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LT1800 80MHz, 25V/s Low Power Rail-to-Rail Input and Output Precision Op Amp
FEATURES
s s s s s s s s s s s s
DESCRIPTIO
s
Gain Bandwidth Product: 80MHz Input Common Mode Range Includes Both Rails Output Swings Rail-to-Rail Low Quiescent Current: 2mA Max Input Offset Voltage: 350V Max Input Bias Current: 250nA Max Low Voltage Noise: 8.5nV/Hz Slew Rate: 25V/s 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: - 40C to 85C
The LT (R)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 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.
APPLICATIO S
s s s s s
Low Voltage, High Frequency Signal Processing Driving A/D Converters Rail-to-Rail Buffer Amplifiers Active Filters Video Line Driver
TYPICAL APPLICATIO
Single Supply 1A Laser Driver Amplifier
5V
Laser Driver Amplifier 500mA Pulse Response
-
+
VIN DO NOT FLOAT
R3 10 LT1800 C1 39pF R2 330
Q1 ZETEX FMMT619 IR LASER INFINEON SFH495
100mA/DIV
R1 1
1800 TA01
U
50ns/DIV
1800 TA02
U
U
1800f
1
LT1800
ABSOLUTE
AXI U
RATI GS
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) .. - 40C to 85C
PACKAGE/ORDER I FOR ATIO
TOP VIEW NC 1 -IN 2 +IN 3 VS- 4 8 NC VS+ VOUT NC
ORDER PART NUMBER
7 6 5
+IN 3
S8 PART MARKING 1800 1800I
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 190C/ W
S5 PACKAGE 5-LEAD PLASTIC SOT-23
TJMAX = 150C, JA = 250C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
TA = 25C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM = 0V VCM = 0V (SOT-23) VCM = VS VCM = VS (SOT-23) VCM = 0V to VS - 1.5V VCM = 1V VCM = VS VCM = 1V VCM = VS 0.1Hz to 10Hz f = 10kHz f = 10kHz f = 100kHz VS = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2 VS = 5V, VO = 1V to 4V, RL = 100 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 35 3.5 30 85 78 0 80 97 2.3 2.5 MIN TYP 75 300 0.5 0.7 20 25 500 25 25 1.4 8.5 1 2 85 8 85 105 97 VS MAX 350 750 3 3.5 180 250 1500 200 200 UNITS V V mV mV V nA nA nA nA VP-P nV/Hz pA/Hz pF V/mV V/mV V/mV dB dB V dB V
1800f
VOS IB IOS
Input Offset Shift Input Bias Current Input Offset Current Input Noise Voltage
en in CIN AVOL
Input Noise Voltage Density Input Noise Current Density Input Capacitance Large-Signal Voltage Gain
CMRR
Common Mode Rejection Ratio Input Common Mode Range
PSRR
Power Supply Rejection Ratio Minimum Supply Voltage (Note 6)
2
-+
LT1800CS8 LT1800IS8
U
U
W
WW
U
W
(Note 1)
Specified Temperature Range (Note 5) ... - 40C to 85C Junction Temperature .......................................... 150C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
TOP VIEW VOUT 1 VS
-2
ORDER PART NUMBER
5 VS+ 4 -IN
LT1800CS5 LT1800IS5 S5 PART MARKING LTRN LTRP
+ -
LT1800
ELECTRICAL CHARACTERISTICS
TA = 25C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER VOL Output Voltage Swing Low (Note 7) CONDITIONS No Load ISINK = 5mA ISINK = 20mA No Load ISOURCE = 5mA ISOURCE = 20mA VS = 5V VS = 3V 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 = 150 VS = 5V, AV = + 2, RL = 150 MIN 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 UNITS mV mV mV mV mV mV mA mA mA MHz V/s MHz dBc ns % Deg
VOH
Output Voltage Swing High (Note 7)
ISC IS GBW SR FPBW HD tS G
Short-Circuit Current Supply Current per Amplifier Gain Bandwidth Product Slew Rate Full Power Bandwidth Harmonic Distortion Settling Time Differential Gain (NTSC) Differential Phase (NTSC)
20 20 40 13
2
