LT1783 [Linear]
1.25MHz, Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amp in SOT-23; 1.25MHz的，过度的顶级微功耗，轨到轨输入和输出运算放大器采用SOT -23
| 型号： | LT1783 |
| 厂家： | 
Linear |
| 描述： | 1.25MHz, Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amp in SOT-23 |
| 文件： | 总12页 (文件大小：214K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1783
1.25MHz, Over-The-Top
Micropower, Rail-to-Rail
Input and Output Op Amp in SOT-23
U
DESCRIPTIO
FEATURES
Operates with Inputs Above V+
The LT®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 300µA of quiescent current and has
reverse battery protection, drawing negligible current for
reverse supply voltages up to 18V.
■
■
Rail-to-Rail Input and Output
■
Micropower: 300
µA Supply Current Max
■
■
■
■
■
■
■
■
■
■
■
Small SOT-23 Package
Gain Bandwidth product: 1.25MHz
Slew Rate: 0.42V/µs
Low Input Offset Voltage: 800µV 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 input range of the LT1783 includes ground, and a
unique feature of this device is its Over-The-TopTM opera-
tion 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.
Operating Temperature Range: –40°C to 85°C
U
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 5µA. The
LT1783 op amp is available in the 5- and 6-lead
SOT-23packages.Forapplicationsrequiringlowerpower,
refer to the LT1782.
APPLICATIO S
■
Portable Instrumentation
■
Battery- or Solar-Powered Systems
■
Sensor Conditioning
■
Supply Current Sensing
■
Battery Monitoring
■
MUX Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
■
4mA to 20mA Transmitters
U
TYPICAL APPLICATIO
Distribution of Input Offset Voltage
25
Positive Supply Rail Current Sense
V
V
= 5V, 0V
CM
S
= 2.5V
+
20
15
10
5
V
5V TO 18V
200Ω
5V
0.2Ω
+
2N3904
V
LT1783
200Ω
= 2Ω(I
)
LOAD
–
OUT
0V TO 4.3V
I
2k
LOAD
LOAD
0
–900 –600 –300
0
300
600
900
INPUT OFFSET VOLTAGE (µV)
1783 TA01
1782 G25
1
LT1783
W W U W
(Note 1)
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
Operating Temperature Range (Note 10) –40°C to 85°C
Specified Temperature Range...................... 0°C to 70°C
Junction Temperature........................................... 150°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
U
W U
PACKAGE/ORDER INFORMATION
TOP VIEW
TOP VIEW
ORDER PART
ORDER PART
NUMBER
+
+
1
2
3
5
V
OUT
V
OUT 1
–
6
5
4
NUMBER
–
SHDN
–IN
V
V
2
+IN
4
–IN
LT1783CS5
+IN 3
LT1783CS6
S5 PACKAGE
5-LEAD PLASTIC SOT-23
S6 PACKAGE
6-LEAD PLASTIC SOT-23
S5 PART MARKING
LTLF
S6 PART MARKING
LTIU
TJMAX = 150°C, θJA = 250°C/ W
TJMAX = 150°C, θJA = 230°C/ W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified.
The ● denotes specifications which apply over the specified temperature range, otherwise specifications are T = 25°C.
A
SYMBOL PARAMETER
CONDITIONS
T = 25°C
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
400
800
950
µV
µV
OS
A
0°C ≤ T ≤ 70°C
●
●
A
Input Offset Voltage Drift (Note 7)
Input Offset Current
0°C ≤ T ≤ 70°C
2
4
5
µV/°C
A
I
I
●
●
8
7
nA
µA
OS
V
V
= 18V (Note 3)
= 18V (Note 3)
CM
Input Bias Current
●
●
45
35
0.1
80
60
nA
µA
nA
B
CM
SHDN or V = 0V, V = 0V to 18V
S
CM
Input Bias Current Drift
Input Noise Voltage
0°C ≤ T ≤ 70°C
●
0.06
0.6
nA/°C
A
0.1Hz to 10Hz
f = 1kHz
µV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
20
nV/√Hz
pA/√Hz
n
i
f = 1kHz
0.14
n
R
IN
Differential
Common Mode, V = 0V to (V – 1V)
Common Mode, V = 0V to 18V
0.65
0.3
1.3
1
0.5
MΩ
GΩ
MΩ
CM
CC
CM
C
Input Capacitance
5
pF
V
IN
Input Voltage Range
●
0
18
CMRR
PSRR
Common Mode Rejection Ratio
(Note 3)
V
V
= 0V to V – 1V
= 0V to 18V (Note 6)
●
●
90
68
100
80
dB
dB
CM
CM
CC
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V = 3V to 12.5V, V = V = 1V
●
●
●
90
100
dB
S
CM
O
A
V = 3V, V = 500mV to 2.5V, R = 10k
V = 3V, 0°C ≤ T ≤ 70°C
200
133
1500
V/mV
V/mV
VOL
S
O
L
S
A
V = 5V, V = 500mV to 4.5V, R = 10k
V = 5V, 0°C ≤ T ≤ 70°C
400
250
1500
V/mV
V/mV
S
O
L
S
A
2
LT1783
ELECTRICAL CHARACTERISTICS
VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified.
