to 70C TA = - 40C to 85C VOUT Maximum Output Swing (Positive/Negative) RL = 500, 30mV Overdrive TA = 0C to 70C TA = - 40C to 85C RL = 100, 30mV Overdrive TA = 0C to 70C TA = - 40C to 85C IOUT Maximum Output Current VOUT = 3V, 30mV Overdrive TA = 0C to 70C TA = - 40C to 85C VOUT = 0V, 1V Overdrive (Note 3) TA = 0C to 70C TA = - 40C to 85C AV = -1 (Note 5) TA = 0C to 70C TA = - 40C to 85C 6VP-P (Note 6) f = 200kHz, RL = 500 TA = 0C to 70C TA = - 40C to 85C AV = 1, RL = 500 AV = 1, 10% to 90%, 0.1V, RL = 100 AV = 1, 50% to 50%, 0.1V, RL = 100 AV = 1, 0.1V, RL = 100 AV = -1, 0.1%, 5V AV = 2, f = 1MHz, VOUT = 2VP-P, RL = 500 AV = 2, VOUT = 2VP-P, RL = 150 q q MIN 3 TYP 10 1.5 2 4.2 85 MAX UNITS M M pF V V dB dB dB q q q q q q q q q q q q q q 3.5 3.5 75 73 72 Minimum Supply Voltage PSRR Power Supply Rejection Ratio 1.25 78 76 75 75 73 72 1.5 1.0 0.8 1.0 0.7 0.6 3.8 3.7 3.6 3.35 97 2 2 V V dB dB dB dB dB dB V/mV V/mV V/mV V/mV V/mV V/mV V V V V V V mA mA mA mA mA mA V/s V/s V/s MHz MHz MHz MHz MHz ns ns % ns dB % 97 3 2.5 4 q 3.25 q 3.15 q q q q q q 3.5 40 35 30 75 60 55 500 400 350 75 65 60 60 ISC Output Short-Circuit Current 100 SR Slew Rate 750 FPBW GBW Full Power Bandwidth Gain Bandwidth Product 40 100 -3dB BW tr, tf tPD OS tS THD dG -3dB Bandwidth Rise Time, Fall Time Propagation Delay (Note 10) Overshoot Settling Time Total Harmonic Distortion Differential Gain 200 2 2.8 25 30 -76 0.12 3 LT1813/LT1814 ELECTRICAL CHARACTERISTICS SYMBOL dP ROUT PARAMETER Differential Phase Output Resistance Channel Separation The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, VCM = 0V, unless otherwise noted. (Note 8) CONDITIONS AV = 2, VOUT = 2VP-P, RL = 150 AV = 1, f = 1MHz VOUT = 3V, RL = 100 TA = 0C to 70C TA = - 40C to 85C Per Amplifier TA = 0C to 70C TA = - 40C to 85C Per Amplifier,VS = 6.5V, (LT1813HV only) TA = 0C to 70C TA = - 40C to 85C q q q q q q MIN TYP 0.07 0.4 MAX UNITS DEG dB dB dB 82 81 80 100 IS Supply Current 3 3.6 4.5 5.0 4.0 5.0 5.5 mA mA mA mA mA mA The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, VCM = 2.5V, RL to 2.5V, unless otherwise noted. (Note 8) VOS Input Offset Voltage (Note 4) TA = 0C to 70C TA = - 40C to 85C TA = 0C to 70C (Note 7) TA = - 40C to 85C (Note 7) TA = 0C to 70C TA = - 40C to 85C IB Input Bias Current TA = 0C to 70C TA = - 40C to 85C en in RIN CIN VCM Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range (Positive) Input Voltage Range (Negative) CMRR Common Mode Rejection Ratio Guaranteed by CMRR TA = -40C to 85C Guaranteed by CMRR TA = -40C to 85C VCM = 1.5V to 3.5V TA = 0C to 70C TA = - 40C to 85C Guaranteed by PSRR TA = -40C to 85C VOUT = 1.5V to 3.5V, RL = 500 TA = 0C to 70C TA = - 40C to 85C VOUT = 1.5V to 3.5V, RL = 100 TA = 0C to 70C TA = - 40C to 85C q q q q q q q q q q q 0.7 q q q q q q 2.0 2.5 3.5 15 30 400 500 600 4 5 6 mV mV mV V/C V/C nA nA nA A A A nV/Hz pA/Hz M M pF V V VOS T IOS Input Offset Voltage Drift Input Offset Current 10 10 50 -1 f = 10kHz f = 10kHz VCM = 3.5V Differential 3 8 1 10 1.5 2 3.5 3.5 4.2 0.8 73 71 70 82 1.5 1.5 V V dB dB dB Minimum Supply Voltage AVOL Large-Signal Voltage Gain 2.5 1.0 