LT1800 80MHz, 25V/µs Low Power Rail-to-Rail Input and Output Precision Op Amp U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Gain Bandwidth Product: 80MHz Input Common Mode Range Includes Both Rails Output Swings Rail-to-Rail Low Quiescent Current: 2mA Max Input Offset Voltage: 350µV Max Input Bias Current: 250nA Max Low Voltage Noise: 8.5nV/√Hz Slew Rate: 25V/µs Common Mode Rejection: 105dB Power Supply Rejection: 97dB Open-Loop Gain: 85V/mV Available in the 8-Pin SO and 5-Pin Low Profile (1mm) ThinSOTTM Packages Operating Temperature Range: – 40°C to 85°C U APPLICATIO S ■ ■ ■ ■ Low Voltage, High Frequency Signal Processing Driving A/D Converters Rail-to-Rail Buffer Amplifiers Active Filters Video Line Driver The LT1800 has an input range that includes both supply rails and an output that swings within 20mV of either supply rail to maximize the signal dynamic range in low supply applications. The LT1800 maintains its performance for supplies from 2.3V to 12.6V and is specified at 3V, 5V and ±5V supplies. The inputs can be driven beyond the supplies without damage or phase reversal of the output. The LT1800 is available in the 8-pin SO package with the standard op amp pinout and in the 5-pin SOT-23 package. For dual and quad versions of the LT1800, see the LT1801/ LT1802 data sheet. The LT1800 can be used as a plug-in replacement for many op amps to improve input/output range and performance. , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. U ■ The LT ®1800 is a low power, high speed rail-to-rail input and output operational amplifier with excellent DC performance. The LT1800 features reduced supply current, lower input offset voltage, lower input bias current and higher DC gain than other devices with comparable bandwidth. TYPICAL APPLICATIO Laser Driver Amplifier 500mA Pulse Response Single Supply 1A Laser Driver Amplifier 5V VIN DO NOT FLOAT + – R3 10Ω LT1800 Q1 ZETEX FMMT619 C1 39pF R2 330Ω 100mA/DIV IR LASER INFINEON SFH495 R1 1Ω 1800 TA01 50ns/DIV 1800 TA02 1800f 1 LT1800 W W W AXI U U ABSOLUTE RATI GS (Note 1) Total Supply Voltage (VS– to VS+) ......................... 12.6V Input Current (Note 2) ........................................ ±10mA Output Short-Circuit Duration (Note 3) ............ Indefinite Operating Temperature Range (Note 4) .. – 40°C to 85°C Specified Temperature Range (Note 5) ... – 40°C to 85°C 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 ORDER PART NUMBER NC 1 –IN 2 +IN 3 VS– – + 4 8 NC 7 VS+ 6 VOUT 5 NC S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 190°C/ W LT1800CS8 LT1800IS8 1800 1800I 5 VS+ VOUT 1 –2 VS +IN 3 S8 PART MARKING ORDER PART NUMBER TOP VIEW LT1800CS5 LT1800IS5 – + TOP VIEW 4 –IN S5 PART MARKING S5 PACKAGE 5-LEAD PLASTIC SOT-23 LTRN LTRP TJMAX = 150°C, θJA = 250°C/ W Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage VCM = 0V VCM = 0V (SOT-23) VCM = VS VCM = VS (SOT-23) ∆VOS Input Offset Shift IB Input Bias Current IOS Input Offset Current VCM = 1V VCM = VS MIN TYP MAX UNITS 75 300 0.5 0.7 350 750 3 3.5 µV µV mV mV VCM = 0V to VS – 1.5V 20 180 µV VCM = 1V VCM = VS 25 500 250 1500 nA nA 25 25 200 200 nA nA Input Noise Voltage 0.1Hz to 10Hz 1.4 µVP-P en Input Noise Voltage Density f = 10kHz 8.5 nV/√Hz in Input Noise Current Density f = 10kHz 1 pA/√Hz CIN Input Capacitance f = 100kHz 2 pF AVOL Large-Signal Voltage Gain VS = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2 VS = 5V, VO = 1V to 4V, RL = 100Ω at VS/2 VS = 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2 35 3.5 30 85 8 85 V/mV V/mV V/mV CMRR Common Mode Rejection Ratio VS = 5V, VCM = 0V to 3.5V VS = 3V, VCM = 0V to 1.5V 85 78 105 97 dB dB Input Common Mode Range PSRR Power Supply Rejection Ratio Minimum Supply Voltage (Note 6) 0 VS = 2.5V to 10V, VCM = 0V 80 VS 97 2.3 V dB 2.5 V 1800f 2 LT1800 ELECTRICAL CHARACTERISTICS TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. SYMBOL PARAMETER VOL Output Voltage Swing Low (Note 7) VOH Output Voltage Swing High (Note 7) ISC Short-Circuit Current IS GBW SR FPBW HD tS ∆G ∆θ Supply Current per Amplifier Gain Bandwidth Product Slew Rate Full Power Bandwidth Harmonic Distortion Settling Time Differential Gain (NTSC) Differential