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LT1783 1.25MHz, Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amp in SOT-23
FEATURES
s s s s s s s s s s s s s s
DESCRIPTIO
Operates with Inputs Above V + Rail-to-Rail Input and Output Micropower: 300A Supply Current Max Operating Temperature Range: - 40C to 125C Low Profile (1mm) ThinSOTTM Package Gain Bandwidth product: 1.25MHz Slew Rate: 0.42V/s Low Input Offset Voltage: 800V Max Single Supply Input Range: 0V to 18V High Output Current: 18mA Min Specified on 3V, 5V and 5V Supplies Output Shutdown on 6-Lead Version Reverse Battery Protection to 18V High Voltage Gain: 1500V/mV
The LT(R)1783 is a 1.25MHz op amp available in the small SOT-23 package that operates on all single and split supplies with a total voltage of 2.5V to 18V. The amplifier draws less than 300A of quiescent current and has reverse battery protection, drawing negligible current for reverse supply voltages up to 18V. The input range of the LT1783 includes ground, and a unique feature of this device is its Over-The-TopTM operation capabilitity with either or both of its inputs above the positive rail. The inputs handle 18V both differential and common mode, independent of supply voltage. The input stage incorporates phase reversal protection to prevent false outputs from occurring even when the inputs are 9V below the negative supply. The LT1783 can drive loads up to 18mA and still maintain rail-to-rail capability. A shutdown feature on the 6-lead version can disable the part, making the output high impedance and reducing quiescent current to 5A. The LT1783 op amp is available in the 5- and 6-lead SOT-23 packages. For applications requiring lower power, refer to the LT1782.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT and Over-The-Top are trademarks of Linear Technology Corporation.
APPLICATIO S
s s s s s s s
Portable Instrumentation Battery- or Solar-Powered Systems Sensor Conditioning Supply Current Sensing Battery Monitoring MUX Amplifiers 4mA to 20mA Transmitters
TYPICAL APPLICATIO
V+ 5V TO 18V 200 5V 0.2 200
Distribution of Input Offset Voltage Positive Supply Rail Current Sense
PERCENTAGE OF AMPLIFIERS
25 VS = 5V, 0V VCM = 2.5V 20
15
+
LT1783 2N3904 VOUT = 2(ILOAD) 0V TO 4.3V 2k
1783 TA01
10
-
5
LOAD
ILOAD
0 -900
-600 -300 0 300 600 INPUT OFFSET VOLTAGE (V)
U
900
1782 G25
U
U
1
LT1783
ABSOLUTE
AXI U
RATI GS
Total Supply Voltage (V + to V -) .............................. 18V Input Differential Voltage ........................................ 18V Input Pin Voltage to V - ............................... + 24V/- 10V Shutdown Pin Voltage Above V - ............................ 18V Shutdown Pin Current ....................................... 10mA Output Short-Circuit Duration (Note 2) ........... Indefinite Operating Temperature Range (Note 3) LT1783C ............................................ - 40C to 85C LT1783I ............................................. - 40C to 85C LT1783H ......................................... - 40C to 125C
PACKAGE/ORDER I FOR ATIO
TOP VIEW OUT 1 V- 2 +IN 3
+-
ORDER PART NUMBER
TOP VIEW
5V
+
4 -IN
LT1783CS5 LT1783IS5 LT1783HS5 S5 PART MARKING LTLF LTLG LTXR
S5 PACKAGE 5-LEAD PLASTIC SOT-23
TJMAX = 150C, JA = 250C/ W
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. (Note 4)
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS TA = 25C 0C TA 70C -40C TA 85C
q q q