0.7 0.6 0.7 0.5 0.4 2 4 4 V V V/mV V/mV V/mV V/mV V/mV V/mV 1.5 4 LT1813/LT1814 ELECTRICAL CHARACTERISTICS SYMBOL VOUT PARAMETER Maximum Output Swing (Positive) The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, VCM = 2.5V, RL to 2.5V, unless otherwise noted. (Note 8) CONDITIONS RL = 500, 30mV Overdrive TA = 0C to 70C TA = - 40C to 85C RL = 100, 30mV Overdrive TA = 0C to 70C TA = - 40C to 85C Maximum Output Swing (Negative) RL = 500, 30mV Overdrive TA = 0C to 70C TA = - 40C to 85C RL = 100, 30mV Overdrive TA = 0C to 70C TA = - 40C to 85C IOUT Maximum Output Current VOUT = 1.5V or 3.5V, 30mV Overdrive TA = 0C to 70C TA = - 40C to 85C VOUT = 2.5V, 1V Overdrive (Note 3) TA = 0C to 70C TA = - 40C to 85C AV = -1 (Note 5) TA = 0C to 70C TA = - 40C to 85C 2VP-P (Note 6) f = 200kHz, RL = 500 TA = 0C to 70C TA = - 40C to 85C AV = 1, RL = 500 AV = 1, 10% to 90%, 0.1V, RL = 100 AV = 1, 50% to 50%, 0.1V, RL = 100 AV = 1, 0.1V, RL = 100 AV = -1, 0.1%, 2V AV = 2, f = 1MHz, VOUT = 2VP-P, RL = 500 AV = 2, VOUT = 2VP-P, RL = 150 AV = 2, VOUT = 2VP-P, RL = 150 AV = 1, f = 1MHz VOUT = 1.5V to 3.5V, RL = 100 TA = 0C to 70C TA = - 40C to 85C Per Amplifier TA = 0C to 70C TA = - 40C to 85C q q q q q q q q q q q q MIN 3.9 3.8 3.7 3.7 3.6 3.5 TYP 4.1 MAX UNITS V V V V V V 3.9 0.9 1.1 1.2 1.3 1.3 1.4 1.5 V V V V V V mA mA mA mA mA mA V/s V/s V/s MHz MHz MHz MHz MHz ns ns % ns dB % DEG dB dB dB 1.1 q q q q q q q q 25 20 17 55 45 40 200 150 125 65 55 50 35 ISC Output Short-Circuit Current 75 SR Slew Rate 350 FPBW GBW Full Power Bandwidth Gain Bandwidth Product 55 94 -3dB BW tr, tf tPD OS tS THD dG dP ROUT -3dB Bandwidth Rise Time, Fall Time Propagation Delay (Note 10) Overshoot Settling Time Total Harmonic Distortion Differential Gain Differential Phase Output Resistance Channel Separation 180 2.1 3 25 30 -75 0.22 0.21 0.45 81 80 79 100 IS Supply Current 2.9 4.0 5.0 5.5 mA mA mA 5 LT1813/LT1814 ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: Differential inputs of 6V are appropriate for transient operation only, such as during slewing. Large sustained differential inputs can cause excessive power dissipation and may damage the part. 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 2V at the output with 3V input for 5V supplies and 2VP-P at the output with a 3VP-P input for single 5V supplies. Note 6: Full power bandwidth is calculated from the slew rate: FPBW = SR/2VP Note 7: This parameter is not 100% tested Note 8: The LT1813C/LT1814C are guaranteed to meet specified performance from 0C to 70C and is designed, characterized and expected to meet the extended temperature limits, but is not tested at -40C and 85C. The LT1813I/LT1814I are guaranteed to meet the extended temperature limits. Note 9: The LT1813D is 100% production tested at 25C. It is designed, characterized and expected to meet the 0C to 70C specifications although it is not tested or QA sampled at these temperatures. The LT1813D is guaranteed functional from -40C to 85C but may not meet those specifications. Note 10: Propagation delay is measured from the 50% point on the input waveform to the 50% point on the