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LT1782 Micropower, Over-The-Top SOT-23, Rail-to-Rail Input and Output Op Amp
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: 55A Supply Current Max Operating Temperature Range: - 40C to 125C Low Profile (1mm) ThinSOTTM Package 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 Gain Bandwidth Product: 200kHz Slew Rate: 0.07V/s
The LT(R)1782 is a 200kHz 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 55A of quiescent current and has reverse battery protection, drawing negligible current for reverse supply voltages up to 18V. The input range of the LT1782 includes ground, and a unique feature of this device is its Over-The-TopTM operation capability 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 LT1782 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 LT1782 op amp is available in the 5- and 6-lead SOT-23 packages. For applications requiring higher speed, refer to the LT1783.
, 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
25 VS = 5V, 0V VCM = 2.5V
Positive Supply Rail Current Sense
PERCENTAGE OF AMPLIFIERS
20
15
+
LT1782 MMBT3904 VOUT = 2(ILOAD) 0V TO 4.3V 2k
1782 TA01
10
-
5
LOAD
ILOAD
0 -900
-600 -300 0 300 600 INPUT OFFSET VOLTAGE (V)
U
900
1782 TA01a
U
U
1
LT1782
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) LT1782C ............................................ - 40C to 85C LT1782I ............................................. - 40C to 85C LT1782H ......................................... - 40C to 125C
PACKAGE/ORDER I FOR ATIO
TOP VIEW OUT 1 V- 2 +IN 3
+-
ORDER PART NUMBER
TOP VIEW 5 V+
4 -IN
LT1782CS5 LT1782IS5 LT1782HS5 S5 PART MARKING LTLD LTLE LTXK
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
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 CONDITIONS TA = 25C 0C TA 70C -40C TA 85C
q q q
VOS/T Input Offset Voltage Drift (Note 7) IOS IB Input Offset Current VCM = 18V (Note 5) Input Bias Current VCM = 18 (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 -40C TA 85C 0.1Hz to 10Hz f = 1kHz f = 1kHz
2
U
U
W
WW U
W
(Note 1)
Specified Temperature Range (Note 4) LT1782C ............................................ - 40C to 85C LT1782I ............................................. - 40C to 85C LT1782H ......................................... - 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
LT1782CS6 LT1782IS6 LT1782HS6 S6 PART MARKING LTIS LTIT LTXL
S6 PACKAGE 6-LEAD PLASTIC SOT-23
TJMAX = 150C, JA = 230C/ W
LT1782C/LT1782I MIN TYP MAX 400 800 950 1100 5 2 1 15 12
UNITS V V V V/C nA A nA A nA nA/C VP-P nV/Hz pA/Hz
2 0.7 8 6 0.1 0.01 1 50 0.05
q q q q q
LT1782
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 RIN Input Resistance CONDITIONS Differential Common Mode, VCM = 0V to (VCC - 1V) Common Mode, VCM = 0V to 18V
q q
LT1782C/LT1782I MIN TYP MAX 3.4 1.5 0 90 68 90 200 133 100 400 250 200 100 80 100 1500 6.5 5 3 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
3 200 400 2.91 2.6 4.91 4.5 5 15 15 20 2.94 2.8 4.94 4.74 10 30 30 40
8 500 800
mV mV mV V V V V mA mA mA mA V V
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 q
2.7 18 40 55 60 65 15 8 1 30 0.3 2 100 6 110 100 90 200
A A A A nA A A A A V V s s kHz kHz kHz
5 0.5 2 5 0.05 10
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
LT1782
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 SR Slew Rate (Note 5) Settling Time Distortion Full-Power Bandwidth (Note 9) CONDITIONS AV = -1, RL = 0C TA 70C -40C TA 85C VS = 5V, VOUT = 2V to 0.1%, AV = -1 VS = 3V, VO = 2VP-P, AV = 1, RL = 10k, f =1kHz VOUT = 2VP-P
q q
LT1782C/LT1782I MIN TYP MAX 0.035 0.031 0.028 0.07
UNITS V/s V/s V/s s % kHz
tS THD FPBW
45 0.003 11
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.