Input Offset Voltage Drift (Note 9) IOS IB Input Offset Current VCM = 18V (Note 5) Input Bias Current VCM = 18V (Note 5) SHDN or VS = 0V, VCM = 0V to 18V Input Bias Current Drift Input Noise Voltage en in Input Noise Voltage Density Input Noise Current Density 0.1Hz to 10Hz f = 1kHz f = 1kHz
2
U
U
W
WW U
W
(Note 1)
Specified Temperature Range (Note 4) LT1783C ............................................ - 40C to 85C LT1783I ............................................. - 40C to 85C LT1783H ......................................... - 40C to 125C Junction Temperature........................................... 150C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
ORDER PART NUMBER
OUT 1 V- 2 +IN 3
+-
+ 6V
5 SHDN 4 -IN
LT1783CS6 LT1783IS6 LT1783HS6 S6 PART MARKING LTIU LTIV LTXS
S6 PACKAGE 6-LEAD PLASTIC SOT-23
TJMAX = 150C, JA = 230C/ W
LT1783C/LT1783I MIN TYP MAX 400 800 950 1100 5 8 7 80 60
UNITS V V V V/C nA A nA A nA nA/C VP-P nV/Hz pA/Hz
2 4 45 35 0.1 0.06 0.6 20 0.14
q q q q q
LT1783
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. (Note 4)
SYMBOL PARAMETER RIN Input Resistance CONDITIONS Differential Common Mode, VCM = 0V to (VCC - 1V) Common Mode, VCM = 0V to 18V
q q
LT1783C/LT1783I MIN TYP MAX 0.65 0.3 0 90 68 90 200 133 100 400 250 200 100 80 100 1500 1.3 1 0.5 5
q
UNITS M G M pF
CIN CMRR PSRR AVOL
Input Capacitance Input Voltage Range Common Mode Rejection Ratio (Note 5) Power Supply Rejection Ratio Large-Signal Voltage Gain VCM = 0V to VCC - 1V VCM = 0V to 18V (Note 8) VS = 3V to 12.5V, VCM = VO = 1V VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0C TA 70C VS = 3V, - 40C TA 85C VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0C TA 70C VS = 5V, - 40C TA 85C
q q q q q q q q q q q q q q
18
V dB dB dB V/mV V/mV V/mV V/mV V/mV V/mV
1500
VOL
Output Voltage Swing LOW
No Load ISINK = 5mA VS = 5V, ISINK = 10mA VS = 3V, No Load VS = 3V, ISOURCE = 5mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA
3 200 330 2.91 2.6 4.91 4.5 5 15 15 20 2.94 2.8 4.94 4.74 10 30 30 40 2.5 18 210
8 400 600
mV mV mV V V V V mA mA mA mA
VOH
Output Voltage Swing HIGH
ISC
Short-Circuit Current (Note 2)
VS = 3V, Short to GND VS = 3V, Short to VCC VS = 5V, Short to GND VS = 5V, Short to VCC
Minimum Supply Voltage Reverse Supply Voltage IS Supply Current (Note 6) Supply Current, SHDN ISHDN Shutdown Pin Current IS = -100A 0C TA 70C - 40C TA 85C VPIN5 = 2V, No Load (Note 10) VPIN5 = 0.3V, No Load (Note 10) VPIN5 = 2V, No Load (Note 10) VPIN5 = 5V, No Load (Note 10) VPIN5 = 2V, No Load (Note 10) VPIN5 = 18V, No Load (Note 10) (Note 10) (Note 10) VPIN5 = 5V to 0V, RL = 10k (Note 10) VPIN5 = 0V to 5V, RL = 10k (Note 10) f = 5kHz 0C TA 70C - 40C TA 85C
q q q q q q q q q q q
2.7 300 350 375 18 8 1 30 0.3
V V A A A A nA A A A A V V s s kHz kHz kHz
5 0.5 2 5 0.05 10 2 25 3 750 600 550 1250
Shutdown Output Leakage Current Maximum Shutdown Pin Current VL VH tON tOFF GBW Shutdown Pin Input Low Voltage Shutdown Pin Input High Voltage Turn-On Time Turn-Off Time Gain Bandwidth Product (Note 5)
q q
3
LT1783
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. (Note 4)
SYMBOL PARAMETER SR Slew Rate (Note 7) Full-Power Bandwidth (Note 11) Settling Time Distortion CONDITIONS AV = -1, RL = 0C TA 70C - 40C TA 85C VOUT = 2VP-P VS = 5V, VOUT = 2V to 0.1%, AV = -1 VS = 3V, VO = 2VP-P, AV = 1, RL = 10k, f = 1kHz
q q
LT1783C/LT1783I MIN TYP MAX 0.24 0.21 0.019 0.42
