LT1813/LT1814 Dual/Quad 3mA, 100MHz, 750V/µs Operational Amplifiers U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ The LT®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. 100MHz Gain Bandwidth Product 750V/µs Slew Rate 3.6mA Maximum Supply Current per Amplifier 8nV/√Hz Input Noise Voltage Unity-Gain Stable 1.5mV Maximum Input Offset Voltage 4µA 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: –40°C to 85°C The output drives a 100Ω load to ±3.5V with ±5V supplies. On a single 5V supply, the output swings from 1.1V to 3.9V with a 100Ω load connected to 2.5V. The amplifiers are stable with a 1000pF capacitive load making them useful in buffer and cable driver applications. U APPLICATIO S ■ ■ ■ ■ ■ ■ ■ 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). Active Filters Wideband Amplifiers Buffers Video Amplification Communication Receivers Cable Drivers Data Acquisition Systems , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATIO Bandpass Filter with Independently Settable Gain, Q and fC R1 RQ C – 1/4 LT1814 + 1/4 LT1814 + GAIN = R1 RG fC = 1 2πRFC C R RF 1/4 LT1814 BANDPASS OUT OUTPUT MAGNITUDE (6dB/DIV) RF + Q = R1 RQ 0 – R 1/4 LT1814 R = 499Ω R1 = 499Ω RF = 475Ω RQ = 49.9Ω RG = 499Ω C = 3.3nF fC = 100kHz Q = 10 GAIN = 1 1k + – – RG VIN Filter Frequency Response R 1814 TA01 10k VS = ±5V VIN = 5VP-P DISTORTION: 2nd < –76dB 3rd < –90dB ACROSS FREQ RANGE 100k 1M FREQUENCY (Hz) 10M 1814 TA02 1 LT1813/LT1814 W W W AXI U U ABSOLUTE RATI GS (Note 1) 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 Operating Temperature Range ................ – 40°C to 85°C Specified Temperature Range (Note 8) .. – 40°C to 85°C Maximum Junction Temperature ......................... 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 8 7 6 5 V+ OUT B –IN B +IN B OUT A 1 8 V+ –IN A 2 7 OUT B +IN A 3 V– 4 MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 250°C/W B 6 –IN B +IN B 5 5 +IN B –IN B 6 –IN A 2 13 –IN D +IN A 3 12 +IN D + –B +IN B 5 + 10 +IN C – 9 –IN C C 8 –IN B 6 MS8 PART MARKING LTGZ S8 PART MARKING 1813D 1813 1813I 813HVD 1813HV 813HVI 15 –IN D 14 +IN D + 12 +IN C C– 11 –IN C 10 OUT C NC 8 9 NC GN PACKAGE 16-LEAD PLASTIC SSOP TJMAX = 150°C, θJA = 110°C/W ORDER PART NUMBER LT1813DS8* LT1813CS8 LT1813IS8 LT1813HVDS8* LT1813HVCS8 LT1813HVIS8 D 13 V – + –B OUT B 7 OUT C S PACKAGE 14-LEAD PLASTIC SO TJMAX = 150°C, θJA = 150°C/W ORDER PART NUMBER LT1813DMS8* 16 OUT D – A + V+ 4 11 V – OUT B 7 S8 PACKAGE 8-LEAD PLASTIC SO D V+ 4 A +IN A 3 + – 1 2 3 4 – A + + – OUTA –IN A +IN A V– –IN A 2 OUT A 1 14 OUT D OUT A 1 TOP VIEW TOP VIEW TJMAX = 150°C, θJA = 135°C/W ORDER PART NUMBER LT1814CGN LT1814IGN GN PART MARKING 1814 1814I ORDER PART NUMBER LT1814CS LT1814IS Consult LTC marketing for parts specified with wider operating temperature ranges. *See Note 9. ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, VCM = 0V, unless otherwise noted. (Note 8) SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage (Note 4) TA = 0°C to 70°C TA = – 40°C to 85°C ∆VOS ∆T Input Offset Voltage Drift IOS Input Offset Current IB MIN TYP MAX UNITS 0.5 1.5 2 3 mV mV mV 10 10 15 30 µV/°C µV/°C 50 400 500 600 nA nA nA – 0.9 ±4 ±5 ±6 µA µA µA ● ● TA = 0°C to 70°C (Note 7) TA = – 40°C to 85°C (Note 7) ● ● TA = 0°C to 70°C TA = – 40°C to 85°C ● ● TA = 0°C to 70°C TA = – 40°C to 85°C ● ● Input Bias Current en Input Noise Voltage Density f = 10kHz 8 nV/√Hz in Input Noise Current Density f = 10kHz 1 pA/√Hz 2 LT1813/LT1814 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, VCM = 0V, unless otherwise noted. (Note 8) SYMBOL PARAMETER CONDITIONS RIN Input Resistance VCM = 3.5V Differential CIN Input Capacitance VCM Input Voltage Range CMRR Common Mode Rejection Ratio Minimum Supply Voltage PSRR AVOL VOUT IOUT ISC SR Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Swing (Positive/Negative) Maximum Output Current Output Short-Circuit Current Slew Rate MIN TYP 3 10 1.5 MAX UNITS MΩ MΩ 2 pF Guaranteed by CMRR TA = –40°C to 85°C ±3.5 ±3.5 ±4.2 ● V V VCM = ±3.5V TA = 0°C to 70°C TA = – 40°C to 85°C 75 73 72 85 ● ● dB dB dB Guaranteed by PSRR TA = –40°C to 85°C ● VS = ±2V to ±5.5V TA = 0°C to 70°C TA = – 40°C to 85°C 78 76 75 97 ● ● dB dB dB VS = ±2V to ±6.5V (LT1813HV) TA = 0°C to 70°C TA = – 40°C to 85°C 75 73 72 97 ● ● dB dB dB VOUT = ±3V, RL = 500Ω TA = 0°C to 70°C TA = – 40°C to 85°C 1.5 1.0 0.8 3 ● ● V/mV V/mV V/mV VOUT = ±3V, RL = 100Ω TA = 0°C to 70°C TA = – 40°C to 85°C 1.0 0.7 0.6 2.5 ● ● V/mV V/mV V/mV RL = 500Ω, 30mV Overdrive TA = 0°C to 70°C TA = – 40°C to 85°C ±3.8 ±3.7 ±3.6 ±4 ● ● V V V RL = 100Ω, 30mV Overdrive TA = 0°C to 70°C TA = – 40°C to 85°C ● ±3.25 ● ±3.15 ±3.35 ±3.5 V V V VOUT = ±3V, 30mV Overdrive TA = 0°C to 70°C TA = – 40°C to 85°C ±40 ±35 ±30 ±60 ● ● mA mA mA VOUT = 0V, 1V Overdrive (Note 3) TA = 0°C to 70°C TA = – 40°C to 85°C ±75 ±60 ±55 ±100 ● ● mA mA mA AV = –1 (Note 5) TA = 0°C to 70°C TA = – 40°C to 85°C 500 400 350 750 ● ● V/µs V/µs V/µs 40 MHz 100 MHz MHz MHz 200 MHz FPBW Full Power Bandwidth 6VP-P (Note 6) GBW Gain Bandwidth Product f = 200kHz, RL = 500Ω TA = 0°C to 70°C TA = – 40°C to 85°C ±1.25 ● ● 75 65 60 ±2 ±2 V V –3dB BW –3dB Bandwidth