output waveform. TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Temperature 5 PER AMPLIFIER V+ - 0.5 INPUT COMMON MODE RANGE (V) INPUT BIAS CURRENT (A) 4 SUPPLY CURRENT (mA) VS = 5V 3 VS = 2.5V 2 1 0 -50 -25 50 25 0 75 TEMPERATURE (C) Input Bias Current vs Temperature - 0.6 - 0.7 VS = 5V INPUT VOLTAGE NOISE (nV/Hz) INPUT BIAS CURRENT (A) OPEN-LOOP GAIN (dB) - 0.8 - 0.9 -1.0 -1.1 -1.2 - 50 - 25 50 25 75 0 TEMPERATURE (C) 6 UW 100 1813/14 G01 Input Common Mode Range vs Supply Voltage 0 Input Bias Current vs Common Mode Voltage TA = 25C VS = 5V -1.0 -1.5 - 2.0 TA = 25C VOS < 1mV 2.0 1.5 1.0 0.5 V- - 0.5 -1.0 -1.5 125 0 1 4 3 2 5 SUPPLY VOLTAGE ( V) 6 7 - 2.0 - 5.0 0 2.5 - 2.5 INPUT COMMON MODE VOLTAGE (V) 5.0 1813/14 G02 1813/14 G03 Input Noise Spectral Density 100 TA = 25C VS = 5V AV = 101 RS = 10k 10 Open-Loop Gain vs Resistive Load 75.0 INPUT CURRENT NOISE (pA/Hz) 72.5 70.0 VS = 5V 67.5 VS = 2.5V 65.0 62.5 60 100 TA = 25C in 10 en 1 100 125 1 10 100 1k 10k FREQUENCY (Hz) 0.1 100k 1813/14 G05 1k LOAD RESISTANCE () 10k 1813/14 G06 1813/14 G04 LT1813/LT1814 TYPICAL PERFOR A CE CHARACTERISTICS Open-Loop Gain vs Temperature 75.0 72.5 OPEN-LOOP GAIN (dB) VS = 5V VO = 3V OUTPUT VOLTAGE SWING (V) -1.0 -1.5 - 2.0 RL = 100 OUTPUT VOLTAGE SWING (V) 70.0 67.5 65.0 62.5 60.0 -50 -25 RL = 500 RL = 100 50 25 75 0 TEMPERATURE (C) Output Short-Circuit Current vs Temperature 120 OUTPUT SHORT-CIRCUIT CURRENT (mA) VS = 5V SOURCE OUTPUT IMPEDANCE () 110 OUTPUT STEP (V) 100 SINK 90 80 -50 -25 75 0 25 50 TEMPERATURE (C) Gain and Phase vs Frequency 70 60 50 GAIN PHASE TA = 25C AV = -1 RF = RG = 500 120 100 80 60 2.5V 2.5V 20 10 0 -10 10k 100k 1M 10M FREQUENCY (Hz) 100M 5V 20 0 -20 -40 1000M 5V 40 CROSSTALK (dB) GAIN BANDWIDTH (MHz) GAIN (dB) 40 30 UW 100 1813/14 G07 Output Voltage Swing vs Supply Voltage V+ - 0.5 TA = 25C VIN = 30mV Output Voltage Swing vs Load Current V+ - 0.5 -1.0 -1.5 - 2.0 VS = 5V VIN = 30mV 85C 25C - 40C RL = 500 2.0 1.5 1.0 0.5 RL = 500 0 1 4 3 2 5 SUPPLY VOLTAGE ( V) 6 7 RL = 100 2.0 1.5 1.0 0.5 V- -60 -40 0 20 40 -20 OUTPUT CURRENT (mA) 60 125 V- 1813/14 G02 1813/14 G09 Settling Time vs Output Step 5 4 3 2 1 0 -1 -2 -3 -4 -5 VS = 5V AV = -1 RF = 500 CF = 3pF 0.1% SETTLING 0 5 20 15 10 25 SETTLING TIME (ns) 30 35 Output Impedance vs Frequency 100 AV = 100 AV = 10 1 AV = 1 10 0.1 0.01 TA = 25C VS = 5V 100k 1M 10M FREQUENCY (Hz) 100M 1813/14 G12 100 125 0.001 10k 1813/14 G10 1813/14 G11 Crosstalk vs Frequency 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 100k 1M 10M 100M FREQUENCY (Hz) 1000M 1813/14 G14 Gain Bandwidth and Phase Margin vs Temperature 115 RL = 500 GBW VS = 5V GBW VS = 2.5V TA = 25C AV = 10 VIN = 0dBm RL = 100 105 PHASE MARGIN (DEG) PHASE (DEG) 95 85 PHASE MARGIN VS = 5V PHASE MARGIN VS = 2.5V 40 38 -50 -25 50 25 0 75 TEMPERATURE (C) 100 36 125 1813/14 G13 1813/14 G15 7 LT1813/LT1814 TYPICAL PERFOR A CE CHARACTERISTICS Frequency Response vs Supply Voltage, AV = 1 6 4 TA = 25C AV = 1 NO RL VS = 2.5V 8 6 VOLTAGE MAGNITUDE (dB) VOLTAGE MAGNITUDE (dB) VOLTAGE MAGNITUDE (dB) 2 0 -2 -4 -6 -8 -10 -12 VS = 5V -14 1M 10M 100M FREQUENCY (Hz) Gain