n Operates with Inputs Above V+
n Rail-to-Rail Input and Output
n Micropower: 55µA Supply Current Max
n Operating Temperature Range: –40°C to 125°C
n Low Profile (1mm) ThinSOT™ Package n Low Input Offset Voltage: 800µV Max n Single Supply Input Range: 0V to 18V n High Output Current: 18mA Min
n Specified on 3V, 5V and ±5V Supplies n Output Shutdown on 6-Lead Version n Reverse Battery Protection to 18V
n High Voltage Gain: 1500V/mV
n Gain Bandwidth Product: 200kHz
n Slew Rate: 0.07V/µs
n Portable Instrumentation
n Battery- or Solar-Powered Systems
n Sensor Conditioning
n Supply Current Sensing
n Battery Monitoring
n MUX Amplifiers
n 4mA to 20mA Transmitters
TYPICAL APPLICATION
V+
5V TO 18V
200Q
5V
LT1782
Micropower, Over-The-Top
SOT-23, Rail-to-Rail Input and Output Op Amp DESCRIPTION
The LT®1782 is a 200kHz op amp available in the small SOT-23 package that operates on all single and split sup- plies with a total voltage of 2.5V to 18V. The amplifier draws less than 55µA 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-Top™ opera- tion 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 5µA. The LT1782 op amp is available in the 5- and 6-lead SOT-23 packages. For applications requiring higher speed, refer to the LT1783.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and Over-The-Top are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
25 VS = 5V, 0V
VCM = 2.5V
PERCENTAGE OF AMPLIFIERS
20
15
0.2Q
200Q
LOAD
ILOAD
+
LT1782
–
MMBT3904
VOUT = 2Q(ILOAD) 0V TO 4.3V
2k
1782 TA01a
10
5
0
–900 –600 –300 0 300 600 900
INPUT OFFSET VOLTAGE (µV)
1782 TA01b
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............................................... –40°C to 85°C
LT1782I................................................ –40°C to 85°C
LT1782H ............................................ –40°C to 125°C
Specified Temperature Range (Note 4) LT1782C............................................... –40°C to 85°C
LT1782I................................................ –40°C to 85°C
LT1782H ............................................ –40°C to 125°C
Junction Temperature........................................... 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
+
–
+ –
TOP VIEW | TOP VIEW |
OUT 1 5 V+ | OUT 1 6 V+ |
V– 2 | V– 2 5 SHDN |
+IN 3 4 –IN | +IN 3 4 –IN |
S5 PACKAGE 5-LEAD PLASTIC TSOT-23 | S6 PACKAGE 6-LEAD PLASTIC TSOT-23 |
TJMAX = 150°C, JA = 250°C/W | TJMAX = 150°C, JA = 230°C/W |
LEAD FREE FINISH | TAPE AND REEL | PART MARKING | PACKAGE DESCRIPTION | SPECIFIED TEMPERATURE RANGE |
LT1782CS5#PBF | LT1782CS5#TRPBF | LTLD | 5-Lead Plastic TSOT-23 | 0°C to 70°C |
LT1782IS5#PBF | LT1782IS5#TRPBF | LTLE | 5-Lead Plastic TSOT-23 | –40°C to 85°C |
LT1782HS5#PBF | LT1782HS5#TRPBF | LTXK | 5-Lead Plastic TSOT-23 | –40°C to 125°C |
