LT1800 80MHz, 25V/µs Low Power Rail-to-Rail Input and Output Precision Op Amp DESCRIPTION FEATURES n n n n n n n n n n n n n 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 Operating Temperature Range: –40°C to 85°C Available in the 8-Pin SO and 5-Pin Low Profile (1mm) ThinSOT™ Packages APPLICATIONS n n n n n Low Voltage, High Frequency Signal Processing Driving A/D Converters Rail-to-Rail Buffer Amplifiers Active Filters Video Line Driver 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. 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 TSOT-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. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Single Supply 1A Laser Driver Amplifier Laser Driver Amplifier 500mA Pulse Response 5V VIN DO NOT FLOAT + – R3 10Ω LT1800 Q1 ZETEX FMMT619 C1 39pF R2 330Ω 100mA/DIV IR LASER INFINEON SFH495 R1 1Ω 1800 TA01a 50ns/DIV 1800 TA01b 1800fa 1 LT1800 ABSOLUTE MAXIMUM RATINGS (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 PIN CONFIGURATION TOP VIEW TOP VIEW –IN 2 +IN 3 – + VS– 4 8 NC 7 VS+ 6 VOUT 5 NC 5 VS+ VOUT 1 –2 VS – + NC 1 4 –IN +IN 3 S5 PACKAGE 5-LEAD PLASTIC TSOT-23 S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 250°C/W TJMAX = 150°C, θJA = 190°C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT1800CS8#PBF LT1800CS8#TRPBF 1800 8-Lead Plastic SO 0°C to 70°C LT1800IS8#PBF LT1800IS8#TRPBF 1800I 8-Lead Plastic SO –40°C to 85°C LT1800CS5#PBF LT1800CS5#TRPBF LTRN 5-Lead Plastic TSOT-23 0°C to 70°C LT1800IS5#PBF LT1800IS5#TRPBF LTRP 5-Lead Plastic TSOT-23 –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS TA = 25°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. SYMBOL PARAMETER CONDITIONS TYP MAX UNITS VOS Input Offset Voltage VCM = 0V VCM = 0V (SOT-23) VCM = VS VCM = VS (SOT-23) MIN 75 300 0.5 0.7 350 750 3 3.5 μV μV mV mV ΔVOS Input Offset Shift VCM = 0V to VS – 1.5V 20 180 μV IB Input Bias Current VCM = 1V VCM = VS 25 500 250 1500 nA nA IOS Input Offset Current VCM = 1V VCM = VS 25 25 200 200 nA nA Input Noise Voltage 0.1Hz to 10Hz 1.4 μVP-P 1800fa 2 LT1800 ELECTRICAL CHARACTERISTICS TA = 25°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. SYMBOL PARAMETER CONDITIONS en Input Noise Voltage Density f = 10kHz MIN 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 VS = 2.5V to 10V, VCM = 0V 80 Input Common Mode Range PSRR Power Supply Rejection Ratio TYP 0 Minimum Supply Voltage (Note 6) MAX VS 97 UNITS V dB 2.3 2.5 V VOL Output Voltage Swing Low (Note 7) No Load ISINK = 5mA ISINK = 20mA 12 80 225 50 160 450 mV mV mV VOH Output Voltage Swing High (Note 7) No Load ISOURCE = 5mA ISOURCE = 20mA 16 120 450 60 250 850 mV mV mV ISC Short-Circuit Current VS = 5V VS = 3V IS Supply Current per Amplifier 20 20 45 40 1.6 mA mA 2 mA GBW Gain Bandwidth Product Frequency = 2MHz 40 80 MHz SR Slew Rate VS = 5V, AV = –1, RL = 1k, VO = 4V 13 25 V/μs FPBW Full Power Bandwidth VS = 5V, VOUT = 4VP-P 2 MHz HD Harmonic Distortion