Phase (NTSC) CONDITIONS No Load ISINK = 5mA ISINK = 20mA No Load ISOURCE = 5mA ISOURCE = 20mA VS = 5V VS = 3V MIN 20 20 Frequency = 2MHz VS = 5V, AV = – 1, RL = 1k, VO = 4V VS = 5V, VOUT = 4VP-P VS = 5V, AV = 1, RL = 1k, VO = 2VP-P, fC = 500kHz 0.01%, VS = 5V, VSTEP = 2V, AV = 1, RL = 1k VS = 5V, AV = + 2, RL = 150Ω VS = 5V, AV = + 2, RL = 150Ω 40 13 TYP 12 80 225 16 120 450 45 40 1.6 80 25 2 –75 250 0.35 0.4 MAX 50 160 450 60 250 750 TYP 125 300 0.6 0.7 30 1.5 50 550 25 25 75 6 75 101 93 MAX 500 1250 3.5 3.75 275 5 300 1750 250 250 2 UNITS mV mV mV mV mV mV mA mA mA MHz V/µs MHz dBc ns % Deg The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. SYMBOL PARAMETER VOS Input Offset Voltage ∆VOS VOS TC IB Input Offset Shift Input Offset Voltage Drift (Note 8) Input Bias Current IOS Input Offset Current AVOL Large-Signal Voltage Gain CMRR Common Mode Rejection Ratio VOL Input Common Mode Range Power Supply Rejection Ratio Minimum Supply Voltage (Note 6) Output Voltage Swing Low (Note 7) VOH Output Voltage Swing High (Note 7) ISC Short-Circuit Current IS GBW SR Supply Current per Amplifier Gain Bandwidth Product Slew Rate PSRR CONDITIONS VCM = 0V VCM = 0V (SOT-23) VCM = VS VCM = VS (SOT-23) VCM = 0V to VS – 1.5V MIN ● ● ● ● ● ● VCM = 1V VCM = VS – 0.2V VCM = 1V VCM = VS – 0.2V VS = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2 VS = 5V, VO = 1V to 4V, RL = 100Ω at VS/2 VS = 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2 VS = 5V, VCM = 0V to 3.5V VS = 3V, VCM = 0V to 1.5V ● ● ● ● ● ● ● ● ● ● VS = 2.5V to 10V, VCM = 0V ● 30 3 25 82 74 0 74 ● No Load ISINK = 5mA ISINK = 20mA No Load ISOURCE = 5mA ISOURCE = 20mA VS = 5V VS = 3V ● ● ● ● ● ● ● ● 20 20 ● Frequency = 2MHz VS = 5V, AV = – 1, RL = 1k, VO = 4VP-P ● ● 35 11 VS 91 2.3 14 100 300 25 150 600 40 30 2 75 22 2.5 60 200 550 80 300 950 2.75 UNITS µV µV mV mV µV µV/°C nA nA nA nA V/mV V/mV V/mV dB dB V dB V mV mV mV mV mV mV mA mA mA MHz V/µs 1800f 3 LT1800 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the temperature range of – 40°C ≤ TA ≤ 85°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage VCM = 0V VCM = 0V (SOT-23) VCM = VS VCM = VS (SOT-23) ● ● ● ● TYP MAX UNITS 175 400 0.75 0.9 700 2000 4 4 µV µV mV mV ∆VOS Input Offset Shift VCM = 0V to VS – 1.5V VOS TC Input Offset Voltage Drift (Note 8) ● 30 300 ● 1.5 5 IB Input Bias Current VCM = 1V VCM = VS – 0.2V ● ● 50 600 400 2000 nA nA IOS Input Offset Current VCM = 1V VCM = VS – 0.2V ● ● 25 25 300 300 nA nA AVOL Large-Signal Voltage Gain VS = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2 VS = 5V, VO = 1.5V to 3.5V, RL = 100Ω at VS/2 VS = 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2 ● ● ● 25 2.5 20 65 6 65 V/mV V/mV V/mV CMRR Common Mode Rejection Ratio VS = 5V, VCM = 0V to 3.5V VS = 3V, VCM = 0V to 1.5V ● ● 81 73 101 93 dB dB Input Common Mode Range PSRR Power Supply Rejection Ratio VS = 2.5V to 10V, VCM = 0V Minimum Supply Voltage (Note 6) MIN ● 0 ● 73 VS 90 µV µV/°C V dB ● 2.3 2.5 V VOL Output Voltage Swing Low (Note 7) No Load ISINK = 5mA ISINK = 10mA ● ● ● 15 105 170 70 210 400 mV mV mV VOH Output Voltage Swing High (Note 7) No Load ISOURCE = 5mA ISOURCE = 10mA ● ● ● 25 150 300 90 350 700 mV mV mV ISC Short-Circuit Current VS = 5V VS = 3V ● ● 12.5 12.5 30 30 2.1 mA mA IS Supply Current per Amplifier GBW Gain Bandwidth Product Frequency = 2MHz ● 30 70 MHz SR Slew Rate VS = 5V, AV = – 1, RL = 1k, VO = 4V ● 10 18 V/µs MIN ● 3 mA TA = 25°C, VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS TYP MAX UNITS VOS Input Offset Voltage 150 400 0.7 1 500 1000 3.5 4.5 µV µV mV mV ∆VOS Input Offset Shift 30 475 µV IB Input Bias Current 25 400 350 1500 nA nA IOS Input Offset Current VCM = VS– VCM = VS– (SOT-23) VCM = VS+ VCM = VS+ (SOT-23) VCM = VS– to VS+ – 1.5V VCM = VS– + 1V VCM = VS+ VCM = VS– + 1V VCM = VS+ 20 20 250 250 nA nA Input Noise Voltage 0.1Hz to 10Hz 1.4 µVP-P en Input Noise Voltage Density f = 10kHz 8.5 nV/√Hz in Input Noise Current Density f = 10kHz 1 pA/√Hz CIN Input Capacitance f = 100kHz 2 pF 1800f 4 LT1800 ELECTRICAL CHARACTERISTICS TA = 25°C, VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP AVOL Large-Signal Voltage Gain VO = –4V to 4V, RL = 1k VO = –2V to 