LT1782CS6#PBF | LT1782CS6#TRPBF | LTIS | 6-Lead Plastic TSOT-23 | 0°C to 70°C |
LT1782IS6#PBF | LT1782IS6#TRPBF | LTIT | 6-Lead Plastic TSOT-23 | –40°C to 85°C |
LT1782HS6#PBF | LT1782HS6#TRPBF | LTXL | 6-Lead Plastic TSOT-23 | –40°C to 125°C |
Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
SYMBOL | PARAMETER | CONDITIONS | LT1782C/LT1782I MIN TYP MAX | UNITS | |||
VOS | Input Offset Voltage | TA = 25°C 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C | l l | 400 | 800 950 1100 | µV µV µV | |
VOS/T | Input Offset Voltage Drift (Note 7) | l | 2 | 5 | µV/°C | ||
IOS | Input Offset Current | VCM = 18V (Note 5) | l l | 0.7 2 1 | nA µA | ||
IB | Input Bias Current | VCM = 18 (Note 5) SHDN or VS = 0V, VCM = 0V to 18V | l l | 8 6 0.1 | 15 12 | nA µA nA | |
Input Bias Current Drift | –40°C ≤ TA ≤ 85°C | l | 0.01 | nA/°C | |||
Input Noise Voltage | 0.1Hz to 10Hz | 1 | µVP-P | ||||
en | Input Noise Voltage Density | f = 1kHz | 50 | nV/√Hz | |||
in | Input Noise Current Density | f = 1kHz | 0.05 | pA/√Hz | |||
RIN | Input Resistance | Differential Common Mode, VCM = 0V to (VCC – 1V) Common Mode, VCM = 0V to 18V | l l | 3.4 6.5 5 1.5 3 | MΩ GΩ MΩ | ||
CIN | Input Capacitance | 5 | pF | ||||
Input Voltage Range | l | 0 | 18 | V | |||
CMRR | Common Mode Rejection Ratio (Note 5) | VCM = 0V to VCC – 1V VCM = 0V to 18V (Note 8) | l l | 90 68 | 100 80 | dB dB | |
PSRR | Power Supply Rejection Ratio | VS = 3V to 12.5V, VCM = VO = 1V | l | 90 | 100 | dB | |
AVOL | Large-Signal Voltage Gain | VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0°C ≤ TA ≤ 70°C VS = 3V, –40°C ≤ TA ≤ 85°C | l l | 200 133 100 | 1500 | V/mV V/mV V/mV | |
VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0°C ≤ TA ≤ 70°C VS = 5V, –40°C ≤ TA ≤ 85°C | l l | 400 250 200 | 500 | V/mV V/mV V/mV | |||
VOL | Output Voltage Swing LOW | No Load ISINK = 5mA VS = 5V, ISINK = 10mA | l l l | 3 200 400 | 8 500 800 | mV mV mV | |
VOH | Output Voltage Swing HIGH | VS = 3V, No Load VS = 3V, ISOURCE = 5mA | l l | 2.91 2.6 | 2.94 2.8 | V V | |
VS = 5V, No Load VS = 5V, ISOURCE = 10mA | l l | 4.91 4.5 | 4.94 4.74 | V V | |||
ISC | Short-Circuit Current (Note 2) | VS = 3V, Short to GND VS = 3V, Short to VCC | 5 15 | 10 30 | mA mA | ||
VS = 5V, Short to GND VS = 5V, Short to VCC | 15 20 | 30 40 | mA mA | ||||
Minimum Supply Voltage | l | 2.7 | V | ||||
Reverse Supply Voltage | IS = –100µA | l | 18 | V | |||
IS | Supply Current (Note 6) | 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C | l l | 40 | 55 60 65 | µA µA µA | |
Supply Current, SHDN | VPIN5 = 2V, No Load (Note 10) | l | 5 | 15 | µA |
SYMBOL | PARAMETER | CONDITIONS | LT1782C/LT1782I MIN TYP MAX | UNITS | |||