VS = 5V, AV = 1, RL = 1k, VO = 2VP-P, fC = 500kHz –75 dBc tS Settling Time 0.01%, VS = 5V, VSTEP = 2V, AV = 1, RL = 1k 250 ns ΔG Differential Gain (NTSC) VS = 5V, AV = +2, RL = 150Ω 0.35 % Δθ Differential Phase (NTSC) VS = 5V, AV = +2, RL = 150Ω 0.4 Deg The l 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 CONDITIONS VOS Input Offset Voltage VCM = 0V VCM = 0V (SOT-23) VCM = VS VCM = VS (SOT-23) ΔVOS Input Offset Shift VCM = 0V to VS – 1.5V MIN TYP MAX UNITS l l l l 125 300 0.6 0.7 500 1250 3.5 3.75 μV μV mV mV l 30 275 μV VOS TC Input Offset Voltage Drift (Note 8) l 1.5 5 IB Input Bias Current VCM = 1V VCM= VS – 0.2V l l 50 550 300 1750 nA nA IOS Input Offset Current VCM = 1V VCM = VS – 0.2V l l 25 25 250 250 nA nA 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 l l l 30 3 25 75 6 75 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 l l 82 74 101 93 dB dB μV/°C 1800fa 3 LT1800 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. SYMBOL PARAMETER CONDITIONS Input Common Mode Range PSRR Power Supply Rejection Ratio VS = 2.5V to 10V, VCM = 0V Minimum Supply Voltage (Note 6) MIN l 0 l 74 TYP MAX UNITS VS 91 V dB l 2.3 2.5 V VOL Output Voltage Swing Low (Note 7) No Load ISINK = 5mA ISINK = 20mA l l l 14 100 300 60 200 550 mV mV mV VOH Output Voltage Swing High (Note 7) No Load ISOURCE = 5mA ISOURCE = 20mA l l l 25 150 600 80 300 1000 mV mV mV ISC Short-Circuit Current VS = 5V VS = 3V l l IS Supply Current per Amplifier 20 20 l 40 30 2 mA mA 2.75 mA GBW Gain Bandwidth Product Frequency = 2MHz l 35 75 MHz SR Slew Rate VS = 5V, AV = – 1, RL = 1k, VO = 4VP-P l 11 22 V/μs The l 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. SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage VCM = 0V VCM = 0V (SOT-23) VCM = VS VCM = VS (SOT-23) ΔVOS Input Offset Shift VCM = 0V to VS – 1.5V MIN TYP MAX UNITS l l l l 175 400 0.75 0.9 700 2000 4 4 μV μV mV mV l 30 300 μV VOS TC Input Offset Voltage Drift (Note 8) l 1.5 5 IB Input Bias Current VCM = 1V VCM = VS – 0.2V l l 50 600 400 2000 nA nA IOS Input Offset Current VCM = 1V VCM = VS – 0.2V l l 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 l l l 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 l l 81 73 101 93 dB dB l 0 l 73 Input Common Mode Range PSRR Power Supply Rejection Ratio VS = 2.5V to 10V, VCM = 0V Minimum Supply Voltage (Note 6) VS 90 μV/°C V dB l 2.3 2.5 V VOL Output Voltage Swing Low (Note 7) No Load ISINK = 5mA ISINK = 10mA l l l 15 105 170 70 210 400 mV mV mV VOH Output Voltage Swing High (Note 7) No Load ISOURCE = 5mA ISOURCE = 10mA l l l 25 150 300 90 350 700 mV mV mV ISC Short-Circuit Current VS = 5V VS = 3V l l IS Supply Current per Amplifier GBW Gain Bandwidth Product Frequency = 2MHz l 30 70 SR Slew Rate VS = 5V, AV = – 1, RL = 1k, VO = 4V l 10 18 12.5 12.5 l 30 30 2.1 mA mA 3 mA MHz V/μs 1800fa 4 LT1800 ELECTRICAL CHARACTERISTICS SYMBOL TA = 25°C, VS = ±5V, VCM = 0V, VOUT = 0V, unless otherwise noted. PARAMETER