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS TA = 25C 0C TA 70C -40C TA 85C
q q q q q q
LT1782C/LT1782I MIN TYP MAX 500 900 1050 1200 5 2 15
UNITS V V V V/C nA nA nA/C VP-P nV/Hz pA/Hz M M pF
VOS/T Input Offset Voltage Drift (Note 7) 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 0.7 8 0.01 1 50 0.05
q q
3.4 1.5 -5 68 55 40 30
6.5 3 5 13 80 150
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 - 4.6 4.91 4.6 4.5 18 15 90 4.94 4.8 4.74 30 100 45
- 4.992 - 4.5 - 4.2
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
60 65 70 20 8
A A A A nA A
6 0.5 2
4
LT1782
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.
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 = 4V to 0.1%, AV = 1 VOUT = 8VP-P
q q q q q q q q q q
LT1782C/LT1782I MIN TYP MAX 10 0.05 -3 100 6 120 110 100 0.0375 0.033 0.030 225 30 1 - 4.7
UNITS A A V V s s kHz kHz kHz V/s V/s V/s s kHz
SR
Slew Rate
0.075
tS FPBW
Settling Time Full-Power Bandwidth (Note 9)
50 3
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 q
CONDITIONS
MIN
LT1782H TYP 400
MAX 800 3 15 3 2 30 25
UNITS V mV V/C nA A nA A V dB dB
VOS/T Input Offset Voltage Drift 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
0.3 76 60 200 50 400 80 1500 1500
18
V/mV V/mV V/mV V/mV 15 900 1500 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 2.20 4.85 3.80 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
LT1782
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
LT1782H TYP 40
MAX 55 100 25
UNITS A A A nA A A A V V kHz kHz V/s V/s
Supply Current, SHDN ISHDN Shutdown Pin Current Output Leakage Current Maximum Shutdown Pin Current VL VH GBW SR Shutdown Pin Input Low Voltage Shutdown Pin Input High Voltage 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) (Note 10) f = 10kHz (Note 5)
q q q q q q q q
0.5 12 3 45 0.3 2 110 65 0.035 0.020 200 0.07
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, for the 6-lead part VPIN5 = V-, pulse power tested unless otherwise specified. (Note 4)
SYMBOL PARAMETER VOS Input Offset Voltage
q q q q
CONDITIONS
MIN
LT1782H TYP 500
MAX 900 3.2 15 3 30
UNITS V mV V/C nA nA dB V/mV V/mV V V V dB V
VOS/T 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 VS = 4V, RL = 10k
q q
60 55 20 4.85 4.10 3.50 80 1.35 45 60 110 25 0.5 12 45 3 - 4.7 -3 120 70 0.0375 0.0220 225 0.075 150
No Load ISINK = 5mA ISINK = 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, No Load (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
LT1782
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 LT1782C and LT1782I are guaranteed functional over the operating temperature range of - 40C to 85C. The LT1782H is guaranteed functional over the operating temperature range of - 40C to 125C. Note 4: The LT1782C is guaranteed to meet specified performance from 0C to 70C. The LT1782C is designed, characterized and expected to meet specified performance from - 40C to 85C but is not tested or QA sampled at these temperatures. The LT1782I is guaranteed to meet specified performance from - 40C to 85C. The LT1782H 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 for the slew rate. FPBW = SR/2VP.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