The ● denotes specifications which apply over the specified temperature range, otherwise specifications are T = 25°C.
A
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
Output Voltage Swing LOW
Output Voltage Swing HIGH
No Load
●
●
●
3
200
330
8
400
600
mV
mV
mV
OL
OH
I
= 5mA
SINK
V = 5V, I
S
= 10mA
SINK
V = 3V, No Load
●
●
2.91
2.6
2.94
2.8
V
V
S
V = 3V, I
S
= 5mA
SOURCE
V = 5V, No Load
●
●
4.91
4.5
4.94
4.74
V
V
S
V = 5V, I
= 10mA
S
SOURCE
I
Short-Circuit Current (Note 2)
V = 3V, Short to GND
5
15
10
30
mA
mA
SC
S
V = 3V, Short to V
S
CC
V = 5V, Short to GND
15
20
30
40
mA
mA
S
V = 5V, Short to V
S
CC
Minimum Supply Voltage
Reverse Supply Voltage
●
●
2.5
2.7
V
V
I = –100µA
S
18
I
I
Supply Current
(Note 4)
210
5
300
350
µA
µA
S
●
●
Supply Current, SHDN
Shutdown Pin Current
V
= 2V, No Load (Note 8)
18
µA
PIN5
V
V
V
= 0.3V, No load (Note 8)
= 2V, No Load (Note 8)
= 5V, No Load (Note 8)
●
●
0.5
2
5
nA
µA
µA
SHDN
PIN5
PIN5
PIN5
8
Shutdown Output Leakage Current
Maximum Shutdown Pin Current
Shutdown Pin Input Low Voltage
Shutdown Pin Input High Voltage
Turn-On Time
V
V
= 2V, No Load (Note 8)
= 18V, No Load (Note 8)
●
●
●
●
0.05
10
1
µA
µA
V
PIN5
PIN5
30
0.3
V
V
(Note 8)
(Note 8)
L
2
V
H
t
t
V
V
= 5V to 0V, R = 10k (Note 8)
25
3
µs
µs
ON
OFF
PIN5
PIN5
L
Turn-Off Time
= 0V to 5V, R = 10k (Note 8)
L
GBW
Gain Bandwidth Product
(Note 3)
f = 5kHz
0°C ≤ T ≤ 70°C
750
600
1250
kHz
kHz
●
●
A
SR
Slew Rate
(Note 5)
A = –1, R = ∞
0.24
0.21
0.42
V/µs
V/µs
V
L
0°C ≤ T ≤ 70°C
A
FPBW
Full-Power Bandwidth (Note 9)
Settling Time
V
= 2V
66
12
kHz
µs
OUT
P-P
t
V = 5V, ∆V
= 2V to 0.1%, A = –1
OUT V
S
S
THD
Distortion
V = 3V, V = 2V , A = 1, R = 10k, f = 1kHz
0.001
%
S
O
P-P
V
L
VS = ±5V, VCM = 0V,VOUT = 0V, for the 6-lead part VSHDN = V–
V
Input Offset Voltage
T = 25°C
500
900
1050
µV
µV
OS
A
0°C ≤ T ≤ 70°C
●
●
●
●
●
A
Input Offset Voltage Drift (Note 7)
Input Offset Current
0°C ≤ T ≤ 70°C
2
4
5
8
µV/°C
nA
A
I
I
OS
Input Bias Current
40
0.06
1
80
nA
B
Input Bias Current Drift
Input Noise Voltage
0°C ≤ T ≤ 70°C
nA/°C
A
0.1Hz to 10Hz
f = 1kHz
µV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
20
0.14
nV/√Hz
pA/√Hz
n
i
f = 1kHz
n
3
LT1783
ELECTRICAL CHARACTERISTICS
VS = ±5V, VCM = 0V,VOUT = 0V, for the 6-lead part VSHDN = V–, unless otherwise specified.