CONDITIONS VOS Input Offset Voltage ΔVOS Input Offset Shift IB Input Bias Current 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+ Input Noise Voltage MIN TYP MAX UNITS 150 400 0.7 1 500 1000 3.5 4.5 μV μV mV mV 30 475 μV 25 400 350 1500 nA nA 20 20 250 250 nA nA 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 VO = –4V to 4V, RL = 1k VO = –2V to 2V, RL = 100Ω 25 2.5 70 7 V/mV V/mV CMRR Common Mode Rejection Ratio VCM = VS– to 3.5V 85 109 VS– Input Common Mode Range 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 70 260 900 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 80 30 97 dB 50 1.8 mA 70 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 ΔG Differential Gain (NTSC) AV = + 2, RL = 150Ω 0.35 % Δθ Differential Phase (NTSC) AV = + 2, RL = 150Ω 0.2 Deg The l 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 ΔVOS Input Offset Shift VCM = VS– VCM = VS– (SOT-23) VCM = VS+ VCM = VS+ (SOT-23) VCM = VS– to VS+ – 1.5V VOS TC Input Offset Voltage Drift (Note 8) IB Input Bias Current VCM = VS– + 1V VCM = VS+ – 0.2V MIN TYP MAX UNITS l l l l 200 450 0.75 1 800 1500 4 5 μV μV mV mV l 45 675 μV l 1.5 5 l l 30 450 400 1750 μV/°C nA nA 1800fa 5 LT1800 ELECTRICAL CHARACTERISTICS The l 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 IOS Input Offset Current VCM = VS– + 1V VCM = VS+ – 0.2V l l AVOL Large-Signal Voltage Gain VO = –4V to 4V, RL = 1k VO = –2V to 2V, RL = 100Ω l l 20 2 55 5 CMRR Common Mode Rejection Ratio VCM = VS– to 3.5V l 82 105 – Input Common Mode Range MIN l VS l 74 TYP MAX UNITS 25 25 300 300 nA nA V/mV V/mV dB + V VS 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 l l l 17 105 250 70 210 575 mV mV mV VOH Output Voltage Swing High (Note 7) No Load ISOURCE = 5mA ISOURCE = 20mA l l l 25 150 600 90 310 1100 mV mV mV ISC Short-Circuit Current l IS Supply Current per Amplifier l 2.4 GBW Gain Bandwidth Product Frequency = 2MHz l 70 MHz SR Slew Rate AV = –1, RL = 1k, VO = ±4V, Measured at VO = ±2V l 20 V/μs 25 91 dB 45 mA 3.5 mA The l 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 VOS Input Offset Voltage VCM = VS– VCM = VS– (SOT-23) VCM = VS+ VCM = VS+ (SOT-23) l l l l MIN TYP MAX UNITS 350 500 0.75 1 900 2250 4.5 5.5 μV μV mV mV ΔVOS Input Offset Shift VCM = VS– to VS+ – 1.5V l VOS TC Input Offset Voltage Drift (Note 8) 50 750 l 1.5 5 IB Input Bias Current VCM = VS– + 1V VCM = VS+ – 0.2V l l 50 450 450 2000 nA nA IOS Input Offset Current VCM = VS– + 1V VCM = VS+ – 0.2V l l 25 25 350 350 nA nA AVOL Large-Signal Voltage Gain VO = –4V to 4V, RL = 1k VO = –1V to 1V, RL = 100Ω l l 16 2 55 5 CMRR Common Mode Rejection Ratio VCM = VS– to 3.5V l 81 104 – μV μV/°C V/mV V/mV dB + l VS PSRR Power Supply Rejection Ratio VS+ = 2.5V to 10V, VS– = 0V l 73 VOL Output Voltage Swing Low (Note 7) No Load ISINK = 5mA ISINK = 10mA l l l 15 105 170 80 220 400 mV mV mV VOH Output Voltage Swing High (Note 7) No Load ISOURCE = 5mA ISOURCE = 10mA l l l 25 150 300 100 350 