The q denotes the specifications which apply over the temperature range of 0C TA 70C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM = 0V VCM = 0V (SOT-23) VCM = VS VCM = VS (SOT-23) VCM = 0V to VS - 1.5V 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 = 100 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 No Load ISINK = 5mA ISINK = 20mA No Load ISOURCE = 5mA ISOURCE = 20mA VS = 5V VS = 3V Frequency = 2MHz VS = 5V, AV = - 1, RL = 1k, VO = 4VP-P MIN
q q q q q q q q q q q q q q q q q q q q q q q q q q q q q
VOS VOS TC IB IOS AVOL
Input Offset Shift Input Offset Voltage Drift (Note 8) Input Bias Current Input Offset Current Large-Signal Voltage Gain
CMRR
Common Mode Rejection Ratio Input Common Mode Range Power Supply Rejection Ratio Minimum Supply Voltage (Note 6) Output Voltage Swing Low (Note 7)
PSRR VOL
30 3 25 82 74 0 74
TYP 125 300 0.6 0.7 30 1.5 50 550 25 25 75 6 75 101 93 91 2.3 14 100 300 25 150 600 40 30 2 75 22
MAX 500 1250 3.5 3.75 275 5 300 1750 250 250
VS 2.5 60 200 550 80 300 950
VOH
Output Voltage Swing High (Note 7)
ISC IS GBW SR
Short-Circuit Current Supply Current per Amplifier Gain Bandwidth Product Slew Rate
20 20 35 11
2.75
UNITS V V mV mV V V/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/s
1800f
3
LT1800
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER VOS Input Offset Voltage
The q denotes the specifications which apply over the temperature range of - 40C TA 85C. VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 5)
CONDITIONS VCM = 0V VCM = 0V (SOT-23) VCM = VS VCM = VS (SOT-23) VCM = 0V to VS - 1.5V 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 = 1.5V to 3.5V, RL = 100 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 No Load ISINK = 5mA ISINK = 10mA No Load ISOURCE = 5mA ISOURCE = 10mA VS = 5V VS = 3V Frequency = 2MHz VS = 5V, AV = - 1, RL = 1k, VO = 4V
q q q q q q q q q q q q q q q q q q q q q q q q q q q q q
MIN
TYP 175 400 0.75 0.9 30 1.5 50 600 25 25
MAX 700 2000 4 4 300 5 400 2000 300 300
UNITS V V mV mV V V/C nA nA nA nA V/mV V/mV V/mV dB dB
VOS VOS TC IB IOS AVOL
Input Offset Shift Input Offset Voltage Drift (Note 8) Input Bias Current Input Offset Current Large-Signal Voltage Gain
25 2.5 20 81 73 0 73
65 6 65 101 93 VS 90 2.3 15 105 170 25 150 300 2.5 70 210 400 90 350 700
CMRR
Common Mode Rejection Ratio Input Common Mode Range
V dB V mV mV mV mV mV mV mA mA
PSRR VOL
Power Supply Rejection Ratio Minimum Supply Voltage (Note 6) Output Voltage Swing Low (Note 7)
VOH
Output Voltage Swing High (Note 7)
ISC IS GBW SR
Short-Circuit Current Supply Current per Amplifier Gain Bandwidth Product Slew Rate
12.5 12.5 30 10
30 30 2.1 70 18 3
mA MHz V/s
TA = 25C, VS = 5V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS 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+ 0.1Hz to 10Hz f = 10kHz f = 10kHz f = 100kHz MIN TYP 150 400 0.7 1 30 25 400 20 20 1.4 8.5 1 2 MAX 500 1000 3.5 4.5 475 350 1500 250 250 UNITS V V mV mV V nA nA nA nA VP-P nV/Hz pA/Hz pF
1800f
VOS IB IOS
Input Offset Shift Input Bias Current Input Offset Current Input Noise Voltage
en in CIN
Input Noise Voltage Density Input Noise Current Density Input Capacitance
4
LT1800
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER AVOL CMRR PSRR VOL Large-Signal Voltage Gain Common Mode Rejection Ratio Input Common Mode Range Power Supply Rejection Ratio Output Voltage Swing Low (Note 7)
TA = 25C, VS = 5V, VCM = 0V, VOUT = 0V, unless otherwise noted.