50 TA = 125C 45 SUPPLY CURRENT (A) 40 35 30 25 20 2 4 6 8 10 12 14 SUPPLY VOLTAGE (V) 16 18
INPUT OFFSET VOLTAGE CHANGE (V)
TA = -55C
0 TA = 125C -100 -200 -300 -400 0 1 2 3 4 TOTAL SUPPLY VOLTAGE (V) 5
1782 G02
TA = -55C TA = 25C
VOUT (V)
TA = 25C
UW
1782 G01
Minimum Supply Voltage
400 300 200 100
4 5
Output Voltage vs Large Input Voltage
VS = 5V, 0V
3 5V VIN 1 + -
2
0 -10-8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 VIN (V)
1782 G02a
7
LT1782 TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias Current vs Common Mode Voltage
6000
OUTPUT SATURATION VOLTAGE (V) 1
4000
INPUT BIAS CURRENT (nA)
TA = 125C
3000 2000 1000 40 30 20 10 0 -10 15 16 18 3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.4 COMMON MODE VOLTAGE (V)
1782 G03
OUTPUT SATURATION VOLTAGE (V)
5000
VS = 5V, 0V
TA = 25C
TA = -55C
Output Saturation Voltage vs Input Overdrive
100
OUTPUT SATURATION VOLTAGE (mV) 40
OUTPUT HIGH
35 OUTPUT CURRENT (mA)
SINKING CURRENT 30 SOURCING CURRENT 25
10
OUTPUT LOW VS = 2.5V NO LOAD 1 0 10 20 30 40 50 INPUT OVERDRIVE (mV) 60
1782 G06
20
15 -50
-25
0 25 50 75 TEMPERATURE (C)
100
125
NOISE VOLTAGE (400nV/DIV)
Noise Voltage Density vs Frequency
80 0.40 INPUT NOISE CURRENT DENSITY (pA/Hz) 0.35 0.30
INPUT NOISE VOLTAGE DENSITY (nV/Hz)
70 60 50 40 30 20
GAIN (dB)
1
10
100 1k FREQUENCY (Hz)
8
UW
1782 G08
Output Saturation Voltage vs Load Current (Output High)
1
Output Saturation Voltage vs Load Current (Output Low)
VS = 2.5V VOD = 30mV 0.1 TA = 125C
VS = 2.5V VOD = 30mV
TA = 125C 0.1 TA = 25C TA = -55C
TA = 25C 0.01
TA = -55C
0.01 1
0.001
10 100 1m SOURCING LOAD CURRENT (A)
10m
1782 G04
1
10 1 1m SINKING LOAD CURRENT (A)
10m
1782 G05
Output Short-Circuit Current vs Temperature
VS = 5V
0.1Hz to 10Hz Noise Voltage
VS = 2.5V
0
1
2
3
456 TIME (sec)
7
8
9
10
1782 G06a
1782 G07
Input Noise Current vs Frequency
70 VS = 2.5V 60 50 40 30 20 10 0 0.10 0.05 0 1 10 100 1k FREQUENCY (Hz) 10k
1782 G09
Gain and Phase Shift vs Frequency
100 VS = 2.5V PHASE 80 60 40 20 GAIN 0 -20 -40 -60 -80 1k 10k 100k FREQUENCY (Hz) -100 1M
1782 G10
PHASE SHIFT (DEG)
0.25 0.20 0.15
-10 -20 -30
10k
LT1782 TYPICAL PERFOR A CE CHARACTERISTICS
Gain Bandwidth Product vs Temperature
230 220 GAIN BANDWIDTH (kHz) 210 200 190 180 170 -50 f = 5kHz VS = 2.5V 0.11 0.10 VS = 2.5V RISING PHASE MARGIN
GAIN BAINDWIDTH PRODUCT (kHz)
SLEW RATE (V/s)
-25
0 25 50 75 TEMPERATURE (C)
Gain Bandwidth Product and Phase Margin vs Load Resistance
70 PHASE MARGIN
GAIN BANDWIDTH PRODUCT (kHz)
POWER SUPPLY REJECTION RATIO (dB)
60 50
80 70 60 50 40 30 20 10 0 1k
COMMON MODE REJECTION RATIO (dB)
250 200 150 100 50 1k
VS = 2.5V AV = -1 RF = RG = 10k f = 5kHz GAIN BANDWIDTH PRODUCT
10k LOAD RESISTANCE ()
Output Impedance vs Frequency
10k VS = 2.5V 1M
OUTPUT IMPEDANCE ()
OUTPUT IMPEDANCE ()
1k
AV = 100 AV = 10
OUTPUT STEP (V)
100
10
AV = 1
1
0.1 100
1k
10k 100k FREQUENCY (Hz)
UW
100
1782 G11
Slew Rate vs Temperature
Gain Bandwidth Product and Phase Margin vs Supply Voltage
