LT1800CS5

LT1800 LINER

Document overview

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Technical content

80MHz, 25V/ms Low Power Rail-to-Rail Input and Output Precision Op Amp The LT 1800 is a low power, high speed rail-to-rail input and output operational amplifier with excellent DC perfor- mance. 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 sup- ply 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. n Gain Bandwidth Product: 80MHz n Input Common Mode Range Includes Both Rails n Output Swings Rail-to-Rail n Low Quiescent Current: 2mA Max n Input Offset Voltage: 350mV Max n Input Bias Current: 250nA Max n Low Voltage Noise: 8.5nV/ÖHz n Slew Rate: 25V/ms n Common Mode Rejection: 105dB n Power Supply Rejection: 97dB n Open-Loop Gain: 85V/mV n Available in the 8-Pin SO and 5-Pin Low Profile (1mm) ThinSOT TM Packages n Operating Temperature Range: – 40°C to 85°C , LTC and LT are registered trademarks of Linear Technology Corporation. n Low Voltage, High Frequency Signal Processing n Driving A/D Converters n Rail-to-Rail Buffer Amplifiers n Active Filters n Video Line Driver LT1800 VIN DO NOT FLOAT IR LASER INFINEON SFH495 ZETEX FMMT619 330W R1 W

1800 TA01

Single Supply 1A Laser Driver Amplifier Laser Driver Amplifier 500mA Pulse Response 100mA/DIV 50ns/DIV 1800 TA02 ThinSOT is a trademark of Linear Technology Corporation.

1800ITJMAX = 150°C, qJA = 190°C/ W Operating Temperature Range (Note 4) .. – 40°C to 85°C ABSOLUTE AXI U RATI GSW WW U PACKAGE/ORDER I FOR ATIOUU W Consult LTC Marketing for parts specified with wider operating temperature ranges. Specified Temperature Range (Note 5) ... – 40°C to 85°C (Note 1) TOP VIEW NC VS+ VOUT NC NC –IN +IN V S8 PACKAGE 8-LEAD PLASTIC SO ORDER PART NUMBER S5 PART MARKING LT1800CS5 LT1800IS5 LTRN LTRP VOUT 1 VS– 2 TOP VIEW S5 PACKAGE 5-LEAD PLASTIC SOT-23 +IN 3

5 VS+

4 –IN + – TJMAX = 150°C, qJA = 250°C/ W TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VOS Input Offset Voltage V CM = 0V 75 350 mV VCM = 0V (SOT-23) 300 750 mV VCM = VS 0.5 3 mV VCM = VS (SOT-23) 0.7 3.5 mV DVOS Input Offset Shift V CM = 0V to VS – 1.5V 20 180 mV IB Input Bias Current V CM = 1V 25 250 nA VCM = VS 500 1500 nA IOS Input Offset Current V CM = 1V 25 200 nA VCM = VS 25 200 nA Input Noise Voltage 0.1Hz to 10Hz 1.4 mVP-P en Input Noise Voltage Density f = 10kHz 8.5 nV/ ÖHz in Input Noise Current Density f = 10kHz 1 pA/ ÖHz CIN Input Capacitance f = 100kHz 2 pF AVOL Large-Signal Voltage Gain V S = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2 35 85 V/mV VS = 5V, VO = 1V to 4V, RL = 100W at VS/2 3.5 8 V/mV VS = 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2 30 85 V/mV CMRR Common Mode Rejection Ratio V S = 5V, VCM = 0V to 3.5V 85 105 dB VS = 3V, VCM = 0V to 1.5V 78 97 dB Input Common Mode Range 0 V S V PSRR Power Supply Rejection Ratio V S = 2.5V to 10V, VCM = 0V 80 97 dB Minimum Supply Voltage (Note 6) 2.3 2.5 V

TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VOL Output Voltage Swing Low (Note 7) No Load 12 50 mV ISINK = 5mA 80 160 mV ISINK = 20mA 225 450 mV VOH Output Voltage Swing High (Note 7) No Load 16 60 mV ISOURCE = 5mA 120 250 mV ISOURCE = 20mA 450 750 mV ISC Short-Circuit Current V S = 5V 20 45 mA VS = 3V 20 40 mA IS Supply Current per Amplifier 1.6 2 mA GBW Gain Bandwidth Product Frequency = 2MHz 40 80 MHz SR Slew Rate V S = 5V, AV = –1, R L = 1k, VO = 4V 13 25 V/ ms FPBW Full Power Bandwidth V S = 5V, VOUT = 4VP-P 2 MHz HD Harmonic Distortion V S = 5V, AV = 1, RL = 1k, VO = 2VP-P, fC = 500kHz –75 dBc tS Settling Time 0.01%, V S = 5V, VSTEP = 2V, AV = 1, RL = 1k 250 ns DG Differential Gain (NTSC) V S = 5V, AV = +2, RL = 150W 0.35 % Dq Differential Phase (NTSC) V S = 5V, AV = +2, RL = 150W 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 MIN TYP MAX UNITS VOS Input Offset Voltage V CM = 0V l 125 500 mV VCM = 0V (SOT-23) l 300 1250 mV VCM = VS l 0.6 3.5 mV VCM = VS (SOT-23) l 0.7 3.75 mV DVOS Input Offset Shift V CM = 0V to VS – 1.5V l 30 275 mV VOS TC Input Offset Voltage Drift (Note 8) l 1.5 5 mV/°C IB Input Bias Current V CM = 1V l 50 300 nA VCM = VS – 0.2V l 550 1750 nA IOS Input Offset Current V CM = 1V l 25 250 nA VCM = VS – 0.2V l 25 250 nA AVOL Large-Signal Voltage Gain V S = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2 l 30 75 V/mV VS = 5V, VO = 1V to 4V, RL = 100W at VS/2 l 3 6 V/mV VS = 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2 l 25 75 V/mV CMRR Common Mode Rejection Ratio V S = 5V, VCM = 0V to 3.5V l 82 101 dB VS = 3V, VCM = 0V to 1.5V l 74 93 dB Input Common Mode Range l 0V S V PSRR Power Supply Rejection Ratio V S = 2.5V to 10V, VCM = 0V l 74 91 dB Minimum Supply Voltage (Note 6) l 2.3 2.5 V VOL Output Voltage Swing Low (Note 7) No Load l 14 60 mV ISINK = 5mA l 100 200 mV ISINK = 20mA l 300 550 mV VOH Output Voltage Swing High (Note 7) No Load l 25 80 mV ISOURCE = 5mA l 150 300 mV ISOURCE = 20mA l 600 950 mV ISC Short-Circuit Current V S = 5V l 20 40 mA VS = 3V l 20 30 mA IS Supply Current per Amplifier l 2 2.75 mA GBW Gain Bandwidth Product Frequency = 2MHz l 35 75 MHz SR Slew Rate V S = 5V, AV = –1, R L = 1k, VO = 4VP-P l 11 22 V/ ms