2V, RL = 100Ω 25 2.5 70 7 CMRR Common Mode Rejection Ratio VCM = VS– to 3.5V 85 109 Input Common Mode Range VS – MAX UNITS V/mV V/mV dB VS + V PSRR Power Supply Rejection Ratio VS+ = 2.5V to 10V, VS– = 0V VOL Output Voltage Swing Low (Note 7) No Load ISINK = 5mA ISINK = 20mA 15 85 225 60 170 450 mV mV mV VOH Output Voltage Swing High (Note 7) No Load ISOURCE = 5mA ISOURCE = 20mA 17 130 450 70 260 750 mV mV mV ISC Short-Circuit Current IS Supply Current per Amplifier 2.75 mA GBW Gain Bandwidth Product Frequency = 2MHz SR Slew Rate AV = – 1, RL = 1k, VO = ±4V, Measured at VO = ±2V 23 V/µs FPBW Full Power Bandwidth VO = 8VP-P 0.9 MHz HD Harmonic Distortion AV = 1, RL = 1k, VO = 2VP-P, fC = 500kHz –75 dBc tS Settling Time 0.01%, VSTEP = 5V, AV = 1V, RL = 1k 300 ns ∆G Differential Gain (NTSC) AV = + 2, RL = 150Ω 0.35 % ∆θ Differential Phase (NTSC) AV = + 2, RL = 150Ω 0.2 Deg 80 30 97 dB 50 1.8 mA 70 MHz The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage VCM = VS– VCM = VS– (SOT-23) VCM = VS+ VCM = VS+ (SOT-23) ● ● ● ● MIN TYP MAX UNITS 200 450 0.75 1 800 1500 4 5 µV µV mV mV ∆VOS Input Offset Shift VCM = VS– to VS+ – 1.5V VOS TC Input Offset Voltage Drift (Note 8) ● 45 675 ● 1.5 5 IB Input Bias Current VCM = VS– + 1V VCM = VS+ – 0.2V ● ● 30 450 400 1750 nA nA IOS Input Offset Current VCM = VS– + 1V VCM = VS+ – 0.2V ● ● 25 25 300 300 nA nA AVOL Large-Signal Voltage Gain VO = –4V to 4V, RL = 1k VO = –2V to 2V, RL = 100Ω ● ● CMRR Common Mode Rejection Ratio VCM = VS– to 3.5V Input Common Mode Range = 2.5V to 10V, VS– 20 2 55 5 ● 82 105 ● VS– ● 74 µV µV/°C V/mV V/mV dB VS+ V PSRR Power Supply Rejection Ratio VS+ VOL Output Voltage Swing Low (Note 7) No Load ISINK = 5mA ISINK = 20mA ● ● ● 17 105 250 70 210 575 mV mV mV VOH Output Voltage Swing High (Note 7) No Load ISOURCE = 5mA ISOURCE = 20mA ● ● ● 25 150 600 90 310 975 mV mV mV = 0V 91 dB 1800f 5 LT1800 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP 25 45 ISC Short-Circuit Current ● IS Supply Current per Amplifier ● 2.4 MAX UNITS mA 3.5 mA GBW Gain Bandwidth Product Frequency = 2MHz ● 70 MHz SR Slew Rate AV = – 1, RL = 1k, VO = ±4V, Measured at VO = ±2V ● 20 V/µs The ● denotes the specifications which apply over the temperature range of – 40°C ≤ TA ≤ 85°C. VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS TYP MAX UNITS VOS Input Offset Voltage VCM = VS– VCM = VS– (SOT-23) VCM = VS+ VCM = VS+ (SOT-23) ● ● ● ● MIN 350 500 0.75 1 900 2250 4.5 5.5 µV µV mV mV ∆VOS Input Offset Shift VCM = VS– to VS+ – 1.5V ● 50 750 µV VOS TC Input Offset Voltage Drift (Note 8) ● 1.5 5 IB Input Bias Current VCM = VS– + 1V VCM = VS+ – 0.2V ● ● 50 450 450 2000 nA nA IOS Input Offset Current VCM = VS– + 1V VCM = VS+ – 0.2V ● ● 25 25 350 350 nA nA AVOL Large-Signal Voltage Gain VO = –4V to 4V, RL = 1k VO = –1V to 1V, RL = 100Ω ● ● 16 2 55 5 CMRR Common Mode Rejection Ratio VCM = VS– to 3.5V ● 81 104 – Input Common Mode Range µV/°C V/mV V/mV dB VS+ ● VS PSRR Power Supply Rejection Ratio VS+ = 2.5V to 10V, VS– = 0V ● 73 VOL Output Voltage Swing Low (Note 7) No Load ISINK = 5mA ISINK = 10mA ● ● ● 15 105 170 80 220 400 mV mV mV VOH Output Voltage Swing High (Note 7) No Load ISOURCE = 5mA ISOURCE = 10mA ● ● ● 25 150 300 100 350 700 mV mV mV ISC Short-Circuit Current ● IS Supply Current per Amplifier ● 2.6 4 mA 12.5 90 V dB 30 mA GBW Gain Bandwidth Product Frequency = 2MHz ● 65 MHz SR Slew Rate AV = – 1, RL = 1k, VO = ±4V, Measured at VO = ±2V ● 15 V/µs Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: The inputs are protected by back-to-back diodes and by ESD diodes to the supply rails. If the differential input voltage exceeds 1.4V or either input goes outside the rails, the input current should be limited to less than 10mA. Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted indefinitely. Note 4: The LT1800C/LT1800I are guaranteed functional over the temperature range of – 40°C to 85°C. Note 5: The LT1800C is guaranteed to meet specified performance from 0°C to 70°C. The LT1800C is designed, characterized and expected to meet specified performance from –40°C to 85°C but is not tested or QA sampled at these temperatures. The LT1800I is guaranteed to meet specified performance from –40°C to 85°C. Note 6: Minimum supply voltage is guaranteed by power supply rejection ratio test. Note 7: Output voltage swings are measured between the output and power supply rails. Note 8: This parameter is not 100% tested. 