PHASE MARGIN (DEG)
60 55 50
0.09 0.08 FALLING 0.07 0.06 0.05 0.04 -50
240 220 200 180 160 0 2 4 6 8 10 12 14 16 TOTAL SUPPLY VOLTAGE (V) GAIN BANDWIDTH PRODUCT AV = -1 RF = RG = 10k f = 5kHz
125
-25
0 25 50 75 TEMPERATURE (C)
100
125
18
1782 G12
1782 G13
PSRR vs Frequency
90 VS = 2.5V
110 100 90 80 70 60 50 40 30 PHASE MARGIN (DEG)
CMRR vs Frequency
VS = 2.5V
POSITIVE SUPPLY
NEGATIVE SUPPLY
-10
100k
1782 G14
10k 100k FREQUENCY (Hz)
1M
1782 G15
1k
10k FREQUENCY (Hz)
100k
1782 G16
Disabled Output Impedance vs Frequency (Note 8)
4 VS = 2.5V VPIN5 (SHUTDOWN) = 2.5V 100k 3 2 1 0 -1 -2
Settling Time to 0.1% vs Output Step
AV = 1
AV = -1
10k
VS = 5V
1k
AV = 1 -3 1M
1782 G17
AV = -1
100 100
1k
10k 100k FREQUENCY (Hz)
1M
1782 G17a
-4 25 30 35 40 50 60 SETTLING TIME (s) 70 80
1782 G18
9
LT1782 TYPICAL PERFOR A CE CHARACTERISTICS
Capacitive Load Handling Overshoot vs Capacitive Load
40 35 30
OVERSHOOT (%) 12
VS = 5V, 0V VCM = 2.5V
OUTPUT SWING (VP-P)
25 20 15 10 5 0 10 100 1000 CAPACITIVE LOAD (pF) 10000
1782 G19
6 4 2 VS = 1.5V
AV = 1 AV = 5 AV = 10
THD + NOISE (%)
Total Harmonic Distortion + Noise vs Load Resistance
10 VS = 3V TOTAL AV = 1 VIN = 2VP-P AT 1kHz VS = 1.5V VIN = 1V 0.1 VS = 3V, 0V VIN = 0.5V TO 2.5V 0.01 VS = 3V, 0V VIN = 0.2V TO 2.2V 10
f = 1kHz, RL = 10k AV = 1 VS = 1.5V VCM = 0V AV = -1, RF = RG = 100k VS = 1.5V VCM = 0V
INPUT OFFSET VOLTAGE CHANGE (50V/DIV)
1
THD + NOISE (%)
THD + NOISE (%)
0.001 100
1k 10k LOAD RESISTANCE TO GROUND ()
Supply Current vs Shutdown Voltage
50 TA = 125C 40 SUPPLY CURRENT (A) TA = 25C 30 TA = -55C 20 VS = 5V, 0V
10
0 0 0.5 1 1.5 2 SHUTDOWN PIN VOLTAGE (V) 2.5
1782 G25
10
UW
1782 G22
Undistorted Output Swing vs Frequency
1
Total Harmonic Distortion + Noise vs Frequency
VS = 3V, 0V VOUT = 2VP-P VCM = 1.2V RL = 10k
10 8
VS = 5V
DISTORTION 1% AV = 1
0.1
0.010
AV = -1 RF = RG = 100k
AV = 1
0 100
0.001
1k 10k FREQUENCY (Hz)
100k
1782 G20
10
1k 100 FREQUENCY (Hz)
10k
1782 G21
Total Harmonic Distortion + Noise vs Output Voltage Amplitude
Open-Loop Gain
VS = 5V
1
RL = 10k RL = 50k
0.1
0.01 AV = 1 VS = 3V. 0V VCM = 1.5V 0 AV = -1, RF = RG = 100k VS = 3V, 0V VCM = 1.5V 3
RL = 2k
0.001 100k
1 2 OUTPUT VOLTAGE AMPLITUDE (VP-P)
-6 -5 -4 -3 -2 -1 0 1 2 3 OUTPUT VOLTAGE (V)
4
5
6
1782 G23
1782 G24
Large-Signal Response
Small-Signal Response
VS = 5V AV = 1 CL = 15pF
1782 G26
VS = 5V AV = 1 CL = 15pF
1782 G27
LT1782
APPLICATIO S I FOR ATIO
Supply Voltage
The positive supply pin of the LT1782 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 LT1782 is protected against reverse battery voltages up to 18V. In the event a reverse battery condition occurs, the supply current is typically less than 1nA. Inputs The LT1782 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 -8nA. 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 15nA. 