LT1801/LT1802 Dual/Quad 80MHz, 25V/µs Power Rail-to-Rail Input Output

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LT1801/LT1802 Dual/Quad 80MHz, 25V/µs Power Rail-to-Rail Input Output

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LT1801/LT1802 Dual/Quad 80MHz, 25V/µs Power Rail-to-Rail Input Output Precision Amps DESCRIPTIO
®1801/LT1802 dual/quad, power, high speed rail-to-rail input output operational amplifiers with excellent performance. LT1801/LT1802 feature reduced supply current, lower input offset voltage, lower input bias current higher gain than other devices with comparable bandwidth. Typically, LT1801/LT1802 have input offset voltage less than 100µV, input bias current less than 50nA open-loop gain thousand. LT1801/LT1802 have input range that includes both supply rails output that swings within 20mV either supply rail maximize signal dynamic range supply applications. LT1801/LT1802 maintain their performance supplies from 2.3V 12.6V specified supplies. inputs driven beyond supplies without damage phase reversal output. LT1801 available SO-8 package with standard dual pinout. LT1802 features standard quad configuration available 14-pin plastic package. LT1801/LT1802 used plug-in replacements many amps improve input/output range performance. single version these amplifiers, LT1800 data sheet.
Gain Bandwidth Product: 80MHz Input Common Mode Range Includes Both Rails Output Swings Rail-to-Rail Voltage Operation: Single Split Supplies 2.3V 12.6V Quiescent Current: 2mA/Amplifier Input Offset Voltage: 350µV Input Bias Current: 250nA Large Output Current: 50mA Voltage Noise: 8.5nV/Hz Slew Rate: 25V/µs Common Mode Rejection: 105dB Power Supply Rejection: 97dB Open-Loop Gain: 85V/mV Dual Available SO-8 Package Quad Available 14-Pin Narrow Package Operating Temperature Range: 40°C 85°C
APPLICATIO
Voltage, High Frequency Signal Processing Driving Converters Rail-to-Rail Buffer Amplifiers Active Filters Video Line Driver
registered trademarks Linear Technology Corporation.
TYPICAL APPLICATIO
1MHz, Order Butterworth Filter
220pF 2.67k 47pF 1.1k 22pF
GAIN (dB)
LT1801 470pF
18012 TA01
1.1k
2.21k
LT1801
VOUT
1MHz Filter Frequency Response
-100 -120 100k FREQUENCY (Hz) 100M
18012 TA02
18012f
LT1801/LT1802
ABSOLUTE
RATI
Total Supply Voltage (VS- VS+) 12.6V Input Current (Note ±10mA Output Short-Circuit Duration (Note Indefinite Operating Temperature Range (Note 40°C 85°C
PACKAGE/ORDER ATIO
VIEW
ORDER PART NUMBER
LT1801CS8 LT1801IS8 PART MARKING 1801 1801I
PACKAGE 8-LEAD PLASTIC
TJMAX 150°C, 190°C/
Consult Marketing parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
25°C, VOUT half supply, unless otherwise noted.
SYMBOL PARAMETER Input Offset Voltage Input Offset Shift Input Offset Voltage Match (Channel-to-Channel) (Note Input Bias Current Input Bias Current Match (Channel-to-Channel) (Note Input Offset Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Capacitance CONDITIONS 1.5V 0.1Hz 10Hz 10kHz 10kHz 1500 UNITS µVP-P nV/Hz pA/Hz
(Note
Specified Temperature Range (Note 40°C 85°C Junction Temperature 150°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
VIEW
ORDER PART NUMBER LT1802CS LT1802IS
PACKAGE 14-LEAD PLASTIC TJMAX 150°C, 160°C/
18012f
LT1801/LT1802
ELECTRICAL CHARACTERISTICS
25°C, VOUT half supply, unless otherwise noted.