CONDITIONS VO = -4V to 4V, RL = 1k VO = -2V to 2V, RL = 100 VCM = VS- to 3.5V VS+ = 2.5V to 10V, VS- = 0V No Load ISINK = 5mA ISINK = 20mA No Load ISOURCE = 5mA ISOURCE = 20mA 30 Frequency = 2MHz AV = - 1, RL = 1k, VO = 4V, Measured at VO = 2V VO = 8VP-P AV = 1, RL = 1k, VO = 2VP-P, fC = 500kHz 0.01%, VSTEP = 5V, AV = 1V, RL = 1k AV = + 2, RL = 150 AV = + 2, RL = 150 MIN 25 2.5 85 VS
-
TYP 70 7 109
MAX
UNITS V/mV V/mV dB
VS 97 15 85 225 17 130 450 50 1.8 70 23 0.9 -75 300 0.35 0.2
+
V dB mV mV mV mV mV mV mA mA MHz V/s MHz dBc ns % Deg
80
60 170 450 70 260 750 2.75
VOH
Output Voltage Swing High (Note 7)
ISC IS GBW SR FPBW HD tS G
Short-Circuit Current Supply Current per Amplifier Gain Bandwidth Product Slew Rate Full Power Bandwidth Harmonic Distortion Settling Time Differential Gain (NTSC) Differential Phase (NTSC)
The q denotes the specifications which apply over the temperature range of 0C TA 70C. VS = 5V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM = VS- VCM = VS- (SOT-23) VCM = VS+ VCM = VS+ (SOT-23) VCM = VS- to VS+ - 1.5V VCM = VS- + 1V VCM = VS+ - 0.2V VCM = VS- + 1V VCM = VS+ - 0.2V VO = -4V to 4V, RL = 1k VO = -2V to 2V, RL = 100 VCM = VS- to 3.5V VS+ = 2.5V to 10V, VS- = 0V
q q q q q q q q q q q q q q q q q q q q q
MIN
TYP 200 450 0.75 1 45 1.5 30 450 25 25
MAX 800 1500 4 5 675 5 400 1750 300 300
UNITS V V mV mV V V/C nA nA nA nA V/mV V/mV dB
VOS VOS TC IB IOS AVOL CMRR PSRR VOL
Input Offset Shift Input Offset Voltage Drift (Note 8) Input Bias Current Input Offset Current Large-Signal Voltage Gain Common Mode Rejection Ratio Input Common Mode Range Power Supply Rejection Ratio Output Voltage Swing Low (Note 7)
20 2 82 VS- 74
55 5 105 VS+ 91 17 105 250 25 150 600 70 210 575 90 310 975
V dB mV mV mV mV mV mV
1800f
No Load ISINK = 5mA ISINK = 20mA No Load ISOURCE = 5mA ISOURCE = 20mA
VOH
Output Voltage Swing High (Note 7)
5
LT1800
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER ISC IS GBW SR Short-Circuit Current Supply Current per Amplifier Gain Bandwidth Product Slew Rate
The q denotes the specifications which apply over the temperature range of 0C TA 70C. VS = 5V, VCM = 0V, VOUT = 0V, unless otherwise noted.
