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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 Small SOT-23 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 Operating Temperature Range: - 40C to 85C
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. Over-The-Top is a trademark of Linear Technology Corporation.
APPLICATIO S
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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
25 VS = 5V, 0V VCM = 2.5V
Positive Supply Rail Current Sense
PERCENTAGE OF AMPLIFIERS
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)
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900
1782 G25
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1
LT1783
ABSOLUTE MAXIMUM RATINGS
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
PACKAGE/ORDER INFORMATION
TOP VIEW OUT 1 V- 2 +IN 3
+-
5V
+
ORDER PART NUMBER LT1783CS5 S5 PART MARKING LTLF
4 -IN
S5 PACKAGE 5-LEAD PLASTIC SOT-23
TJMAX = 150C, JA = 250C/ W
Consult factory for Industrial and Military grade parts.
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.
SYMBOL PARAMETER VOS Input Offset Voltage Input Offset Voltage Drift (Note 7) IOS IB Input Offset Current VCM = 18V (Note 3) Input Bias Current VCM = 18V (Note 3) SHDN or VS = 0V, VCM = 0V to 18V Input Bias Current Drift Input Noise Voltage en in RIN Input Noise Voltage Density Input Noise Current Density Input Resistance 0C TA 70C 0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = 0V to (VCC - 1V) Common Mode, VCM = 0V to 18V
q
CONDITIONS TA = 25C 0C TA 70C 0C TA 70C
q q q q q q q
CIN CMRR PSRR AVOL
Input Capacitance Input Voltage Range Common Mode Rejection Ratio (Note 3) Power Supply Rejection Ratio Large-Signal Voltage Gain VCM = 0V to VCC - 1V VCM = 0V to 18V (Note 6) VS = 3V to 12.5V, VCM = VO = 1V VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0C TA 70C VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0C TA 70C 0 90 68 90 200 133 400 250
q q q q q
2
U
U
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(Note 1)
Operating Temperature Range (Note 10) - 40C to 85C Specified Temperature Range ...................... 0C to 70C Junction Temperature........................................... 150C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
TOP VIEW OUT 1 V- 2 +IN 3
+-
+ 6V
ORDER PART NUMBER LT1783CS6 S6 PART MARKING LTIU
5 SHDN 4 -IN
S6 PACKAGE 6-LEAD PLASTIC SOT-23
TJMAX = 150C, JA = 230C/ W
MIN
TYP 400 2 4 45 35 0.1 0.06 0.6 20 0.14
MAX 800 950 5 8 7 80 60
UNITS V V V/C nA A nA A nA nA/C VP-P nV/Hz pA/Hz M G M pF
0.65 0.3
1.3 1 0.5 5 18 100 80 100 1500 1500
V dB dB dB V/mV V/mV V/mV V/mV
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.
SYMBOL PARAMETER VOL Output Voltage Swing LOW CONDITIONS No Load ISINK = 5mA VS = 5V, ISINK = 10mA VS = 3V, No Load VS = 3V, ISOURCE = 5mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA 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 4) Supply Current, SHDN ISHDN Shutdown Pin Current VPIN5 = 2V, No Load (Note 8) VPIN5 = 0.3V, No load (Note 8) VPIN5 = 2V, No Load (Note 8) VPIN5 = 5V, No Load (Note 8) VPIN5 = 2V, No Load (Note 8) VPIN5 = 18V, No Load (Note 8) (Note 8) (Note 8) VPIN5 = 5V to 0V, RL = 10k (Note 8) VPIN5 = 0V to 5V, RL = 10k (Note 8) f = 5kHz 0C TA 70C AV = -1, RL = 0C TA 70C 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 q q q q q q q q
MIN
TYP 3 200 330
MAX 8 400 600
UNITS mV mV mV V V V V mA mA mA mA
VOH
Output Voltage Swing HIGH
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 2.7 300 350 18 8 1 30 0.3
V V A A A nA A A A A V V s s kHz kHz V/s V/s kHz s %
IS = -100A
q q q q q q q q q
18 210 5 0.5 2 5 0.05 10 2 25 3 750 600 0.24 0.21 1250 0.42 66 12 0.001
Shutdown Output Leakage Current Maximum Shutdown Pin Current VL VH tON tOFF GBW SR FPBW tS THD Shutdown Pin Input Low Voltage Shutdown Pin Input High Voltage Turn-On Time Turn-Off Time Gain Bandwidth Product (Note 3) Slew Rate (Note 5) Full-Power Bandwidth (Note 9) Settling Time Distortion
VS = 5V, VCM = 0V,VOUT = 0V, for the 6-lead part VSHDN = V-
VOS Input Offset Voltage Input Offset Voltage Drift (Note 7) IOS IB Input Offset Current Input Bias Current Input Bias Current Drift Input Noise Voltage en in Input Noise Voltage Density Input Noise Current Density 0C TA 70C 0.1Hz to 10Hz f = 1kHz f = 1kHz TA = 25C 0C TA 70C 0C TA 70C 500
q q q q q
900 1050 5 8 80
V V V/C nA nA nA/C VP-P nV/Hz pA/Hz
2 4 40 0.06 1 20 0.14
3
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 VSHDN = V-, unless otherwise specified.