ELECTRICAL CHARACTERISTICSThe 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. (Note 5) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VOS Input Offset Voltage V CM = 0V l 175 700 mV VCM = 0V (SOT-23) l 400 2000 mV VCM = VS l 0.75 4 mV VCM = VS (SOT-23) l 0.9 4 mV DVOS Input Offset Shift V CM = 0V to VS – 1.5V l 30 300 mV VOS TC Input Offset Voltage Drift (Note 8) l 1.5 5 mV/°C IB Input Bias Current V CM = 1V l 50 400 nA VCM = VS – 0.2V l 600 2000 nA IOS Input Offset Current V CM = 1V l 25 300 nA VCM = VS – 0.2V l 25 300 nA AVOL Large-Signal Voltage Gain V S = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2 l 25 65 V/mV VS = 5V, VO = 1.5V to 3.5V, RL = 100W at VS/2 l 2.5 6 V/mV VS = 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2 l 20 65 V/mV CMRR Common Mode Rejection Ratio V S = 5V, VCM = 0V to 3.5V l 81 101 dB VS = 3V, VCM = 0V to 1.5V l 73 93 dB Input Common Mode Range l 0V S V PSRR Power Supply Rejection Ratio V S = 2.5V to 10V, VCM = 0V l 73 90 dB Minimum Supply Voltage (Note 6) l 2.3 2.5 V VOL Output Voltage Swing Low (Note 7) No Load l 15 70 mV ISINK = 5mA l 105 210 mV ISINK = 10mA l 170 400 mV VOH Output Voltage Swing High (Note 7) No Load l 25 90 mV ISOURCE = 5mA l 150 350 mV ISOURCE = 10mA l 300 700 mV ISC Short-Circuit Current V S = 5V l 12.5 30 mA VS = 3V l 12.5 30 mA IS Supply Current per Amplifier l 2.1 3 mA GBW Gain Bandwidth Product Frequency = 2MHz l 30 70 MHz SR Slew Rate V S = 5V, AV = –1, R L = 1k, VO = 4V l 10 18 V/ ms TA = 25°C, VS = –5V, VCM = 0V, VOUT = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VOS Input Offset Voltage V CM = VS– 150 500 mV VCM = VS– (SOT-23) 400 1000 mV VCM = VS+ 0.7 3.5 mV VCM = VS+ (SOT-23) 1 4.5 mV DVOS Input Offset Shift V CM = VS– to VS+ – 1.5V 30 475 mV IB Input Bias Current V CM = VS– + 1V 25 350 nA VCM = VS+ 400 1500 nA IOS Input Offset Current V CM = VS– + 1V 20 250 nA VCM = VS+ 20 250 nA Input Noise Voltage 0.1Hz to 10Hz 1.4 mVP-P en Input Noise Voltage Density f = 10kHz 8.5 nV/ ÖHz in Input Noise Current Density f = 10kHz 1 pA/ ÖHz CIN Input Capacitance f = 100kHz 2 pF

TA = 25°C, VS = –5V, VCM = 0V, VOUT = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS AVOL Large-Signal Voltage Gain V O = –4V to 4V, RL = 1k 25 70 V/mV VO = –2V to 2V, RL = 100W 2.5 7 V/mV CMRR Common Mode Rejection Ratio V CM = VS– to 3.5V 85 109 dB Input Common Mode Range V S– VS+ V PSRR Power Supply Rejection Ratio V S+ = 2.5V to 10V, VS– = 0V 80 97 dB VOL Output Voltage Swing Low (Note 7) No Load 15 60 mV ISINK = 5mA 85 170 mV ISINK = 20mA 225 450 mV VOH Output Voltage Swing High (Note 7) No Load 17 70 mV ISOURCE = 5mA 130 260 mV ISOURCE = 20mA 450 750 mV ISC Short-Circuit Current 30 50 mA IS Supply Current per Amplifier 1.8 2.75 mA GBW Gain Bandwidth Product Frequency = 2MHz 70 MHz SR Slew Rate A V = – 1, RL = 1k, VO = – 4V, Measured at VO = –2V 23 V/ ms FPBW Full Power Bandwidth V O = 8VP-P 0.9 MHz HD Harmonic Distortion A V = 1, RL = 1k, VO = 2VP-P, fC = 500kHz –75 dBc tS Settling Time 0.01%, V STEP = 5V, AV = 1V, RL = 1k 300 ns DG Differential Gain (NTSC) A V = + 2, RL = 150W 0.35 % Dq Differential Phase (NTSC) A V = + 2, RL = 150W 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 MIN TYP MAX UNITS VOS Input Offset Voltage V CM = VS– l 200 800 mV VCM = VS– (SOT-23) l 450 1500 mV VCM = VS+ l 0.75 4 mV VCM = VS+ (SOT-23) l 15 m V DVOS Input Offset Shift V CM = VS– to VS+ – 1.5V l 45 675 mV VOS TC Input Offset Voltage Drift (Note 8) l 1.5 5 mV/°C IB Input Bias Current V CM = VS– + 1V l 30 400 nA VCM = VS+ – 0.2V l 450 1750 nA IOS Input Offset Current V CM = VS– + 1V l 25 300 nA VCM = VS+ – 0.2V l 25 300 nA AVOL Large-Signal Voltage Gain V O = –4V to 4V, RL = 1k l 20 55 V/mV VO = –2V to 2V, RL = 100W l 2 5 V/mV CMRR Common Mode Rejection Ratio V CM = VS– to 3.5V l 82 105 dB Input Common Mode Range l VS– VS+ V PSRR Power Supply Rejection Ratio V S+ = 2.5V to 10V, VS– = 0V l 74 91 dB VOL Output Voltage Swing Low (Note 7) No Load l 17 70 mV ISINK = 5mA l 105 210 mV ISINK = 20mA l 250 575 mV VOH Output Voltage Swing High (Note 7) No Load l 25 90 mV ISOURCE = 5mA l 150 310 mV ISOURCE = 20mA l 600 975 mV