1800f 6 LT1800 U W TYPICAL PERFOR A CE CHARACTERISTICS VOS Distribution, VCM = 0V (SO-8, PNP Stage) 45 VS = 5V, 0V VCM = 0V 40 PERCENT OF UNITS (%) PERCENT OF UNITS (%) 35 30 25 20 15 10 5 40 VS = 5V, 0V VCM = 5V 40 35 35 30 25 20 15 10 20 15 10 5 –150 –50 50 150 INPUT OFFSET VOLTAGE (µV) 0 –2000 250 –1200 –400 400 1200 INPUT OFFSET VOLTAGE (µV) 1800 G01 500 4 TA = –55°C SUPPLY CURRENT (mA) 400 25 20 15 10 TA = 25°C 2 VS = 5V, 0V TYPICAL PART 300 TA = 125°C 3 1250 Offset Voltage vs Input Common Mode Voltage Supply Current vs Supply Voltage VS = 5V, 0V VCM = 5V 30 750 –750 –250 250 INPUT OFFSET VOLTAGE (µV) 1800 G38 OFFSET VOLTAGE (µV) 35 0 –1250 2000 1800 G02 VOS Distribution, VCM = 5V (SOT-23, NPN Stage) PERCENT OF UNITS (%) 25 5 0 –250 VS = 5V, 0V VCM = 0V 30 PERCENT OF UNITS (%) 45 VOS Distribution, VCM = 0V (SOT-23, PNP Stage) VOS Distribution, VCM = 5V (SO-8, NPN Stage) TA = –55°C 200 TA = 25°C 100 0 –100 –200 1 TA = 125°C –300 5 –400 0 –2500 –1500 –500 500 1500 INPUT OFFSET VOLTAGE (µV) 0 2500 –500 0 1 2 3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V) 1800 G39 Input Bias Current vs Temperature 0.6 0.4 0.2 0 –0.2 –0.4 0.5 0.3 0.2 0 –0.8 –1 0 2 3 4 5 1 INPUT COMMON MODE VOLTAGE (V) 6 1800 G05 NPN ACTIVE VS = 5V, 0V VCM = 5V 0.4 0.1 –0.6 –1.0 10 0.7 INPUT BIAS (µA) INPUT BIAS CURRENT (µA) 0.6 Output Saturation Voltage vs Load Current (Output Low) 0.8 VS = 5V, 0V TA = 25°C TA = 125°C TA = –55°C PNP ACTIVE VS = 5V, 0V VCM = 1V –0.1 20 –60 –40 –20 0 40 TEMPERATURE (°C) 5 1800 G04 OUTPUT SATURATION VOLTAGE (V) 1.0 1 3 4 2 INPUT COMMON MODE VOLTAGE (V) 1800 G03 Input Bias Current vs Common Mode Voltage 0.8 0 60 80 1800 G06 VS = 5V, 0V 1 0.1 TA = 125°C 0.01 TA = –55°C 0.001 0.01 TA = 25°C 1 10 0.1 LOAD CURRENT (mA) 100 1800 G07 1800f 7 LT1800 U W TYPICAL PERFOR A CE CHARACTERISTICS Output Saturation Voltage vs Load Current (Output High) 1 0.1 TA = 125°C 0.01 TA = –55°C 0.001 0.01 TA = 25°C OUTPUT SHORT-CIRCUIT CURRENT (mA) 0.6 VS = 5V, 0V CHANGE IN OFFSET VOLTAGE (mV) TA = –55°C 0.4 0.2 TA = 25°C 0 –0.2 TA = 125°C –0.4 –0.6 1 10 0.1 LOAD CURRENT (mA) 0 100 1.5 2 2.5 3 3.5 4 4.5 TOTAL SUPPLY VOLTAGE (V) 1800 G08 CHANGE IN OFFSET VOLTAGE (µV) CHANGE IN OFFSET VOLTAGE (µV) 1200 800 RL = 1k 0 –400 RL = 100Ω –1200 VS = 5V, 0V RL TO GND 1600 1200 800 400 RL = 1k 0 –400 –800 RL = 100Ω –1200 0 0.5 1 1.5 2 2.5 3 3.5 4 OUTPUT VOLTAGE (V) 1800 G11 –400 –800 1.0 100 –0.5 TA = 25°C TA = 125°C –1.0 4.5 5 60 70 VS = ±1.5V 1800 G14 80 100 120 60 TIME AFTER POWER-UP (SECONDS) 20 40 40 140 1800 G15 NPN ACTIVE VCM = 4.25V 30 20 10 TYPICAL PART 0 VS = 5V, 0V 50 VS = ±2.5V 60 5 Input Noise Voltage vs Frequency 90 80 4 1800 G13 VS = ±5V 40 45 –5 –4 –3 –2 –1 0 1 2 3 OUTPUT VOLTAGE (V) 60 50 –1.5 –2.0 15 30 –60 –45 –30 –15 0 OUTPUT CURRENT (mA) RL = 100Ω –1200 NOISE VOLTAGE (nV/√Hz) 110 OFFSET VOLTAGE (µV) CHANGE IN OFFSET VOLTAGE (mV) VS = ±5V 1.5 5 RL = 1k 0 120 0 4 2.5 4.5 3.5 3 POWER SUPPLY VOLTAGE (±V) VS = ±5V RL TO GND Warm-Up Drift vs Time (LT1800S8) TA = –55°C 2 1800 G12 Offset Voltage vs Output Current 0.5 TA = 25°C 400 –1600 2.0 TA = 125°C 800 –2000 3 SOURCING 1200 –1600 2.5 TA = –55°C 1600 –2000 1.5 2 1 OUTPUT VOLTAGE (V) SINKING VS = 5V, 0V 2000 –1600 0.5 TA = –55°C 1800 G10 –2000 0 TA = 125°C Open-Loop Gain 2000 VS = 3V, 0V RL TO GND TA = 25°C 1.5 5.5 Open-Loop Gain 1600 –800 70 60 50 40 30 20 10 0 –10 –20 –30 –40 –50 –60 –70 1800 G09 Open-Loop Gain 2000 400 5 CHANGE IN OFFSET VOLTAGE (µV) OUTPUT SATURATION VOLTAGE (V) 10 Output Short-Circuit Current vs Power Supply Voltage Minimum Supply Voltage PNP ACTIVE VCM = 2.5V 0 0.01 0.1 1 10 FREQUENCY (kHz) 100 1800 G16 1800f 8 LT1800 U W TYPICAL PERFOR A CE CHARACTERISTICS 0.1Hz to 10Hz Output Voltage Noise Input Current Noise vs Frequency 3.0 2000 VS = 5V, 0V PNP ACTIVE VCM = 2.5V 1.5 1.0 NPN ACTIVE VCM = 4.25V 1000 GAIN BANDWIDTH (MHz) OUTPUT NOISE VOLTAGE (nV) 2.0 0 0.01 0 –1000 1 10 FREQUENCY (kHz) 100 60 PHASE MARGIN 50 40 2 3 4 5 6 7 TIME (SECONDS) 