CONDITIONS
q q
MIN 25
TYP 45 2.4 70 20
MAX 3.5
UNITS mA mA MHz V/s
Frequency = 2MHz AV = - 1, RL = 1k, VO = 4V, Measured at VO = 2V
q q
The q denotes the specifications which apply over the temperature range of - 40C TA 85C. VS = 5V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM = VS- VCM = VS- (SOT-23) VCM = VS+ VCM = VS+ (SOT-23) VCM = VS- to VS+ - 1.5V VCM = VS- + 1V VCM = VS+ - 0.2V VCM = VS- + 1V VCM = VS+ - 0.2V VO = -4V to 4V, RL = 1k VO = -1V to 1V, RL = 100 VCM = VS- to 3.5V VS+ = 2.5V to 10V, VS- = 0V No Load ISINK = 5mA ISINK = 10mA No Load ISOURCE = 5mA ISOURCE = 10mA
q q q q q q q q q q q q q q q q q q q q q q q
MIN
TYP 350 500 0.75 1 50 1.5 50 450 25 25
MAX 900 2250 4.5 5.5 750 5 450 2000 350 350
UNITS V V mV mV V V/C nA nA nA nA V/mV V/mV dB
VOS VOS TC IB IOS AVOL CMRR PSRR VOL
Input Offset Shift Input Offset Voltage Drift (Note 8) Input Bias Current Input Offset Current Large-Signal Voltage Gain Common Mode Rejection Ratio Input Common Mode Range Power Supply Rejection Ratio Output Voltage Swing Low (Note 7)
16 2 81 VS
-
55 5 104 VS+ 90 15 105 170 25 150 300 80 220 400 100 350 700 4
V dB mV mV mV mV mV mV mA mA MHz V/s
73
VOH
Output Voltage Swing High (Note 7)
ISC IS GBW SR
Short-Circuit Current Supply Current per Amplifier Gain Bandwidth Product Slew Rate Frequency = 2MHz AV = - 1, RL = 1k, VO = 4V, Measured at VO = 2V
12.5
30 2.6 65 15
q q
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 - 40C to 85C.
Note 5: The LT1800C is guaranteed to meet specified performance from 0C to 70C. The LT1800C is designed, characterized and expected to meet specified performance from -40C to 85C but is not tested or QA sampled at these temperatures. The LT1800I is guaranteed to meet specified performance from -40C to 85C. 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 TYPICAL PERFOR A CE CHARACTERISTICS
VOS Distribution, VCM = 0V (SO-8, PNP Stage)
45 40
PERCENT OF UNITS (%)
VS = 5V, 0V VCM = 0V
PERCENT OF UNITS (%)
30 25 20 15 10 5 0 -250 -150 -50 50 150 INPUT OFFSET VOLTAGE (V) 250
1800 G01
30 25 20 15 10 5 0 -2000 -1200 -400 400 1200 INPUT OFFSET VOLTAGE (V) 2000
1800 G02
PERCENT OF UNITS (%)
35
VOS Distribution, VCM = 5V (SOT-23, NPN Stage)
35 30 PERCENT OF UNITS (%) 25 20 15 10 5 0 -2500
0
VS = 5V, 0V VCM = 5V
SUPPLY CURRENT (mA)
OFFSET VOLTAGE (V)
-1500 -500 500 1500 INPUT OFFSET VOLTAGE (V)
Input Bias Current vs Common Mode Voltage
1.0 0.8 VS = 5V, 0V TA = 25C TA = 125C TA = -55C
INPUT BIAS (A)
INPUT BIAS CURRENT (A)
0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0
0.6 0.5 0.4 0.3 0.2 0.1 0
NPN ACTIVE VS = 5V, 0V VCM = 5V
OUTPUT SATURATION VOLTAGE (V)
-1
0 2 3 4 5 1 INPUT COMMON MODE VOLTAGE (V)
UW