ELECTRICAL CHARACTERISTICSThe 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 MIN TYP MAX UNITS ISC Short-Circuit Current l 25 45 mA IS Supply Current per Amplifier l 2.4 3.5 mA GBW Gain Bandwidth Product Frequency = 2MHz l 70 MHz SR Slew Rate A V = –1, R L = 1k, VO = –4V, Measured at VO = –2V l 20 V/ ms 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 MIN TYP MAX UNITS VOS Input Offset Voltage V CM = VS– l 350 900 mV VCM = VS– (SOT-23) l 500 2250 mV VCM = VS+ l 0.75 4.5 mV VCM = VS+ (SOT-23) l 1 5.5 mV DVOS Input Offset Shift V CM = VS– to VS+ – 1.5V l 50 750 mV VOS TC Input Offset Voltage Drift (Note 8) l 1.5 5 mV/°C IB Input Bias Current V CM = VS– + 1V l 50 450 nA VCM = VS+ – 0.2V l 450 2000 nA IOS Input Offset Current V CM = VS– + 1V l 25 350 nA VCM = VS+ – 0.2V l 25 350 nA AVOL Large-Signal Voltage Gain V O = –4V to 4V, RL = 1k l 16 55 V/mV VO = –1V to 1V, RL = 100W l 2 5 V/mV CMRR Common Mode Rejection Ratio V CM = VS– to 3.5V l 81 104 dB Input Common Mode Range l VS– VS+ V PSRR Power Supply Rejection Ratio V S+ = 2.5V to 10V, VS– = 0V l 73 90 dB VOL Output Voltage Swing Low (Note 7) No Load l 15 80 mV ISINK = 5mA l 105 220 mV ISINK = 10mA l 170 400 mV VOH Output Voltage Swing High (Note 7) No Load l 25 100 mV ISOURCE = 5mA l 150 350 mV ISOURCE = 10mA l 300 700 mV ISC Short-Circuit Current l 12.5 30 mA IS Supply Current per Amplifier l 2.6 4 mA GBW Gain Bandwidth Product Frequency = 2MHz l 65 MHz SR Slew Rate A V = –1, R L = 1k, VO = –4V, Measured at VO = –2V l 15 V/ ms 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.

TYPICAL PERFOR A CE CHARACTERISTICS UW Supply Current vs Supply Voltage TOTAL SUPPLY VOLTAGE (V) SUPPLY CURRENT (mA)

1800 G03

TA = 125°C TA = 25°C TA = –55°C Offset Voltage vs Input Common Mode Voltage INPUT COMMON MODE VOLTAGE (V) OFFSET VOLTAGE (µV) 100 300 500

1800 G04

–100 –300 200 400 –200 –400 –500 1 2 3 5 VS = 5V, 0V TYPICAL PARTTA = –55°C TA = 125°C TA = 25°C INPUT COMMON MODE VOLTAGE (V) INPUT BIAS CURRENT (µA) 0.2 0.6 1.0

1800 G05

–0.2 –0.6 0.4 0.8 –0.4 –0.8 –1.0 0 1 23 5 VS = 5V, 0V TA = 25°C TA = 125°C TA = –55°C TEMPERATURE (°C) –60 –0.1 INPUT BIAS (µA) 0.2 0.3 0.4 40 60 80 0.8