UNITS V/s V/s V/s kHz s %
FPBW tS THD
66 12 0.001
The q denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25C. VS = 5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V-, pulse power tested unless otherwise specified. (Note 4)
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS TA = 25C 0C TA 70C - 40C TA 85C
q q q q q q
LT1783C/LT1783I MIN TYP MAX 500 900 1050 1200 5 8 80
UNITS V V V V/C nA nA nA/C VP-P nV/Hz pA/Hz M M pF
Input Offset Voltage Drift (Note 9) IOS IB Input Offset Current Input Bias Current Input Bias Current Drift Input Noise Voltage en in RIN CIN CMRR AVOL Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Large-Signal Voltage Gain VCM = -5V to 13V VO = 4V, RL= 10k 0C TA 70C -40C TA 85C No Load ISINK = 5mA ISINK = 10mA No Load ISOURCE = 5mA ISOURCE = 10mA Short to GND 0C TA 70C VS = 1.5V to 9V 0C TA 70C -40C TA 85C Supply Current, SHDN ISHDN Shutdown Pin Current VPIN5 = -3V, VS = 5V, No Load (Note 10) VPIN5 = -4.7V, VS = 5V, No Load (Note 10) VPIN5 = -3V, VS = 5V, No Load (Note 10) 0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = -5V to 13V
2 4 40 0.06 1 20 0.14
q q
0.65 0.3 -5 68 70 50 40
1.3 0.5 5 13 80 160
q q q q q q q q q q q q q q q q q
V dB V/mV V/mV V/mV
VOL
Output Voltage Swing LOW
-4.997 -4.8 -4.67 4.91 4.6 4.5 18 15 90 4.94 4.8 4.74 30 100 230
-4.992 -4.6 -4.4
V V V V V V mA mA dB
VOH
Output Voltage Swing HIGH
ISC PSRR IS
Short-Circuit Current (Note 2) Power Supply Rejection Ratio Supply Current
325 375 400 20 8
A A A A nA A
6 0.5 2
4
LT1783
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25C. VS = 5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V-, pulse power tested unless otherwise specified. (Note 4)
SYMBOL PARAMETER Maximum Shutdown Pin Current Shutdown Output Leakage Current VL VH tON tOFF GBW Shutdown Pin Input Low Voltage Shutdown Pin Input High Voltage Turn-On Time Turn-Off Time Gain Bandwidth Product CONDITIONS VPIN5 = 9V, VS = 9V (Note 10) VPIN5 = -7V, VS = 9V, No Load (Note 10) VS = 5V (Note 10) VS = 5V (Note 10) VPIN5 = 0V to -5V, RL = 10k (Note 10) VPIN5 = -5V to 0V, RL = 10k (Note 10) f = 5kHz 0C TA 70C -40C TA 85C AV = -1, RL = , VO = 4V, Measured at VO = 2V 0C TA 70C -40C TA 85C VOUT = 8VP-P VOUT = 4V to 0.1%, AV = 1
q q q q q q q q q q
LT1783C/LT1783I MIN TYP MAX 10 0.05 -2.8 25 3 800 700 625 0.26 0.23 0.21 1300 30 1 -4.7
UNITS A A V V s s kHz kHz kHz V/s V/s V/s kHz s
SR
Slew Rate
0.45
FPBW tS
Full-Power Bandwidth (Note 11) Settling Time
18 10
The q denotes specifications which apply over the full operating temperature range of -40C TA 125C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. (Note 4)
SYMBOL PARAMETER VOS Input Offset Voltage
q
CONDITIONS
MIN
LT1783H TYP 400
MAX 850 3 15 15 10 150 150
UNITS V mV V/C nA A nA A V dB dB
Input Offset Voltage Drift (Note 9) IOS IB Input Offset Current VCM = 18V (Note 5) Input Bias Current VCM = 18V (Note 5) Input Voltage Range CMRR AVOL Common Mode Rejection Ratio Large-Signal Voltage Gain VCM = 0.3V to VCC - 1V VCM = 0.3V to 18V VS = 3V, VO = 500mV to 2.5V, RL = 10k
q q q q q q q q q
0.3 76 60 200 50 400 100 1500 1500
18
V/mV V/mV V/mV V/mV 15 800 1200 mV mV mV V V V V dB V V
VS = 5V, VO = 500mV to 4.5V, RL = 10k
q
VOL
Output Voltage Swing LOW
No Load ISINK = 5mA VS = 5V, ISINK = 10mA VS = 3V, No Load VS = 3V, ISOURCE = 5mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA
q q q q q q q q q
VOH
Output Voltage Swing HIGH