The ● denotes specifications which apply over the specified temperature range, otherwise specifications are T = 25°C.
A
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
R
IN
Input Resistance
Differential
Common Mode, V = –5V to 13V
●
●
0.65
0.3
1.3
0.5
MΩ
MΩ
CM
C
Input Capacitance
5
pF
V
IN
Input Voltage Range
●
●
–5
68
13
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= –5V to 13V
80
dB
CM
A
V = ±4V, R = 10k
0°C ≤ T ≤ 70°C
70
50
160
V/mV
V/mV
VOL
O
L
●
A
V
Output Voltage Swing LOW
Output Voltage Swing HIGH
Short-Circuit Current (Note 2)
No Load
●
●
●
–4.997 –4.992
V
V
V
OL
I
I
= 5mA
= 10mA
–4.8
–4.67
–4.6
–4.4
SINK
SINK
V
No Load
●
●
●
4.91
4.6
4.5
4.94
4.8
4.74
V
V
V
OH
I
I
= 5mA
= 10mA
SOURCE
SOURCE
I
Short to GND
0°C ≤ T ≤ 70°C
18
15
30
mA
mA
SC
●
●
A
PSRR
Power Supply Rejection Ratio
Supply Current
V = ±1.5V to ±9V
S
90
100
230
dB
I
325
375
µA
µA
S
●
●
Supply Current, SHDN
Shutdown Pin Current
V
= –3V, V = ±5V, No Load (Note 8)
6
20
µA
PIN5
S
I
V
V
= –4.7V, V = ±5V, No load (Note 8)
= –3V, V = ±5V, No Load (Note 8)
●
●
0.5
2
nA
µA
SHDN
PIN5
PIN5
S
8
30
1
S
Maximum Shutdown Pin Current
Shutdown Output Leakage Current
Shutdown Pin Input Low Voltage
Shutdown Pin Input High Voltage
Turn-On Time
V
V
= 9V, V = ±9V (Note 8)
●
●
●
●
●
●
10
µA
µA
V
PIN5
PIN5
S
= –7V, V = ±9V, No Load (Note 8)
0.05
S
V
V
V = ±5V (Note 8)
S
–4.7
L
V = ±5V (Note 8)
S
–2.8
V
H
t
t
V
V
= 0V to –5V, R = 10k (Note 8)
25
3
µs
µs
ON
OFF
PIN5
PIN5
L
Turn-Off Time
= –5V to 0V, R = 10k (Note 8)
L
GBW
Gain Bandwidth Product
f = 5kHz
0°C ≤ T ≤ 70°C
800
700
1300
kHz
kHz
●
●
A
SR
Slew Rate
A = –1, R = ∞, V = ±4V, Measured at V = ±2V
0.26
0.23
0.45
V/µs
V/µs
V
L
O
O
0°C ≤ T ≤ 70°C
A
FPBW
Full-Power Bandwidth (Note 9)
Settling Time
V
= 8V
18
10
kHz
OUT
P-P
t
∆V
= 4V to 0.1%, A = 1
µs
S
OUT
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 6: This specification implies a typical input offset voltage of 1.8mV at
= 18V and a maximum input offset voltage of 7.2mV at V = 18V.
V
CM
CM
Note 2: A heat sink may be required to keep the junction temperature
below absolute maximum.
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.
Note 3: V = 5V limits are guaranteed by correlation to V = 3V and
S
S
V = ±5V or V = ±9V tests.
S
S
FPBW = SR/2πV .
P
Note 4: V = 3V limits are guaranteed by correlation to V = 5V and
S
S
Note 10: The LT1783 is guaranteed functional over the operating
temperature range –40°C to 85°C.
