LT1783 - 1.25MHz, Over-The-Top Micropower, Rail-to

LT1783 - 1.25MHz, Over-The-Top Micropower, Rail-to
LT1783
1.25MHz, Over-The-Top
Micropower, Rail-to-Rail Input
and Output Op Amp in SOT-23
DESCRIPTION
FEATURES
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Operates with Inputs Above V+
Rail-to-Rail Input and Output
Micropower: 300μA Supply Current Max
Operating Temperature Range: –40°C to 125°C
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
Low Profile (1mm) ThinSOT™ Package
APPLICATIONS
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Portable Instrumentation
Battery- or Solar-Powered Systems
Sensor Conditioning
Supply Current Sensing
Battery Monitoring
MUX Amplifiers
4mA to 20mA Transmitters
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.
The input range of the LT1783 includes ground, and a
unique feature of this device is its Over-The-Top® 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 5μA. The
LT1783 op amp is available in the 5- and 6-lead SOT-23
packages. For applications requiring lower power, refer
to the LT1782.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Over-The-Top are registered
trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Positive Supply Rail Current Sense
Distribution of Input Offset Voltage
25
200Ω
5V
0.2Ω
200Ω
LOAD
ILOAD
+
LT1783
2N3904
–
VOUT = 2Ω(ILOAD)
0V TO 4.3V
2k
1783 TA01
PERCENTAGE OF AMPLIFIERS
V+
5V TO 18V
VS = 5V, 0V
VCM = 2.5V
20
15
10
5
0
–900
–600 –300
0
300
600
INPUT OFFSET VOLTAGE (μV)
900
1783 TA01b
1783fd
1
LT1783
ABSOLUTE MAXIMUM RATINGS (Note 1)
Total Supply Voltage (V+ to V –) ................................ 18V
Input Differential Voltage.......................................... 18V
Input Pin Voltage to V – ............................... +24V/–10V
Shutdown Pin Voltage Above V – ............................. 18V
Shutdown Pin Current ........................................ ±10mA
Output Short-Circuit Duration (Note 2) ........... Indefinite
Operating Temperature Range (Note 3)
LT1783C ............................................. –40°C to 85°C
LT1783I .............................................. –40°C to 85°C
LT1783H ........................................... –40°C to 125°C
Specified Temperature Range (Note 4)
LT1783C ............................................. –40°C to 85°C
LT1783I .............................................. –40°C to 85°C
LT1783H ........................................... –40°C to 125°C
Junction Temperature ......................................... 150°C
Storage Temperature Range.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................. 300°C
PIN CONFIGURATION
TOP VIEW
5 V
OUT 1
V– 2
TOP VIEW
+
V– 2
+ –
+IN 3
+
6 V
OUT 1
+IN 3
4 –IN
+ –
5 SHDN
4 –IN
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 250°C/W
TJMAX = 150°C, θJA = 230°C/W
ORDER INFORMATION
TAPE AND REEL (MINI)
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LT1783CS5#TRMPBF
LT1783CS5#TRPBF
LTLF
5-Lead Plastic SOT-23
0°C to 70°C
LT1783IS5#TRMPBF
LT1783IS5#TRPBF
LTLG
5-Lead Plastic SOT-23
–40°C to 85°C
LT1783HS5#TRMPBF
LT1783HS5#TRPBF
LTXR
5-Lead Plastic SOT-23
–40°C to 125°C
LT1783CS6#TRMPBF