ISHDN | Shutdown Pin Current | VPIN5 = 0.3V, No Load (Note 10) VPIN5 = 2V, No Load (Note 10) VPIN5 = 5V, No Load (Note 10) | l l l | 0.5 2 5 | 8 | nA µA µA | |
Shutdown Output Leakage Current | VPIN5 = 2V, No Load (Note 10) | l | 0.05 1 | µA | |||
Maximum Shutdown Pin Current | VPIN5 = 18V, No Load (Note 10) | l | 10 | 30 | µA | ||
VL | Shutdown Pin Input Low Voltage | (Note 10) | l | 0.3 | V | ||
VH | Shutdown Pin Input High Voltage | (Note 10) | l | 2 | V | ||
tON | Turn-On Time | VPIN5 = 5V to 0V, RL = 10k (Note 10) | 100 | µs | |||
tOFF | Turn-Off Time | VPIN5 = 0V to 5V, RL = 10k (Note 10) | 6 | µs | |||
GBW | Gain Bandwidth Product (Note 5) | f = 5kHz 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C | l l | 110 100 90 | 200 | kHz kHz kHz | |
SR | Slew Rate (Note 5) | AV = –1, RL = ∞ 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C | l l | 0.035 0.031 0.028 | 0.07 | V/µs V/µs V/µs | |
tS | Settling Time | VS = 5V, VOUT = 2V to 0.1%, AV = –1 | 45 | µs | |||
THD | Distortion | VS = 3V, VO = 2VP-P, AV = 1, RL = 10k, f = 1kHz | 0.003 | % | |||
FPBW | Full-Power Bandwidth (Note 9) | VOUT = 2VP-P | 11 | kHz |
SYMBOL | PARAMETER | CONDITIONS | LT1782C/LT1782I MIN TYP MAX | UNITS | |
VOS | Input Offset Voltage | TA = 25°C 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C | l l | 500 900 1050 1200 | µV µV µV |
VOS/T | Input Offset Voltage Drift (Note 7) | l | 2 5 | µV/°C | |
IOS | Input Offset Current | l | 0.7 2 | nA | |
IB | Input Bias Current | l | 8 15 | nA | |
Input Bias Current Drift | l | 0.01 | nA/°C | ||
Input Noise Voltage | 0.1Hz to 10Hz | 1 | µVP-P | ||
en | Input Noise Voltage Density | f = 1kHz | 50 | nV/√Hz | |
in | Input Noise Current Density | f = 1kHz | 0.05 | pA/√Hz | |
RIN | Input Resistance | Differential Common Mode, VCM = –5V to 13V | l l | 3.4 6.5 1.5 3 | MΩ MΩ |
CIN | Input Capacitance | 5 | pF | ||
Input Voltage Range | l | –5 13 | V | ||
CMRR | Common Mode Rejection Ratio | VCM = –5V to 13V | l | 68 80 | dB |
AVOL | Large-Signal Voltage Gain | VO = ±4V, RL = 10k 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C | l l | 55 150 40 30 | V/mV V/mV V/mV |
SYMBOL | PARAMETER | CONDITIONS | LT1782C/LT1782I MIN TYP MAX | UNITS | |||
VOL | Output Voltage Swing LOW | No Load ISINK = 5mA ISINK = 10mA | l l l | –4.997 –4.8 –4.6 | –4.992 –4.5 –4.2 | V V V | |
VOH | Output Voltage Swing HIGH | No Load ISINK = 5mA ISINK = 10mA | l l l | 4.91 4.6 4.5 | 4.94 4.8 4.74 | V V V | |
ISC | Short-Circuit Current (Note 2) | Short to GND 0°C ≤ TA ≤ 70°C | l | 18 15 | 30 | mA mA | |
PSRR | Power Supply Rejection Ratio | VS = ±1.5V to ±9V | l | 90 | 100 | dB | |
IS | Supply Current | 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C | l l | 45 | 60 65 70 | µA µA µA | |
Supply Current, SHDN | VPIN5 = –3V, VS = ±5V, No Load (Note 10) | l | 6 | 20 | µA | ||