700 mV mV mV ISC Short-Circuit Current l IS Supply Current per Amplifier l 2.6 GBW Gain Bandwidth Product Frequency = 2MHz l 65 MHz SR Slew Rate AV = –1, RL = 1k, VO = ±4V, Measured at VO = ±2V l 15 V/μs Input Common Mode Range 12.5 VS 90 V dB 30 mA 4 mA 1800fa 6 LT1800 ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: 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. TYPICAL PERFORMANCE CHARACTERISTICS VOS Distribution, VCM = 0V (SO-8, PNP Stage) 30 25 20 15 10 5 35 30 25 20 15 10 –150 –50 50 150 INPUT OFFSET VOLTAGE (μV) 0 –2000 250 –1200 –400 400 1200 INPUT OFFSET VOLTAGE (μV) 1800 G01 20 15 10 0 –1250 2000 500 TA = –55°C 400 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 4 VS = 5V, 0V VCM = 5V 25 750 –750 –250 250 INPUT OFFSET VOLTAGE (μV) 1800 G03 Supply Current vs Supply Voltage SUPPLY CURRENT (mA) PERCENT OF UNITS (%) 30 25 1800 G02 VOS Distribution, VCM = 5V (SOT-23, NPN Stage) 35 30 5 5 0 –250 VS = 5V, 0V VCM = 0V 35 PERCENT OF UNITS (%) 35 40 VS = 5V, 0V VCM = 5V 40 PERCENT OF UNITS (%) PERCENT OF UNITS (%) 40 45 VS = 5V, 0V VCM = 0V VOS Distribution, VCM = 0V (SOT-23, PNP Stage) OFFSET VOLTAGE (μV) 45 VOS Distribution, VCM = 5V (SO-8, NPN Stage) 200 TA = 25°C 100 0 –100 TA = –55°C –200 1 TA = 125°C –300 5 –400 0 –2500 –1500 –500 500 1500 INPUT OFFSET VOLTAGE (μV) 2500 1800 G04 0 0 1 2 3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V) 1800 G05 –500 0 1 3 4 2 INPUT COMMON MODE VOLTAGE (V) 5 1800 G06 1800fa 7 LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Input Bias Current vs Common Mode Voltage 0.2 0 –0.2 0.5 0.4 0.3 0.2 –0.4 –0.6 0.1 –0.8 0 –1.0 0 2 3 4 5 1 INPUT COMMON MODE VOLTAGE (V) –1 NPN ACTIVE VS = 5V, 0V VCM = 5V 0.6 0.4 PNP ACTIVE VS = 5V, 0V VCM = 1V –0.1 –60 6 OUTPUT SATURATION VOLTAGE (V) 0.7 INPUT BIAS (μA) INPUT BIAS CURRENT (μA) 0.6 10 0.8 VS = 5V, 0V TA = 25°C TA = 125°C TA = –55°C 0.8 Output Saturation Voltage vs Load Current (Output Low) –40 –20 0 20 40 TEMPERATURE (°C) 60 1800 G07 TA = 125°C 0.01 TA = 25°C TA = –55°C 0.4 0.2 TA = 25°C 0 –0.2 TA = 125°C –0.4 –0.6 100 0 1.5 2 2.5 3 3.5 4 4.5 TOTAL SUPPLY VOLTAGE (V) 1800 G10 CHANGE IN OFFSET VOLTAGE (μV) CHANGE IN OFFSET VOLTAGE (μV) 1200 800 RL = 1k 5 0 –400 RL = 100Ω –1200 –1600 0.5 1.5 2 1 OUTPUT VOLTAGE (V) 2.5 TA = 125°C TA = –55°C SINKING VS = 5V, 0V TA = –55°C SOURCING TA = 125°C TA = 25°C 2 4 2.5 4.5 3.5 3 POWER SUPPLY VOLTAGE (±V) 1200 800 RL = 1k 0 –400 –800 RL = 100Ω –1200 3 1800 G13 –2000 5 1800 G12 2000 1600 VS = ±5V RL TO GND 1200 800 400 0 RL = 1k –400 –800 RL = 100Ω –1200 –1600 –2000 0 TA = 25°C 1.5 5.5 VS = 5V, 0V RL TO GND 1600 400 100 Open-Loop Gain 2000 VS = 3V, 0V RL TO GND –800 TA = 25°C 1 10 0.1 LOAD CURRENT (mA) 70 60 50 40 30 20 10 0 –10 –20 –30 –40 –50 –60 –70 Open-Loop Gain 1600 TA = –55°C 1800 G11 Open-Loop Gain 2000 400 0.01 Output Short-Circuit Current vs Power Supply Voltage OUTPUT SHORT-CIRCUIT CURRENT (mA) CHANGE IN OFFSET VOLTAGE (mV) OUTPUT SATURATION