SYMBOL PARAMETER AVOL Large-Signal Voltage Gain CONDITIONS 0.5V 4.5V, VS/2 VS/2 0.5V 2.5V, VS/2 Common Mode Rejection Ratio 3.5V 1.5V CMRR Match (Channel-to-Channel) (Note 3.5V 1.5V Input Common Mode Range Power Supply Rejection Ratio 2.5V 10V, PSRR Match (Channel-to-Channel) (Note 2.5V 10V, Minimum Supply Voltage (Note Output Voltage Swing (Note Load ISINK ISINK 20mA Output Voltage Swing High (Note Load ISOURCE ISOURCE 20mA Short-Circuit Current Supply Current Amplifier Gain Bandwidth Product Frequency 2MHz Slew Rate 4VP-P Full Power Bandwidth 4VP-P Harmonic Distortion 2VP-P, 500kHz Settling Time 0.01%, VSTEP Differential Gain (NTSC) Differential Phase (NTSC) 0.35 UNITS V/mV V/mV V/mV V/µs
CMRR
PSRR
FPBW
12.5
denotes specifications which apply over temperature range 70°C. VOUT half supply, unless otherwise noted.
SYMBOL PARAMETER Input Offset Voltage Input Offset Shift Input Offset Voltage Match (Channel-to-Channel) (Note Input Offset Voltage Drift (Note Input Bias Current Input Bias Current Match (Channel-to-Channel) (Note Input Offset Current Large-Signal Voltage Gain CONDITIONS 1.5V
1000 2000
UNITS µV/°C V/mV V/mV V/mV
18012f
AVOL
CMRR
Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note
0.2V 0.2V 0.2V 0.5V 4.5V, VS/2 VS/2 0.5V 2.5V, VS/2 3.5V 1.5V 3.5V 1.5V
LT1801/LT1802
denotes specifications which apply over temperature range 70°C. VOUT half supply, unless otherwise noted.
SYMBOL PARAMETER Input Common Mode Range PSRR Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note Minimum Supply Voltage (Note Output Voltage Swing (Note CONDITIONS
ELECTRICAL CHARACTERISTICS
2.5V 10V, 2.5V 10V, Load ISINK ISINK 20mA Load ISOURCE ISOURCE 20mA Frequency 2MHz 4VP-P
Output Voltage Swing High (Note
Short-Circuit Current Supply Current Amplifier Gain Bandwidth Product Slew Rate
UNITS V/µs
denotes specifications which apply over temperature range 40°C 85°C. VOUT half supply, unless otherwise noted. (Note
SYMBOL PARAMETER Input Offset Voltage Input Offset Shift Input Offset Voltage Match (Channel-to-Channel) (Note Input Offset Voltage Drift (Note Input Bias Current 0.2V Input Bias Current Match (Channel-to-Channel) (Note AVOL Input Offset Current Large-Signal Voltage Gain 0.2V 0.2V 0.5V 4.5V, VS/2 1.5V 3.5V, VS/2 0.5V 2.5V, VS/2 3.5V 1.5V 3.5V 1.5V 2.5V 10V, 2.5V 10V, 0.5V Load ISINK ISINK 10mA Load ISOURCE ISOURCE 10mA CONDITIONS 1.5V
0.75
1400 2250
UNITS µV/°C V/mV V/mV V/mV
17.5
CMRR
Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note Input Common Mode Range
18012f
PSRR
Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note Minimum Supply Voltage (Note
Output Voltage Swing (Note
Output Voltage Swing High (Note
LT1801/LT1802
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Short-Circuit Current Supply Current Amplifier Gain Bandwidth Product Slew Rate Frequency 2MHz
denotes specifications which apply over temperature range 40°C 85°C. VOUT half supply, unless otherwise noted. (Note
CONDITIONS
12.5 12.5
UNITS
V/µs
25°C, ±5V, VOUT unless otherwise noted.