LT1783CS6#TRPBF
LTIU
6-Lead Plastic SOT-23
0°C to 70°C
LT1783IS6#TRMPBF
LT1783IS6#TRPBF
LTIV
6-Lead Plastic SOT-23
–40°C to 85°C
LT1783HS6#TRMPBF
LT1783HS6#TRPBF
LTXS
6-Lead Plastic SOT-23
–40°C to 125°C
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on 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/
1783fd
2
LT1783
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. 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
CONDITIONS
VOS
Input Offset Voltage
TA = 25°C
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
IOS
Input Offset Voltage Drift (Note 9)
Input Offset Current
Input Bias Current
VCM = 18V (Note 5)
SHDN or VS = 0V, VCM = 0V to 18V
en
in
RIN
CIN
CMRR
PSRR
AVOL
Input Bias Current Drift
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
(Note 5)
Power Supply Rejection Ratio
Large-Signal Voltage Gain
VOL
Output Voltage Swing LOW
VOH
Output Voltage Swing HIGH
ISC
IS
ISHDN
Short-Circuit Current (Note 2)
Minimum Supply Voltage
Reverse Supply Voltage
Supply Current
(Note 6)
Supply Current, SHDN
Shutdown Pin Current
Shutdown Output Leakage Current
Maximum Shutdown Pin Current
l
l
2
4
l
l
l
l
l
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, VCM = 0V to (VCC – 1V)
Common Mode, VCM = 0V to 18V
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, 0°C ≤ TA ≤ 70°C
VS = 3V, –40°C ≤ TA ≤ 85°C
VS = 5V, VO = 500mV to 4.5V, RL = 10k
VS = 5V, 0°C ≤ TA ≤ 70°C
VS = 5V, –40°C ≤ TA ≤ 85°C
No Load
ISINK = 5mA
VS = 5V, ISINK = 10mA
VS = 3V, No Load
VS = 3V, ISOURCE = 5mA
VS = 5V, No Load
VS = 5V, ISOURCE = 10mA
VS = 3V, Short to GND
VS = 3V, Short to VCC
VS = 5V, Short to GND
VS = 5V, Short to VCC
l
0.65
l
0.3
l
0
90
68
90
200
133
100
400
250
200
l
l
l
l
l
l
l
l
l
l
l
l
l
l
2.91
2.6
4.91
4.5
5
15
15
20
l
IS = –100μA
l
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
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)
l
l
l
l
l
l
l
LT1783C/LT1783I
TYP
MAX
400
l
VCM = 18V (Note 5)
IB
MIN
45
35
0.1
0.06
0.6
20
0.14
1.3
1
0.5
5
800
950
1100
5
8
7
80
60
18
100
80
100
1500
1500
3
200
330
2.94
2.8
4.94
4.74
10
30
30
40
2.5
8
400
600
210
300
350
375
18
2.7
18
5
0.5
2
5
0.05
10
8
1
30
UNITS
μV
μV
μV
μV/°C
nA
μA
nA
μA
nA
nA/°C
μVP-P
nV/√Hz
pA/√Hz
MΩ
GΩ
MΩ
pF
V
dB
dB
dB
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
mV
mV
mV
V
V
V
V
mA
mA
mA
mA
V
V
μA
μA
μA
μA
nA
μA
μA
μA
μA
1783fd
3
LT1783
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. 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
CONDITIONS
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)
(Note 10)
(Note 10)
VPIN5 = 5V to 0V, RL = 10k (Note 10)
VPIN5 = 0V to 5V, RL = 10k (Note 10)
f = 5kHz
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
SR
Slew Rate
(Note 7)
FPBW
tS
Full-Power Bandwidth (Note 11)
Settling Time
AV = –1, RL = ∞
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
VOUT = 2VP-P
THD
Distortion
MIN
LT1783C/LT1783I
TYP
MAX
l
l
l
l
l
l
0.3
2
750
600
550
0.24
0.21
0.19
VS = 5V, ΔVOUT = 2V to 0.1%, AV = –1
VS = 3V, VO = 2VP-P , AV = 1, RL = 10k, f = 1kHz
25
3
1250
0.42
UNITS
V
V
μs
μs
kHz
kHz
kHz
V/μs
V/μs
V/μs
66
12
kHz
μs
0.001
%
The l denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C.
VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V –, pulse power tested unless otherwise specified. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
TA = 25°C
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
IOS
IB
en
in
RIN
CIN
Input Offset Voltage Drift (Note 9)
Input Offset Current
Input Bias Current
Input Bias Current Drift
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
CMRR
AVOL
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
Large-Signal Voltage Gain
VOL
Output Voltage Swing LOW
VOH
Output Voltage Swing HIGH
ISC
Short-Circuit Current (Note 2)
PSRR
Power Supply Rejection Ratio
LT1783C/LT1783I
MIN
TYP
MAX
500
l
l
l
l
l
l
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, VCM = –5V to 13V
VCM = –5V to 13V
VO = ±4V, RL= 10k
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
No Load
ISINK = 5mA
ISINK = 10mA
No Load
ISOURCE = 5mA
ISOURCE = 10mA
Short to GND
0°C ≤ TA ≤ 70°C
VS = ±1.5V to ±9V
l
l
0.65
0.3
l
–5
68
70
50
40
l
l
l
l
l
l
l
l
l
l
l
4.91
4.6
4.5
18
15
90
2
4
40
0.06
1
20
0.14
1.3
0.5
5
900
1050
1200
5
8
80
13
80
160
–4.997
–4.8
–4.67
4.94
4.8
4.74
30
100
–4.992
–4.6
–4.4
UNITS
μV
μV
μV
μV/°C
nA
nA
nA/°C
μVP-P
nV/√Hz
pA/√Hz
MΩ
MΩ
pF
V
dB
V/mV
V/mV
V/mV
V
V
V
V
V
V
mA
mA
dB
1783fd
4
LT1783
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, VCM = 0V, VOUT = 0V, for the 6-lead part VPIN5 = V –,
pulse power tested unless otherwise specified. (Note 4)
SYMBOL
PARAMETER
IS
Supply Current
ISHDN
Supply Current, SHDN
Shutdown Pin Current
VL
VH
tON
tOFF
GBW
Maximum Shutdown Pin Current
Shutdown Output Leakage Current
Shutdown Pin Input Low Voltage
Shutdown Pin Input High Voltage
Turn-On Time
Turn-Off Time
Gain Bandwidth Product
SR
Slew Rate
FPBW
tS
Full-Power Bandwidth (Note 11)
Settling Time
LT1783C/LT1783I
MIN
TYP
MAX
CONDITIONS
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
VPIN5 = –3V, VS = ±5V, No Load (Note 10)
VPIN5 = –4.7V, VS = ±5V, No Load (Note 10)
VPIN5 = –3V, VS = ±5V, No Load (Note 10)
VPIN5 = 9V, VS = ±9V (Note 10)
VPIN5 = –7V, VS = ±9V, No Load (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
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
AV = –1, RL = ∞, VO = ±4V, Measured at VO = ±2V
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
VOUT = 8VP-P
230
l
l
l
6
0.5
2
10
0.05
l
l
l
l
l
l
l
l
8
30
1
–4.7
–2.8
l
l
l
325
375
400
20
800
700
625
0.26
0.23
0.21
25
3
1300
0.45
18
10
ΔVOUT = 4V to 0.1%, AV = 1
UNITS
μA
μA
μA
μA
nA
μA
μA
μA
V
V
μs
μs
kHz
kHz
kHz
V/μs
V/μs
V/μs
kHz
μs
The l denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C. VS = 3V, 0V; VS = 5V, 0V;
VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. (Note 4)
SYMBOL
PARAMETER
VOS
Input Offset Voltage
CONDITIONS
IB
LT1783H
TYP
MAX
UNITS
850
3
μV
mV
l
15
μV/°C
VCM = 18V (Note 5)
l
l
15
10
nA
μA
VCM = 18V (Note 5)
l
l
150
150
nA
μA
400
l
Input Offset Voltage Drift (Note 9)
IOS
MIN
Input Offset Current
Input Bias Current
Input Voltage Range
CMRR
Common Mode Rejection Ratio
VCM = 0.3V to VCC – 1V
VCM = 0.3V to 18V
AVOL
Large-Signal Voltage Gain
VS = 3V, VO = 500mV to 2.5V, RL = 10k
VS = 5V, VO = 500mV to 4.5V, RL = 10k
l
0.3
l
l
76
60
l
200
50
1500
V/mV
V/mV
l
400
100
1500
V/mV
V/mV
18
V
dB
dB
VOL
Output Voltage Swing LOW
No Load
ISINK = 5mA
VS = 5V, ISINK = 10mA
l
l
l
VOH
Output Voltage Swing HIGH
VS = 3V, No Load
VS = 3V, ISOURCE = 5mA
l
l
2.85
2.30
V
V
VS = 5V, No Load
VS = 5V, ISOURCE = 10mA