1800 G06

0.1 –40 –20 0 20 0.5 0.6 0.7 NPN ACTIVE VS = 5V, 0V VCM = 5V PNP ACTIVE VS = 5V, 0V VCM = 1V Input Bias Current vs Common Mode Voltage Input Bias Current vs Temperature Output Saturation Voltage vs Load Current (Output Low) LOAD CURRENT (mA) 0.01 0.1

0.001 OUTPUT SATURATION VOLTAGE (V)

0.1 1 10 100

1800 G07

0.01 VS = 5V, 0V TA = 125°C TA = –55°C TA = 25°C INPUT OFFSET VOLTAGE (µV) –250 PERCENT OF UNITS (%) 50 150

1800 G01

–150 –50 250 VS = 5V, 0V VCM = 0V VOS Distribution, VCM = 0V (SO-8, PNP Stage) INPUT OFFSET VOLTAGE (µV) –2000 PERCENT OF UNITS (%) 400 1200

1800 G02

–1200 –400 2000 VS = 5V, 0V VCM = 5V VOS Distribution, VCM = 5V (SO-8, NPN Stage) INPUT OFFSET VOLTAGE (µV) –1250 PERCENT OF UNITS (%) 750

1800 G38

–750 –250 250 1250 VS = 5V, 0V VCM = 0V VOS Distribution, VCM = 0V (SOT-23, PNP Stage) VOS Distribution, VCM = 5V (SOT-23, NPN Stage) INPUT OFFSET VOLTAGE (µV) –2500 PERCENT OF UNITS (%)

1800 G39

–500 2500–1500 500 1500 VS = 5V, 0V VCM = 5V

TYPICAL PERFOR A CE CHARACTERISTICS UW Open-Loop Gain Open-Loop Gain Offset Voltage vs Output Current Warm-Up Drift vs Time (LT1800S8) Open-Loop Gain Output Short-Circuit Current vs Power Supply Voltage POWER SUPPLY VOLTAGE (–V) 1.5 –70OUTPUT SHORT-CIRCUIT CURRENT (mA) –50 –30 –10 2 3 3.5 5 –60 –40 –20 2.5 4 4.5TA = 125°C TA = 125°C TA = –55°C SINKING VS = 5V, 0V SOURCINGTA = –55°C TA = 25°C TA = 25°C

1800 G10

OUTPUT VOLTAGE (V) –2000 CHANGE IN OFFSET VOLTAGE (µV) –1200 –400 400 0.5 1 1.5 2

1800 G11

2.5 1200 2000 –1600 –800 800 1600 VS = 3V, 0V RL TO GND RL = 1k RL = 100Ω OUTPUT VOLTAGE (V) CHANGE IN OFFSET VOLTAGE (µV) 400 1200 2000

1800 G12

–400 –1200 800 1600 –800 –1600 –2000 VS = 5V, 0V RL TO GND RL = 1k RL = 100Ω OUTPUT VOLTAGE (V) CHANGE IN OFFSET VOLTAGE (µV) 400 1200 2000

1800 G13

–400 –1200 800 1600 –800 –1600 –2000 –3–4 –1–2 12 40 5 VS = –5V RL TO GND RL = 1k RL = 100Ω OUTPUT CURRENT (mA) –60 CHANGE IN OFFSET VOLTAGE (mV) 1.0

1800 G14

–1.0 –2.0 –30 0 30–45 –15 15 45 2.0 –0.5 0.5 –1.5 1.5 VS = –5V TA = 125°C TA = –55°C TA = 25°C TIME AFTER POWER-UP (SECONDS) OFFSET VOLTAGE (µV) 110

1800 G15

VS = –5V VS = –2.5V VS = –1.5V TYPICAL PART Input Noise Voltage vs Frequency FREQUENCY (kHz) NOISE VOLTAGE (nV/√Hz) 0.01 1 10 100

1800 G16

0.1 VS = 5V, 0V NPN ACTIVE VCM = 4.25V PNP ACTIVE VCM = 2.5V Output Saturation Voltage vs Load Current (Output High) LOAD CURRENT (mA) 0.01 0.1 0.1 1 10 100