SYMBOL PARAMETER Input Offset Voltage Input Offset Shift Input Offset Voltage Match (Channel-to-Channel) (Note Input Bias Current Input Bias Current Match (Channel-to-Channel) (Note Input Offset Current Input Noise Voltage AVOL CMRR Input Noise Voltage Density Input Noise Current Density Input Capacitance Large-Signal Voltage Gain Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note Input Common Mode Range PSRR Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note Output Voltage Swing (Note 2.5V 10V, 2.5V 10V, CONDITIONS 1.5V
1000 1500
UNITS µVP-P nV/Hz pA/Hz V/mV V/mV
0.1Hz 10Hz 10kHz 10kHz 100kHz 3.5V
3.5V
V/µs
18012f
Load ISINK ISINK 20mA Load ISOURCE ISOURCE 20mA Frequency 2MHz 8VP-P ±4V, Measured 2VP-P, 500kHz 0.01%, VSTEP
Output Voltage Swing High (Note
FPBW
Short-Circuit Current Supply Current Amplifier Gain Bandwidth Product Full Power Bandwidth Slew Rate Harmonic Distortion Settling Time Differential Gain (NTSC) Differential Phase (NTSC)
0.35
LT1801/LT1802
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Input Offset Voltage Input Offset Shift Input Offset Voltage Match (Channel-to-Channel) (Note Input Offset Voltage Drift (Note Input Bias Current Input Bias Current Match (Channel-to-Channel) (Note AVOL CMRR Input Offset Current Large-Signal Voltage Gain Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note Input Common Mode Range PSRR Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note Output Voltage Swing (Note
denotes specifications which apply over temperature range 70°C. ±5V, VOUT unless otherwise noted.
CONDITIONS 1.5V
0.75
1500 2000
UNITS µV/°C V/mV V/mV
0.2V 0.2V 0.2V 3.5V
3.5V
V/µs
2.5V 10V, 2.5V 10V, Load ISINK ISINK 20mA Load ISOURCE ISOURCE 20mA
Output Voltage Swing High (Note
Short-Circuit Current Supply Current Amplifier Gain Bandwidth Product Slew Rate Frequency 2MHz ±4V, Measured
22.5
18012f
LT1801/LT1802
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Input Offset Voltage Input Offset Shift Input Offset Voltage Match (Channel-to-Channel) (Note Input Offset Voltage Drift (Note Input Bias Current Input Bias Current Match (Channel-to-Channel) (Note AVOL CMRR Input Offset Current Large-Signal Voltage Gain Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note Input Common Mode Range PSRR Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note Output Voltage Swing (Note
denotes specifications which apply over temperature range 40°C 85°C. ±5V, VOUT unless otherwise noted. (Note
CONDITIONS 1.5V
0.75
1000 1700 2250
UNITS µV/°C V/mV V/mV
0.2V 0.2V 0.2V 3.5V
3.5V
12.5
V/µs
2.5V 10V, 2.5V 10V, Load ISINK ISINK 10mA Load ISOURCE ISOURCE 10mA
Output Voltage Swing High (Note
Short-Circuit Current Supply Current Amplifier Gain Bandwidth Product Slew Rate Frequency 2MHz ±4V, Measured
12.5
Note Absolute Maximum Ratings those values beyond which life device impaired. Note inputs protected back-to-back diodes. differential input voltage exceeds 1.4V, input current should limited less than 10mA. Note heat sink required keep junction temperature below absolute maximum rating when output shorted indefinitely. Note LT1801C/LT1801I LT1802C/LT1802I guaranteed functional over temperature range 40°C 85°C. Note LT1801C/LT1802C guaranteed meet specified performance from 70°C. LT1801C/LT1802C designed,
characterized expected meet specified performance from -40°C 85°C tested sampled these temperatures. LT1801I/LT1802I guaranteed meet specified performance from -40°C 85°C. Note Minimum supply voltage guaranteed power supply rejection ratio test. Note Output voltage swings measured between output power supply rails. Note This parameter 100% tested. Note Matching parameters difference between amplifiers between LT1802; between amplifiers LT1801.