2.85 2.30 4.85 4 80 2.7 18
PSRR
Power Supply Rejection Ratio Minimum Supply Voltage Reverse Supply Voltage
VS = 3V to 12.5V, VCM = VO = 1V IS = -100A
q
5
LT1783
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER IS Supply Current CONDITIONS
The q denotes specifications which apply over the full operating temperature range of -40C TA 125C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. (Note 4)
MIN
q
LT1783H TYP 210
MAX 300 600 25
UNITS A A A nA A A A kHz kHz V/s V/s
Supply Current, SHDN ISHDN Shutdown Pin Current Output Leakage Current Maximum Shutdown Pin Current GBW SR Gain Bandwidth Product Slew Rate
VPIN5 = 2V, No Load (Note 10) VPIN5 = 0.3V, No Load (Note 10) VPIN5 = 2V, No Load (Note 10) VPIN5 = 2V, No Load (Note 10) VPIN5 = 18V, No Load (Note 10) f = 5kHz (Note 5)
q q q q q q
0.5 12 2.5 40 750 400 0.24 0.12 1250 0.42
AV = -1, RL = (Note 7)
q
The q denotes specifications which apply over the full operating temperature range of -40C TA 125C. VS = 5V, VCM = 0V, VOUT = 0V, VSHDN = V -, TA = - 40C to 125C, for the 6-lead part VPIN5 = V -, pulse power tested unless otherwise specified. (Note 4)
SYMBOL PARAMETER VOS Input Offset Voltage
q
CONDITIONS
MIN
LT1783H TYP 500
MAX 950 3.1 15 15 150
UNITS V mV V/C nA nA dB V/mV V/mV V V V dB V
Input Offset Voltage Drift (Note 9) IOS IB CMRR AVOL VO Input Offset Current Input Bias Current Common Mode Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing VCM = -4.7V to 13V VO = 4V, RL = 10k
q q q q q
60 70 10 4.85 4.20 3.80 80 1.35 230 325 650 25 0.5 12 45 3 -4.7 - 2.8 800 425 0.26 0.14 1300 0.45 160
No Load IOUT = 5mA IOUT = 10mA VS = 1.5V to 9V
q q q q q q
PSRR IS
Power Supply Rejection Ratio Minimum Supply Voltage Supply Current Supply Current, SHDN
A A A nA A A A V V kHz kHz V/s V/s
VPIN5 = - 3V, VS = 5V, No Load (Note 10) VPIN5 = - 4.7V, VS = 5V, No Load (Note 10) VPIN5 = - 3V, VS = 5V, No Load (Note 10) VPIN5 = 9V, VS = 9V (Note 10) VPIN5 = - 7V, VS = 9V, No Load VS = 5V VS = 5V f = 5kHz
q q q q q q q q
ISHDN
Shutdown Pin Current Maximum Shutdown Pin Current Output Leakage Current
VL VH GBW SR
Shutdown Pin Input Low Voltage Shutdown Pin Input High Voltage Gain Bandwidth Product Slew Rate
AV = -1, RL = , VO = 4V Measured at VO = 2V
q
6
LT1783
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. Note 3: The LT1783C and LT1873I are guaranteed functional over the operating temperature range of - 40C to 85C. The LT1783H is guaranteed functional over the operating temperature range of - 40C to 125C. Note 4: The LT1783C is guaranteed to meet specified performance from 0C to 70C. The LT1783C is designed, characterized and expected to meet specified performance from - 40C to 85C but is not tested or QA sampled at these temperatures. The LT1783I is guaranteed to meet specified performance from - 40C to 85C. The LT1783H is guaranteed to meet specified performance from - 40C to 125C. Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = 5V or VS = 9V tests. Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = 5V or VS = 9V tests. Note 7: Guaranteed by correlation to slew rate at VS = 5V, and GBW at VS = 3V and VS = 5V tests. Note 8: This specification implies a typical input offset voltage of 1.8mV at VCM = 18V and a maximum input offset voltage of 7.2mV at VCM = 18V. Note 9: This parameter is not 100% tested. Note 10: Specifications apply to 6-lead SOT-23 with shutdown. Note 11: Full-power bandwidth is calculated from the slew rate. FPBW = SR/2VP.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
