FEATURES
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LT1880
SOT-23, Rail-to-Rail Output,
Picoamp Input Current
Precision Op Amp
DESCRIPTION
The LT
®
1880 op amp brings high accuracy input perfor-
mance and rail-to-rail output swing to the SOT-23 package.
Input offset voltage is trimmed to less than 150μV and
the low drift maintains this accuracy over the operating
temperature range. Input bias current is an ultralow 900pA
maximum.
The amplifier works on any total power supply voltage
between 2.7V and 36V (fully specified from 5V to ±15V).
Output voltage swings to within 55mV of the negative
supply and 250mV of the positive supply, which makes
the amplifier a good choice for low voltage single supply
operation.
Slew rates of 0.4V/μs with a supply current of 1.2mA give
superior response and settling time performance in a low
power precision amplifier.
The LT1880 is available in a 5-lead SOT-23 package.
L,
LT, LTC, LTM, Linear Technology and the Linear logo 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.
Offset Voltage: 150μV Max
Input Bias Current: 900pA Max
Offset Voltage Drift: 1.2μV/°C Max
Rail-to-Rail Output Swing
Operates with Single or Split Supplies
Open-Loop Voltage Gain: 1 Million Min
1.2mA Supply Current
Slew Rate: 0.4V/μs
Gain Bandwidth: 1.1MHz
Low Noise: 13nV/√Hz at 1kHz
Low Profile (1mm) ThinSOT
™
Package
APPLICATIONS
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Thermocouple Amplifiers
Bridge Transducer Conditioners
Instrumentation Amplifiers
Battery-Powered Systems
Photocurrent Amplifiers
TYPICAL APPLICATION
Precision Photodiode Amplifier
C1
39pF
Distribution of Input Offset Voltage
35
30
PERCENT OF UNITS (%)
R1
100k, 1%
V
S+
V
S1
25
20
15
10
5
–
LT1880
OUT
V
OUT
= 0.1V/μA
V
S
–
1880 TA01
+
320μV OUTPUT OFFSET, WORST CASE OVER 0°C TO 70°C
60kHz BANDWIDTH
5.8μs RISE TIME, 10% TO 90%, 100mV OUTPUT STEP
52μV
RMS
OUTPUT NOISE, MEASURED ON A 100kHz BW
V
S
= ±1.5V TO ±18V
S1: SIEMENS INFINEON BPW21 PHOTODIODE (~580pF)
0
–140 –100
100
60
–60 –20 20
INPUT OFFSET VOLTAGE (μV)
140
1880 TA01b
1880fa
1
LT1880
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
OUT 1
V
–
2
+IN 3
4 –IN
5 V
+
Supply Voltage (V
+
to V
–
) .........................................40V
Differential Input Voltage (Note 2) .......................... ±10V
Input Voltage......................................................V
+
to V
–
Input Current (Note 2) .......................................... ±10mA
Output Short-Circuit Duration (Note 3) ............ Indefinite
Operating Temperature Range (Note 4) ...– 40°C to 85°C
Specified Temperature Range (Note 5) ....– 40°C to 85°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 250°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT1880CS5#PBF
LT1880IS5#PBF
TAPE AND REEL
LT1880CS5#TRPBF
LT1880IS5#TRPBF
PART MARKING
LTUM
LTVW
PACKAGE DESCRIPTION
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°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/
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 5V, 0V; V
CM
= 2.5V unless otherwise noted. (Note 5)
SYMBOL PARAMETER
V
OS
Input Offset Voltage
0°C < T
A
< 70°C
–40°C < T
A
< 85°C
Input Offset Voltage Drift
(Note 6)
I
OS
Input Offset Current
0°C < T
A
< 70°C
–40°C < T
A
< 85°C
I
B
Input Bias Current
0°C < T
A
< 70°C
–40°C < T
A
< 85°C
Input Noise Voltage
e
n
i
n
R
IN
C
IN
V
CM
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
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MIN
TYP
40
MAX
150
200
250
1.2
1.2
900
1200
1400
900
1200
1500
UNITS
μV
μV
μV
μV/°C
μV/°C
pA
pA
pA
pA
pA
pA
μVp-p
nV/√Hz
pA/√Hz
MΩ
GΩ
pF
0°C < T
A
< 70°C
–40°C < T
A
< 85°C
0.3
0.3
150
150
0.1Hz to 10Hz
f = 1kHz
f = 1kHz
Differential
Common Mode, V
CM
= 1V to 3.8V
(V
–
+ 1.0)
0.5
13
0.07
380
210
3.7
(V
+
– 1.2)
V
1880fa
2
LT1880
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
CMRR
PSRR
A
VOL
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Large Signal Voltage Gain
R
L
= 10k; 1V < V
OUT
< 4V
R
L
= 2k; 1V < V
OUT
< 4V
R
L
= 1k; 1V < V
OUT
< 4V
V
OL