AV = 1, RL = 500Ω tr, tf Rise Time, Fall Time AV = 1, 10% to 90%, 0.1V, RL = 100Ω 2 ns tPD Propagation Delay (Note 10) AV = 1, 50% to 50%, 0.1V, RL = 100Ω 2.8 ns OS Overshoot AV = 1, 0.1V, RL = 100Ω 25 % tS Settling Time AV = –1, 0.1%, 5V 30 ns THD Total Harmonic Distortion AV = 2, f = 1MHz, VOUT = 2VP-P, RL = 500Ω –76 dB dG Differential Gain AV = 2, VOUT = 2VP-P, RL = 150Ω 0.12 % 3 LT1813/LT1814 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, VCM = 0V, unless otherwise noted. (Note 8) SYMBOL PARAMETER dP Differential Phase AV = 2, VOUT = 2VP-P, RL = 150Ω 0.07 DEG ROUT Output Resistance AV = 1, f = 1MHz 0.4 Ω Channel Separation VOUT = ±3V, RL = 100Ω TA = 0°C to 70°C TA = – 40°C to 85°C 100 ● ● dB dB dB Per Amplifier TA = 0°C to 70°C TA = – 40°C to 85°C ● ● 3.6 4.5 5.0 mA mA mA Per Amplifier,VS = ±6.5V, (LT1813HV only) TA = 0°C to 70°C TA = – 40°C to 85°C ● ● 4.0 5.0 5.5 mA mA mA IS Supply Current CONDITIONS MIN 82 81 80 TYP 3 MAX UNITS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 5V, VCM = 2.5V, RL to 2.5V, unless otherwise noted. (Note 8) VOS Input Offset Voltage ∆VOS ∆T Input Offset Voltage Drift IOS Input Offset Current IB (Note 4) TA = 0°C to 70°C TA = – 40°C to 85°C 0.7 2.0 2.5 3.5 mV mV mV 10 10 15 30 µV/°C µV/°C 50 400 500 600 nA nA nA –1 ±4 ±5 ±6 µA µA µA ● ● TA = 0°C to 70°C (Note 7) TA = – 40°C to 85°C (Note 7) ● ● TA = 0°C to 70°C TA = – 40°C to 85°C ● ● TA = 0°C to 70°C TA = – 40°C to 85°C ● ● Input Bias Current en Input Noise Voltage Density f = 10kHz 8 nV/√Hz in Input Noise Current Density f = 10kHz 1 pA/√Hz RIN Input Resistance VCM = 3.5V Differential CIN Input Capacitance VCM Input Voltage Range (Positive) Guaranteed by CMRR TA = –40°C to 85°C ● Input Voltage Range (Negative) Guaranteed by CMRR TA = –40°C to 85°C ● Common Mode Rejection Ratio VCM = 1.5V to 3.5V TA = 0°C to 70°C TA = – 40°C to 85°C ● ● Guaranteed by PSRR TA = –40°C to 85°C ● VOUT = 1.5V to 3.5V, RL = 500Ω TA = 0°C to 70°C TA = – 40°C to 85°C 1.0 0.7 0.6 2 ● ● V/mV V/mV V/mV VOUT = 1.5V to 3.5V, RL = 100Ω TA = 0°C to 70°C TA = – 40°C to 85°C 0.7 0.5 0.4 1.5 ● ● V/mV V/mV V/mV CMRR Minimum Supply Voltage AVOL 4 Large-Signal Voltage Gain 3 3.5 3.5 10 1.5 MΩ MΩ 2 pF 4.2 V V 0.8 73 71 70 1.5 1.5 82 2.5 V V dB dB dB 4 4 V V LT1813/LT1814 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 5V, VCM = 2.5V, RL to 2.5V, unless otherwise noted. (Note 8) SYMBOL PARAMETER CONDITIONS MIN TYP VOUT Maximum Output Swing (Positive) RL = 500Ω, 30mV Overdrive TA = 0°C to 70°C TA = – 40°C to 85°C 4.1 ● ● 3.9 3.8 3.7 V V V RL = 100Ω, 30mV Overdrive TA = 