1800 G39
1800 G05
VOS Distribution, VCM = 5V (SO-8, NPN Stage)
45 40 35 VS = 5V, 0V VCM = 5V
40 35 30 25 20 15 10 5
VOS Distribution, VCM = 0V (SOT-23, PNP Stage)
VS = 5V, 0V VCM = 0V
0 -1250
750 -750 -250 250 INPUT OFFSET VOLTAGE (V)
1250
1800 G38
Supply Current vs Supply Voltage
4 500 400 3 TA = 125C 300 200 100 0 -100
Offset Voltage vs Input Common Mode Voltage
TA = -55C VS = 5V, 0V TYPICAL PART
TA = 25C
2
TA = 25C
TA = -55C 1
-200 -300 -400 TA = 125C
2500
-500 0 1 2 3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V)
1800 G03
0
1 3 4 2 INPUT COMMON MODE VOLTAGE (V)
5
1800 G04
Input Bias Current vs Temperature
0.8 0.7
10
Output Saturation Voltage vs Load Current (Output Low)
VS = 5V, 0V
1
0.1 TA = 125C 0.01 TA = -55C
PNP ACTIVE VS = 5V, 0V VCM = 1V
TA = 25C
6
-0.1 20 -60 -40 -20 0 40 TEMPERATURE (C)
60
80
1800 G06
0.001 0.01
1 10 0.1 LOAD CURRENT (mA)
100
1800 G07
1800f
7
LT1800 TYPICAL PERFOR A CE CHARACTERISTICS
Output Saturation Voltage vs Load Current (Output High)
10 OUTPUT SATURATION VOLTAGE (V) VS = 5V, 0V
CHANGE IN OFFSET VOLTAGE (mV)
0.4 0.2
TA = -55C
OUTPUT SHORT-CIRCUIT CURRENT (mA)
1
0.1 TA = 125C
0.01 TA = -55C TA = 25C
0.001 0.01
1 10 0.1 LOAD CURRENT (mA)
Open-Loop Gain
2000
CHANGE IN OFFSET VOLTAGE (V)
CHANGE IN OFFSET VOLTAGE (V)
CHANGE IN OFFSET VOLTAGE (V)
1600 1200 800 400 0 -400 -800 -1200 -1600 -2000 0 0.5 RL = 100
RL = 1k
1.5 2 1 OUTPUT VOLTAGE (V)
Offset Voltage vs Output Current
2.0 VS = 5V 120 110
CHANGE IN OFFSET VOLTAGE (mV)
1.5
0.5 0 -0.5 TA = 25C -1.0 -1.5
TA = -55C
OFFSET VOLTAGE (V)
1.0
100 90 80 70 60 50 40 TYPICAL PART 0 20 80 100 120 60 TIME AFTER POWER-UP (SECONDS) 40 140 VS = 1.5V VS = 2.5V
NOISE VOLTAGE (nV/Hz)
TA = 125C
-2.0 15 30 -60 -45 -30 -15 0 OUTPUT CURRENT (mA)
8
UW
VS = 3V, 0V RL TO GND 2.5
45
1800 G14
Minimum Supply Voltage
0.6 70 60 50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 -70
Output Short-Circuit Current vs Power Supply Voltage
TA = 25C TA = 125C TA = -55C SINKING VS = 5V, 0V TA = -55C TA = 125C TA = 25C 1.5 2 4 2.5 4.5 3.5 3 POWER SUPPLY VOLTAGE (V) 5 SOURCING
TA = 25C 0 -0.2 -0.4 -0.6
TA = 125C
100
1800 G08
0
1.5
2 2.5 3 3.5 4 4.5 TOTAL SUPPLY VOLTAGE (V)
5
5.5
1800 G09
1800 G10
Open-Loop Gain
2000 1600 1200 800 400 0 -400 -800 -1200 -1600 RL = 100 RL = 1k VS = 5V, 0V RL TO GND 2000 1600 1200 800 400 0 -400 -800
Open-Loop Gain
VS = 5V RL TO GND
RL = 1k
RL = 100
-1200 -1600
3
1800 G11
-2000
-2000 0 0.5 1 1.5 2 2.5 3 3.5 4 OUTPUT VOLTAGE (V) 4.5 5
-5 -4 -3 -2 -1 0 1 2 3 OUTPUT VOLTAGE (V)
4
5
1800 G12
1800 G13
Warm-Up Drift vs Time (LT1800S8)
60 VS = 5V 50 40 30 20 10
Input Noise Voltage vs Frequency
VS = 5V, 0V
NPN ACTIVE VCM = 4.25V