ISHDN | Shutdown Pin Current | VPIN5 = –4.7V, VS = ±5V, No Load (Note 10) VPIN5 = –3V, VS = ±5V, No Load (Note 10) | l l | 0.5 2 | 8 | nA µA | |
Maximum Shutdown Pin Current | VPIN5 = 9V, VS = ±9V (Note 10) | l | 10 | 30 | µA | ||
Shutdown Output Leakage Current | VPIN5 = –7V, VS = ±9V, No Load (Note 10) | l | 0.05 1 | µA | |||
VL | Shutdown Pin Input Low Voltage | VS = ±5V (Note 10) | l | –4.7 | V | ||
VH | Shutdown Pin Input High Voltage | VS = ±5V (Note 10) | l | –3 | V | ||
tON | Turn-On Time | VPIN5 = 0V to –5V, RL = 10k (Note 10) | l | 100 | µs | ||
tOFF | Turn-Off Time | VPIN5 = –5V to 0V, RL = 10k (Note 10) | l | 6 | µs | ||
GBW | Gain Bandwidth Product | f = 5kHz 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C | l l | 120 110 100 | 225 | kHz kHz kHz | |
SR | Slew Rate | AV = –1, RL = ∞, VO = ±4V, Measured at VO = ±2V 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C | l l | 0.0375 0.033 0.030 | 0.075 | V/µs V/µs V/µs | |
tS | Settling Time | VOUT = 4V to 0.1%, AV = 1 | 50 | µs | |||
FPBW | Full-Power Bandwidth (Note 9) | VOUT = 8VP-P | 3 | kHz |
SYMBOL | PARAMETER | CONDITIONS | LT1782H MIN TYP MAX | UNITS | |
VOS | Input Offset Voltage | l | 400 800 3 | µV mV | |
VOS/T | Input Offset Voltage Drift | l | 15 | µV/°C | |
IOS | Input Offset Current | VCM = 18V (Note 5) | l l | 3 2 | nA µA |
IB | Input Bias Current | VCM = 18V (Note 5) | l l | 30 25 | nA µA |
Input Voltage Range | l | 0.3 18 | V | ||
CMRR | Common Mode Rejection Ratio | VCM = 0.3V to VCC – 1V VCM = 0.3V to 18V | l l | 76 60 | dB dB |
SYMBOL | PARAMETER | CONDITIONS | MIN | LT1782H TYP | MAX | UNITS | |
AVOL | Large-Signal Voltage Gain | VS = 3V, VO = 500mV to 2.5V, RL = 10k | l | 200 50 | 1500 | V/mV V/mV | |
VS = 5V, VO = 500mV to 4.5V, RL = 10k | l | 400 80 | 1500 | V/mV V/mV | |||
VOL | Output Voltage Swing LOW | No Load ISINK = 5mA VS = 5V, ISINK = 10mA | l l l | 15 900 1500 | mV mV mV | ||
VOH | Output Voltage Swing HIGH | VS = 3V, No Load VS = 3V, ISOURCE = 5mA | l l | 2.85 2.20 | V V | ||
VS = 5V, No Load VS = 5V, ISOURCE = 10mA | l l | 4.85 3.80 | V V | ||||
PSRR | Power Supply Rejection Ratio | VS = 3V to 12.5V, VCM = VO = 1V | l | 80 | dB | ||
Minimum Supply Voltage | l | 2.7 | V | ||||
Reverse Supply Voltage | IS = –100µA | l | 18 | V | |||
IS | Supply Current | l | 40 | 55 100 | µA µA | ||
Supply Current, SHDN | VPIN5 = 2V, No Load (Note 10) | l | 25 | µA | |||
ISHDN | Shutdown Pin Current | VPIN5 = 0.3V, No Load (Note 10) VPIN5 = 2V, No Load (Note 10) | l l | 0.5 | 12 | nA µA | |
Output Leakage Current | VPIN5 = 2V, No Load (Note 10) | l | 3 | µA | |||
Maximum Shutdown Pin Current | VPIN5 = 18V, No Load | l | 45 | µA | |||
VL | Shutdown Pin Input Low Voltage | (Note 10) | l | 0.3 | V | ||
VH | Shutdown Pin Input High Voltage | (Note 10) | l | 2 | V | ||