18012f
LT1801/LT1802 TYPICAL PERFOR CHARACTERISTICS
Distribution, (PNP Stage)
PERCENT UNITS -150 INPUT OFFSET VOLTAGE (µV) -2000 -1200 -400 1200 INPUT OFFSET VOLTAGE (µV) 2000
SUPPLY CURRENT (mA)
PERCENT UNITS
-250
Offset Voltage Input Common Mode Voltage
-55°C TYPICAL PART
-100
25°C
-0.2 -0.4 -0.6 -0.8
INPUT BIAS (µA)
INPUT BIAS CURRENT (µA)
OFFSET VOLTAGE (µV)
-200 -300 -400 -500 INPUT COMMON MODE VOLTAGE 125°C
Output Saturation Voltage Load Current (Output Low)
OUTPUT SATURATION VOLTAGE OUTPUT SATURATION VOLTAGE
125°C 0.01 -55°C
0.001 0.01
LOAD CURRENT (mA)
18012 18012
Distribution, (NPN Stage)
Supply Current Supply Voltage
AMPLIFIER
125°C
25°C
-55°C
TOTAL SUPPLY VOLTAGE
18012
18012
Input Bias Current Common Mode Voltage
25°C 125°C -55°C
Input Bias Current Temperature
ACTIVE
ACTIVE
-1.0
INPUT COMMON MODE VOLTAGE
-0.1 TEMPERATURE (°C)
18012
18012
Output Saturation Voltage Load Current (Output High)
125°C
25°C
0.01 -55°C 25°C
18012
0.001 0.01
LOAD CURRENT (mA)
18012
18012f
LT1801/LT1802 TYPICAL PERFOR CHARACTERISTICS
Minimum Supply Voltage
OUTPUT SHORT-CIRCUIT CURRENT (mA)
CHANGE OFFSET VOLTAGE (mV)
125°C -55°C SINKING
CHANGE OFFSET VOLTAGE (µV)
-55°C
25°C -0.2 -0.4 -0.6 TOTAL SUPPLY VOLTAGE
125°C
Open-Loop Gain
2000 CHANGE OFFSET VOLTAGE (µV) 1600 1200 -400 -800 -1200 -1600 -2000 OUTPUT VOLTAGE 2000
CHANGE OFFSET VOLTAGE (µV)
1200 -400 -800
CHANGE OFFSET VOLTAGE (mV)
Warm-Up Drift Time
OFFSET VOLTAGE (µV)
NOISE VOLTAGE (nV/Hz)
TYPICAL PART TIME AFTER POWER-UP (SECONDS) ±1.5V ±2.5V
18012
Output Short-Circuit Current Power Supply Voltage
25°C
Open-Loop Gain
2000 1600 1200 -400 -800 -1200 -1600 -2000
-55°C 125°C 25°C
SOURCING
POWER SUPPLY VOLTAGE (±V)
OUTPUT VOLTAGE
18012
18012
18012
Open-Loop Gain
1600
Offset Voltage Output Current
-55°C
-0.5 25°C -1.0 -1.5
125°C
-1200 -1600
-2000
OUTPUT VOLTAGE
-2.0 OUTPUT CURRENT (mA)
18012
18012
Input Noise Voltage Frequency
ACTIVE 4.25V
ACTIVE 2.5V FREQUENCY (kHz)
18012
0.01
18012
18012f
LT1801/LT1802 TYPICAL PERFOR CHARACTERISTICS
Input Current Noise Frequency
INPUT NOISE VOLTAGE (nV)
NOISE CURRENT (pA/Hz)
GAIN BANDWIDTH (MHz)
ACTIVE 4.25V ACTIVE 2.5V
0.01
FREQUENCY (kHz)
Gain Bandwidth Phase Margin Temperature
PRODUCT ±2.5V
GAIN BANDWIDTH (MHz)
OPEN-LOOP GAIN (dB)
SLEW RATE (V/µs)
PRODUCT PHASE MARGIN ±2.5V PHASE MARGIN
TEMPERATURE (°C)
18012
Gain Frequency
10pF
GAIN (dB)
GAIN (dB)
FREQUENCY (MHz)
18012
0.1Hz 10Hz Input Voltage Noise
2000 1000
Gain Bandwidth Phase Margin Supply Voltage
25°C GAIN BANDWIDTH PRODUCT
PHASE MARGIN (DEG)
PHASE MARGIN
-1000
-2000 TIME (SECONDS) TOTAL SUPPLY VOLTAGE
18012
18012
Slew Rate Temperature
Gain Phase Frequency
PHASE ±2.5V FREQUENCY (MHz) GAIN
PHASE (DEG)
±2.5V
PHASE MARGIN (DEG)
TEMPERATURE (°C)
18012
0.01
-100
18012
Gain Frequency
10pF
±2.5V
±2.5V
FREQUENCY (MHz)
18012
18012
18012f
LT1801/LT1802 TYPICAL PERFOR CHARACTERISTICS
Output Impedance Frequency
OUTPUT IMPEDANCE
COMMON MODE REJECTION RATIO (dB)
POWER SUPPLY REJECTION RATIO (dB)
±2.5V
0.01
0.001
FREQUENCY (MHz)
Series Output Resistor Capacitive Load
OVERSHOOT
OVERSHOOT
1000 CAPACITIVE LOAD (pF) 10000
18012
DISTORTION (dBc)
1000 CAPACITIVE LOAD (pF)
Distortion Frequency
VOUT 2VP-P 150, -100 -110 0.01 FREQUENCY (MHz)
18012
DISTORTION (dBc)
150,
OUTPUT VOLTAGE SWING (VP-P)
18012
18012
Common Mode Rejection Ratio Frequency
0.01
Power Supply Rejection Ratio Frequency
0.001 0.01 FREQUENCY (MHz)
18012