VOLTAGE (V) 0.1 1 10 0.1 LOAD CURRENT (mA) TA = 125°C 1800 G09 0.6 1 0.001 0.01 0.1 Minimum Supply Voltage VS = 5V, 0V TA = –55°C 1 1800 G08 Output Saturation Voltage vs Load Current (Output High) 10 VS = 5V, 0V 0.001 0.01 80 CHANGE IN OFFSET VOLTAGE (μV) 1.0 Input Bias Current vs Temperature –1600 0 0.5 1 1.5 2 2.5 3 3.5 4 OUTPUT VOLTAGE (V) 4.5 5 1800 G14 –2000 –5 –4 –3 –2 –1 0 1 2 3 OUTPUT VOLTAGE (V) 4 5 1800 G15 1800fa 8 LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Warm-Up Drift vs Time (LT1800S8) Offset Voltage vs Output Current Input Noise Voltage vs Frequency 60 120 VS = 5V, 0V VS = ±5V 1.0 100 TA = –55°C 0.5 0 –0.5 TA = 25°C TA = 125°C 50 90 VS = ±2.5V 80 70 –1.0 60 –1.5 50 –2.0 15 30 –60 –45 –30 –15 0 OUTPUT CURRENT (mA) VS = ±5V NOISE VOLTAGE (nV/√Hz) 110 OFFSET VOLTAGE (μV) 1.5 VS = ±1.5V 40 45 80 100 120 60 TIME AFTER POWER-UP (SECONDS) 20 0 60 40 2000 OUTPUT NOISE VOLTAGE (nV) NOISE CURRENT (pA/√Hz) 2.5 2.0 PNP ACTIVE VCM = 2.5V 1.0 PNP ACTIVE VCM = 2.5V 0 0.01 140 1 10 FREQUENCY (kHz) 1800 G18 VS = 5V, 0V 1000 0 0.1 1 10 FREQUENCY (kHz) 0 100 1 2 3 4 5 6 7 TIME (SECONDS) 1800 G19 100 8 9 10 1800 G20 Gain Bandwidth and Phase Margin vs Supply Voltage Gain Bandwidth and Phase Margin vs Temperature 100 TA = 25°C 90 90 GBW PRODUCT VS = ±2.5V 60 PHASE MARGIN 50 40 70 GBW PRODUCT VS = ±5V 60 50 PHASE MARGIN VS = ±2.5V 60 50 PHASE MARGIN VS = ±5V 40 30 30 20 20 1 2 3 4 5 6 7 8 TOTAL SUPPLY VOLTAGE (V) 9 10 1800 G21 PHASE MARGIN (DEG) 60 PHASE MARGIN (DEG) 70 GAIN BANDWIDTH (MHz) 80 GAIN BANDWIDTH PRODUCT 0 100 –2000 0 0.01 80 0.1 –1000 NPN ACTIVE VCM = 4.25V 0.5 20 0.1Hz to 10Hz Output Voltage Noise VS = 5V, 0V 1.5 NPN ACTIVE VCM = 4.25V 30 1800 G17 Input Current Noise vs Frequency 3.0 40 10 TYPICAL PART 1800 G16 GAIN BANDWIDTH (MHz) CHANGE IN OFFSET VOLTAGE (mV) 2.0 –55 –35 –15 10 5 25 45 65 85 105 125 TEMPERATURE (°C) 1800 G22 1800fa 9 LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Slew Rate vs Temperature VS = ±2.5V 25 VS = ±5V 20 70 100 60 80 PHASE 50 60 40 40 20 30 GAIN 20 0 10 –20 0 –40 –60 –10 15 VS = ±2.5V VS = ±5V –20 10 –55 –35 –15 –30 0.01 5 25 45 65 85 105 125 TEMPERATURE (oC) 0.1 –80 –100 100 300 1 10 FREQUENCY (MHz) 1800 G24 1800 G23 Gain vs Frequency (AV = 1) Gain vs Frequency (AV = 2) RL = 1k 15 CL = 10pF AV = 2 12 3 VS = ±2.5V 0 VS = ±5V –3 GAIN (dB) 6 9 6 VS = ±2.5V 3 VS = ±5V –6 0 –9 –3 VS = ±2.5V 100 OUTPUT IMPEDANCE (Ω) RL = 1k 9 CL = 10pF AV = 1 GAIN (dB) Output Impedance vs Frequency 600 18 12 PHASE (DEG) SLEW RATE (V/μs) 30 AV = –1 RF = RG = 1k RL = 1k Gain and Phase vs Frequency OPEN-LOOP GAIN (dB) 35 AV = 10 10 AV = 1 1 AV = 2 0.1 0.01 10 1 FREQUENCY (MHz) 100 0.001 –6 0.1 300 10 1 FREQUENCY (MHz) 100 Common Mode Rejection Ratio vs Frequency POWER SUPPLY REJECTION RATIO (dB) COMMON MODE REJECTION RATIO (dB) 90 100 80 60 40 20 0 0.01 0.1 1 10 FREQUENCY (MHz) 100 1800 G28 10 FREQUENCY (MHz) 100 Series Output Resistor vs Capacitive Load 60 VS = 5V, 0V TA = 25°C 80 60 VS = 5V, 0V AV = 1 55 50 70 NEGATIVE SUPPLY 45 POSITIVE SUPPLY 50 40 30 20 ROS = 10Ω 40 35 30 ROS = 20Ω 25 20 15 10 10 0 –10 0.001 500 1800 G27 Power Supply Rejection Ratio vs Frequency VS = 5V, 0V 1 1800 G26 1800 G25 120 0.1 300 OVERSHOOT (%) –12 0.1 ROS = RL = 50Ω 5 0 0.01 0.1 1 FREQUENCY (MHz) 10 100 1800 G29 10 100 1000 CAPACITIVE LOAD (pF) 10000 1800 G30 1800fa 10 LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Series Output Resistor vs Capacitive Load Distortion vs Frequency –40 VS = 5V, 0V AV = 2 55 50 –50 DISTORTION (dBc) OVERSHOOT (%) 45 40 35 30 ROS = 10Ω 25 20 ROS = 20Ω 15 10 VS = 5V, 0V AV = 1 VOUT = 2VP-P –60 ROS = RL = 50Ω 0 100 1000 CAPACITIVE LOAD (pF) 10 10000 –50 RL = 1507, 2ND –70 RL = 1k, 2ND RL = 150Ω, 3RD –80 –90 –100 5 Distortion vs Frequency –40 0.1 1 FREQUENCY (MHz) 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) 60 RL = 1k, 3RD 10 –110 0.01 0.1 1 FREQUENCY (MHz) 10 1800 G33 1800 G32 1800 G31 Maximum Undistorted Output Signal vs Frequency 5V Large-Signal Response 5V Small-Signal Response OUTPUT VOLTAGE SWING (VP-P) 4.6 4.5 50mV/DIV 4.4 AV = 2 0V 1V/DIV 4.3 AV = –1 4.2 0V 4.1 4.0 VS = 5V, 0V RL = 1k 3.9 1k 10k 100k 1M FREQUENCY (Hz) VS = 5V, 0V AV = 1 RL = 1k 10M 100ns/DIV 1800 G35 VS = 5V, 0V AV = 1 RL = 1k 1800 G36 50ns/DIV 1800 G34 ±5V Large-Signal Response ±5V Small-Signal Response 2V/DIV 50mV/DIV 0V 0V Output Overdriven Recovery VIN 1V/DIV 0V VOUT 2V/DIV 0V VS = ±5V AV = 1 RL = 1k 200ns/DIV 1800 G37 VS = ±5V AV = 1 RL = 1k 50ns/DIV 1800 G38 VS = 5V, 0V AV = 2 RL = 1k 100ns/DIV 1800 G39 1800fa 11 LT1800 APPLICATIONS INFORMATION Circuit Description 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. 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 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 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. 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 V+ R3 V+ + R5 V– ESDD1 I2 R4 + D1 ESDD2 Q12 Q11 I1 Q13 +IN D6 D8 D5 D7 –IN D2 Q5 ESDD4 I3 CC D3 BUFFER AND OUTPUT BIAS Q10 V+ D4 Q9 Q16 Q17 Q18 OUT V– Q1 Q2 ESDD3 V– + VBIAS Q4 Q3 Q15 C2 Q8 C1 Q19 Q7 Q14 Q6 R1 V– R2 1800 F01 Figure 1. LT1800 Simplified Schematic Diagram 1800fa 12 LT1800 APPLICATIONS INFORMATION 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 shortcircuit 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 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 Figure 1. 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. 1800fa 13 LT1800 APPLICATIONS INFORMATION 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. TYPICAL APPLICATIONS Single Supply 1A Laser Driver 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 IL 0A TO 1A 52.3Ω 52.3Ω Fast 1A Current Sense Amplifier 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. 