Output Voltage Swing Low
No Load
I
SINK
= 100μA
I
SINK
= 1mA
V
+
= 5V; No Load
V
+
= 5V; I
SOURCE
= 100μA
V
+
= 5V; I
SOURCE
= 1mA
V
+
= 3V
V
+
= 5V
V
+
= 12V
I
SC
GBW
t
S
FPBW
THD
SR
+
SR
–
Short-Circuit Current
Gain-Bandwidth Product
Settling Time
Full Power Bandwidth (Note 7)
Total Harmonic Distortion and Noise
Slew Rate Positive
Slew Rate Negative
V
OUT
Short to GND
V
OUT
Short to V
+
f = 20kHz
0.01%, V
OUT
= 1.5V to 3.5V
A
V
= –1, R
L
= 2k
V
OUT
= 4V
P-P
V
O
= 2V
P-P
, A
V
= –1, f = 1kHz, R
f
= 1k, BW = 22kHz
V
O
= 2V
P-P
, A
V
= 1, f = 1kHz, R
L
= 10k, BW = 22kHz
A
V
= –1
A
V
= –1
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l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 5V, 0V; V
CM
= 2.5V unless otherwise noted. (Note 5)
CONDITIONS
1V < V
CM
< 3.8V
V
–
= 0V, V
CM
= 1.5V; 2.7V < V
+
< 32V
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MIN
116
110
500
400
400
300
300
250
TYP
135
135
2.4
1600
800
400
20
35
130
130
150
220
1.2
1.2
1.35
MAX
UNITS
dB
dB
2.7
V
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
55
65
200
250
270
380
1.8
2.2
1.9
2.3
2
2.4
mV
mV
mV
mV
mV
mV
mA
mA
mA
mA
mA
mA
mA
mA
MHz
μs
kHz
%
%
V/μs
V/μs
V/μs
V/μs
V
OH
Output Voltage Swing High
(Referred to V
+
)
Supply Current per Amplifier
I
S
10
10
0.8
18
20
1.1
10
32
0.002
0.0008
0.25
0.2
0.25
0.25
0.4
0.55
The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
S
= ±15V, V
CM
= 0V unless otherwise noted. (Note 5)
SYMBOL PARAMETER
V
OS
Input Offset Voltage
0°C < T
A
< 70°C
–40°C < T
A
< 85°C
Input Offset Voltage Drift
(Note 6)
I
OS
Input Offset Current
0°C < T
A
< 70°C
–40°C < T
A
< 85°C
I
B
Input Bias Current
0°C < T
A
< 70°C
–40°C < T
A
< 85°C
Input Noise Voltage
0.1Hz to 10Hz
0°C < T
A
< 70°C
–40°C < T
A
< 85°C
CONDITIONS
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MIN
TYP
40
MAX
150
200
250
1.2
1.2
900
1200
1400
900
1200
1500
UNITS
μV
μV
μV
μV/°C
μV/°C
pA
pA
pA
pA
pA
pA
μV/p-p
1880fa
0.3
0.3
150
150
0.5
3
LT1880
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
e
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R
IN
C
IN
V
CM
CMRR
+PSRR
–PSRR
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
Input Capacitance
Input Voltage Range
Common Mode Rejection Ratio
Positive Power Supply Rejection
Ratio
Negative Power Supply Rejection
Ratio
Minimum Operating Supply Voltage
A
VOL
Large Signal Voltage Gain
R
L
= 10k; –13.5V < V
OUT
< 13.5V
R
L
= 2k; –13.5V < V
OUT
< 13.5V
V
OL
Output Voltage Swing Low
(Referred to V
EE
)
Output Voltage Swing High
(Referred to V
CC
)
Supply Current per Amplifier
Short-Circuit Current
V
OUT
Short to V
–
V
OUT
Short to V
+
FPBW
GBW
THD
SR
+
SR
–
Full Power Bandwidth (Note 7)
Gain Bandwidth Product
Total Harmonic Distortion and Noise
Slew Rate Positive
Slew Rate Negative
V
OUT
= 14V
P-P
f = 20kHz
V
O
= 25V
P-P
, A
V
= –1, f = 100kHz, R
f
= 10k, BW = 22kHz
V
O
= 25V
P-P
, A
V
= 1, f = 100kHz, R
L
= 10k, BW = 22kHz
A
V
= –1
A
V
= –1
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The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= ± 15V; V
CM
= 0V unless otherwise noted. (Note 5)
CONDITIONS
f = 1kHz
f = 1kHz
Differential
Common Mode, V
CM
= –13.5V to 13.5V
–13.5
118
110
110
135
135
135
±1.2
1000
700
500
300
1600
1000
25
35
130
185
195
270
1.5
1.8
10
10
10
10
0.8
25
25
20
20
9
1.1
0.00029
0.00029
0.25
0.2
0.25
0.2
0.4
0.55
65
75
200
350
370
450
2.3
2.8
±1.35
MIN
TYP
13
0.07
380
190
3.7
13.5
–13.5V < V
CM
< 13.5V
V
–
= –15V, V
CM
= 0V; 1.5V < V
+
< 18V
V
+
= 15V, V
CM
= 0V; –1.5V < V
–
< –18V
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MAX
UNITS
nV/√Hz
pA/√Hz
MΩ
GΩ
pF
V
dB
dB
dB
V
V/mV
V/mV
V/mV
V/mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
mA
mA
mA
kHz
MHz
%
%
V/μs
V/μs
V/μs
V/μs
No Load
I
SINK
= 100μA
I
SINK
= 1mA
No Load
I
SINK
= 100μA
I
SINK
= 1mA
V
OH
I
S
I
SC
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:
The inputs are protected by back-to-back diodes. If the differential
input voltage exceeds 10V, see Application Information, the input current
should be limited to less than 10mA.