V = ±5V or V = ±9V tests.
S
S
Note 5: Guaranteed by correlation to slew rate at V = ±5V, and GBW at
S
V = 3V and V = ±5V tests.
S
S
4
LT1783
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage vs Large Input
Voltage
Supply Current vs Supply Voltage
Minimum Supply Voltage
400
300
300
280
260
240
220
200
180
160
140
120
5
4
3
2
1
0
V
= 5V, 0V
S
T
T
= 125°C
= 25°C
A
A
200
100
T
T
= –55°C
= 25°C
A
0
T
A
= 125°C
5V
–100
–200
–300
–400
+
–
V
IN
T
= –55°C
A
A
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)
TOTAL SUPPLY VOLTAGE (V)
V
(V)
IN
1783 G01
1783 G02
1783 G02a
Input Bias Current vs Common
Mode Voltage
Output Saturation Voltage vs Load
Current (Output High)
Output Saturation Voltage vs Load
Current (Output Low)
1
1
0.1
50000
40000
30000
20000
10000
V
V
= ±2.5V
OD
V
V
= ±2.5V
OD
S
S
= 30mV
= 30mV
T
= 125°C
A
T
= 125°C
A
0.1
250
200
150
100
50
T
= –55°C
A
0.01
0.001
T
= 25°C
T
= –55°C
A
A
T
= 25°C
100µ
T
A
= 25°C
A
T
= 125°C
A
T
= –55°C
0
A
0.01
–50
1µ
10µ
1m
10m
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)
1µ
10µ
100µ
1m
10m
SOURCING LOAD CURRENT (A)
SINKING LOAD CURRENT (A)
1783 G04
1783 G05
1783 G03
Output Saturation Voltage vs
Input Overdrive
Output Short-Circuit Current vs
Temperature
0.1Hz to 10Hz Noise Voltage
100
10
1
55
50
45
40
35
30
V
= ±2.5V
V
= ±5V
S
S
OUTPUT HIGH
SOURCING CURRENT
SINKING CURRENT
OUTPUT LOW
V
= ±2.5V
S
NO LOAD
0
10
20
30
40
50
60
0
1
2
3
4
5
6
7
8
9
10
–50 –25
0
25
50
75 100 125
INPUT OVERDRIVE (mV)
TIME (sec)
TEMPERATURE (°C)
1783 G06
1783 G07
1783 G06a
5
LT1783
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Noise Voltage Density vs
Frequency
Gain and Phase Shift vs
Frequency
Input Noise Current vs Frequency
70
60
120
100
80
70
60
50
40
30
20
10
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= ±2.5V
V
S
= ±2.5V
V
= ±2.5V
S
S
PHASE
50
40
60
30
40
20
20
GAIN
10
0
0
–20
–40
–60
–80
–10
–20
–30
1k
10k
100k
1M
10M
1
10
100
1k
10k
1
10
100
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
1783 G10
1783 G08
1783 G09
Gain Bandwidth Product vs
Temperature
Slew Rate vs Temperature
1400
1350
1300
1250
1200
1150
1100
0.8
0.7
0.6
0.5
0.4
0.3
0.2
f = 5kHz
S
V = ±5V
S
V
= ±2.5V
RISING
FALLING
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
1783 G11
1783 G12
Gain Bandwidth Product and
Phase Margin vs Supply Voltage
Gain Bandwidth and Phase
Margin vs Load Resistance
65
65
60
55
A
= –1
G
V
F
R = R = 10k
PHASE MARGIN
60
55
f = 5kHz
PHASE MARGIN
1400
1200
1000
800
GAIN BANDWIDTH PRODUCT
1300
1250
1200
V
A
= 2.5V
= –1
G
S
V
F
GAIN BANDWIDTH PRODUCT
R = R = 10k
f = 5kHz
0
2
4
6
8
10 12 14 16 18
1k
10k
LOAD RESISTANCE (Ω)
100k
TOTAL SUPPLY VOLTAGE (V)
1783 G14
1783 G13
6
LT1783
U W
TYPICAL PERFOR A CE CHARACTERISTICS
PSRR vs Frequency
CMRR vs Frequency
Output Impedance vs Frequency