1800 G08

0.01 VS = 5V, 0V TA = 125°C TA = –55°C TA = 25°C Minimum Supply Voltage TOTAL SUPPLY VOLTAGE (V) –0.6 CHANGE IN OFFSET VOLTAGE (mV)–0.4 0.2 0.4 2 3 3.5 5.5

1800 G09

–0.2 1.5 2.5 4 4.5 5 0.6 TA = 125°C TA = –55°C TA = 25°C

TYPICAL PERFOR A CE CHARACTERISTICS UW Gain Bandwidth and Phase Margin vs Supply Voltage TOTAL SUPPLY VOLTAGE (V) GAIN BANDWIDTH (MHz) PHASE MARGIN (DEG) 100 60 60

1800 G19

TA = 25°C TEMPERATURE (°C) –55 GAIN BANDWIDTH (MHz) PHASE MARGIN (DEG) 100 –15 25 45 125

1800 G20

–35 5 65 85 105 GBW PRODUCT VS = –2.5V PHASE MARGIN VS = –2.5V PHASE MARGIN VS = –5V GBW PRODUCT VS = –5V TEMPERATURE (°C) –55 SLEW RATE (V/µs) –15 25 45 125

1800 G21

–35 5 65 85 105 AV = –1 RF = RG = 1k RL = 1k VS = –2.5V VS = –5V Gain Bandwidth and Phase Margin vs Temperature Slew Rate vs Temperature Gain and Phase vs Frequency FREQUENCY (MHz) 0.01 10OPEN-LOOP GAIN (dB) PHASE (DEG) 0.1 1 10 100 300

1800 G22

0– 4 0 –10 –20 –30 –20 –60 –80 –100 100 VS = –2.5V VS = –5V PHASE GAIN Gain vs Frequency (AV = 1) FREQUENCY (MHz) GAIN (dB) 0.1 10 100 300

1800 G23

–12 RL = 1k CL = 10pF AV = 1 VS = –5V VS = –2.5V FREQUENCY (MHz) GAIN (dB) 0.1 10 100 300

1800 G24

RL = 1k CL = 10pF AV = 2 VS = –5V VS = –2.5V Gain vs Frequency (AV = 2) Output Impedance vs Frequency FREQUENCY (MHz) 0.1

0.001 OUTPUT IMPEDANCE (Ω )

0.1 600 100 1 10 100 500

1800 G25

0.01 VS = –2.5V AV = 10 AV = 1 AV = 2 0.1Hz to 10Hz Output Voltage Noise TIME (SECONDS) OUTPUT NOISE VOLTAGE (nV) 2000 1000 –1000 –2000

1800 G18

VS = 5V, 0V Input Current Noise vs Frequency FREQUENCY (kHz) 1.0 NOISE CURRENT (pA/√Hz) 2.0 3.0 0.5 1.5 2.5 0.01 1 10 100

1800 G17

0.1 VS = 5V, 0V NPN ACTIVE VCM = 4.25V PNP ACTIVE V CM = 2.5V

TYPICAL PERFOR A CE CHARACTERISTICS UW Series Output Resistor vs Capacitive Load CAPACITIVE LOAD (pF) OVERSHOOT (%) 100 1000 10000

1800 G28

VS = 5V, 0V AV = 1 ROS = 10Ω ROS = 20Ω ROS = RL = 50Ω Series Output Resistor vs Capacitive Load CAPACITIVE LOAD (pF) OVERSHOOT (%) 100 1000 10000

1800 G29

VS = 5V, 0V AV = 2 ROS = 10Ω ROS = RL = 50Ω ROS = 20Ω FREQUENCY (MHz) 0.01 –70DISTORTION (dBc) –60 –50 –40 0.1 1 10

1800 G30

–80 –90 –100 –110 VS = 5V, 0V AV = 1 VOUT = 2VP-P RL = 150Ω , 2ND RL = 150Ω , 3RD RL = 1k, 2ND RL = 1k, 3RD Distortion vs Frequency Distortion vs Frequency FREQUENCY (MHz) 0.01 –70DISTORTION (dBc) –60 –50 –40 0.1 1 10