GBW | Gain Bandwidth Product | f = 10kHz (Note 5) | l | 110 65 | 200 | kHz kHz | |
SR | Slew Rate | AV = –1, RL = ∞ (Note 7) | l | 0.035 0.020 | 0.07 | V/µs V/µs |
SYMBOL | PARAMETER | CONDITIONS | MIN | LT1782H TYP | MAX | UNITS | |
VOS | Input Offset Voltage | l | 500 | 900 3.2 | µV mV | ||
VOS/T | Input Offset Voltage Drift (Note 9) | l | 15 | µV/°C | |||
IOS | Input Offset Current | l | 3 | nA | |||
IB | Input Bias Current | l | 30 | nA | |||
CMRR | Common Mode Rejection Ratio | VCM = –4.7V to 13V | l | 60 | dB | ||
AVOL | Large-Signal Voltage Gain | VS = ±4V, RL = 10k | l | 55 20 | 150 | V/mV V/mV | |
VO | Output Voltage Swing | No Load ISINK = ±5mA ISINK = ±10mA | l l l | ±4.85 ±4.10 ±3.50 | V V V |
SYMBOL | PARAMETER | CONDITIONS | LT1782H MIN TYP MAX | UNITS | |
PSRR | Power Supply Rejection Ratio | VS = ±1.5V to ±9V | l | 80 | dB |
Minimum Supply Voltage | l | ±1.35 | V | ||
IS | Supply Current | l | 45 60 110 | µA µA | |
Supply Current, SHDN | VPIN5 = –3V, VS = ±5V, No Load (Note 10) | l | 25 | µA | |
ISHDN | Shutdown Pin Current | VPIN5 = –4.7V, VS = ±5V, No Load (Note 10) VPIN5 = –3V, VS = ±5V, No Load (Note 10) | l l | 0.5 12 | nA µA |
Maximum Shutdown Pin Current | VPIN5 = 9V, VS = ±9V, No Load (Note 10) | l | 45 | µA | |
Output Leakage Current | VPIN5 = –7V, VS = ±9V, No Load | l | 3 | µA | |
VL | Shutdown Pin Input Low Voltage | VS = ±5V | l | –4.7 | V |
VH | Shutdown Pin Input High Voltage | VS = ±5V | l | –3 | V |
GBW | Gain Bandwidth Product | f = 5kHz | l | 120 225 70 | kHz kHz |
SR | Slew Rate | AV = –1, RL = ∞, VO = ±4V Measured at VO = ±2V | l | 0.0375 0.075 0.0220 | V/µs V/µs |
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
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 –40°C to 85°C. The LT1782H is guaranteed functional over the operating temperature range of –40°C to 125°C.
Note 4: The LT1782C is guaranteed to meet specified performance from 0°C to 70°C. The LT1782C is designed, characterized and expected to meet specified performance from –40°C to 85°C but is not tested or
QA sampled at these temperatures. The LT1782I is guaranteed to meet specified performance from – 40°C to 85°C. The LT1782H is guaranteed to meet specified performance from –40°C to 125°C.
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/2�VP.
TA = 125°C | TA = –55°C | |||||||||
TA | = 25 | °C | ||||||||
50 400
5
VS = 5V, 0V
TA = 125°C
SUPPLY CURRENT (µA)
45
40
TA = 25°C
35 TA = –55°C
30
25
20
300
INPUT OFFSET VOLTAGE CHANGE (µV)
200
100
0
–100
–200
–300
–400
4
VOUT (V)
3
2 5V
VIN +
1 –
0
2 4 6 8 10 12
14 16 18
0 1 2 3 4 5
–10 –8 –6 –4 –2 0 2 4 6 8 10 12 14 16 18
SUPPLY VOLTAGE (V)
1782 G01
TOTAL SUPPLY VOLTAGE (V)
1782 G02
VIN (V)
1782 G03
VS = 5V, 0V
6000
1 VS = ±2.5V
1