25°C NEGATIVE SUPPLY POSITIVE SUPPLY
FREQUENCY (MHz)
18012
Series Output Resistor Capacitive Load
-100
Distortion Frequency
VOUT 2VP-P 150,
150,
FREQUENCY (MHz)
18012
10000
-110 0.01
Maximum Undistorted Output Signal Frequency
100k FREQUENCY (Hz)
18012
18012f
LT1801/LT1802 TYPICAL PERFOR CHARACTERISTICS
Large-Signal Response Small-Signal Response
1V/DIV
Large-Signal Response
2V/DIV
100ns/DIV
50mV/DIV
18012
50ns/DIV
18012
Small-Signal Response
50mV/DIV
200ns/DIV
18012
50ns/DIV
18012
Output Overdriven Recovery
1V/DIV VOUT 2V/DIV
100ns/DIV
18012
18012f
LT1801/LT1802
APPLICATIO ATIO
Circuit Description
LT1801/LT1802 have input output signal range that covers from negative power supply positive power supply. Figure depicts simplified schematic amplifier. input stage comprised differential amplifiers, stage Q1/Q2 stage that active over different ranges common mode input voltage. differential pair active between negative supply approximately 1.2V below positive supply. input voltage moves closer toward positive supply, transistor will steer tail current current mirror Q6/Q7, activating differential pair pair becomes inactive rest input common mode range positive supply. Also input stage, devices cancel bias current input pair. When Q1-Q2 active, current controlled same current Q1-Q2, thus base current nominally equal base current input devices. base current then mirrored devices Q17-Q19 cancel base current input devices Q1-Q2.
ESDD2
ESDD1
ESDD4 ESDD3
Figure LT1801/LT1802 Simplified Schematic Diagram
pair complementary common emitter stages Q14/ that enable output swing from rail rail constructs output stage. capacitors form local feedback loops that lower output impedance high frequency. These devices fabricated Linear Technology's proprietary high-speed complementary bipolar process. Power Dissipation LT1801 amplifier offered small package, SO-8, which thermal resistance 190°C/W, there need ensure that die's junction temperature should exceed 150°C. Junction temperature calculated from ambient temperature power dissipation thermal resistance power dissipation function supply voltage, output voltage load resistance. given supply voltage, worst-case power dissipation PDMAX occurs maximum supply current output
VBIAS
BUFFER OUTPUT BIAS
18012
18012f
LT1801/LT1802
APPLICATIO ATIO
PDMAX ISMAX) (VS/2)2/RL
voltage half either supply voltage maximum swing less than supply voltage). PDMAX given Example: LT1801 SO-8 package operating supplies driving load, worst-case power dissipation given PDMAX 4.5mA) (2.5)2/50 0.045 0.125 0.17W both amplifiers loaded simultaneously, then total power dissipation 0.34W. maximum ambient temperature that part allowed operate (PDMAX 190°C/W) 150°C (0.34W 190°C/W) 85°C Input Offset Voltage offset voltage will change depending upon which input stage active. input stage active from negative supply rail 1.2V from positive supply rail, then input stage activated remaining input range positive supply rail during which stage remains inactive. offset voltage typically less than 75µV range that input stage active. Input Bias Current LT1801/LT1802 employ patent-pending technique trim input bias current less than 250nA input common mode voltage 0.2V above negative supply rail 1.2V positive rail. input offset voltage input bias current LT1801/LT1802 provide precision performance especially high source impedance applications.