l
l
4.85
4
V
V
VS = 3V to 12.5V, VCM = VO = 1V
l
80
PSRR
Power Supply Rejection Ratio
15
800
1200
mV
mV
mV
dB
1783fd
5
LT1783
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range of –40°C ≤ TA ≤ 125°C. 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
CONDITIONS
Minimum Supply Voltage
Reverse Supply Voltage
IS
ISHDN
IS = –100μA
Supply Current
MIN
l
2.7
l
18
VPIN5 = 2V, No Load (Note 10)
l
Shutdown Pin Current
VPIN5 = 0.3V, No Load (Note 10)
VPIN5 = 2V, No Load (Note 10)
l
l
MAX
UNITS
V
V
210
l
Supply Current, SHDN
LT1783H
TYP
300
600
μA
μA
25
μA
12
nA
μA
0.5
Output Leakage Current
VPIN5 = 2V, No Load (Note 10)
l
2.5
μA
Maximum Shutdown Pin Current
VPIN5 = 18V, No Load (Note 10)
l
40
μA
GBW
Gain Bandwidth Product
f = 5kHz (Note 5)
SR
Slew Rate
AV = –1, RL = ∞ (Note 7)
l
750
400
1250
kHz
kHz
l
0.24
0.12
0.42
V/μs
V/μs
The l denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C. VS = ±5V, VCM = 0V,
VOUT = 0V, VSHDN = V –, TA = –40°C to 125°C, for the 6-lead part VPIN5 = V–, pulse power tested unless otherwise specified. (Note 4)
SYMBOL
PARAMETER
VOS
Input Offset Voltage
CONDITIONS
MIN
LT1783H
TYP
500
l
MAX
UNITS
950
3.1
μV
mV
15
μV/°C
Input Offset Voltage Drift (Note 9)
l
IOS
Input Offset Current
l
15
nA
IB
Input Bias Current
l
150
nA
CMRR
Common Mode Rejection Ratio
VCM = –4.7V to 13V
AVOL
Large-Signal Voltage Gain
VO = ±4V, RL = 10k
VO
Output Voltage Swing
PSRR
Power Supply Rejection Ratio
l
60
l
70
10
No Load
IOUT = ±5mA
IOUT = ±10mA
l
l
l
±4.85
±4.20
±3.80
V
V
V
VS = ±1.5V to ±9V
l
80
dB
l
±1.35
V
Minimum Supply Voltage
IS
ISHDN
Supply Current
dB
160
230
l
V/mV
V/mV
325
650
μA
μA
25
μA
12
nA
μA
Supply Current, SHDN
VPIN5 = –3V, VS = ±5V, No Load (Note 10)
l
Shutdown Pin Current
VPIN5 = –4.7V, VS = ±5V, No Load (Note 10)
VPIN5 = –3V, VS = ±5V, No Load (Note 10)
l
l
Maximum Shutdown Pin Current
VPIN5 = 9V, VS = ±9V (Note 10)
l
45
μA
Output Leakage Current
VPIN5 = –7V, VS = ±9V, No Load
l
3
μA
0.5
VL
Shutdown Pin Input Low Voltage
VS = ±5V
l
VH
Shutdown Pin Input High Voltage
VS = ±5V
l
–2.8
GBW
Gain Bandwidth Product
f = 5kHz
l
800
425
1300
kHz
kHz
SR
Slew Rate
AV = –1, RL = ∞, VO = 4V
Measured at VO = ±2V
l
0.26
0.14
0.45
V/μs
V/μs
–4.7
V
V
1783fd
6
LT1783
ELECTRICAL CHARACTERISTICS
Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and
VS = ±5V or VS = ±9V tests.
Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and
VS = ±5V or VS = ±9V tests.
Note 7: Guaranteed by correlation to slew rate at VS = ±5V, and GBW at
VS = 3V and VS = ±5V tests.
Note 8: This specification implies a typical input offset voltage of 1.8mV at
VCM = 18V and a maximum input offset voltage of 7.2mV at VCM = 18V.
Note 9: This parameter is not 100% tested.
Note 10: Specifications apply to 6-lead SOT-23 with shutdown.
Note 11: Full-power bandwidth is calculated from the slew rate:
FPBW = SR/2πVP .
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 LT1783C and LT1873I are guaranteed functional over the
operating temperature range of –40°C to 85°C. The LT1783H is guaranteed
functional over the operating temperature range of –40°C to 125°C.
Note 4: The LT1783C is guaranteed to meet specified performance from
0°C to 70°C. The LT1783C 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 LT1783I is guaranteed to meet
specified performance from –40°C to 85°C. The LT1783H is guaranteed to
meet specified performance from –40°C to 125°C.