300 280 SUPPLY CURRENT (A) 260 240 220 200 180 160 140 120 2 4 6 8 10 12 14 SUPPLY VOLTAGE (V) 16 18 TA = -55C TA = 25C TA = 125C 400
INPUT OFFSET VOLTAGE CHANGE (V)
0 TA = 125C -100 -200 -300 -400 0 1 2 3 4 TOTAL SUPPLY VOLTAGE (V) 5
1783 G02
VOUT (V)
Input Bias Current vs Common Mode Voltage
50000
OUTPUT SATURATION VOLTAGE (V)
40000 30000
INPUT BIAS CURRENT (nA)
OUTPUT SATURATION VOLTAGE (V)
20000 10000 250 200 150 100 50 0 TA = 125C TA = -55C TA = 25C
-50 3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 14 16 18 COMMON MODE VOLTAGE (V)
1783 G03
UW
1783 G01
Minimum Supply Voltage
5 300 200 100 TA = -55C 4
Output Voltage vs Large Input Voltage
VS = 5V, 0V
3 5V VIN 1 + -
2
TA = 25C
0 -10-8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 VIN (V)
1783 G02a
Output Saturation Voltage vs Load Current (Output High)
1 VS = 2.5V VOD = 30mV
Output Saturation Voltage vs Load Current (Output Low)
1 VS = 2.5V VOD = 30mV TA = 125C
0.1
TA = 125C 0.1
TA = -55C TA = 25C
0.01
TA = 25C
TA = -55C
0.01 1 10 100 1m SOURCING LOAD CURRENT (A) 10m
1783 G04
0.001 1 10 100 1m SINKING LOAD CURRENT (A) 10m
1783 G05
7
LT1783 TYPICAL PERFOR A CE CHARACTERISTICS
Output Saturation Voltage vs Input Overdrive
100
OUTPUT SATURATION VOLTAGE (mV) 55
OUTPUT HIGH
50 OUTPUT CURRENT (mA)
45
SOURCING CURRENT
10
40
SINKING CURRENT
OUTPUT LOW VS = 2.5V NO LOAD 1 0 10 20 30 40 50 INPUT OVERDRIVE (mV) 60
1783 G06
35
30 -50
NOISE VOLTAGE (400nV/DIV)
Noise Voltage Density vs Frequency
70 3.0
INPUT NOISE CURRENT DENSITY (pA/Hz)
INPUT NOISE VOLTAGE DENSITY (nV/Hz)
VS = 2.5V 60 50 40 30 20 10
GAIN (dB)
1
10
100 1k FREQUENCY (Hz)
Gain Bandwidth Product vs Temperature
1400 1350
GAIN BANDWIDTH (kHz)
f = 5kHz VS = 2.5V SLEW RATE (V/s)
1300 1250 1200 1150 1100 -50
-25
0 25 50 75 TEMPERATURE (C)
8
UW
1783 G08
Output Short-Circuit Current vs Temperature
VS = 5V
0.1Hz to 10Hz Noise Voltage
VS = 2.5V
-25
0 25 50 75 TEMPERATURE (C)
100
125
0
1
2
3
456 TIME (sec)
7
8
9
10
1783 G06a
1783 G07
Input Noise Current vs Frequency
70 VS = 2.5V 2.5 2.0 1.5 1.0 0.5 0 60 50 40 30 20 10 0 -10 -20 -30 1 10 100 1k FREQUENCY (Hz) 10k
1783 G09
Gain and Phase Shift vs Frequency
120 VS = 2.5V PHASE 100 80 60 40 20 GAIN 0 -20 -40 -60 1k 10k 100k 1M FREQUENCY (Hz) -80 10M
1783 G10
PHASE SHIFT (DEG)
10k
Slew Rate vs Temperature
0.8 VS = 5V 0.7 0.6 0.5 0.4 0.3 0.2 -50 FALLING RISING
100
125
-25
0 25 50 75 TEMPERATURE (C)
100
125
1783 G11
1783 G12
LT1783 TYPICAL PERFOR A CE CHARACTERISTICS
Gain Bandwidth Product and Phase Margin vs Supply Voltage
65
AV = -1 RF = RG = 10k f = 5kHz PHASE MARGIN
GAIN BAINDWIDTH PRODUCT (kHz)
GAIN BAINDWIDTH PRODUCT (kHz)
1300
1250
GAIN BANDWIDTH PRODUCT
1200 0 2 4 6 8 10 12 14 16 TOTAL SUPPLY VOLTAGE (V) 18
PSRR vs Frequency
90
POWER SUPPLY REJECTION RATIO (dB)
80 70 60 50 40 30 20 10 0 -10 1k
COMMON MODE REJECTION RATIO (dB)
VS = 2.5V
POSITIVE SUPPLY
80 70 60 50 40 30 10k 100k FREQUENCY (Hz) 1M
1783 G16
OUTPUT IMPEDANCE ()
NEGATIVE SUPPLY
10k 100k FREQUENCY (Hz)
Disabled Output Impedance vs Frequency (Note 8)
1M 4 3
OUTPUT IMPEDANCE ()
100k OUTPUT STEP (V)
OVERSHOOT (%)
10k
1k VS = 2.5V VPIN5 (SHUTDOWN) = 2.5V 100 100 1k 10k 100k FREQUENCY (Hz) 1M
1783 G17a
UW
1783 G15
Gain Bandwidth and Phase Margin vs Load Resistance
PHASE MARGIN (DEG)
65
PHASE MARGIN (DEG)
60