0°C to 70°C TA = – 40°C to 85°C 3.7 3.6 3.5 3.9 ● ● V V V RL = 500Ω, 30mV Overdrive TA = 0°C to 70°C TA = – 40°C to 85°C ● ● RL = 100Ω, 30mV Overdrive TA = 0°C to 70°C TA = – 40°C to 85°C ● ● VOUT = 1.5V or 3.5V, 30mV Overdrive TA = 0°C to 70°C TA = – 40°C to 85°C ±25 ±20 ±17 ±35 ● ● mA mA mA VOUT = 2.5V, 1V Overdrive (Note 3) TA = 0°C to 70°C TA = – 40°C to 85°C ±55 ±45 ±40 ±75 ● ● mA mA mA AV = –1 (Note 5) TA = 0°C to 70°C TA = – 40°C to 85°C 200 150 125 350 ● ● V/µs V/µs V/µs 55 MHz 94 MHz MHz MHz Maximum Output Swing (Negative) IOUT ISC SR Maximum Output Current Output Short-Circuit Current Slew Rate FPBW Full Power Bandwidth 2VP-P (Note 6) GBW Gain Bandwidth Product f = 200kHz, RL = 500Ω TA = 0°C to 70°C TA = – 40°C to 85°C ● ● 65 55 50 MAX UNITS 0.9 1.1 1.2 1.3 V V V 1.1 1.3 1.4 1.5 V V V –3dB BW –3dB Bandwidth AV = 1, RL = 500Ω 180 MHz tr, tf Rise Time, Fall Time AV = 1, 10% to 90%, 0.1V, RL = 100Ω 2.1 ns tPD Propagation Delay (Note 10) AV = 1, 50% to 50%, 0.1V, RL = 100Ω 3 ns OS Overshoot AV = 1, 0.1V, RL = 100Ω 25 % tS Settling Time AV = –1, 0.1%, 2V 30 ns THD Total Harmonic Distortion AV = 2, f = 1MHz, VOUT = 2VP-P, RL = 500Ω –75 dB dG Differential Gain AV = 2, VOUT = 2VP-P, RL = 150Ω 0.22 % dP Differential Phase AV = 2, VOUT = 2VP-P, RL = 150Ω 0.21 DEG ROUT Output Resistance AV = 1, f = 1MHz Channel Separation VOUT = 1.5V to 3.5V, RL = 100Ω TA = 0°C to 70°C TA = – 40°C to 85°C ● ● Per Amplifier TA = 0°C to 70°C TA = – 40°C to 85°C ● ● IS Supply Current 81 80 79 0.45 Ω 100 dB dB dB 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/2πVP Note 7: This parameter is not 100% tested Note 8: The LT1813C/LT1814C are guaranteed to meet specified performance from 0°C to 70°C and is designed, characterized and expected to meet the extended temperature limits, but is not tested at –40°C and 85°C. The LT1813I/LT1814I are guaranteed to meet the extended temperature limits. Note 9: The LT1813D is 100% production tested at 25°C. It is designed, characterized and expected to meet the 0°C to 70°C specifications although it is not tested or QA sampled at these temperatures. The LT1813D is guaranteed functional from –40°C to 85°C 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. U W TYPICAL PERFOR A CE CHARACTERISTICS Input Common Mode Range vs Supply Voltage Supply Current vs Temperature V+ 5 PER AMPLIFIER VS = ± 2.5V 2 1 –1.0 INPUT BIAS CURRENT (µA) INPUT COMMON MODE RANGE (V) VS = ± 5V 3 0 – 0.5 4 SUPPLY CURRENT (mA) Input Bias Current vs Common Mode Voltage –1.5 – 2.0 TA = 25°C ∆VOS < 1mV 2.0 1.5 1.0 TA = 25°C VS = ± 5V – 0.5 –1.0 –1.5 0.5 V– 50 25 0 75 TEMPERATURE (°C) 100 125 0 1 4 3 2 5 SUPPLY VOLTAGE (± V) Input Bias Current vs Temperature INPUT VOLTAGE NOISE (nV/√Hz) INPUT BIAS CURRENT (µA) –1.0 –1.1 50 25 75 0 TEMPERATURE (°C) 100 125 1813/14 G04 6 75.0 10 TA = 25°C VS = ± 5V AV = 101 RS = 10k in 10 1 en 1 10 100 1k 10k FREQUENCY (Hz) 0.1 100k 1813/14 G05 INPUT CURRENT NOISE (pA/√Hz) – 0.9 –1.2 – 50 – 25 Open-Loop Gain vs Resistive Load 100 – 0.8 5.0 1813/14 G03 Input Noise Spectral Density VS = ± 5V – 0.7 0 2.5 – 2.5 INPUT COMMON MODE VOLTAGE (V) 1813/14 G02 1813/14 G01 – 0.6 – 2.0 – 5.0 7 6 TA = 25°C 72.5 OPEN-LOOP GAIN (dB) 0 –50 –25 70.0 VS = ± 5V 67.5 VS = ± 2.5V 65.0 62.5 60 100 1k LOAD RESISTANCE (Ω) 10k 1813/14 G06 LT1813/LT1814 U W TYPICAL PERFOR A CE CHARACTERISTICS V+ VS = ± 5V VO = ± 3V – 0.5 OUTPUT VOLTAGE SWING (V) OPEN-LOOP GAIN (dB) 72.5 RL = 500Ω 70.0 67.5 RL = 100Ω 65.0 62.5 V+ TA = 25°C VIN = 30mV –1.0 –1.5 RL = 100Ω – 2.0 2.0 RL = 100Ω 1.5 1.0 RL = 500Ω 0.5 60.0 –50 –25 50 25 75 0 TEMPERATURE (°C) 100 – 0.5 RL = 500Ω OUTPUT VOLTAGE SWING (V) 75.0 Output Voltage Swing vs Load Current Output Voltage Swing vs Supply Voltage Open-Loop Gain vs Temperature 0 1 4 3 2 5 SUPPLY VOLTAGE (± V) 0 20 40 –20 OUTPUT CURRENT (mA) 60 Output Impedance vs Frequency 4 3 100 SINK 90 2 1 0 –1 VS = ± 5V AV = –1 RF = 500Ω CF = 3pF 0.1% SETTLING –2 –3 –4 –5 75 0 25 50 TEMPERATURE (°C) 100 0 125 5 20 15 10 25 SETTLING TIME (ns) 100 –10 80 –20 ±2.5V ±2.5V ±5V 40 ±5V 20 20 10 0 0 PHASE (DEG) 60 30 –20 1M 10M FREQUENCY (Hz) 100M 30 –40 1000M 1813/14 G13 TA = 25°C VS = ± 5V 0.001 10k 35 100k 1M 10M FREQUENCY (Hz) Gain Bandwidth and Phase Margin vs Temperature 115 TA = 25°C AV = 10 VIN = 0dBm RL = 100Ω RL = 500Ω GBW VS = ± 5V 105 –30 –40 –50 –60 –70 GBW VS = ±2.5V 95 85 40 PHASE MARGIN VS = ±5V 38 PHASE MARGIN VS = ±2.5V –80 –90 100k 100M 1813/14 G12 GAIN BANDWIDTH (MHz) 0 PHASE GAIN 40 0.1 1M 10M 100M FREQUENCY (Hz) 1000M 1813/14 G14 –50 –25 50 25 0 75 TEMPERATURE (°C) PHASE MARGIN (DEG) 50 120 CROSSTALK (dB) 60 AV = 1 0.01 Crosstalk vs Frequency TA = 25°C AV = –1 RF = RG = 500Ω AV = 10 1 1813/14 G11 Gain and Phase vs Frequency 70 AV = 100 10 OUTPUT IMPEDANCE (Ω) 110 OUTPUT STEP (V) OUTPUT SHORT-CIRCUIT CURRENT (mA) –40 100 1813/14 G10 GAIN (dB) 1.0 Settling Time vs Output Step VS = ± 5V 100k 1.5 1813/14 G09 5 SOURCE –10 10k 2.0 1813/14 G02 Output Short-Circuit Current vs Temperature 80 –50 –25 – 2.0 V– –60 7 6 1813/14 G07 120 –1.5 0.5 V– 125 –1.0 VS = ± 5V VIN = 30mV 85°C 25°C – 40°C 100 36 125 1813/14 G15 7 LT1813/LT1814 U W TYPICAL PERFOR A CE CHARACTERISTICS