SYMBOL PARAMETER RIN CIN CMRR AVOL VOL Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing LOW VCM = -5V to 13V VO = 4V, RL= 10k 0C TA 70C No Load ISINK = 5mA ISINK = 10mA No Load ISOURCE = 5mA ISOURCE = 10mA Short to GND 0C TA 70C VS = 1.5V to 9V
q q q q q q q q q q q q
CONDITIONS Differential Common Mode, VCM = -5V to 13V
q q
MIN 0.65 0.3 -5 68 70 50
TYP 1.3 0.5 5
MAX
UNITS M M pF
13 80 160 -4.997 -4.8 -4.67 -4.992 -4.6 -4.4
V dB V/mV V/mV V V V V V V mA mA dB
VOH
Output Voltage Swing HIGH
4.91 4.6 4.5 18 15 90
4.94 4.8 4.74 30 100 230 325 375 20 8 30 1 -4.7
ISC PSRR IS
Short-Circuit Current (Note 2) Power Supply Rejection Ratio Supply Current Supply Current, SHDN
A A A nA A A A V V s s kHz kHz V/s V/s kHz s
VPIN5 = -3V, VS = 5V, No Load (Note 8) VPIN5 = -4.7V, VS = 5V, No load (Note 8) VPIN5 = -3V, VS = 5V, No Load (Note 8) VPIN5 = 9V, VS = 9V (Note 8) VPIN5 = -7V, VS = 9V, No Load (Note 8) VS = 5V (Note 8) VS = 5V (Note 8) VPIN5 = 0V to -5V, RL = 10k (Note 8) VPIN5 = -5V to 0V, RL = 10k (Note 8) f = 5kHz 0C TA 70C AV = -1, RL = , VO = 4V, Measured at VO = 2V 0C TA 70C VOUT = 8VP-P VOUT = 4V to 0.1%, AV = 1
q q q q q q q q q q q
6 0.5 2 10 0.05 -2.8 25 3 800 700 0.26 0.23 1300 0.45 18 10
ISHDN
Shutdown Pin Current Maximum Shutdown Pin Current Shutdown Output Leakage Current
VL VH tON tOFF GBW SR FPBW tS
Shutdown Pin Input Low Voltage Shutdown Pin Input High Voltage Turn-On Time Turn-Off Time Gain Bandwidth Product Slew Rate Full-Power Bandwidth (Note 9) Settling Time
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: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = 5V or VS = 9V tests. Note 4: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = 5V or VS = 9V tests. Note 5: Guaranteed by correlation to slew rate at VS = 5V, and GBW at VS = 3V and VS = 5V tests.
Note 6: 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 7: This parameter is not 100% tested. Note 8: Specifications apply to 6-lead SOT-23 with shutdown. Note 9: Full-power bandwidth is calculated from the slew rate. FPBW = SR/2VP. Note 10: The LT1783 is guaranteed functional over the operating temperature range - 40C to 85C.