V = ±2.5V
5000
INPUT BIAS CURRENT (nA)
4000
3000
2000
1000
40
30
20
10
0
–10
C
TA = 125°
TA = 25°C
C
TA = –55°
0.1
OUTPUT SATURATION VOLTAGE (V)
0.01
VOD
= 30mV
TA = 25°C
TA = 125°C
TA = –55°C
0.1
OUTPUT SATURATION VOLTAGE (V)
0.01
0.001
S
VOD = 30mV
TA = 25°C
TA = 125°C
TA = –55°C
3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.4 15 16 18
1µ 10µ
100µ
1m 10m
1µ 10µ
1µ 1m 10m
COMMON MODE VOLTAGE (V)
1782 G04
SOURCING LOAD CURRENT (A) SINKING LOAD CURRENT (A)
1782 G05
1782 G06
OUTPUT SATURATION VOLTAGE (mV)
100
10
VS = ±2.5V | |||||||||
40
VS = ±5V
NOISE VOLTAGE (400nV/DIV)
35
OUTPUT CURRENT (mA)
SINKING CURRENT
30
SOURCING CURRENT
25
OUTPUT HIGH | |||||
OUTPUT LOW | |||||
VS = ±2.5V NO LOAD |
1
0 10 20 30 40 50 60
INPUT OVERDRIVE (mV)
1782 G07
20
15
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
1782 G08
0 1 2 3 4 5 6 7 8 9 10
TIME (sec)
1782 G09
VS = ±2.5V
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
INPUT NOISE CURRENT DENSITY (pA/√Hz)
80 0.40
70 0.35
0.30
60 0.25
50 0.20
40 0.15
0.10
30 0.05
20 0
70
60
50
40
GAIN (dB)
30
20
10
0
–10
–20
–30
P
HASE
GAIN
100
VS = ±2.5V
80
60
PHASE SHIFT (DEG)
40
20
0
–20
–40
–60
–80
–100
1 10
100 1k 10k FREQUENCY (Hz)
1782 G10
1 10
100 1k 10k 1k FREQUENCY (Hz)
1782 G11
10k 100k 1M FREQUENCY (Hz)
1782 G12
230
GAIN BANDWIDTH (kHz)
220
210
200
190
180
170
f = 5kHz VS = ±2.5V | ||||||
VS = ±2.5V | ||||||
RISING | ||||||
FALLING | ||||||
0.11
0.10
SLEW RATE (V/µs)
0.09
0.08
0.07
0.06
0.05
0.04
240
GAIN BAINDWIDTH PRODUCT (kHz)
220
200
180
160
PHASE MARGIN (DEG)
60
PHASE MARGIN 55
50
GAIN BANDWIDTH PRODUCT
AV = –1
RF = RG = 10k
f = 5kHz
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
1782 G13
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
1782 G14
0 2 4 6 8 10 12 14 16 18
TOTAL SUPPLY VOLTAGE (V)
1782 G15
VS = ±2.5V
GAIN BANDWIDTH PRODUCT (kHz)
250
200
VS = ±2.5V AV = –1
RF = RG = 10k
f = 5kHz
70 90
PHASE MARGIN (DEG)
POWER SUPPLY REJECTION RATIO (dB)
80
PHASE MARGIN 60 70
50 60
50
40
30
POSITIVE SUPPLY
110
VS = ±2.5V
COMMON MODE REJECTION RATIO (dB)
100
90
80
70
60
150
100
50
1k
GAIN BANDWIDTH PRODUCT
10k 100k
LOAD RESISTANCE (Ω)
1782 G16
20
10
0
–10
1k
50
NEGATIVE SUPPLY
40
30
10k 100k 1M 1k
FREQUENCY (Hz)
1782 G17
10k 100k
FREQUENCY (Hz)
1782 G18
10k
OUTPUT IMPEDANCE (Ω)
1k
100
10
1
0.1
VS = ±2.5V | |||||||||||||||
AV = 100 | |||||||||||||||
AV = 10 | |||||||||||||||
AV = 1 | |||||||||||||||
1M
OUTPUT IMPEDANCE (Ω)
100k
10k
1k
100
VS = ±2.5V
VPIN5 (SHUTDOWN) = 2.5V
4
AV = 1
3
OUTPUT STEP (V)
2
1
0 VS = ±5V
–1
AV = –1
AV = 1
–2
–3
–4
AV = –1
100
1k 10k
FREQUENCY (Hz)
100k 1M
1782 G19
100
1k 10k 100k 1M FREQUENCY (Hz)
1782 G20
25 30 35 40 50 60 70 80
SETTLING TIME (µs)
1782 G21
40 VS = 5V, 0V
12 DISTORTION ≤ 1%
1
VS = 3V, 0V
OVERSHOOT (%)
35 VCM = 2.5V 30