Bandwidth and Phase Margin vs Supply Voltage 110 POWER SUPPLY REJECTION RATIO (dB) 80 +PSRR 60 COMMON MODE REJECTION RATIO (dB) TA = 25C GBW RL = 500 GAIN BANDWIDTH (MHz) 90 GBW RL = 100 70 PHASE MARGIN RL = 100 40 PHASE MARGIN RL = 500 0 1 5 4 3 SUPPLY VOLTAGE (V) 2 6 7 45 Slew Rate vs Supply Voltage 1000 TA =25C 900 AV = -1 /2 V =V 800 RIN= R S(TOTAL)500 F G = RL = 700 600 500 400 300 200 100 0 0 1 4 3 2 5 SUPPLY VOLTAGE (V) 6 7 SR SLEW RATE (V/s) SLEW RATE (V/s) SLEW RATE (V/s) 8 UW 1813/14 G16 1813/14 G19 Frequency Response vs Supply Voltage, AV = 2 12 TA = 25C AV = 2 RL = 100 Frequency Response vs Capacitive Load, AV = -1 TA = 25C AV = -1 V = 5V 8S RF = RG = 500 NO RL 4 CL= 1000pF CL= 500pF CL= 200pF CL= 100pF CL= 50pF CL= 0 4 2 VS = 2.5V 0 -2 -4 -6 1M VS = 5V 0 -4 -8 10M 100M FREQUENCY (Hz) 500M 1813/14 G17 500M 1 10M FREQUENCY (Hz) 100M 200M 1813/14 G18 Power Supply Rejection Ratio vs Frequency 100 TA = 25C AV = 1 VS = 5V -PSRR 100 Common Mode Rejection Ratio vs Frequency TA = 25C VS = 5V 80 PHASE MARGIN (DEG) 60 40 40 20 20 35 0 1k 10k 1M 100k FREQUENCY (Hz) 10M 100M 0 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 1813/14 G20 1813/14 G21 Slew Rate vs Supply Voltage 450 1200 Slew Rate vs Input Level TA =25C AV = -1 V = 5V 1000 RS = R = R = 500 F G L 800 SR - 600 + SR - TA =25C AV = -1 V = 1V 400 RIN= R = R = 500 F G L 350 SR + 300 SR - SR + 250 400 200 0 1 4 3 2 5 SUPPLY VOLTAGE (V) 6 7 200 0 1 2 4 3 5 6 INPUT LEVEL (VP-P) 7 8 1813/14 G22 1813/14 G23 1813/14 G24 LT1813/LT1814 TYPICAL PERFOR A CE CHARACTERISTICS Slew Rate vs Temperature TOTAL HARMONIC DISTORTION + NOISE (%) 1100 1000 900 SLEW RATE (V/s) SR + VS = 5V 800 700 600 500 400 300 200 -50 SR - VS = 2.5V SR + VS = 2.5V -25 0.005 AV = 1 OUTPUT VOLTAGE (VP-P) SR - VS = 5V 0 75 25 50 TEMPERATURE (C) 2nd and 3rd Harmonic Distortion vs Frequency -30 -40 AV = 2 VS = 5V VO = 2VP-P 2ND HARMONIC RL = 100 3RD HARMONIC RL = 100 HARMONIC DISTORTION (dB) DIFFERENTIAL PHASE (DEG) OVERSHOOT (%) -50 -60 -70 -80 -90 3RD HARMONIC RL = 500 2ND HARMONIC RL = 500 1M FREQUENCY (Hz) 10M 1813/14 G28 -100 100k Small-Signal Transient (AV = 1) UW 100 1813/14 G25 1813/14 G31 Total Harmonic Distortion + Noise vs Frequency 0.01 Undistorted Output Swing vs Frequency 9 8 AV = - 1 AV = 1 AV = -1 7 6 5 4 3 2 1 0.002 TA = 25C VS = 5V VO = 2VP-P RL = 500 10 100 1k 10k FREQUENCY (Hz) 100k 1813/14 G26 0.001 125 0 100k VS = 5V RL = 100 2% MAX DISTORTION 1M 10M FREQUENCY (Hz) 100M 1813/14 G27 Differential Gain and Phase vs Supply Voltage 0.5 DIFFERENTIAL GAIN RL = 150 DIFFERENTIAL GAIN RL = 1k 0.5 0.4 0.3 0.2 0.1 0 4 10 8 6 TOTAL SUPPLY VOLTAGE (V) 12 1813/14 G29 Capacitive Load Handling 100 90 80 0.4 0.3 DIFFERENTIAL GAIN (%) 0.2 0.1 0 TA = 25C VS = 5V AV = 1 70 60 50 40 30 20 10 0 10 DIFFERENTIAL PHASE RL = 150 DIFFERENTIAL PHASE RL = 1k AV = -1 100 1000 CAPACITIVE LOAD (pF) 10000 1813/14 G30 Small-Signal Transient (AV = -1) Small-Signal Transient (AV = 1, CL = 100pF) 1813/14 G32 1813/14 G33 9 LT1813/LT1814 TYPICAL PERFOR A CE CHARACTERISTICS Large-Signal Transient (AV = 1) Large-Signal Transient (AV = -1) Large-Signal Transient (AV = -1, CL = 200pF) APPLICATIO S I FOR ATIO Layout and Passive Components The LT1813/LT1814 amplifiers are more tolerant of less than ideal board layouts than other high speed amplifiers. For optimum performance, a ground plane is recommended and trace lengths should be minimized, especially on the negative input lead. Low ESL/ESR bypass capacitors should be placed directly at the positive and negative supply pins (0.01F ceramics are recommended). For high drive current applications, additional 1F to 10F tantalums should be added. The parallel combination of the feedback resistor and gain setting resistor on the inverting input combine with the input capacitance to form a pole that can cause peaking or even oscillations. If feedback resistors greater than 1k are used, a parallel capacitor of value: CF > RG * CIN/RF should be used to cancel the input pole and optimize dynamic performance. For applications where the DC noise gain is 1 and a large feedback resistor is used, CF should be greater than or equal to CIN. An example would be an I-to-V converter. Input Considerations The inputs of the LT1813/LT1814 amplifiers are connected to the base of an NPN and PNP bipolar transistor in parallel. The base currents are of opposite polarity and provide first order bias current cancellation. Due to 10 U W UW 1813/14 G34 1813/14 G35 1813/14 G36 UU variation in the matching of NPN and PNP beta, the polarity of the input bias current can be positive or negative. The offset current, however, does not depend on beta matching and is tightly controlled. Therefore, the use of balanced source resistance at each input is recommended for applications where DC accuracy must be maximized. For example, with a 100 source resistance at each input, the 400nA maximum offset current results in only 40V of extra offset, while without balance the 4A maximum input bias current could result in a 0.4mV offset contribution. The inputs can withstand differential input voltages of up to 6V without damage and without needing clamping or series resistance for protection. This differential input voltage generates a large internal current (up to 40mA), which results in the high slew rate. In normal transient closed-loop operation, this does not increase power dissipation significantly because of the low duty cycle of the transient inputs. Sustained differential inputs, however, will result in excessive power dissipation and therefore this device should not be used as a comparator. Capacitive Loading The LT1813/LT1814 are stable with capacitive loads from 0pF to 1000pF, which is outstanding for a 100MHz amplifier. The internal compensation circuitry accomplishes this by sensing the load induced output pole and adding compensation at the amplifier gain node as needed. As the capacitive load increases, both the bandwidth and phase LT1813/LT1814 APPLICATIO S I FOR ATIO margin decrease so there will be peaking in the frequency domain and ringing 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 (e.g., 75) should be placed in series with the output. The receiving end of the cable should be terminated