90
80
70
60
50
40
30
20
10
0
110
100
90
100
10
V
= ±2.5V
S
V
= ±2.5V
V
= ±2.5V
S
S
A
A
= 100
= 10
V
V
POSITIVE SUPPLY
80
70
1
0.1
60
NEGATIVE SUPPLY
50
A
= 1
V
40
–10
30
10k
0.01
1k
10k
100k
1M
100k
FREQUENCY (Hz)
1M
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
1783 G15
1783 G17
1783 G16
Disabled Output Impedance vs
Frequency (Note 8)
Settling Time to 0.1% vs Output
Step
Capacitive Load Handling
Overshoot vs Capacitive Load
40
35
30
25
20
15
10
5
1M
4
3
V
V
= 5V, 0V
CM
S
= 2.5V
A
= 1
A = –1
V
V
100k
10k
1k
2
1
V
= ±5V
0
S
A
A
= 1
V
–1
–2
–3
–4
A
= 1
A = –1
V
= 5
A = 10
V
V
V
V
V
= ±2.5V
PIN5
S
(SHUTDOWN) = 2.5V
0
100
100
10
100
1000
10000
1k
10k
100k
1M
0
2
4
6
8
10 12 14 16 18 20
FREQUENCY (Hz)
CAPACITIVE LOAD (pF)
SETTLING TIME (µs)
1783 G19
1783 G17a
1783 G18
Undistorted Output Swing vs
Frequency
Total Harmonic Distortion + Noise
vs Frequency
Total Harmonic Distortion + Noise
vs Load Resistance
1
1
12
10
8
V
= 3V TOTAL
V
V
V
= 3V, 0V
= 2V
CM
= 10k
S
S
OUT
V
= ±5V
S
A
= 1
V
P-P
V
V
= ±1.5V
= ±1V
V
= 2V AT 1kHz
P-P
= 1.2V
S
IN
IN
0.1
0.1
R
L
6
0.01
0.001
0.010
0.001
A
A
= –1
= 1
V
V
V
= 3V, 0V
IN
S
V
= ±2.5V
S
= 0.5V TO 2.5V
4
V
V
= 3V, 0V
= 0.2V TO 2.2V
S
IN
2
V
DISTORTION ≤ 1%
= 1
A
V
0.0001
0
0.0001
100
1k
10k
100k
100
1k
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
LOAD RESISTANCE TO GROUND (Ω)
1783 G20
1783 G22
1783 G21
7
LT1783
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Total Harmonic Distortion + Noise
vs Output Voltage Amplitude
Supply Current vs SHDN Pin
Voltage
Open-Loop Gain
10
1
275
250
225
200
175
150
125
100
75
V
= ±5V
S
V
= 5V, 0V
A
= –1
S
V
F
S
T = 125°C
A
R
V
= R = 100k
G
R
R
= 2k
= ±1.5V
L
V
= 0V
CM
T
= 25°C
A
= 10k
A
= –1
G
L
V
F
S
R
V
= R = 100k
= 3V, 0V
= 1.5V
0.1
0.01
T
= –55°C
A
R
L
= 50k
V
CM
A
V
V
= 1
V
S
= 3V, 0V
= 1.5V
CM
A
V
V
= 1
V
S
50
= ±1.5V
= 0V
CM
25
0.001
0
–6 –5 –4 –3 –2 –1
0
1
2
3
4
5
6
0
1
2
3
0
0.5
1
1.5
2
2.5
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE AMPLITUDE (V
)
P-P
SHUTDOWN PIN VOLTAGE (V)
1783 G23
1783 G24
1783 G25
Small-Signal Response
Large-Signal Response
VS = ±5V
AV = 1
1783 G27
VS = ±5V
AV = 1
1783 G26
CL = 15pF
CL = 15pF
U
W U U
APPLICATIO S I FOR ATIO
Supply Voltage
Inputs
The positive supply pin of the LT1783 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 LT1783 has two input stages, NPN and PNP (see the
Simplified Schematic), resulting in three distinct operat-
ingregionsasshownintheInputBiasCurrentvsCommon
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
0.5Vofthepositiverail, theNPNstageisoperatingandthe
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
LT1783
U
W U U
APPLICATIO S I FOR ATIO
input bias current is typically 80nA. Increases in tempera-
ture 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.