PNP ACTIVE VCM = 2.5V 0.1 1 10 FREQUENCY (kHz) 100
1800 G16
60
0 0.01
1800 G15
1800f
LT1800 TYPICAL PERFOR A CE CHARACTERISTICS
Input Current Noise vs Frequency
3.0 2.5
NOISE CURRENT (pA/Hz)
VS = 5V, 0V
OUTPUT NOISE VOLTAGE (nV)
GAIN BANDWIDTH (MHz)
2.0 1.5 1.0 0.5 NPN ACTIVE VCM = 4.25V PNP ACTIVE VCM = 2.5V
0 0.01
0.1
1 10 FREQUENCY (kHz)
Gain Bandwidth and Phase Margin vs Temperature
100 90 80 GBW PRODUCT VS = 2.5V
GAIN BANDWIDTH (MHz)
OPEN-LOOP GAIN (dB)
SLEW RATE (V/s)
70 60 50
GBW PRODUCT VS = 5V PHASE MARGIN VS = 2.5V PHASE MARGIN VS = 5V 60 50 40 30 20
-55 -35 -15
5 25 45 65 TEMPERATURE (C)
10 85 105 125
1800 G20
Gain vs Frequency (AV = 1)
12 RL = 1k 9 CL = 10pF AV = 1 6 18
OUTPUT IMPEDANCE ()
GAIN (dB)
GAIN (dB)
3 0 -3 -6 -9 -12 0.1 1 10 FREQUENCY (MHz) VS = 5V
VS = 2.5V
UW
1800 G17
0.1Hz to 10Hz Output Voltage Noise
2000 VS = 5V, 0V 100 90 1000 80 70 60
Gain Bandwidth and Phase Margin vs Supply Voltage
TA = 25C GAIN BANDWIDTH PRODUCT
PHASE MARGIN (DEG)
0
60 PHASE MARGIN 50 40 30
-1000
-2000
20 0 1 2 3 4567 TIME (SECONDS) 8 9 10 0 1 2345678 TOTAL SUPPLY VOLTAGE (V) 9 10
100
1800 G18
1800 G19
Slew Rate vs Temperature
35 AV = -1 RF = RG = 1k RL = 1k
Gain and Phase vs Frequency
70 100 80 PHASE 50 40 30 20 10 0 -10 -20 VS = 2.5V VS = 5V 0.1 1 10 FREQUENCY (MHz) GAIN 60 40
PHASE (DEG)
VS = 2.5V
60
30 PHASE MARGIN (DEG)
25
VS = 5V
20 0 -20 -40 -60 -80
20
15
10 -55 -35 -15
5 25 45 65 85 105 125 TEMPERATURE (C)
1800 G21
-30 0.01
-100 100 300
1800 G22
Gain vs Frequency (AV = 2)
RL = 1k 15 CL = 10pF AV = 2 12 9 6 3 VS = 5V 0 -3 100 300 -6 0.1 1 10 FREQUENCY (MHz) 100 300 VS = 2.5V
Output Impedance vs Frequency
600 100 10 1 0.1 0.01 0.001 0.1 AV = 2 AV = 10 AV = 1 VS = 2.5V
1
10 FREQUENCY (MHz)
100
500
1800 G25
1800 G23
1800 G24
1800f
9
LT1800 TYPICAL PERFOR A CE CHARACTERISTICS
Common Mode Rejection Ratio vs Frequency
120
COMMON MODE REJECTION RATIO (dB) POWER SUPPLY REJECTION RATIO (dB)
VS = 5V, 0V
100 80 60 40 20 0 0.01
50 40 30 20 10 0 -10 0.001 0.01 0.1 1 FREQUENCY (MHz) 10 100
1800 G27
OVERSHOOT (%)
0.1
1 10 FREQUENCY (MHz)
Series Output Resistor vs Capacitive Load
60 55 50 45 VS = 5V, 0V AV = 2 -40 -50
DISTORTION (dBc)
OVERSHOOT (%)
40 35 30 25 20 15 10 5 0 10 ROS = RL = 50 100 1000 CAPACITIVE LOAD (pF) 10000
1800 G29
RL = 150, 2ND
DISTORTION (dBc)
ROS = 10 ROS = 20
Maximum Undistorted Output Signal vs Frequency
4.6
OUTPUT VOLTAGE SWING (VP-P)
4.5 4.4 AV = 2 4.3 AV = -1 4.2 4.1 4.0 3.9 1k VS = 5V, 0V RL = 1k 10k 100k 1M FREQUENCY (Hz) 10M
1800 G32
10
UW
1800 G26
Power Supply Rejection Ratio vs Frequency
90 80 70 60 NEGATIVE SUPPLY POSITIVE SUPPLY VS = 5V, 0V TA = 25C 60 55 50 45 40 35 30 25 20 15 10 5 0
Series Output Resistor vs Capacitive Load