Frequency Response vs Supply Voltage, AV = 2 Frequency Response vs Supply Voltage, AV = 1 VS = ±2.5V 0 VS = ±5V –2 TA = 25°C AV = 2 RL = 100Ω 6 VOLTAGE MAGNITUDE (dB) –4 –6 –8 –10 4 2 VS = ±2.5V VS = ±5V 0 –2 –14 1M 10M 100M FREQUENCY (Hz) 10M 100M FREQUENCY (Hz) CL= 500pF CL= 200pF CL= 100pF 4 CL= 50pF CL= 0 0 –4 TA = 25°C GBW RL = 100Ω 45 PHASE MARGIN RL = 100Ω 40 PHASE MARGIN RL = 500Ω 0 1 5 4 3 SUPPLY VOLTAGE (±V) 6 2 PHASE MARGIN (DEG) 90 POWER SUPPLY REJECTION RATIO (dB) GBW RL = 500Ω 70 Common Mode Rejection Ratio vs Frequency TA = 25°C AV = 1 VS = ±5V 80 –PSRR +PSRR 60 40 20 1k 10k 1M 100k FREQUENCY (Hz) 10M 80 60 40 20 0 100M 1k 1000 TA =25°C AV = –1 V = ±5V 1000 RS = R = R = 500Ω F G L 200 SLEW RATE (V/µs) SLEW RATE (V/µs) SR – 300 10M 100M Slew Rate vs Input Level TA =25°C AV = –1 V = ±1V 400 RIN= R = R = 500Ω F G L + 400 100k 1M FREQUENCY (Hz) 1200 450 500 10k 1813/14 G21 Slew Rate vs Supply Voltage 600 TA = 25°C VS = ±5V 1813/14 G20 Slew Rate vs Supply Voltage SR 100 0 35 7 1813/14 G19 TA =25°C 900 AV = –1 /2 V =V 800 RIN= R S(TOTAL) F G = RL = 500Ω 700 100M 200M 1813/14 G18 Power Supply Rejection Ratio vs Frequency 100 110 10M FREQUENCY (Hz) 1 500M 1813/14 G17 Gain Bandwidth and Phase Margin vs Supply Voltage GAIN BANDWIDTH (MHz) CL= 1000pF –8 –6 1M 500M 1813/14 G16 SLEW RATE (V/µs) TA = 25°C AV = –1 V = ±5V 8 S RF = RG = 500Ω NO RL –4 –12 COMMON MODE REJECTION RATIO (dB) VOLTAGE MAGNITUDE (dB) 2 12 8 TA = 25°C AV = 1 NO RL VOLTAGE MAGNITUDE (dB) 6 4 Frequency Response vs Capacitive Load, AV = –1 350 SR + SR – 300 SR + 800 SR – 600 400 250 100 0 0 1 4 3 2 5 SUPPLY VOLTAGE (±V) 6 7 1813/14 G22 8 200 200 0 1 4 3 2 5 SUPPLY VOLTAGE (±V) 6 7 1813/14 G23 0 1 2 4 3 5 6 INPUT LEVEL (VP-P) 7 8 1813/14 G24 LT1813/LT1814 U W TYPICAL PERFOR A CE CHARACTERISTICS 800 SR – VS = ± 5V 700 600 500 400 SR – VS = ±2.5V 300 SR + VS = ±2.5V 200 –50 –25 0 75 25 50 TEMPERATURE (°C) 100 AV = –1 0.005 AV = 1 0.002 TA = 25°C VS = ± 5V VO = 2VP-P RL = 500Ω 0.001 10 125 100 1k 10k FREQUENCY (Hz) 3RD HARMONIC RL = 100Ω –70 –80 3RD HARMONIC RL = 500Ω –90 –100 100k 2ND HARMONIC RL = 500Ω DIFFERENTIAL PHASE (DEG) –60 3 2 1813/14 G28 Small-Signal Transient (AV = 1) 1813/14 G31 1M 10M FREQUENCY (Hz) DIFFERENTIAL GAIN RL = 150Ω 0.4 90 0.3 80 DIFFERENTIAL GAIN RL = 1k 0.2 0.1 0 DIFFERENTIAL PHASE RL = 150Ω 0.4 0.3 0.2 100M Capacitive Load Handling 100 TA = 25°C VS = ±5V AV = 1 70 60 50 AV = –1 40 30 20 DIFFERENTIAL PHASE RL = 1k 10 0 0 10M VS = ± 5V RL = 100Ω 2% MAX DISTORTION 1813/14 G27 0.5 0.5 0.1 1M FREQUENCY (Hz) 4 Differential Gain and Phase vs Supply