3V + – 0.1Ω 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. VOUT 0V TO 2V LT1800 500mV/DIV 1k 0V 1800 F02 VOUT = 2 • IL f–3dB = 4MHz UNCERTAINTY DUE TO VOS, IB < 4mA Figure 2. Fast 1A Current Sense VS = 3V 50ns/DIV 1800 F03 Figure 3. Current Sense Amplifier Large-Signal Response 1800fa 14 LT1800 TYPICAL APPLICATIONS Single 3V Supply, 1MHz, 4th Order Butterworth Filter 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 47pF 909Ω 909Ω 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. 2.67k – VIN 1.1k 1.1k 220pF + 22pF 2.21k 3V – 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 1800fa 15 LT1800 PACKAGE DESCRIPTION S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635) 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 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 1.90 BSC S5 TSOT-23 0302 REV B 1800fa 16 LT1800 PACKAGE DESCRIPTION S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .050 BSC .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 8 .245 MIN .160 ±.005 5 .150 – .157 (3.810 – 3.988) NOTE 3 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) 2 3 4 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN 6 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP .008 – .010 (0.203 – 0.254) 7 .014 – .019 (0.355 – 0.483) TYP INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) .050 (1.270) BSC SO8 0303 1800fa 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. 17 LT1800 TYPICAL APPLICATION 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 precise 130V 5V 4.99k 10k 1k Q5 Q6 0.1MF 5V Q2 Q1 + R2 2k 5V R4 2k R6 2k R5 2k R7 2k 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. VOUT LT1800 – Q3 MATERIAL UNDER ELECTRIC FIELD 100pF Q4 VIN 2V/DIV VIN R1 2k C2 8pF 150V C1 39pF AV = VOUT/VIN = –100 ±130V SUPPLY IQ = 130MA OUTPUT SWING = ±128.8V OUTPUT OFFSET 20mV OUTPUT SHORT-CIRCUIT CURRENT 3mA 10% TO 90% RISE TIME 8Ms, 200V OUTPUT STEP SMALL-SIGNAL BANDWIDTH 150kHz Q1, Q2, Q7, Q8: ON SEMI MPSA42 Q3, Q4, Q5, Q6: ON SEMI MPSA92 10k R3 200k Q7 Q8 4.99k 1k –130V 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 DESCRIPTION COMMENTS LT1399 Triple 300MHz Current Feedback Amplifier 0.1dB Gain Flatness to 150MHz, Shutdown LT1498/LT1499 Dual/Quad 10MHz, 6Vμs Rail-to-Rail Input and Output C-Load™ Op Amps High DC Accuracy, 475μV VOS(MAX), 4mV/°C Max Drift, Max Supply Current 2.2mA per Amp LT1630/LT1631 Dual/Quad 30MHz, 10V/μs Rail-to-Rail Input and Output Op Amps High DC Accuracy, 525μV VOS(MAX), 70mA Output Current, Max Supply Current 4.4mA per Amplifier LT1801/LT1802 80MHz, 25V/μs Low Power Rail-to-Rail Input/Output Precision Op Amps Dual/Quad Version of the LT1800 LT1806/LT1807 Single/Dual 325MHz, 140V/μs Rail-to-Rail Input and Output Op Amps High DC Accuracy, 550μV VOS(MAX), Low Noise 3.5nV/√Hz, Low Distortion –80dB at 5MHz, Power-Down (LT1806) LT1809/LT1810 Single/Dual 180MHz Rail-to-Rail Input/Output Op Amps 350V/μs Slew Rate, Low Distortion –t at 5MHz, Power-Down (LT1809) C-Load is a trademark of Linear Technology Corporation. 1800fa 18 Linear Technology Corporation LT 0709 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2009