PHASE MARGIN
60 55
55
1400 1200 1000 800 1k
GAIN BANDWIDTH PRODUCT VS = 2.5V AV = -1 RF = RG = 10k f = 5kHz 10k LOAD RESISTANCE () 100k
1783 G14
1783 G13
CMRR vs Frequency
110 100 90 10 VS = 2.5V 100
Output Impedance vs Frequency
VS = 2.5V AV = 100
1
AV = 10
0.1 AV = 1 0.01 100
1M
1k
10k 100k FREQUENCY (Hz)
1M
1783 G17
Settling Time to 0.1% vs Output Step
40 35
Capacitive Load Handling Overshoot vs Capacitive Load
VS = 5V, 0V VCM = 2.5V
AV = 1 2 1 0 -1 -2 AV = 1 -3 -4 0 2 4 VS = 5V
AV = -1
30 25 20 15 10 AV = 1
AV = -1
5 0 10
AV = 5
AV = 10
6 8 10 12 14 16 18 20 SETTLING TIME (s)
1783 G18
100 1000 CAPACITIVE LOAD (pF)
10000
1783 G19
9
LT1783 TYPICAL PERFOR A CE CHARACTERISTICS
Undistorted Output Swing vs Frequency
12 10
OUTPUT SWING (VP-P)
VS = 5V
THD + NOISE (%)
THD + NOISE (%)
8 6 4 2 0 100 VS = 2.5V
DISTORTION 1% AV = 1
1k 10k FREQUENCY (Hz)
Total Harmonic Distortion + Noise vs Output Voltage Amplitude
INPUT OFFSET VOLTAGE CHANGE (50V/DIV)
10 AV = -1 RF = RG = 100k VS = 1.5V VCM = 0V AV = -1 RF = RG = 100k VS = 3V, 0V VCM = 1.5V AV = 1 VS = 3V, 0V VCM = 1.5V
SUPPLY CURRENT PER AMPLIFIER (A)
1
THD + NOISE (%)
0.1
0.01
AV = 1 VS = 1.5V VCM = 0V 3
0.001 0 1 2 OUTPUT VOLTAGE AMPLITUDE (VP-P)
Large-Signal Response
VS = 5V AV = 1 CL = 15pF
10
UW
1783 G20
Total Harmonic Distortion + Noise vs Frequency
1 VS = 3V, 0V VOUT = 2VP-P VCM = 1.2V RL = 10k 1
Total Harmonic Distortion + Noise vs Load Resistance
VS = 3V TOTAL AV = 1 VIN = 2VP-P AT 1kHz
0.1
0.1
VS = 1.5V VIN = 1V
0.010
AV = -1
0.01 VS = 3V, 0V VIN = 0.5V TO 2.5V 0.001 VS = 3V, 0V VIN = 0.2V TO 2.2V
0.001 AV = 1 0.0001
100k
10
100
1k 10k FREQUENCY (Hz)
100k
1783 G21
0.0001 100
1k 10k LOAD RESISTANCE TO GROUND ()
100k
1783 G22
Open-Loop Gain
VS = 5V RL = 2k RL = 10k RL = 50k
275 250 225 200 175 150 125 100 75 50 25 0
Supply Current vs SHDN Pin Voltage
VS = 5V, 0V
TA = 125C TA = 25C
TA = -55C
-6 -5 -4 -3 -2 -1 0 1 2 3 OUTPUT VOLTAGE (V)
4
5
6
0
0.5 1 1.5 2 SHUTDOWN PIN VOLTAGE (V)
2.5
1783 G25
1783 G23
1783 G24
Small-Signal Response
1783 G26
VS = 5V AV = 1 CL = 15pF
1783 G27
LT1783
APPLICATIO S I FOR ATIO
Supply Voltage
The positive supply pin of the LT1783 should be bypassed with a small capacitor (typically 0.1F) within an inch of the pin. When driving heavy loads, an additional 4.7F electrolytic capacitor should be used. When using split supplies, the same is true for the negative supply pin. The LT1783 is protected against reverse battery voltages up to 18V. In the event a reverse battery condition occurs, the supply current is less than 1nA. Inputs The LT1783 has two input stages, NPN and PNP (see the Simplified Schematic), resulting in three distinct operating regions as shown in the Input Bias Current vs Common Mode typical performance curve. For input voltages about 0.8V or more below V +, the PNP input stage is active and the input bias current is typically -40nA. When the input common mode voltage is within 0.5V of the positive rail, the NPN stage is operating and the input bias current is typically 80nA. Increases in temperature will cause the voltage at which operation switches from the PNP input stage to the NPN input stage to move towards V +. The input offset voltage of the NPN stage is untrimmed and is typically 1.8mV. A Schottky diode in the collector of the input transistors, along with special geometries for these NPN transistors, allow the LT1783 to operate with either or both of its inputs above V +. At about 0.3V above V +, the NPN input transistor is fully saturated and the input bias current is typically 30A at room temperature. The input offset voltage is typically 1.8mV when operating above V +. The LT1783 will operate with its inputs 18V above V - regardless of V +.