Output LT1801/LT1802 deliver large output current, short-circuit current limit around 50mA prevent damage device. Attention must paid keep junction temperature below absolute maximum rating 150°C (refer Power Dissipation section) when output continuously short circuited. output amplifier reverse-biased diodes connected each supply. output forced beyond either supply, unlimited current will flow through these diodes. current transient limited several hundred total supply voltage less than 12.6V, absolute maximum rating, damage will occur device. Overdrive Protection When input voltage exceeds power supplies, pairs crossing diodes will prevent output from reversing polarity. input voltage exceeds either power supply 700mV, diode D1/D2 D3/D4 will turn keep output proper polarity. phase reversal protection perform properly, input current must limited less than 10mA. amplifier severely overdriven, external resistor should used limit overdrive current. LT1801/LT1802's input stages also protected against large differential input voltage 1.4V higher pair back-back diodes D5/D8 prevent emitterbase breakdown input transistors. current these diodes should limited less than 10mA when they active. worst-case differential input voltage usually occurs when input driven while output shorted ground unity gain configuration. addition, amplifier protected against strikes pins pair protection diodes each that connected power supplies shown Figure
18012f
LT1801/LT1802
APPLICATIO ATIO
Capacitive Load
LT1801/LT1802 optimized high bandwidth, power precision applications. They drive capacitive load about 75pF unity-gain configuration, more higher gain. When driving larger capacitive load, resistor should connected between output capacitive load avoid ringing oscillation. feedback should still taken from output that resistor will isolate capacitive load ensure stability. Graphs capacitive loads indicate transient response amplifier when driving capacitive load with specified series resistor.
Feedback Components When feedback resistors used gain, care must taken ensure that pole formed feedback resistors total capacitance inverting input does degrade stability. instance, LT1801/ LT1802 noninverting gain setup with resistors capacitance (part plus board) will probably oscillate. pole formed 12.7MHz that will reduce phase margin degrees when crossover frequency amplifier around 20MHz. capacitor higher connected across feedback resistor will eliminate ringing oscillation.
18012f
LT1801/LT1802
TYPICAL APPLICATIO
Single Supply, 1MHz, Order Butterworth Filter circuit shown first page this data sheet makes voltage operation wide bandwidth LT1801 create accurate 1MHz order lowpass filter powered from supply. amplifiers configured inverting mode lowest distortion output swing rail-to-rail maximum dynamic range. Also first page this data sheet, graph displays frequency response filter. Stopband attenuation greater than 100dB 50MHz. With 2.25VP-P, 250kHz input signal, filter harmonic distortion products less than 85dBc. Worst case output offset voltage less than 6mV. Fast Current Sense Amplifier simple, fast current sense amplifier Figure suitable quickly responding out-of-range currents. circuit amplifies voltage across sense resistor gain resulting conversion gain 2V/A. -3dB bandwidth circuit 4MHz, uncertainty less than 4mA. minimum output voltage 60mV, corresponding 30mA. large-signal response circuit shown Figure
52.3
VOUT f-3dB 4MHz UNCERTAINTY VOS,
Figure Fast Current Sense
500mV/DIV
50ns/DIV
Figure Current Sense Amplifier Large-Signal Response
52.3
LT1801
VOUT
18012
18012
18012f
LT1801/LT1802
TYPICAL APPLICATIO
Single Supply Laser Driver Amplifier Figure shows LT1801 used laser driver application. reasons LT1801 well suited this control task that 2.3V operation ensures that will awaked during power-up operated before circuit otherwise cause significant current flow 2.1V threshold laser diode. Driving noninverting input LT1801 voltage will control turning high current transistor, FMMT619 laser diode. current equal VIN/R1 flows through laser diode. LT1801 offset voltage input bias current allows control current that flows through laser diode precisely. overall circuit Volt V-to-I converter. Frequency compensation components selected fast zero-overshoot time domain response avoid overcurrent conditions laser. time domain response this circuit, measured given 500mV 230ns input pulse, shown Figure While circuit capable operation, laser diode transistor thermally limited power dissipation, they must operated duty cycles.