Note 3:
A heat sink may be required to keep the junction temperature
below absolute maximum ratings.
Note 4:
The LT1880C and LT1880I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 5:
The LT1880C is guaranteed to meet specified performance from
0°C to 70°C and 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 LT1880I is guaranteed to meet specified performance
from –40°C to 85°C.
Note 6:
This parameter is not 100% tested.
Note 7:
Full power bandwidth is calculated from the slew rate.
FPBW = SR/(2πV
P
)
1880fa
4
LT1880
TYPICAL PERFORMANCE CHARACTERISTICS
Input Offset Voltage
vs Temperature
200
150
INPUT OFFSET VOLTAGE (μV)
100
50
0
–50
–100
–150
–200
–55 –35 –15
45 65 85 105 125
TEMPERATURE (°C)
1880 G01
Input Bias Current
vs Common Mode Voltage
1000
800
INPUT BIAS CURRENT (pA)
600
400
200
0
–200
–400
–600
–800
I
B+
T
A
= 25°C
T
A
= –40°C
T
A
= 85°C
Input Bias Current
vs Common Mode Near V
CC
1000
I
B–
INPUT BIAS CURRENT (pA)
500
V
S
= ±15V
TEMPCO: –55°C TO 125°C
10 REPRESENTATIVE UNITS
I
B
–
0
I
B+
–500
T
A
= –45°C
T
A
= 25°C
T
A
= 85°C
5
25
V
S
= ±15V
–1000
–10
0
5
10
–15
–5
COMMON MODE VOLTAGE (V)
15
1880 G02
–1000
13.0
13.8
14.2
13.4
COMMON MODE VOLTAGE (V)
14.6
1880 G02A
Input Bias Current
vs Common Mode Near V
EE
1000
200
V
S
= ±15V
INPUT BIAS CURRENT (pA)
150
100
50
0
–50
–100
–150
–200
–250
Input Bias Current vs Temperature
V
S
= ±15V
Output Voltage Swing
vs Load Current
OUTPUT VOLTAGE
SWING (V
+
)
T
A
= –40°C
–0.5
–1.0
–1.5
1.5
1.0
0.5
T
A
= –40°C
–10 –8 –6 –4 –2 0 2
4 6
OUTPUT CURRENT (mA)
8
10
T
A
= 25°C
T
A
= 85°C
T
A
= 85°C
T
A
= 25°C
INPUT BIAS CURRENT (pA)
I
B–
500
0
I
B–
I
B
+
–500
I
B+
–1000
–14.6
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
–13.0
1880 G02B
–13.8
–14.2
–13.4
COMMON MODE VOLTAGE (V)
–300
–50
–25
25
50
0
TEMPERATURE (°C)
75
100
1880 G03
OUTPUT VOLTAGE
SWING (V
–
)
1880 G04
Warm Up Drift
6
OFFSET VOLTAGE CHANGE (μV)
5
4
3
2
1
0
V
S
= ±2.5V
V
S
= ±15V
T
A
= 25°C
1000
CURRENT NOISE DENSITY (fA/√Hz)
VOLTAGE NOISE DENSITY (nV/√Hz)
e
n
, i
n
vs Frequency
V
S
= ±15V
T
A
= 25°C
CURRENT NOISE
100
NOISE VOLTAGE (0.2μV/DIV)
0.1 to 10Hz Noise
VOLTAGE NOISE
10
1
0
1
2
3
4
TIME AFTER POWER ON (MIN)
5
1880 G05
V
S
= ±15V
T
A
= 25°C
1
10
100
FREQUENCY (Hz)
1k
1880 G08
0
2
6
4
TIME (SEC)
8
10
1880 G09a
1880fa
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