8 50 40 SLEW RATE (V/µs) 60 PHASE MARGIN VS = ±5V 30 AV = –1 RF = RG = 1k RL = 1k 5 25 45 65 TEMPERATURE (°C) 1800 G19 VS = ±2.5V 70 100 60 80 PHASE VS = ±5V 25 20 50 60 40 40 20 30 GAIN 20 10 –20 0 –40 –60 5 25 45 65 85 105 125 TEMPERATURE (°C) –30 0.01 0.1 Gain vs Frequency (AV = 1) Gain vs Frequency (AV = 2) 6 OUTPUT IMPEDANCE (Ω) GAIN (dB) 9 6 VS = ±2.5V 3 VS = ±5V –6 0 –9 –3 100 300 1800 G23 –6 0.1 VS = ±2.5V 100 12 VS = ±5V –100 100 300 Output Impedance vs Frequency 600 RL = 1k 15 CL = 10pF AV = 2 RL = 1k 9 CL = 10pF AV = 1 –3 1 10 FREQUENCY (MHz) 1800 G22 18 VS = ±2.5V –80 1800 G21 12 1 10 FREQUENCY (MHz) VS = ±2.5V VS = ±5V –20 10 –55 –35 –15 1800 G20 3 0 –10 15 10 85 105 125 10 Gain and Phase vs Frequency 20 –55 –35 –15 9 PHASE (DEG) 60 PHASE MARGIN (DEG) GBW PRODUCT VS = ±5V PHASE MARGIN VS = ±2.5V 2 3 4 5 6 7 8 TOTAL SUPPLY VOLTAGE (V) 1 0 OPEN-LOOP GAIN (dB) 30 80 50 10 Slew Rate vs Temperature GBW PRODUCT VS = ±2.5V 70 9 1800 G18 35 90 GAIN BANDWIDTH (MHz) 60 20 1 0 100 –12 0.1 70 –2000 0.1 Gain Bandwidth and Phase Margin vs Temperature 0 GAIN BANDWIDTH PRODUCT 80 30 1800 G17 GAIN (dB) TA = 25°C PHASE MARGIN (DEG) NOISE CURRENT (pA/√Hz) 100 VS = 5V, 0V 90 2.5 0.5 Gain Bandwidth and Phase Margin vs Supply Voltage 10 AV = 10 AV = 1 1 AV = 2 0.1 0.01 1 10 FREQUENCY (MHz) 100 300 1800 G24 0.001 0.1 1 10 FREQUENCY (MHz) 100 500 1800 G25 1800f 9 LT1800 U W TYPICAL PERFOR A CE CHARACTERISTICS Common Mode Rejection Ratio vs Frequency 90 100 80 60 40 20 0.1 1 10 FREQUENCY (MHz) NEGATIVE SUPPLY 40 30 20 10 –50 40 35 ROS = 10Ω 20 ROS = 20Ω 15 10 DISTORTION (dBc) OVERSHOOT (%) 45 25 ROS = RL = 50Ω 0 100 1000 CAPACITIVE LOAD (pF) 10 20 ROS = RL = 50Ω 5 0 0.01 0.1 1 FREQUENCY (MHz) 10 10000 100 1000 CAPACITIVE LOAD (pF) 10 100 10000 1800 G28 Distortion vs Frequency –40 VS = 5V, 0V AV = 1 VOUT = 2VP-P –60 –50 RL = 150Ω, 2ND –70 RL = 1k, 2ND RL = 150Ω, 3RD –80 –90 –100 5 ROS = 20Ω 25 Distortion vs Frequency –40 30 30 1800 G27 VS = 5V, 0V AV = 2 50 35 10 0 Series Output Resistor vs Capacitive Load 55 ROS = 10Ω 40 15 1800 G26 60 45 POSITIVE SUPPLY 50 –10 0.001 100 50 70 60 VS = 5V, 0V AV = 1 55 0.1 1 FREQUENCY (MHz) 1800 G29 VS = 5V, 0V AV = 2 VOUT = 2VP-P –60 RL = 150Ω, 2ND RL = 1k, 2ND RL = 150Ω, 3RD –70 –80 –90 –100 RL = 1k, 3RD –110 0.01 DISTORTION (dBc) 0 0.01 60 VS = 5V, 0V TA = 25°C 80 OVERSHOOT (%) VS = 5V, 0V POWER SUPPLY REJECTION RATIO (dB) COMMON MODE REJECTION RATIO (dB) 120 Series Output Resistor vs Capacitive Load Power Supply Rejection Ratio vs Frequency RL = 1k, 3RD 10 –110 0.01 0.1 1 FREQUENCY (MHz) 1800 G30 Maximum Undistorted Output Signal vs Frequency 10 1800 G31 5V Small-Signal Response 5V Large-Signal Response OUTPUT VOLTAGE SWING (VP-P) 4.6 4.5 4.4 50mV/DIV AV = 2 1V/DIV 4.3 0V AV = –1 4.2 0V 4.1 4.0 VS = 5V, 0V RL = 1k 3.9 1k 10k 100k 1M FREQUENCY (Hz) 10M VS = 5V, 0V AV = 1 RL = 1k 100ns/DIV 1800 G33 VS = 5V, 0V AV = 1 RL = 1k 50ns/DIV 1800 G34 1800 G32 1800f 10 LT1800 U W TYPICAL PERFOR A CE CHARACTERISTICS ±5V Small-Signal Response ±5V Large-Signal Response Output Overdriven Recovery 2V/DIV 50mV/DIV VIN 1V/DIV 0V 0V 0V VOUT 2V/DIV 0V 200ns/DIV VS = ±5V AV = 1 RL = 1k 1800 G35 50ns/DIV VS = 5V, 0V AV = 2 RL = 1k 1800 G36 100ns/DIV 1800 G37 U VS = ±5V AV = 1 RL = 1k W U U APPLICATIO S I FOR ATIO Circuit Description the positive supply. As the input voltage moves closer toward the positive supply, the transistor Q5 will steer the tail current I1 to the current mirror Q6/Q7, activating the NPN differential pair and the PNP pair becomes inactive for the rest of the input common mode range up to the positive supply. Also at the input stage, devices Q17 to Q19 act to cancel the bias current of the PNP input pair. When Q1-Q2 are active, the current in Q16 is controlled to be the same as the current in Q1-Q2, thus the base current The LT1800 has an input and output signal range that covers from the negative power supply to the positive power supply. Figure 1 depicts a simplified schematic of the amplifier. The input stage is comprised of two differential amplifiers, a PNP stage Q1/Q2 and an NPN stage Q3/ Q4 that are active over the different ranges of common mode input voltage. The PNP differential pair