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The inputs are protected against excursions as much as 10V below V - by an internal 1k resistor in series with each input and a diode from the input to the negative supply. The input stage of the LT1783 incorporates phase reversal protection to prevent the output from phase reversing for inputs up to 9V below V -. There are no clamping diodes between the inputs and the maximum differential input voltage is 18V. Output The output of the LT1783 can swing to within 60mV of the positive rail with no load and within 3mV of the negative rail with no load. When monitoring input voltages within 60mV of the positive rail or within 3mV of the negative rail, gain should be taken to keep the output from clipping. The LT1783 can sink and source over 30mA at 5V supplies, sourcing current is reduced to 10mA at 3V total supplies as noted in the Electrical Characteristics. The LT1783 is internally compensated to drive at least 400pF of capacitance under any output loading conditions. A 0.22F capacitor in series with a 150 resistor between the output and ground will compensate these amplifiers for larger capacitive loads, up to 10,000pF, at all output currents. Distortion There are two main contributors to distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current, and distortion caused by nonlinear common mode rejection. If the op amp is operating inverting, there is no common mode induced distortion. If the op amp is operating in the PNP input stage (input is not within 0.8V of V +), the CMRR is very good,
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LT1783
APPLICATIO S I FOR ATIO
typically 100dB. When the LT1783 switches between input stages, there is significant nonlinearity in the CMRR. Lower load resistance increases the output crossover distortion but has no effect on the input stage transition distortion. For lowest distortion, the LT1783 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V + - 0.8V). See the Typical Performance Characteristics curves, "Total Harmonic Distortion + Noise vs Output Voltage Amplitude." Gain The open-loop gain is almost independent of load when the output is sourcing current. This optimizes perfor-
SI PLIFIED SCHE ATIC
V+ Q1 D1 SHDN R1 6k Q4 J1 - IN Q17 10A +IN Q26 Q9 Q10 Q13 Q14 R3 1k Q7 Q8 Q11 Q12 Q16 Q15 Q21 Q18 Q20 OUT R2 1k Q2 D3 Q3 Q22
+
Q25 Q23
Q24
Q5
Q6
D4
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mance in single supply applications where the load is returned to ground. The typical performance curve of open-loop gain for various loads shows the details. Shutdown The 6-lead part includes a shutdown feature that disables the part, reducing quiescent current and making the output high impedance. The part can be shut down by bringing the SHDN pin 1.2V or more above V -. When shut down, the supply current is about 5A and the output leakage current is less than 1A (V - VOUT V +). In normal operation, the SHDN pin can be tied to V - or left floating. See the Typical Performance Characteristics curves, "Supply Current vs Shutdown Voltage."