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
300
240
TA = 25°C
220
200
180
TA = –55°C
160
140
100
TA = –55°C
0
TA = 125°C
–100
4
6
8
10 12 14
SUPPLY VOLTAGE (V)
16
0
1
2
3
4
TOTAL SUPPLY VOLTAGE (V)
10000
250
TA = –55°C
150
100
TA = 25°C
TA = 125°C
OUTPUT SATURATION VOLTAGE (V)
INPUT BIAS CURRENT (nA)
Output Saturation Voltage
vs Load Current (Output Low)
1
VS = ±2.5V
VOD = 30mV
40000
0
1783 G03
1
50000
–50
0
–10–8 –6 –4 –2 0 2 4 6 8 10 12 14 16 18
VIN (V)
5
Output Saturation Voltage
vs Load Current (Output High)
20000
+
–
1783 G02
Input Bias Current
vs Common Mode Voltage
50
VIN
1
18
30000
5V
2
–300
1783 G01
200
3
TA = 25°C
–200
–400
2
VS = 5V, 0V
4
200
OUTPUT SATURATION VOLTAGE (V)
SUPPLY CURRENT (μA)
TA = 125°C
260
5
300
VOUT (V)
INPUT OFFSET VOLTAGE CHANGE (μV)
400
280
120
Output Voltage
vs Large Input Voltage
Minimum Supply Voltage
TA = 125°C
0.1
TA = –55°C
TA = 25°C
VS = ±2.5V
VOD = 30mV
TA = 125°C
0.1
0.01
TA = 25°C
TA = –55°C
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 G04
0.01
1μ
0.001
10μ
100μ
1m
SOURCING LOAD CURRENT (A)
10m
1783 G05
1μ
100μ
1m
10μ
SINKING LOAD CURRENT (A)
10m
1783 G06
1783fd
7
LT1783
TYPICAL PERFORMANCE CHARACTERISTICS
Output Saturation Voltage
vs Input Overdrive
Output Short-Circuit Current
vs Temperature
55
0.1Hz to 10Hz Noise Voltage
VS = ±2.5V
VS = ±5V
OUTPUT HIGH
10
OUTPUT LOW
NOISE VOLTAGE (400nV/DIV)
50
OUTPUT CURRENT (mA)
OUTPUT SATURATION VOLTAGE (mV)
100
SOURCING CURRENT
45
40
SINKING CURRENT
35
VS = ±2.5V
NO LOAD
1
0
10
20
30
40
50
INPUT OVERDRIVE (mV)
30
–50
60
–25
0
25
50
75
TEMPERATURE (°C)
100
1783 G07
40
30
20
1
10
100
1k
FREQUENCY (Hz)
10k
2.0
1.5
1.0
0.5
0
9
10
1
100
1k
FREQUENCY (Hz)
10k
10
120
100
80
40
60
30
40
20
20
GAIN
10
0
0
–20
–10
–40
–20
–60
–30
1k
10k
100k
1M
FREQUENCY (Hz)
–80
10M
1783 G12
1783 G11
Slew Rate vs Temperature
0.8
VS = ±5V
0.7
SLEW RATE (V/μs)
GAIN BANDWIDTH (kHz)
8
PHASE
50
f = 5kHz
VS = ±2.5V
1300
1250
1200
1150
1100
–50
7
VS = ±2.5V
60
2.5
Gain Bandwidth Product
vs Temperature
1350
4 5 6
TIME (sec)
70
VS = ±2.5V
1783 G10
1400
3
Gain and Phase Shift
vs Frequency
GAIN (dB)
INPUT NOISE CURRENT DENSITY (pA/√Hz)
50
2
PHASE SHIFT (DEG)
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
3.0
VS = ±2.5V
1
1783 G09
Input Noise Current vs Frequency
60
10
0
1783 G08
Noise Voltage Density
vs Frequency
70
125
RISING
0.6
0.5
FALLING
0.4
0.3
–25
0
25
50
75
TEMPERATURE (°C)
100
125
1783 G13
0.2
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
1783 G14
1783fd
8
LT1783
TYPICAL PERFORMANCE CHARACTERISTICS
Gain Bandwidth Product and
Phase Margin vs Supply Voltage
Gain Bandwidth and Phase
Margin vs Load Resistance
PHASE MARGIN
PHASE
MARGIN (DEG)
60
65
60
PHASE MARGIN
55
PHASE
MARGIN (DEG)
65
AV = –1
RF = RG = 10k
f = 5kHz
GAIN BAINDWIDTH
PRODUCT (kHz)
55
GAIN BAINDWIDTH
PRODUCT (kHz)
1300
GAIN BANDWIDTH PRODUCT
1250
1200
0
2
4
6
8 10 12 14 16