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 NPN transistors, along with special geometries for these NPN transistors, allows the LT1782 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 4A at room temperature. The input offset voltage is typically 1.8mV when operating above V +. The LT1782 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 6k resistor in series with each input and a diode from the input to the negative supply. The input stage of the LT1782 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 LT1782 can swing to within 60mV of the positive rail with no load and within 3mV of the negative rail with no load. When monitoring 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 LT1782 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 LT1782 is internally compensated to drive at least 600pF 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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LT1782
APPLICATIO S I FOR ATIO
typically 100dB. When the LT1782 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 LT1782 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 Ouput 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 30k Q4 J1 - IN Q17 2A +IN Q26 Q9 Q10 Q13 Q14 R3 6k Q7 Q8 Q11 Q12 Q16 Q15 Q21 Q18 Q20 OUT R2 6k Q2 D3 Q3 Q22
+
Q25 Q23
Q24
Q5
Q6
D4
12
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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 Pin Voltage."
Q19 D5 R4 40k R5 40k V-
1782 SS
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LT1782
TYPICAL APPLICATIO S
Protected Fault Conditions
INPUT DIFFERENTIAL VOLTAGE
INPUT BELOW GROUND
1782 TA03
Compact, High Output Current, Low Dropout, Precision 2.5V Supply
VS 2.8V to 3.3V SUPPLY CURRENT 120A, NO LOAD 22 5%
+
680 5% LT1782
1k 5%
-
100k 5% 0.1F
LT1790-2.5 1F ILOAD = 0mA TO 300mA NOTE: NOT CURRENT LIMITED
1782 TA04
+
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OK!
-18V V+ LT1782
OK!
5V
LT1782
24V
+
REVERSE BATTERY
INPUT OVERVOLTAGE
OK!
5V
OK!
5V
18V
+
LT1782 LT1782
10V
VISHAY SILICONIX Si3445DV
VOUT 2.5V
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LT1782
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
(LTC DWG # 05-08-1633) (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
LT1782
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
(LTC DWG # 05-08-1634) (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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LT1782
TYPICAL APPLICATIO S
Current Source
VCC
Programmable Gain, AV = 2, AV = 20, 100kHz Amplifier
VCC AV = 20 AV = 2 SHDN IN SHDN VCC VCC
+
LT1784 OUT
GAIN (dB)
-
VEE
+
LT1782
-
VEE R2 9.09k R3 1k R1 10k AV = 1+
OR
RELATED PARTS
PART NUMBER LT1783 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 210A per Amplifier, Rail-to-Rail Input and Output , 1.25MHz 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
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LT1634-1.25
R1
+
LT1782 2N3906 1.25V R1
1782 TA02
-
IOUT =
Programmable Gain Amplifier Frequency Response
30 25 20 15 10 5 0 -5 -10 AV = 2 AV = 20
1+
( (
R1 + R2 R3 R1 R2 + R3
) )
1782 TA05a
-15 -20 1k 10k 100k 1M FREQUENCY (Hz) 10M
1782 TA05b
1782fa LT/TP 0501 1.5K REV A * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 1999

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