Q19 D5 R4 8k R5 8k V-
1783 SS
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LT1783
TYPICAL APPLICATIO U
Protected Fault Conditions
OK! -18V V+ LT1783 OK! 5V V+ LT1783 24V
+
REVERSE BATTERY
INPUT OVERVOLTAGE
OK!
5V
OK!
5V
18V
+
LT1783
LT1783
INPUT DIFFERENTIAL VOLTAGE
INPUTS BELOW GROUND
1783 TA03
+
10V
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LT1783
PACKAGE DESCRIPTIO
A A1 A2 L
SOT-23 (Original) .90 - 1.45 (.035 - .057) .00 - .15 (.00 - .006) .90 - 1.30 (.035 - .051) .35 - .55 (.014 - .021)
SOT-23 (ThinSOT) 1.00 MAX (.039 MAX) .01 - .10 (.0004 - .004) .80 - .90 (.031 - .035) .30 - .50 REF (.012 - .019 REF) PIN ONE .95 (.037) REF .25 - .50 (.010 - .020) (5PLCS, NOTE 2) 2.60 - 3.00 (.102 - .118) 1.50 - 1.75 (.059 - .069) (NOTE 3)
.20 (.008) DATUM `A' A A2
L NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES)
3. DRAWING NOT TO SCALE 4. DIMENSIONS ARE INCLUSIVE OF PLATING 5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 6. MOLD FLASH SHALL NOT EXCEED .254mm 7. PACKAGE EIAJ REFERENCE IS: SC-74A (EIAJ) FOR ORIGINAL JEDEL MO-193 FOR THIN
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S5 Package 5-Lead Plastic SOT-23
(Reference LTC DWG # 05-08-1633) (Reference LTC DWG # 05-08-1635)
2.80 - 3.10 (.110 - .118) (NOTE 3) .09 - .20 (.004 - .008) (NOTE 2) 1.90 (.074) REF A1
S5 SOT-23 0401
LT1783
PACKAGE DESCRIPTIO
SOT-23 (Original) A A1 A2 L .90 - 1.45 (.035 - .057) .00 - 0.15 (.00 - .006) .90 - 1.30 (.035 - .051) .35 - .55 (.014 - .021)
SOT-23 (ThinSOT) 1.00 MAX (.039 MAX) .01 - .10 (.0004 - .004) .80 - .90 (.031 - .035) .30 - .50 REF (.012 - .019 REF) 2.60 - 3.00 (.102 - .118) 1.50 - 1.75 (.059 - .069) (NOTE 3) PIN ONE ID
.20 (.008) DATUM `A' A A2
L NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES)
3. DRAWING NOT TO SCALE 4. DIMENSIONS ARE INCLUSIVE OF PLATING 5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 6. MOLD FLASH SHALL NOT EXCEED .254mm 7. PACKAGE EIAJ REFERENCE IS: SC-74A (EIAJ) FOR ORIGINAL JEDEL MO-193 FOR THIN
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 SOT-23
(Reference LTC DWG # 05-08-1634) (Reference LTC DWG # 05-08-1636)
2.80 - 3.10 (.110 - .118) (NOTE 3) .95 (.037) REF .25 - .50 (.010 - .020) (6PLCS, NOTE 2) .09 - .20 (.004 - .008) (NOTE 2) 1.90 (.074) REF A1
S6 SOT-23 0401
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LT1783
TYPICAL APPLICATIO
RELATED PARTS
PART NUMBER LT1782 LT1490/LT1491 LT1636 LT1638/LT1639 DESCRIPTION Micropower, Over-The-Top SOT-23 Rail-to-Rail Input and Output Op Amp Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp Dual/Quad, 1.2MHz, 0.4V/s, Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps COMMENTS SOT-23 Package, Micropower 40A per Amplifier, Rail-to-Rail Input and Output , 200kHz GBW Single Supply Input Range: -0.4V to 44V, Micropower 50A per Amplifier, Rail-to-Rail Input and Output , 200kHz GBW 55A Supply Current, VCM Extends 44V Above VEE, Independent of VCC, MSOP Package, Shutdown Function 170A Supply Current, Single Supply Input Range: -0.4V to 44V, Rail-to-Rail Input and Output
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
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Current Source
VCC LT1634-1.25 R1
+
LT1783 2N3906 1.25V R1
1783 TA02
-
IOUT =
1783FA LT/TP 0501 2K REV A * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1999

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