is active between the negative supply to approximately 1.2V below V+ R3 V+ + R5 V– ESDD1 I2 R4 + D1 ESDD2 Q12 Q11 I1 Q13 +IN D6 D5 D8 D2 Q5 OUT D3 BUFFER AND OUTPUT BIAS Q10 V+ D4 Q9 Q16 Q17 Q18 V– Q1 Q2 ESDD3 V– I3 CC Q4 Q3 ESDD4 + VBIAS D7 –IN Q15 C2 Q8 C1 Q19 Q7 Q14 Q6 R1 V– R2 1800 F01 Figure 1. LT1800 Simplified Schematic Diagram 1800f 11 LT1800 U W U U APPLICATIO S I FOR ATIO of Q16 is nominally equal to the base current of the input devices. The base current of Q16 is then mirrored by devices Q17-Q19 to cancel the base current of the input devices Q1-Q2. A pair of complementary common emitter stages Q14/Q15 that enable the output to swing from rail to rail constructs the output stage. The capacitors C2 and C3 form the local feedback loops that lower the output impedance at high frequency. These devices are fabricated on Linear Technology’s proprietary high-speed complementary bipolar process. Power Dissipation The LT1800 amplifier is offered in a small package, SOT-23, which has a thermal resistance of 250°C/W, θJA. So there is a need to ensure that the die’s junction temperature should not exceed 150°C. Junction temperature TJ is calculated from the ambient temperature TA, power dissipation PD and thermal resistance θJA: TJ = TA + (PD • θJA) The power dissipation in the IC is the function of the supply voltage, output voltage and the load resistance. For a given supply voltage, the worst-case power dissipation PDMAX occurs at the maximum supply current and the output voltage is at half of either supply voltage (or the maximum swing is less than 1/2 supply voltage). PDMAX is given by: PDMAX = (VS • ISMAX) + (VS/2)2/RL Example: An LT1800 in a SOT-23 package operating on ±5V supplies and driving a 50Ω load, the worst-case power dissipation is given by: PDMAX = (10 • 4mA) + (2.5)2/50 = 0.04 + 0.125 = 0.165W The maximum ambient temperature that the part is allowed to operate is: TA = TJ – (PDMAX • 250°C/W) = 150°C – (0.165W • 250°C/W) = 108°C Input Offset Voltage The offset voltage will change depending upon which input stage is active. The PNP input stage is active from the negative supply rail to 1.2V of the positive supply rail, then the NPN input stage is activated for the remaining input range up to the positive supply rail during which the PNP stage remains inactive. The offset voltage is typically less than 75µV in the range that the PNP input stage is active. Input Bias Current The LT1800 employs a patent-pending technique to trim the input bias current to less than 250nA for the input common mode voltage of 0.2V above negative supply rail to 1.2V of the positive rail. The low input offset voltage and low input bias current of the LT1800 provide the precision performance especially for high source impedance applications. Output The LT1800 can deliver a large output current, so the short-circuit current limit is set around 50mA to prevent damage to the device. Attention must be paid to keep the junction temperature of the IC below the absolute maximum rating of 150°C (refer to the Power Dissipation section) when the output is continuously short circuited. The output of the amplifier has reverse-biased diodes connected to each supply. If the output is forced beyond either supply, unlimited current will flow through these diodes. If the current is transient and limited to several hundred mA, and the total supply voltage is less than 12.6V, the absolute maximum rating, no damage will occur to the device. Overdrive Protection When the input voltage exceeds the power supplies, two pairs of crossing diodes D1 to D4 will prevent the output from reversing polarity. If the input voltage exceeds either power supply by 700mV, diode D1/D2 or D3/D4 will turn on to keep the output at the proper polarity. For the phase reversal protection to perform properly, the input current must be limited to less than 10mA. If the amplifier is severely overdriven, an external resistor should be used to limit the overdrive current. The LT1800’s input stages are also protected against a large differential input voltage of 1.4V or higher by a pair of back-back diodes D5/D8 to prevent the emitter-base breakdown of the input transistors. The