VS = 5V, 0V AV = 1 ROS = 10
ROS = 20
ROS = RL = 50 10 100 1000 CAPACITIVE LOAD (pF) 10000
1800 G28
100
Distortion vs Frequency
VS = 5V, 0V AV = 1 VOUT = 2VP-P -40 -50 -60
Distortion vs Frequency
VS = 5V, 0V AV = 2 VOUT = 2VP-P RL = 150, 2ND -70 -80 -90 -100 RL = 1k, 3RD 10
1800 G30
-60 -70 -80 -90 -100 -110 0.01
RL = 1k, 2ND RL = 150, 3RD
RL = 1k, 2ND RL = 150, 3RD
RL = 1k, 3RD 0.1 1 FREQUENCY (MHz)
-110 0.01
0.1 1 FREQUENCY (MHz)
10
1800 G31
5V Large-Signal Response
5V Small-Signal Response
50mV/DIV 1V/DIV 0V
0V
VS = 5V, 0V AV = 1 RL = 1k
100ns/DIV
1800 G33
VS = 5V, 0V AV = 1 RL = 1k
50ns/DIV
1800 G34
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LT1800 TYPICAL PERFOR A CE CHARACTERISTICS
5V Large-Signal Response 5V Small-Signal Response Output Overdriven Recovery
2V/DIV 0V
VS = 5V AV = 1 RL = 1k
200ns/DIV
APPLICATIO S I FOR ATIO
Circuit Description
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+
V+
V- ESDD2 D1
+
I2 +IN
ESDD1
D6 D5 -IN ESDD4 V- Q16 Q17 Q18 V+ ESDD3
D8 D7
Q19
V-
Figure 1. LT1800 Simplified Schematic Diagram
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1800 G35
50mV/DIV 0V
VIN 1V/DIV 0V VOUT 2V/DIV 0V VS = 5V AV = 1 RL = 1k 50ns/DIV
1800 G36
VS = 5V, 0V AV = 2 RL = 1k
100ns/DIV
1800 G37
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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
R3
R4
R5
+
I1
Q11
Q12
Q13 C2
Q15
D2
Q5
VBIAS CC
+
I3 OUT V-
Q4 Q3
Q1 Q2 D3 Q10 D4 Q9 Q8 C1 BUFFER AND OUTPUT BIAS
Q7
Q6 R1 R2
1800 F01
Q14
11
LT1800
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 250C/W, JA. So there is a need to ensure that the die's junction temperature should not exceed 150C. Junction temperature TJ is calculated from the ambient temperature TA, power dissipation PD and thermal resistance JA: TJ = TA + (PD * JA) 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 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 * 250C/W) = 150C - (0.165W * 250C/W) = 108C 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
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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 75V 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 150C (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
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LT1800
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 10 to 50 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
APPLICATIO S I FOR ATIO
Single Supply 1A Laser Driver Amplifier
52.3
VOUT = 2 * IL f-3dB = 4MHz UNCERTAINTY DUE TO VOS, IB < 4mA
Figure 2. Fast 1A Current Sense
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-
0.1
+
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.