Voltage 2ND HARMONIC RL = 100Ω –50 5 0 100k 100k DIFFERENTIAL GAIN (%) HARMONIC DISTORTION (dB) –40 6 1813/14 G26 2nd and 3rd Harmonic Distortion vs Frequency AV = 2 VS = ±5V VO = 2VP-P AV = 1 7 1 1813/14 G25 –30 AV = – 1 8 OUTPUT VOLTAGE (VP-P) SLEW RATE (V/µs) 900 9 0.01 OVERSHOOT (%) SR + VS = ± 5V TOTAL HARMONIC DISTORTION + NOISE (%) 1100 1000 Undistorted Output Swing vs Frequency Total Harmonic Distortion + Noise vs Frequency Slew Rate vs Temperature 4 10 8 6 TOTAL SUPPLY VOLTAGE (V) 12 10 100 1000 CAPACITIVE LOAD (pF) 1813/14 G30 1813/14 G29 Small-Signal Transient (AV = –1) 1813/14 G32 10000 Small-Signal Transient (AV = 1, CL = 100pF) 1813/14 G33 9 LT1813/LT1814 U W TYPICAL PERFOR A CE CHARACTERISTICS Large-Signal Transient (AV = 1) Large-Signal Transient (AV = –1) 1813/14 G34 1813/14 G35 Large-Signal Transient (AV = –1, CL = 200pF) 1813/14 G36 U W U U 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 (0.01µF ceramics are recommended). For high drive current applications, additional 1µF to 10µF 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 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 100Ω source resistance at each input, the 400nA maximum offset current results in only 40µV of extra offset, while without balance the 4µA 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 U W U U 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., 75Ω) 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 • θJA) 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) Example: LT1814S at 70°C, VS = ±5V, RL=100Ω PDMAX = (10V) • (4.5mA) + (2.5V)2/100Ω = 108mW TJMAX = 70°C + (4 • 108mW) • (100°C/W) = 113°C 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. 11 LT1813/LT1814 W W SI PLIFIED SCHE ATIC (one amplifier) V+ +IN R1 CC RC OUT –IN C V– 1814 SS U TYPICAL APPLICATIO Filter Frequency Response 10 4MHz, 4th Order Butterworth Filter 0 –10 VOLTAGE GAIN (dB) 232Ω 274Ω 232Ω 665Ω VIN – 47pF 274Ω 220pF – 562Ω 1/2 LT1813 + 22pF VOUT 1/2 LT1813 470pF + –20 –30 –40 –50 –60 –70 VS = ±5V VIN = 600mVP-P PEAKING < 0.12dB –80 1813/14 TA01 –90 0.1 1 10 FREQUENCY (MHz) 100 1813/14 TA02 Gain of 20 Composite Amplifier Drives Differential Load with Low Distortion 10k 499Ω 499Ω LOAD 68pF 1/4 LT1814 + – 800Ω + 1/4 LT1814 1/4 LT1814 + – – 1k 9k – 68pF 1/4 LT1814 + VIN 1k 499Ω GAIN = 20 –3dB BANDWIDTH = 10MHz DISTORTION = –77dB AT 2MHz, RL = 1k 499Ω 1814 TA03 12 LT1813/LT1814 U PACKAGE DESCRIPTIO MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.118 ± 0.004* (3.00 ± 0.102) 8 7 6 5 0.118 ± 0.004** (3.00 ± 0.102) 0.193 ± 0.006 (4.90 ± 0.15) 