LT1225CS8

LT1225 Very High Speed Operational Amplifier FEATURES s s s s s s s s s s DESCRIPTIO Gain of 5 Stable 150MHz Gain Bandwidth 400V/µs Slew Rate 20V/mV DC Gain, RL = 500Ω 1mV Maximum Input Offset Voltage ±12V Minimum Output Swing into 500Ω Wide Supply Range: ± 2.5V to ± 15V 7mA Supply Current 90ns Settling Time to 0.1%, 10V Step Drives All Capacitive Loads The LT1225 is a very high speed operational amplifier with excellent DC performance. The LT1225 features reduced input offset voltage and higher DC gain than devices with comparable bandwidth and slew rate. The circuit is a single gain stage with outstanding settling characteristics. The fast settling time makes the circuit an ideal choice for data acquisition systems. The output is capable of driving a 500Ω load to ± 12V with ± 15V supplies and a 150Ω load to ± 3V on ± 5V supplies. The circuit is also capable of driving large capacitive loads which makes it useful in buffer or cable driver applications. The LT1225 is a member of a family of fast, high performance amplifiers that employ Linear Technology Corporation’s advanced bipolar complementary processing. APPLICATI s s s s s s S Wideband Amplifiers Buffers Active Filters Video and RF Amplification Cable Drivers Data Acquisition Systems TYPICAL APPLICATI 20MHz,AV = 50 Instrumentation Amplifier + LT1225 Gain of 5 Pulse Response – 1k 10k 1k + VIN 250Ω 200pF + LT1225 VOUT 1k 250Ω 1k – – 10k – LT1225 + LT1225 TA01 U LT1225 TA02 UO UO 1 LT1225 ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW NULL –IN +IN V– 1 2 3 4 8 7 6 5 NULL V+ OUT NC Total Supply Voltage (V + to V –) .............................. 36V Differential Input Voltage ......................................... ± 6V Input Voltage ............................................................ ±VS Output Short Circuit Duration (Note 1) ............ Indefinite Operating Temperature Range LT1225C ................................................ 0°C to 70°C Maximum Junction Temperature Plastic Package .............................................. 150°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec.)................. 300°C ORDER PART NUMBER LT1225CN8 LT1225CS8 S8 PART MARKING 1225 N8 PACKAGE S8 PACKAGE 8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC LT1225 PO01 TJ MAX = 15O°C, θJA = 130°C/ W (N8) TJ MAX = 15O°C, θJA = 220°C/ W (S8) ELECTRICAL CHARACTERISTICS SYMBOL VOS IOS IB en in RIN CIN PARAMETER Input Offset Voltage Input Offset Current Input Bias Current Input Noise Voltage Input Noise Current Input Resistance Input Capacitance Input Voltage Range + Input Voltage Range – CMRR PSRR AVOL VOUT IOUT SR GBW tr, tf Common-Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain Output Swing Output Current Slew Rate Full Power Bandwidth Gain Bandwidth Rise Time, Fall Time Overshoot Propagation Delay ts Settling Time Differential Gain Differential Phase RO IS Output Resistance Supply Current VS = ±15V, TA = 25°C, VCM = 0V unless otherwise noted. MIN TYP 0.5 100 4 MAX 1.0 400 8 UNITS mV nA µA nV/√Hz pA/√Hz MΩ kΩ pF V –12 V dB dB V/mV V mA V/µs MHz MHz ns % ns ns % Deg Ω 9 mA CONDITIONS (Note 2) f = 10kHz f = 10kHz VCM = ±12V Differential 24 7.5 1.5 40 70 2 12 14 –13 115 95 20 ± 13.3 40 400 6.4 150 7 20 7 90 1.0 1.7 4.5 7 VCM = ±12V VS = ± 5V to ±15V VOUT = ±10V, RL = 500Ω RL = 500Ω VOUT = ±12V (Note 3) 10V Peak, (Note 4) f = 1MHz AVCL = 5, 10% to 90%, 0.1V AVCL = 5, 0.1V 50% VIN to 50% VOUT 10V Step, 0.1%, AV = – 5 f = 3.58MHz, AV = 5, RL = 150Ω f = 3.58MHz, AV = 5, RL = 150Ω AVCL = 5, f = 1MHz 94 86 12.5 ± 12.0 24 250 2 U W U U WW W LT1225 ELECTRICAL CHARACTERISTICS VS = ± 5V, TA = 25°C, VCM = 0V unless otherwise noted. SYMBOL VOS IOS IB PARAMETER Input Offset Voltage Input Offset Current Input Bias Current Input Voltage Range + Input Voltage Range – CMRR AVOL VOUT IOUT SR GBW tr, tf Common-Mode Rejection Ratio Large-Signal Voltage Gain Output Voltage Output Current Slew Rate Full Power Bandwidth Gain Bandwidth Rise Time, Fall Time Overshoot Propagation Delay ts IS Settling Time