with the same value resistance to ground. Slew Rate The slew rate of the LT1813/LT1814 is proportional to the differential input voltage. Highest slew rates are therefore seen in the lowest gain configurations. For example, a 5V output step in a gain of 10 has a 0.5V input step, whereas in unity gain there is a 5V input step. The LT1813/LT1814 is tested for a slew rate in a gain of - 1. Lower slew rates occur in higher gain configurations. Power Dissipation The LT1813/LT1814 combine two or four amplifiers with high speed and large output drive in a small package. It is possible to exceed the maximum junction temperature specification under certain conditions. Maximum junction temperature (TJ) is calculated from the ambient temperature (TA) and power dissipation (PD) as follows: TJ = TA + (PD * JA) Power dissipation is composed of two parts. The first is due to the quiescent supply current and the second is due to on-chip dissipation caused by the load current. The worst-case load induced power occurs when the output voltage is at 1/2 of either supply voltage (or the maximum swing if less than 1/2 the supply voltage). Therefore PDMAX is: PDMAX = (V+ - V-) * (ISMAX) + (V+/2)2/RL or PDMAX = (V+ - V-) * (ISMAX) + (V+ - VOMAX) * (VOMAX/RL) U Example: LT1814S at 70C, VS = 5V, RL=100 PDMAX = (10V) * (4.5mA) + (2.5V)2/100 = 108mW TJMAX = 70C + (4 * 108mW) * (100C/W) = 113C Circuit Operation The LT1813/LT1814 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. Complementary NPN and PNP emitter followers buffer the inputs and drive an internal resistor. The input voltage appears across the resistor, generating current that is mirrored into the high impedance node. Complementary followers form an output stage that buffers the gain node from the load. The input resistor, input stage transconductance, and the capacitor on the high impedance node determine the bandwidth. 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 step. Highest slew rates are therefore seen in the lowest 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 a heavy load (capacitive or resistive) is driven, the network is incompletely bootstrapped and adds to the compensation at the high impedance node. The added capacitance moves 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 the total phase lag does not exceed 180 (zero phase margin), and the amplifier remains stable. In this way, the LT1813/ LT1814 are stable with up to 1000pF capacitive loads in unity gain, and even higher capacitive loads in higher closed-loop gain configurations. W UU 11 LT1813/LT1814 SI PLIFIED SCHE ATIC V+ -IN C V- 1814 SS TYPICAL APPLICATIO 232 4MHz, 4th Order Butterworth Filter 274 232 VIN 220pF 665 47pF VOLTAGE GAIN (dB) 1/2 LT1813 470pF Gain of 20 Composite Amplifier Drives Differential Load with Low Distortion 10k 9k 68pF 1/4 LT1814 VIN 1k GAIN = 20 -3dB BANDWIDTH = 10MHz DISTORTION = -77dB AT 2MHz, RL = 1k 499 12 + + 800 1/4 LT1814 1/4 LT1814 - - + + - 1k 68pF 1/4 LT1814 + - U - W + - W (one amplifier) R1 +IN RC CC OUT Filter Frequency Response 10 0 -10 -20 -30 -40 -50 -60 -70 -80 1813/14 TA01 274 562 22pF 1/2 LT1813 