1 2 3 4 0.043 (1.10) MAX 0.007 (0.18) 0.034 (0.86) REF 0° – 6° TYP 0.021 ± 0.006 (0.53 ± 0.015) SEATING PLANE 0.009 – 0.015 (0.22 – 0.38) 0.005 ± 0.002 (0.13 ± 0.05) 0.0256 (0.65) BSC MSOP (MS8) 1100 * 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 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 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) SO8 1298 1 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°– 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 2 3 4 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC 13 LT1813/LT1814 U PACKAGE DESCRIPTIO S Package 14-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 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 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 3 4 5 0.053 – 0.069 (1.346 – 1.752) 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 6 7 0.004 – 0.010 (0.101 – 0.254) 0° – 8° TYP 0.016 – 0.050 (0.406 – 1.270) 14 2 0.050 (1.270) BSC S14 1298 LT1813/LT1814 U PACKAGE DESCRIPTIO 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 0.229 – 0.244 (5.817 – 6.198) 0.150 – 0.157** (3.810 – 3.988) 1 0.015 ± 0.004 × 45° (0.38 ± 0.10) 0.007 – 0.0098 (0.178 – 0.249) 0.009 (0.229) REF 2 3 4 5 6 7 0.053 – 0.068 (1.351 – 1.727) 8 0.004 – 0.0098 (0.102 – 0.249) 0° – 8° TYP 0.016 – 0.050 (0.406 – 1.270) 0.008 – 0.012 (0.203 – 0.305) 0.0250 (0.635) BSC * 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. GN16 (SSOP) 1098 15 LT1813/LT1814 U TYPICAL APPLICATIO Two Op Amp Instrumentation Amplifier R5 220Ω R1 10k R2 1k R3 1k – 1/2 LT1813 – R4 10k – 1/2 LT1813 + VOUT + VIN + ( R4 1 R2 R3 R2 + R3 GAIN = 1 + + + R5 R3 2 R1 R4 ) = 102 TRIM R5 FOR GAIN TRIM R1 FOR COMMON MODE REJECTION BW = 1MHz 1813/14 TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1363/LT1364/LT1365 Single/Dual/Quad 70MHz, 1000V/µs, C-LoadTM Op Amps ±2.5V to ±15V Operation LT1395/LT1396/LT1397 Single/Dual/Quad 400MHz Current Feedback Amplifiers 4.6mA Supply Current, 800V/µs, 80mA Output Current LT1806/LT1807 Single/Dual 325MHz, 140V/µs Rail-to-Rail I/O Op Amps Low Noise 3.5nV/√Hz LT1809/LT1810 Single/Dual 180MHz, 350V/µs Rail-to-Rail I/O Op Amps Low Distortion –90dBc at 5MHz LT1812 Single 3mA, 100MHz, 750V/µs Op Amp Single Version of LT1813/LT1814; 50µA Shutdown Option LT1815/LT1816 Single/Dual 220MHz, 1500V/µs Op Amps 6.5mA Supply Current, 6nV/√Hz Input Noise C-Load is a trademark of Linear Technology Corporation. 16 Linear Technology Corporation 18134f LT/TP 0601 2K • PRINTED IN THE USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com LINEAR TECHNOLOGY CORPORATION 2001