Supply Current VCM = ± 2.5V VOUT = ± 2.5V, RL = 500Ω VOUT = ± 2.5V, RL = 150Ω RL = 500Ω RL = 150Ω VOUT = ± 3V (Note 3) 3V Peak, (Note 4) f = 1MHz AVCL = 5, 10% to 90%, 0.1V AVCL = 5, 0.1V 50% VIN to 50% VOUT – 2.5V to 2.5V, 0.1%, AV = – 4 94 10 ± 3.0 ± 3.0 20 2.5 CONDITIONS (Note 2) MIN TYP 1.0 100 4 4 –3 115 15 13 ± 3.7 ± 3.3 40 250 13.3 100 9 10 9 70 7 9 – 2.5 MAX 2.0 400 8 UNITS mV nA µA V V dB V/mV V/mV V V mA V/µs MHz MHz ns % ns ns mA ELECTRICAL CHARACTERISTICS SYMBOL VOS PARAMETER Input Offset Voltage Input VOS Drift IOS IB CMRR PSRR AVOL VOUT IOUT SR IS Input Offset Current Input Bias Current Common-Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain Output Swing Output Current Slew Rate Supply Current CONDITIONS 0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted. MIN TYP 0.5 1.0 10 100 4 93 85 10 8 ± 12.0 ± 3.0 24 20 250 115 95 12.5 10 ± 13.3 ± 3.3 40 40 400 7 10.5 MAX 1.5 2.5 600 9 UNITS mV mV µV/°C nA µA dB dB V/mV V/mV V V mA mA V/µs mA VS = ±15V, (Note 2) VS = ±5V, (Note 2) VS = ±15V and VS = ± 5V VS = ±15V and VS = ± 5V VS = ±15V, VCM = ±12V and VS = ± 5V, VCM = ± 2.5V VS = ± 5V to ± 15V VS = ±15V, VOUT = ± 10V, RL = 500Ω VS = ± 5V, VOUT = ± 2.5V, RL = 500Ω VS = ±15V, RL = 500Ω VS = ± 5V, RL = 500Ω or 150Ω VS = ±15V, VOUT = ± 12V VS = ± 5V, VOUT = ± 3V VS = ±15V, (Note 3) VS = ±15V and VS = ± 5V Note 1: A heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely. Note 2: Input offset voltage is tested with automated test equipment in 10VP-P 1MHz 100pF LT1225 TA05 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 circuits as described herein will not infringe on existing patent rights. U Compensation The LT1225 has a typical gain-bandwidth product of 150MHz which allows it to have wide bandwidth in high gain configurations (i.e., in a gain of 10 it will have a bandwidth of about 15MHz). The amplifier is stable in a noise gain of 5 so the ratio of the output signal to the inverting input must be 1/5 or less. Straightforward gain configurations of 5 or –4 are stable, but there are a few configurations that allow the amplifier to be stable for lower signal gains (the noise gain, however, remains 5 or more). One example is the summing amplifier shown in the typical applications section below. Each input signal has a gain of –RF/RIN to the output, but it is easily seen that this configuration is equivalent to a gain of –4 as far as the amplifier is concerned. Lag compensation can also be used to give a low frequency gain less than 5 with a high frequency gain of 5 or greater. The example below has a DC gain of one, but an AC gain of 5. The break frequency of the RC combination across the amplifier inputs should be approximately a factor of 10 less than the gain bandwidth of the amplifier divided by the high frequency gain (in this case 1/10 of 150MHz/5 or 3MHz). Cable Driving R3 75 Ω 75Ω CABLE VOUT R4 75Ω LT1225 AI04 W UO U UO – R1 1k R2 250Ω LT1225 TA04 Summing Amplifier RF RIN VIN1 RIN VIN2 RIN VINn RIN = nRF 4 LT1225 TA06 – LT1225 VOUT + 7 LT1225 SI PLIFIED SCHE ATIC V+ 7 NULL 1 8 +IN 3 V– 4 LT1224 • TA10 PACKAGE DESCRIPTIO 0.300 – 0.320 (7.620 – 8.128) 0.009 – 0.015 (0.229 – 0.381) 0.065 (1.651) TYP 0.125 (3.175) MIN 0.020 (0.508) MIN ( +0.025 0.325 –0.015 +0.635 8.255 –0.381 ) 0.045 ± 0.015 (1.143 ± 0.381) 0.100 ± 0.010 (2.540 ± 0.254) 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.016 – 0.050 0.406 – 1.270 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0.228 – 0.244 (5.791 – 6.197) 0°– 8° TYP 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977 U W W BIAS 1 2 –IN BIAS 2 6 OUT Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead Plastic DIP 0.045 – 0.065 (1.143 – 1.651) 0.130 ± 0.005 (3.302 ± 0.127) 0.400 (10.160) MAX 8 7 6 5 0.250 ± 0.010 (6.350 ± 0.254) 1 2 3 4 N8 0392 0.018 ± 0.003 (0.457 ± 0.076) S8 Package 8-Lead Plastic SOIC 8 0.189 – 0.197 (4.801 – 5.004) 7 6 5 0.014 – 0.019 (0.355 – 0.483) 0.050 (1.270) BSC 0.150 – 0.157 (3.810 – 3.988) 1 2 3 4 SO8 0392 LT/GP 1092 5K REV A © LINEAR TECHNOLOGY CORPORATION 1992