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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. 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 0.1 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 52.3 3V LT1800 VOUT 0V TO 2V 1k
1800 F02
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LT1800
TYPICAL APPLICATIO S
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 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.
500mV/DIV
0V
VS = 3V
50ns/DIV
Figure 3. Current Sense Amplifier Large-Signal Response
VIN 220pF
LT1800
470pF
VS/2
1800 F04
Figure 4. 3V, 1MHz, 4th Order Butterworth Filter
0 -20
GAIN (dB)
-40 -60 -80
-100 -120 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M
1800 F05
Figure 5. Frequency Response of Filter
14
+
-
+
-
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1800 F03
909 2.67k
47pF 1.1k 1.1k 2.21k 22pF 3V
LT1800
VOUT
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LT1800
PACKAGE DESCRIPTIO
0.62 MAX
0.95 REF
3.85 MAX 2.62 REF
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.20 BSC 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
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
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
0.016 - 0.050 (0.406 - 1.270)
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.
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S6 Package 6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 2.80 BSC 1.50 - 1.75 (NOTE 4) PIN ONE 0.30 - 0.45 TYP 5 PLCS (NOTE 3) 0.95 BSC 0.80 - 0.90 0.01 - 0.10 1.90 BSC
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) 0.053 - 0.069 (1.346 - 1.752) 8 0.004 - 0.010 (0.101 - 0.254) 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157** (3.810 - 3.988) 7 6 5
0.050 (1.270) BSC
SO8 1298
1
2
3
4
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LT1800
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 10k 0.1F Q5
4.99k
5V
Q1 R4 2k
Q2
R2 2k
LT1800
R5 2k Q3 Q4
VIN R1 2k C2 8pF 150V C1 39pF R3 200k 10k Q7 4.99k Q8 1k
-130V
1800 F06
Figure 6. Low Power, High Voltage Amplifier
RELATED PARTS
PART NUMBER LT1399 LT1498/LT1499 LT1630/LT1631 LT1801/LT1802 LT1806/LT1807 LT1809/LT1810 DESCRIPTION Triple 300MHz Current Feedback Amplifier Dual/Quad 10MHz, 6Vs Rail-to-Rail Input and Output C-LoadTM Op Amps Dual/Quad 30MHz, 10V/s Rail-to-Rail Input and Output Op Amps 80MHz, 25V/s Low Power Rail-to-Rail Input/Output Precision Op Amps Single/Dual 325MHz, 140V/s Rail-to-Rail Input and Output Op Amps Single/Dual 180MHz Rail-to-Rail Input/Output Op Amps COMMENTS 0.1dB Gain Flatness to 150MHz, Shutdown High DC Accuracy, 475V VOS(MAX), 4V/C Max Drift, Max Supply Current 2.2mA per Amp High DC Accuracy, 525V VOS(MAX), 70mA Output Current, Max Supply Current 4.4mA per Amplifier Dual/Quad Version of the LT1800 High DC Accuracy, 550V VOS(MAX), Low Noise 3.5nV/Hz, Low Distortion -80dB at 5MHz, Power-Down (LT1806) 350V/s Slew Rate, Low Distortion -90dBc at 5MHz, Power-Down (LT1809)
C-Load is a trademark of Linear Technology Corporation.
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
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1k Q6
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 3k 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 R6 2k VOUT R7 2k MATERIAL UNDER ELECTRIC FIELD 100pF
-
+
VIN 2V/DIV
AV = VOUT/VIN = -100 130V SUPPLY IQ = 130A OUTPUT SWING = 128.8V OUTPUT OFFSET 20mV OUTPUT SHORT-CIRCUIT CURRENT 3mA 10% TO 90% RISE TIME 8s, 200V OUTPUT STEP SMALL-SIGNAL BANDWIDTH 150kHz Q1, Q2, Q7, Q8: ON SEMI MPSA42 Q3, Q4, Q5, Q6: ON SEMI MPSA92
VOUT 50V/DIV
10s/DIV
1800 F07
Figure 7. Large-Signal Time Domain Response of the Amplifier
LT/TP 0402 2K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2001

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