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.IftheopampisoperatinginthePNPinputstage
(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 Character-
istics curves, “Total Harmonic Distortion + Noise vs Out-
put Voltage Amplitude.”
A Schottky diode in the collector of the input transistors,
along with special geometries for these NPN transistors,
allowtheLT1783tooperatewitheitherorbothofitsinputs
above V+. At about 0.3V above V+, the NPN input transis-
tor is fully saturated and the input bias current is typically
30µA at room temperature. The input offset voltage is
typically1.8mVwhenoperatingaboveV+.TheLT1783will
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.
TheinputstageoftheLT1783incorporatesphasereversal
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.
Gain
The open-loop gain is almost independent of load when
the output is sourcing current. This optimizes perfor-
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.
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.
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 5µA and the output
leakage current is less than 1µA (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.”
The LT1783 is internally compensated to drive at least
400pF 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
amplifiersforlargercapacitiveloads, upto10,000pF, atall
output currents.
9
LT1783
W
W
SI PLIFIED SCHE ATIC
+
V
Q2
Q1
Q3
Q22
D1
Q8
D3
SHDN
J1
R1
6k
R2
1k
Q19
Q4
–IN
+IN
Q17
Q18
Q20
+
OUT
Q7
Q11 Q12
R3
1k
10µA
Q16
Q15
Q9
Q10
Q26
Q13
Q14
Q21
R4
8k
R5
8k
Q25 Q23
Q24
Q5
Q6
D4
D5
–
V
1783 SS
U
PACKAGE DESCRIPTIO
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)
0.95
(0.037)
REF
1.90
(0.074)
REF
2.60 – 3.00
(0.102 – 0.118)
1.50 – 1.75
(0.059 – 0.069)
0.00 – 0.15
(0.00 – 0.006)
0.90 – 1.45
(0.035 – 0.057)
0.35 – 0.55
(0.014 – 0.022)
0.35 – 0.50
(0.014 – 0.020)
FIVE PLACES (NOTE 2)
0.90 – 1.30
(0.035 – 0.051)
S5 SOT-23 0599
0.09 – 0.20
(0.004 – 0.008)
(NOTE 2)
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)
10
LT1783
U
PACKAGE DESCRIPTIO
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
0.95
1.90
(0.074)
REF
(0.037)
REF
2.6 – 3.0
(0.110 – 0.118)
1.50 – 1.75
(0.059 – 0.069)
0.00 – 0.15
(0.00 – 0.006)
0.90 – 1.45
(0.035 – 0.057)
0.35 – 0.55
(0.014 – 0.022)
0.35 – 0.50
(0.014 – 0.020)
SIX PLACES (NOTE 2)
0.90 – 1.30
(0.035 – 0.051)
S6 SOT-23 0898
0.09 – 0.20
(0.004 – 0.008)
(NOTE 2)
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1783
U
TYPICAL APPLICATIO S
Current Source
V
CC
LT1634-1.25
R1
+
2N3906
LT1783
–
1.25V
R1
I
=
OUT
1783 TA02
Protected Fault Conditions
OK!
–18V
OK!
5V
+
+
V
V
LT1783
LT1783
+
24V
REVERSE BATTERY
INPUT OVERVOLTAGE
OK!
5V
OK!
5V
+
18V
LT1783
LT1783
10V
+
INPUT DIFFERENTIAL VOLTAGE
INPUTS BELOW GROUND
1783 TA03
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1782
Micropower, Over-The-Top SOT-23 Rail-to-Rail Input
and Output Op Amp
SOT-23 Package, Micropower 40µA per Amplifier, Rail-to-Rail Input
and Output , 200kHz GBW
LT1490/LT1491
LT1636
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
Single Over-The-Top Micropower Rail-to-Rail Input
and Output Op Amp
55µA Supply Current, V Extends 44V Above V , Independent of
CM EE
V
, MSOP Package, Shutdown Function
CC
LT1638/LT1639
Dual/Quad, 1.2MHz, 0.4V/µs, Over-The-Top Micropower
Rail-to-Rail Input and Output Op Amps
170µA Supply Current, Single Supply Input Range: –0.4V to 44V,
Rail-to-Rail Input and Output
1783f LT/TP 0400 4K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1999
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