1800 G31

–80 –90 –100 –110 VS = 5V, 0V AV = 2 VOUT = 2VP-P RL = 150Ω , 2ND RL = 150Ω , 3RD RL = 1k, 2ND RL = 1k, 3RD 5V Large-Signal Response 1V/DIV VS = 5V, 0V 100ns/DIV 1800 G33 AV = 1 RL = 1k 5V Small-Signal Response 50mV/DIV VS = 5V, 0V 50ns/DIV 1800 G34 AV = 1 RL = 1k Common Mode Rejection Ratio vs Frequency FREQUENCY (MHz) COMMON MODE REJECTION RATIO (dB) 120 100 0.01 1 10 100

1800 G26

0.1 VS = 5V, 0V Power Supply Rejection Ratio vs Frequency FREQUENCY (MHz) 0.001 POWER SUPPLY REJECTION RATIO (dB) 0.01 0.1 1 10 100

1800 G27

–10

90 VS = 5V, 0V

TA = 25°C POSITIVE SUPPLY NEGATIVE SUPPLY Maximum Undistorted Output Signal vs Frequency FREQUENCY (Hz) 4.1 OUTPUT VOLTAGE SWING (VP-P) 4.3 4.5 4.6 1k 100k 1M 10M

1800 G32

3.9 10k 4.4 4.2 4.0 VS = 5V, 0V RL = 1k AV = –1 AV = 2

1800 F01

Figure 1. LT1800 Simplified Schematic Diagram Q19 act to cancel the bias current of the PNP input pair.

APPLICATIO S I FOR ATIOWU UU 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 bi- polar process. Power Dissipation The LT1800 amplifier is offered in a small package, SOT-23, which has a thermal resistance of 250°C/W, q JA. So there is a need to ensure that the die’s junction temperature should not exceed 150 °C. Junction temperature T J is calculated from the ambient temperature TA, power dissi- pation PD and thermal resistance qJA: TJ = TA + (PD • qJA) 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 50 W load, the worst-case power dissipation is given by: The maximum ambient temperature that the part is al- lowed to operate is: TA = TJ – (PDMAX • 250°C/W) 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 75mV 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 imped- ance 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 maxi- mum 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

connected to the power supplies as shown in Figure1. a specified series resistor. tor will eliminate any ringing or oscillation. response of the circuit is shown in Figure 3.

1800 F02

Figure 2. Fast 1A Current Sense

1800 F04

Figure 4. 3V, 1MHz, 4th Order Butterworth Filter Figure 5. Frequency Response of Filter

1800 F05

Figure 3. Current Sense Amplifier Large-Signal Response

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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. UPACKAGE DESCRIPTIO 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 0.016 – 0.050 (0.406 – 1.270) 0.010 – 0.020 0°– 8° TYP 0.008 – 0.010 (0.203 – 0.254) SO8 1298 0.053 – 0.069 (1.346 – 1.752) 0.014 – 0.019 (0.355 – 0.483) TYP 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC 1 2 3 4 0.150 – 0.157** (3.810 – 3.988) 8 7 6 5 0.189 – 0.197* (4.801 – 5.004) 0.228 – 0.244 (5.791 – 6.197) 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-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 1.50 – 1.75 (NOTE 4)2.80 BSC 0.30 – 0.45 TYP

5 PLCS (NOTE 3)

DATUM ‘A’ 0.09 – 0.20 (NOTE 3) S5 TSOT-23 0302 PIN ONE

2.90 BSC

(NOTE 4)

0.95 BSC

1.90 BSC

0.80 – 0.90

1.00 MAX

0.01 – 0.100.20 BSC 0.30 – 0.50 REF 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

3.85 MAX

0.62 MAX 0.95 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 1.4 MIN2.62 REF

1.22 REF

C-Load is a trademark of Linear Technology Corporation.

1800 F06

Figure 6. Low Power, High Voltage Amplifier allowing for dense layout, and inherits better reliability. providing a 200V output swing into a 100pF load. Figure 7. Large-Signal Time Domain