25
AV = 1
20
15
10
5
AV = 10
AV = 5
0
10 VS = ±5V 8
OUTPUT SWING (VP-P)
6
4 VS = ±1.5V
2
0
AV = 1
THD + NOISE (%)
0.1
0.010
0.001
VOUT = 2VP-P VCM = 1.2V RL = 10k
AV = –1
RF = RG = 100k
AV = 1
10 100 1000 10000
100 1k 10k 100k 10
100
1k 10k
CAPACITIVE LOAD (pF)
1782 G22
FREQUENCY (Hz)
1782 G23
FREQUENCY (Hz)
1782 G24
10 VS
= 3V TOTAL
10
VS = ±5V
INPUT OFFSET VOLTAGE CHANGE (50µV/DIV)
f = 1kHz, RL = 10k
AV = 1
VIN = 2VP-P AT 1kHz
1
AV = 1
1 VS = ±1.5V
AV = –1, RF = RG = 100k VS = ±1.5V
THD + NOISE (%)
0.1
0.01
0.001
VS = ±1.5V VIN = ±1V
VS = 3V, 0V
VIN = 0.5V TO 2.5V
VS = 3V, 0V
VIN = 0.2V TO 2.2V
0.1
THD + NOISE (%)
0.01
0.001
VCM = 0V
AV = 1
VS = 3V. 0V VCM = 1.5V
VCM = 0V
AV = –1, RF = RG = 100k VS = 3V, 0V
VCM = 1.5V
RL = 10k
RL = 50k
RL = 2k
100
1k 10k
LOAD RESISTANCE TO GROUND (Ω)
100k
0 1 2 3
OUTPUT VOLTAGE AMPLITUDE (VP-P)
–6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6
OUTPUT VOLTAGE (V)
1782 G25
1782 G26
1782 G27
VS = 5V, 0V
50
TA = 125°C
SUPPLY CURRENT (µA)
40
TA = 25°C
30
TA = –55°C
20
10
0
0 0.5 1 1.5 2 2.5
SHUTDOWN PIN VOLTAGE (V)
VS = ±5V AV = 1
CL = 15pF
1782 G29 VS = ±5V
AV = 1
CL = 15pF
1782 G30
1782 G28
The positive supply pin of the LT1782 should be bypassed with a small capacitor (typically 0.1µF) within an inch of the pin. When driving heavy loads, an additional 4.7µF 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.
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 tem- perature 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 tran- sistors, 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 4µA 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+.
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.
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 section.
The LT1782 is internally compensated to drive at least 600pF of capacitance under any output loading condi- tions. A 0.22µF capacitor in series with a 150Ω resistor between the output and ground will compensate these amplifiers for larger capacitive loads, up to 10,000pF, at all output currents.
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 non- linear 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 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.”
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.
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 5µA and the output leakage
current is less than 1µA (V– ≤ VOUT ≤ V+). In normal opera- tion, the SHDN pin can be tied to V– or left floating. See the Typical Performance Characteristics curves, “Supply
Current vs Shutdown Pin Voltage.”
SHDN
J1
R1
30k
+
Q1
R2
6k
Q4 –IN
R3
D1
Q7 Q8
Q2
Q11 Q12
Q3
D3
Q19
Q17 Q20
Q22
V+
OUT
Q26
2µA
6k
+IN
Q9 Q10
Q13 Q14
Q15
Q16 Q18
Q21
Q25 Q23 Q24 Q5 Q6
D4 D5
R4
40k
R5
40k
V–
1782 SS
OK!
–18V
V+ LT1782
OK!