Figure Single Supply Laser Driver Amplifier
100mA/DIV
Figure 500mA Pulse Response
FLOAT
39pF
LT1801
ZETEX FMMT619 LASER INFINEON SFH495
18012
50ns/DIV
18012
18012f
LT1801/LT1802
PACKAGE DESCRIPTIO
0.010 0.020 (0.254 0.508) 0.008 0.010 (0.203 0.254)
0.014 0.019 (0.355 0.483) *DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
0.016 0.050 (0.406 1.270)
Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference 05-08-1610)
0.189 0.197* (4.801 5.004) 0.228 0.244 (5.791 6.197) 0.150 0.157** (3.810 3.988) 0.053 0.069 (1.346 1.752) 0.004 0.010 (0.101 0.254) 0.050 (1.270)
1298
18012f
LT1801/LT1802
PACKAGE DESCRIPTIO
Package 14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference 05-08-1610)
0.010 0.020 (0.254 0.508)
0.008 0.010 (0.203 0.254)
0.016 0.050 (0.406 1.270)
*DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
0.337 0.344* (8.560 8.738) 0.228 0.244 (5.791 6.197) 0.150 0.157** (3.810 3.988) 0.053 0.069 (1.346 1.752) 0.004 0.010 (0.101 0.254) 0.014 0.019 (0.355 0.483) 0.050 (1.270)
1298
18012f
LT1801/LT1802
TYPICAL APPLICATIO
Power High Voltage Amplifier Certain materials used optical applications have characteristics that change presence strength electric field. voltage applied across these materials should precisely controlled maintain desired properties, sometimes high 100's volts. materials conductive represent capacitive load. circuit Figure shows LT1801 used amplifier capable 250V output swing providing
130V
0.1µF
4.99k
LT1801
150V 39pF 200k 4.99k
-130V
18012
Figure Power, High Voltage Amplifier
RELATED PARTS
PART NUMBER LT1399 LT1498/LT1499 LT1630/LT1631 LT1800 LT1806/LT1807 LT1809/LT1810 DESCRIPTION Triple 300MHz Current Feedback Amplifier Dual/Quad 10MHz, 6Vµs Rail-to-Rail Input Output C-LoadOp Amps Dual/Quad 30MHz, 10V/µs Rail-to-Rail Input Output Amps 80MHz, 25V/µs Power Rail-to-Rail Input/Output Precision Single/Dual 325MHz, 140V/µs Rail-to-Rail Input Output Amps Single/Dual 180MHz Rail-to-Rail Input/Output Amps COMMENTS 0.1dB Gain Flatness 150MHz, Shutdown High Accuracy, 475µV VOS(MAX), 4µV/°C Drift High Accuracy, 525µV VOS(MAX), 70mA Output Current, Supply Current 4.4mA Amplifier Single Version LT1801/LT1802 High Accuracy, 550µV VOS(MAX), Noise 3.5nV/Hz, Distortion -80dB 5MHz, Power-Down (LT1806) 350V/µs Slew Rate, Distortion -90dBc 5MHz, Power-Down (LT1809)
C-Load trademark Linear Technology Corporation.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900 FAX: (408) 434-0507
precise output voltage. When signal present, output sits about mid-supply. Transistors create bias voltages which forced into quiescent current degeneration resistors When transient signal arrives VIN, output moves causes current change depending signal polarity. current, limited clipping LT1801 output total emitter degeneration, mirrored output devices drive capacitive load. LT1801 output then returns near mid-supply, providing precise output voltage load. attention limit current output devices minimizes power dissipation thus allowing dense layout, inherits better reliability. Figure shows time domain response amplifier providing 200V output swing into 100pF load.
VOUT MATERIAL UNDER ELECTRIC FIELD 100pF
2V/DIV
VOUT/VIN -100 ±130V SUPPLY 130µA OUTPUT SWING ±128.8V OUTPUT OFFSET 20mV OUTPUT SHORT-CIRCUIT CURRENT RISE TIME 8µs, 200V OUTPUT STEP SMALL-SIGNAL BANDWIDTH 150kHz SEMI MPSA42 SEMI MPSA92
VOUT 50V/DIV
10µs/DIV
18012
Figure Large-Signal Time Domain Response Amplifier
18012f LT/TP 0702 PRINTED
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2002

LT1801/LT1802 Dual/Quad 80MHz, 25V/µs Power Rail-to-Rail Input Output

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