4
LT1783 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
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)
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
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
5
LT1783 TYPICAL PERFOR A CE CHARACTERISTICS
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)
Gain Bandwidth Product and Phase Margin vs Supply Voltage
65
PHASE MARGIN (DEG)
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
6
UW
10k
1783 G08
Input Noise Current vs Frequency
70
VS = 2.5V 2.5 2.0 1.5 1.0 0.5 0
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
60 50 40 30 20 10 0 -10 -20 -30
PHASE SHIFT (DEG)
1
10
100 1k FREQUENCY (Hz)
10k
1783 G09
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
Gain Bandwidth and Phase Margin vs Load Resistance
PHASE MARGIN (DEG) 65 PHASE MARGIN 60 55
60
55
1400 1200 1000 800 1k 10k LOAD RESISTANCE () 100k
1783 G14
GAIN BANDWIDTH PRODUCT VS = 2.5V AV = -1 RF = RG = 10k f = 5kHz
1783 G13
LT1783 TYPICAL PERFOR A CE CHARACTERISTICS
PSRR vs Frequency
90 POWER SUPPLY REJECTION RATIO (dB) 80 70 60 50 40 30 20 10 0 -10 1k 10k 100k FREQUENCY (Hz) 1M
1783 G15
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
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
Undistorted Output Swing vs Frequency
12 10
OUTPUT SWING (VP-P) 1
VS = 5V
0.1 THD + NOISE (%)
THD + NOISE (%)
8 6 4 2 0 100 VS = 2.5V
DISTORTION 1% AV = 1
0.0001
1k 10k FREQUENCY (Hz)
UW
1783 G20
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
1k
10k 100k FREQUENCY (Hz)
1M
1783 G17
Settling Time to 0.1% vs Output Step
40 35
AV = 1 2 1 0 -1 -2 AV = 1 -3 -4 0 2 4 6 8 10 12 14 16 18 20 SETTLING TIME (s)
1783 G18
Capacitive Load Handling Overshoot vs Capacitive Load
VS = 5V, 0V VCM = 2.5V
AV = -1
30 25 20 15 10 AV = 1
VS = 5V
AV = -1
5 0 10
AV = 5
AV = 10
100 1000 CAPACITIVE LOAD (pF)
10000
1783 G19
Total Harmonic Distortion + Noise vs Frequency
1
VS = 3V, 0V VOUT = 2VP-P VCM = 1.2V RL = 10k
Total Harmonic Distortion + Noise vs Load Resistance
VS = 3V TOTAL AV = 1 VIN = 2VP-P AT 1kHz
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
100k
10
100
1k 10k FREQUENCY (Hz)
100k
1783 G21
0.0001 100
1k 10k LOAD RESISTANCE TO GROUND ()
100k
1783 G22
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LT1783 TYPICAL PERFOR A CE CHARACTERISTICS
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
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.
8
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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
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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
LT1783
APPLICATIO S I FOR ATIO
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 +. 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.
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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, 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 performance 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."
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LT1783
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
PACKAGE DESCRIPTIO
0.35 - 0.55 (0.014 - 0.022)
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
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Q19
Q6
D4
D5
R4 8k
R5 8k V-
1783 SS
Dimensions in inches (millimeters) unless otherwise noted.
S5 Package 5-Lead Plastic SOT-23
(LTC DWG # 05-08-1633)
2.80 - 3.00 (0.110 - 0.118) (NOTE 3)
2.60 - 3.00 (0.102 - 0.118) 1.50 - 1.75 (0.059 - 0.069)
1.90 (0.074) REF 0.00 - 0.15 (0.00 - 0.006)
0.95 (0.037) REF
0.90 - 1.45 (0.035 - 0.057)
0.09 - 0.20 (0.004 - 0.008) (NOTE 2)
0.35 - 0.50 0.90 - 1.30 (0.014 - 0.020) (0.035 - 0.051) FIVE PLACES (NOTE 2) S5 SOT-23 0599
LT1783
PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted.
S6 Package 6-Lead Plastic SOT-23
(LTC DWG # 05-08-1634)
2.80 - 3.00 (0.110 - 0.118) (NOTE 3)
PIN 1 1.90 (0.074) REF 0.00 - 0.15 (0.00 - 0.006) 0.95 (0.037) REF
2.6 - 3.0 (0.110 - 0.118) 1.50 - 1.75 (0.059 - 0.069)
0.90 - 1.45 (0.035 - 0.057)
0.35 - 0.55 (0.014 - 0.022)
0.09 - 0.20 (0.004 - 0.008) (NOTE 2)
0.35 - 0.50 0.90 - 1.30 (0.014 - 0.020) (0.035 - 0.051) SIX PLACES (NOTE 2) S6 SOT-23 0898
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
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.
11
LT1783
TYPICAL APPLICATIO S
Current Source
VCC
INPUT DIFFERENTIAL VOLTAGE
INPUTS BELOW GROUND
1783 TA03
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
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
+
U
LT1634-1.25
R1
+
LT1783 2N3906 1.25V R1
1783 TA02
-
IOUT =
Protected Fault Conditions
OK! -18V V+ LT1783 OK! 5V V+ LT1783
24V
+
REVERSE BATTERY
INPUT OVERVOLTAGE
OK!
5V
OK!
5V
18V
+
LT1783
LT1783
10V
1783f LT/TP 0400 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1999

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