current in these 1800f 12 LT1800 U W U U APPLICATIO S I FOR ATIO diodes should be limited to less than 10mA when they are active. The worst-case differential input voltage usually occurs when the input is driven while the output is shorted to ground in a unity gain configuration. In addition, the amplifier is protected against ESD strikes up to 3kV on all pins by a pair of protection diodes on each pin that are connected to the power supplies as shown in Figure1. Capacitive Load The LT1800 is optimized for high bandwidth, low power and precision applications. It can drive a capacitive load of about 75pF in a unity gain configuration, and more for higher gain. When driving a larger capacitive load, a resistor of 10Ω to 50Ω should be connected between the output and the capacitive load to avoid ringing or oscillation. The feedback should still be taken from the output so that the resistor will isolate the capacitive load to ensure stability. Graphs on capacitive loads indicate the transient response of the amplifier when driving capacitive load with a specified series resistor. Feedback Components When feedback resistors are used to set up gain, care must be taken to ensure that the pole formed by the feedback resistors and the total capacitance at the inverting input does not degrade stability. For instance, the LT1800 in a noninverting gain of 2, set up with two 5k resistors and a capacitance of 5pF (part plus PC board) will probably ring in transient response. The pole is formed at 12.7MHz that will reduce phase margin by 32 degrees when the crossover frequency of the amplifier is around 20MHz. A capacitor of 5pF or higher connected across the feedback resistor will eliminate any ringing or oscillation. U W U U APPLICATIO S I FOR ATIO Single Supply 1A Laser Driver Amplifier Fast 1A Current Sense Amplifier The circuit in the front page of this data sheet shows the LT1800 used in a 1A laser driver application. One of the reasons the LT1800 is well suited to this control task is that its 2.3V operation ensures that it will be awake during power-up and operated before the circuit can otherwise cause significant current to flow in the 2.1V threshold laser diode. Driving the noninverting input of the LT1800 to a voltage VIN will control the turning on of the high current NPN transistor, FMMT619 and the laser diode. A current equal to VIN/R1 flows through the laser diode. The LT1800 low offset voltage and low input bias current allows it to control the current that flows through the laser diode precisely. The overall circuit is a 1A per Volt V-to-I converter. Frequency compensation components R2 and C1 are selected for fast but zero-overshoot time domain response to avoid overcurrent conditions in the laser. The time domain response of this circuit, measured at R1 and given a 500mV 230ns input pulse, is also shown in the graphic on the front page. While the circuit is capable of 1A operation, the laser diode and the transistor are thermally limited due to power dissipation, so they must be operated at low duty cycles. A simple, fast current sense amplifier in Figure 2 is suitable for quickly responding to out-of-range currents. The circuit amplifies the voltage across the 0.1Ω sense resistor by a gain of 20, resulting in a conversion gain of 2V/A. The –3dB bandwidth of the circuit is 4MHz, and the uncertainty due to VOS and IB is less than 4mA. The minimum output voltage is 60mV, corresponding to 30mA. The large-signal response of the circuit is shown in Figure 3. IL 0A TO 1A 52.3Ω 3V + – 0.1Ω 52.3Ω VOUT 0V TO 2V LT1800 1k 1800 F02 VOUT = 2 • IL f–3dB = 4MHz UNCERTAINTY DUE TO VOS, IB < 4mA Figure 2. Fast 1A Current Sense 1800f 13 LT1800 U TYPICAL APPLICATIO S Single 3V Supply, 1MHz, 4th Order Butterworth Filter 500mV/DIV 0V VS = 3V 50ns/DIV 1800 F03 Figure 3. Current Sense Amplifier Large-Signal Response 909Ω VIN 909Ω The circuit shown in Figure 4 makes use of the low voltage operation and the wide bandwidth of the LT1800 to create a DC accurate 1MHz 4th order lowpass filter powered from a 3V supply. The amplifiers are configured in the inverting mode for the lowest distortion and the output can swing rail-to-rail for maximum dynamic range. Figure 5 displays the frequency response of the filter. Stopband attenuation is greater than 100dB at 50MHz. With a 2.25VP-P, 250kHz input signal, the filter has harmonic distortion products of less than –85dBc. Worst case output offset voltage is less than 6mV. 47pF – 2.67k 1.1k 1.1k 220pF + 22pF 3V – 2.21k LT1800 470pF + LT1800 VOUT VS/2 1800 F04 Figure 4. 