TOTAL SUPPLY VOLTAGE (V)
1400
GAIN BANDWIDTH PRODUCT
1200
VS = 2.5V
AV = –1
RF = RG = 10k
f = 5kHz
1000
800
1k
18
10k
LOAD RESISTANCE (Ω)
100k
1783 G16
1783 G15
PSRR vs Frequency
VS = ±2.5V
70
60
POSITIVE SUPPLY
50
40
30
NEGATIVE SUPPLY
20
10
0
–10
10k
100k
FREQUENCY (Hz)
1k
Output Impedance vs Frequency
100
AV = 100
90
80
70
60
50
10
AV = 10
1
0.1
AV = 1
40
30
10k
1M
VS = ±2.5V
VS = ±2.5V
100
OUTPUT IMPEDANCE (Ω)
80
CMRR vs Frequency
110
COMMON MODE REJECTION RATIO (dB)
POWER SUPPLY REJECTION RATIO (dB)
90
100k
FREQUENCY (Hz)
0.01
100
1M
1k
10k
100k
FREQUENCY (Hz)
1783 G17
1783 G19
1783 G18
Disabled Output Impedance
vs Frequency (Note 8)
1M
Settling Time to 0.1%
vs Output Step
40
VS = 5V, 0V
35 VCM = 2.5V
VS = ±5V
3
AV = 1
AV = –1
2
10k
30
OVERSHOOT (%)
100k
OUTPUT STEP (V)
OUTPUT IMPEDANCE (Ω)
Capacitive Load Handling
Overshoot vs Capacitive Load
4
VS = ±2.5V
VPIN5 (SHUTDOWN) = 2.5V
1
0
–1
AV = 1
10k
100k
FREQUENCY (Hz)
1M
1783 G20
AV = 1
15
AV = 5
5
AV = 10
0
–4
1k
20
AV = –1
–3
100
100
25
10
–2
1k
1M
0
2
4
6 8 10 12 14 16 18 20
SETTLING TIME (μs)
1783 G21
10
100
1000
CAPACITIVE LOAD (pF)
10000
1783 G22
1783fd
9
LT1783
TYPICAL PERFORMANCE CHARACTERISTICS
Total Harmonic Distortion + Noise
vs Frequency
1
12
THD + NOISE (%)
6
VS = ±2.5V
4
0.010
AV = –1
0.001
2
100k
10
100
1k
10k
FREQUENCY (Hz)
100k
1783 G23
AV = –1
RF = RG = 100k
VS = ±1.5V
VCM = 0V
THD + NOISE (%)
AV = –1
RF = RG = 100k
VS = 3V, 0V
VCM = 1.5V
AV = 1
VS = 3V, 0V
VCM = 1.5V
0.01
AV = 1
VS = ±1.5V
VCM = 0V
0.001
0
1
2
OUTPUT VOLTAGE AMPLITUDE (VP-P)
1k
10k
LOAD RESISTANCE TO GROUND (Ω)
3
1783 G25
275
RL = 2k
RL = 10k
RL = 50k
–6 –5 –4 –3 –2 –1 0 1 2 3
OUTPUT VOLTAGE (V)
4
5
6
VS = 5V, 0V
250
TA = 125°C
225
200
TA = 25°C
175
150
TA = –55°C
125
100
75
50
25
0
0
0.5
1
1.5
2
SHUTDOWN PIN VOLTAGE (V)
1783 G27
Large-Signal Response
100k
Supply Current
vs SHDN Pin Voltage
VS = ±5V
1783 G26
VS = ±5V
AV = 1
CL = 15pF
0.0001
100
Open-Loop Gain
INPUT OFFSET VOLTAGE CHANGE (50μV/DIV)
10
0.1
VS = 3V, 0V
VIN = 0.2V TO 2.2V
1783 G24
Total Harmonic Distortion + Noise
vs Output Voltage Amplitude
1
VS = 3V, 0V
VIN = 0.5V TO 2.5V
0.001
0.0001
1k
10k
FREQUENCY (Hz)
VS = 3V TOTAL
AV = 1
VIN = 2VP-P AT 1kHz
0.01
AV = 1
DISTORTION ≤ 1%
AV = 1
0
100
VS = ±1.5V
VIN = ±1V
0.1
SUPPLY CURRENT PER AMPLIFIER (μA)
OUTPUT SWING (VP-P)
0.1
8
1
VS = 3V, 0V
VOUT = 2VP-P
VCM = 1.2V
RL = 10k
VS = ±5V
10
Total Harmonic Distortion + Noise
vs Load Resistance
THD + NOISE (%)
Undistorted Output Swing
vs Frequency
2.5
1783 G28
Small-Signal Response
1783 G29
VS = ±5V
AV = 1
CL = 15pF
1783 G30
1783fd
10
LT1783
APPLICATIONS INFORMATION
Supply Voltage
Output
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 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 protected against reverse-battery voltages
up to 18V. In the event a reverse-battery condition occurs,
the supply current is less than 1nA.