+
24V
5V
LT1782
REVERSE BATTERY INPUT OVERVOLTAGE
OK! 5V OK! 5V
+
18V
LT1782 LT1782
+
10V
INPUT DIFFERENTIAL VOLTAGE INPUT BELOW GROUND
1782 TA02
VS 2.8V to 3.3V
SUPPLY CURRENT 120µA, NO LOAD
680Q
5%
100k
5%
22Q
5%
+
LT1782
–
0.1µF
1k
5% VISHAY SILICONIX Si3445DV
LT1790-2.5
1µF
VOUT
1782 TA03 2.5V
ILOAD = 0mA TO 300mA
NOTE: NOT CURRENT LIMITED
(Reference LTC DWG # 05-08-1635)
0.62
MAX
0.95
REF
2.90 BSC (NOTE 4)
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.95 BSC
0.30 – 0.45 TYP
PLCS (NOTE 3)
0.20 BSC DATUM ‘A’
0.09 – 0.20
(NOTE 3)
0.80 – 0.90
1.00 MAX
0.01 – 0.10
NOTE:
0.30 – 0.50 REF
1.90 BSC
DIMENSIONS ARE IN MILLIMETERS
DRAWING NOT TO SCALE
DIMENSIONS ARE INCLUSIVE OF PLATING
DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
MOLD FLASH SHALL NOT EXCEED 0.254mm
JEDEC PACKAGE REFERENCE IS MO-193
(Reference LTC DWG # 05-08-1636)
S5 TSOT-23 0302 REV B
0.62
MAX
0.95
REF
2.90 BSC (NOTE 4)
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
PIN ONE ID
(NOTE 4)
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.95 BSC
0.30 – 0.45
PLCS (NOTE 3)
0.20 BSC DATUM ‘A’
0.09 – 0.20
(NOTE 3)
0.80 – 0.90
1.00 MAX
0.01 – 0.10
NOTE:
0.30 – 0.50 REF
1.90 BSC
S6 TSOT-23 0302 REV B
DIMENSIONS ARE IN MILLIMETERS
DRAWING NOT TO SCALE
DIMENSIONS ARE INCLUSIVE OF PLATING
DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
MOLD FLASH SHALL NOT EXCEED 0.254mm
JEDEC PACKAGE REFERENCE IS MO-193
1782fc
REV | DATE | DESCRIPTION | PAGE NUMBER |
C | 10/10 | Revised supply current in shutdown mode from 5mA to 5µA in Shutdown section of Applications Information | 12 |
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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1782fc
15
VCC
LT1634-1.25 R1
+
LT1782
R1
–
2N3906 IOUT = 1.25V
1782 TA04
AV = 20
SHDN
+
IN
VCC
AV = 2
SHDN
+
30
AV = 20 | ||||||||||||||
AV = 2 | ||||||||||||||
25
20
VCC 15
GAIN (dB)
10
5
VCC
LT1782
LT1784
–
VEE
OUT
0
–5
–10
–15
R2 9.09k
–
R1
10k
VEE
AV = 1+ R1 + R2
( )
( )
R3
OR 1+ R1
R2 + R3
–20
1k
10k
100k 1M 10M FREQUENCY (Hz)
1782 TA06
1782 TA05
R3
1k
PART NUMBER | DESCRIPTION | COMMENTS |
LT1783 | Micropower Over-The-Top SOT-23 Rail-to-Rail Input and Output Op Amp | SOT-23 Package, Micropower 210µA per Amplifier, Rail-to-Rail Input and Output, 1.25MHz GBW |
LT1490/LT1491 | Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps | Single Supply Input Range: –0.4V to 44V, Micropower 50µA per Amplifier, Rail-to-Rail Input and Output , 200kHz GBW |
LT1636 | Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp | 55µA Supply Current, VCM Extends 44V Above VEE, Independent of VCC, MSOP Package, Shutdown Function |
LT1638/LT1639 | Dual/Quad, 1.2MHz, 0.4V/µs, Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps | 170mA Supply Current, Single Supply Input Range: –0.4V to 44V, Rail-to-Rail Input and Output |
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
1782fc
LT 1010 REV C • PRINTED IN USA
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 1999
Mouser Electronics
Authorized Distributor
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