3V, 1MHz, 4th Order Butterworth Filter 0 GAIN (dB) –20 –40 –60 –80 –100 –120 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 1800 F05 Figure 5. Frequency Response of Filter 1800f 14 LT1800 U PACKAGE DESCRIPTIO S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 3.85 MAX 2.62 REF 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 1.90 BSC 0.09 – 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 S5 TSOT-23 0302 S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 0.189 – 0.197* (4.801 – 5.004) 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 8 7 6 5 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) SO8 1298 1 2 3 4 1800f 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 LT1800 U TYPICAL APPLICATIO Low Power High Voltage Amplifier Certain materials used in optical applications have characteristics that change due to the presence and strength of a DC electric field. The voltage applied across these materials should be precisely controlled to maintain desired properties, sometimes as high as 100’s of volts. The materials are not conductive and represent a capacitive load. The circuit of Figure 6 shows the LT1800 used in an amplifier capable of a 250V output swing and providing 130V 5V 4.99k 10k 1k Q5 Q6 0.1µF 5V Q2 Q1 + R2 2k precise DC output voltage. When no signal is present, the op amp output sits at about mid-supply. Transistors Q1 and Q3 create bias voltages for Q2 and Q4, which are forced into a low quiescent current by degeneration resistors R4 and R5. When a transient signal arrives at VIN, the op amp output moves and causes the current in Q2 or Q4 to change depending on the signal polarity. The current, limited by the clipping of the LT1800 output and the 3kΩ of total emitter degeneration, is mirrored to the output devices to drive the capacitive load. The LT1800 output then returns to near mid-supply, providing the precise DC output voltage to the load. The attention to limit the current of the output devices minimizes power dissipation thus allowing for dense layout, and inherits better reliability. Figure 7 shows the time domain response of the amplifier providing a 200V output swing into a 100pF load. 5V R4 2k R6 2k R5 2k R7 2k VOUT LT1800 – Q3 MATERIAL UNDER ELECTRIC FIELD 100pF VIN 2V/DIV Q4 VIN R1 2k C2 8pF 150V C1 39pF R3 200k 10k Q7 Q8 1k 4.99k –130V AV = VOUT/VIN = –100 ±130V SUPPLY IQ = 130µA OUTPUT SWING = ±128.8V OUTPUT OFFSET ≅ 20mV OUTPUT SHORT-CIRCUIT CURRENT ≅ 3mA 10% TO 90% RISE TIME ≅ 8µs, 200V OUTPUT STEP SMALL-SIGNAL BANDWIDTH ≅ 150kHz Q1, Q2, Q7, Q8: ON SEMI MPSA42 Q3, Q4, Q5, Q6: ON SEMI MPSA92 VOUT 50V/DIV 10µs/DIV 1800 F07 1800 F06 Figure 6. Low Power, High Voltage Amplifier Figure 7. Large-Signal Time Domain Response of the Amplifier RELATED PARTS PART NUMBER LT1399 LT1498/LT1499 LT1630/LT1631 DESCRIPTION Triple 300MHz Current Feedback Amplifier Dual/Quad 10MHz, 6Vµs Rail-to-Rail Input and Output C-LoadTM Op Amps Dual/Quad 30MHz, 10V/µs Rail-to-Rail Input and Output Op Amps LT1801/LT1802 LT1806/LT1807 80MHz, 25V/µs Low Power Rail-to-Rail Input/Output Precision Op Amps Single/Dual 325MHz, 140V/µs Rail-to-Rail Input and Output Op Amps LT1809/LT1810 Single/Dual 180MHz Rail-to-Rail Input/Output Op Amps COMMENTS 0.1dB Gain Flatness to 150MHz, Shutdown High DC Accuracy, 475µV VOS(MAX), 4µV/°C Max Drift, Max Supply Current 2.2mA per Amp High DC Accuracy, 525µV VOS(MAX), 70mA Output Current, Max Supply Current 4.4mA per Amplifier Dual/Quad Version of the LT1800 High DC Accuracy, 550µV VOS(MAX), Low Noise 3.5nV/√Hz, Low Distortion –80dB at 5MHz, Power-Down (LT1806) 350V/µs Slew Rate, Low Distortion –90dBc at 5MHz, Power-Down (LT1809) C-Load is a trademark of Linear Technology Corporation. 1800f 16 Linear Technology Corporation LT/TP 0402 2K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2001