Inputs
The LT1783 has two input stages, NPN and PNP (see the
Simplified Schematic), resulting in three distinct operating
regions as shown in the Input Bias Current vs Common
Mode typical performance curve.
For input voltages about 0.8V or more below V+, the PNP
input stage is active and the input bias current is typically
–40nA. When the input common mode voltage is within
0.5V of the positive rail, the NPN stage is operating and
the input bias current is typically 80nA. Increases in temperature will cause the voltage at which operation switches
from the PNP input stage to the NPN input stage to move
towards V+. The input offset voltage of the NPN stage is
untrimmed and is typically 1.8mV.
A Schottky diode in the collector of the input transistors,
along with special geometries for these NPN transistors,
allow the LT1783 to operate with either or both of its inputs
above V+. At about 0.3V above V+, the NPN input transistor
is fully saturated and the input bias current is typically 30μA
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.
The LT1783 is internally compensated to drive at least
400pF of capacitance under any output loading conditions. 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.
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.”
1783fd
11
LT1783
APPLICATIONS INFORMATION
Gain
Shutdown
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 operation, the SHDN pin can be tied to V– or left floating. See
the Typical Performance Characteristics curves, “Supply
Current vs Shutdown Voltage.”
SIMPLIFIED SCHEMATIC
V+
Q2
Q1
Q3
SHDN
R1
6k
R2
1k
Q4
Q19
–IN
Q17
+
J1
Q7
R3
1k
10μA
Q8
Q11
OUT
Q16
Q9
Q5
Q18
Q15
Q26
Q24
Q20
Q12
+IN
Q25 Q23
Q22
D3
D1
Q6
D4
D5
Q10
Q13
Q14
R4
8k
Q21
R5
8k
V–
1783 SS
1783fd
12
LT1783
TYPICAL APPLICATION
Protected Fault Conditions
OK!
–18V
OK!
5V
V+
V+
LT1783
LT1783
+
24V
REVERSE BATTERY
18V
5V
+
OK!
LT1783
LT1783
10V
INPUT DIFFERENTIAL VOLTAGE
5V
+
OK!
INPUT OVERVOLTAGE
INPUTS BELOW GROUND
1783 TA02
1783fd
13
LT1783
PACKAGE DESCRIPTION
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
0.62
MAX
0.95
REF
2.90 BSC
(NOTE 4)
1.22 REF
1.4 MIN
3.85 MAX 2.62 REF
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
0.01 – 0.10
1.00 MAX
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
(NOTE 3)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
1.90 BSC
S5 TSOT-23 0302 REV B
1783fd
14
LT1783
PACKAGE DESCRIPTION
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.62
MAX
2.90 BSC
(NOTE 4)
0.95
REF
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
0.01 – 0.10
1.00 MAX
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
(NOTE 3)
1.90 BSC
S6 TSOT-23 0302 REV B
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
1783fd
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.
15
LT1783
TYPICAL APPLICATION
Current Source
VCC
LT1634-1.25
R1
+
LT1783
2N3906
–
IOUT =
1.25V
R1
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
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
170μA Supply Current, Single Supply Input Range: –0.4V to 44V,
Rail-to-Rail Input and Output
1783fd
16 Linear Technology Corporation
LT 0609 REV D • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 1999
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