VOUT VS = 5V VIN = 600mVP-P PEAKING < 0.12dB 1 10 FREQUENCY (MHz) 100 1813/14 TA02 -90 0.1 499 LOAD 499 499 1814 TA03 LT1813/LT1814 PACKAGE DESCRIPTIO 0.007 (0.18) 0.021 0.006 (0.53 0.015) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP 0.014 - 0.019 (0.355 - 0.483) TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 0.016 - 0.050 (0.406 - 1.270) U MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.118 0.004* (3.00 0.102) 8 76 5 0.193 0.006 (4.90 0.15) 0.118 0.004** (3.00 0.102) 1 0.043 (1.10) MAX 0 - 6 TYP SEATING PLANE 23 4 0.034 (0.86) REF 0.009 - 0.015 (0.22 - 0.38) 0.0256 (0.65) BSC 0.005 0.002 (0.13 0.05) MSOP (MS8) 1100 S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 0.189 - 0.197* (4.801 - 5.004) 8 7 6 5 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157** (3.810 - 3.988) SO8 1298 1 2 3 4 0.053 - 0.069 (1.346 - 1.752) 0.004 - 0.010 (0.101 - 0.254) 0.050 (1.270) BSC 13 LT1813/LT1814 PACKAGE DESCRIPTIO S Package 14-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 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 **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 14 U 0.337 - 0.344* (8.560 - 8.738) 14 13 12 11 10 9 8 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157** (3.810 - 3.988) 1 2 3 4 5 6 7 0.053 - 0.069 (1.346 - 1.752) 0.004 - 0.010 (0.101 - 0.254) 0.014 - 0.019 (0.355 - 0.483) TYP 0.050 (1.270) BSC S14 1298 LT1813/LT1814 PACKAGE DESCRIPTIO 0.007 - 0.0098 (0.178 - 0.249) 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 ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U GN Package 16-Lead Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641) 0.189 - 0.196* (4.801 - 4.978) 16 15 14 13 12 11 10 9 0.009 (0.229) REF 0.229 - 0.244 (5.817 - 6.198) 0.150 - 0.157** (3.810 - 3.988) 1 0.015 0.004 x 45 (0.38 0.10) 0 - 8 TYP 0.053 - 0.068 (1.351 - 1.727) 23 4 56 7 8 0.004 - 0.0098 (0.102 - 0.249) 0.008 - 0.012 (0.203 - 0.305) 0.0250 (0.635) BSC GN16 (SSOP) 1098 15 LT1813/LT1814 TYPICAL APPLICATIO U Two Op Amp Instrumentation Amplifier R5 220 R1 10k R2 1k R4 10k - 1/2 LT1813 R3 1k - 1/2 LT1813 VOUT - VIN + + + R4 1 R2 R3 R2 + R3 GAIN = 1 + + + R5 R3 2 R1 R4 TRIM R5 FOR GAIN TRIM R1 FOR COMMON MODE REJECTION BW = 1MHz ( ) = 102 1813/14 TA03 RELATED PARTS PART NUMBER LT1363/LT1364/LT1365 LT1395/LT1396/LT1397 LT1806/LT1807 LT1809/LT1810 LT1812 LT1815/LT1816 DESCRIPTION Single/Dual/Quad 70MHz, 1000V/s, C-LoadTM Op Amps Single/Dual/Quad 400MHz Current Feedback Amplifiers Single/Dual 325MHz, 140V/s Rail-to-Rail I/O Op Amps Single/Dual 180MHz, 350V/s Rail-to-Rail I/O Op Amps Single 3mA, 100MHz, 750V/s Op Amp Single/Dual 220MHz, 1500V/s Op Amps COMMENTS 2.5V to 15V Operation 4.6mA Supply Current, 800V/s, 80mA Output Current Low Noise 3.5nV/Hz Low Distortion -90dBc at 5MHz Single Version of LT1813/LT1814; 50A Shutdown Option 6.5mA Supply Current, 6nV/Hz Input Noise C-Load is a trademark of Linear Technology Corporation. 16 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com 18134f LT/TP 0601 2K * PRINTED IN THE USA (c) LINEAR TECHNOLOGY CORPORATION 2001 |
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