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1
LTC2050
Zero-Drift
Operational Amplifier
in SOT-23
November 1999
s
Thermocouple Amplifiers
s
Electronic Scales
s
Medical Instrumentation
s
Strain Gauge Amplifiers
s
High Resolution Data Acquisition
s
DC Accurate RC Active Filters
U
S
A
O
PPLICATI
s
SOT-23 Package
s
Maximum Offset Voltage of 3
V
s
Maximum Offset Voltage Drift of 30nV/
C
s
Noise: 1.5
V
P-P
(0.1Hz to 10Hz Typ)
s
Voltage Gain: 140dB (Typ)
s
PSRR: 130dB (Typ)
s
CMRR: 130dB (Typ)
s
Supply Current: 0.8mA (Typ)
s
Single Supply Operation: 2.7V to 6V
s
Extended Common Mode Input Range
s
Output Swings Rail-to-Rail
s
Overload Recovery Time: 2ms (Typ)
S
FEATURE
D
U
ESCRIPTIO
The LTC
2050 is a low drift operational amplifier available
in the 5- or 6-lead SOT-23 and SO-8 packages. It operates
from a single 2.7V supply while still supporting 5V appli-
cations. The power consumption is 800
A and the ver-
sions in the 6-lead SOT-23 and SO-8 packages offer power
shutdown (active low).
The LTC2050, despite its miniature size, features uncom-
promising DC performance. The typical input offset volt-
age and offset drift are 0.5
V and 10nV/
C. The almost
zero DC offset and drift are supported with a power supply
rejection ratio (PSRR) and common mode rejection ratio
(CMRR) of more than 130dB.
The input common mode voltage ranges from the negative
supply up to 1V from the positive supply. The LTC2050
also has an enhanced output stage capable of driving
loads as low as 1k
to both supply rails. The open-loop
gain, loaded with 1k
, is in excess of 140dB. The LTC2050
also features a 1.5
V
P-P
DC to 10Hz noise and a 3MHz gain
bandwidth product.
Input Referred Noise 0.1Hz to 10Hz
Differential Bridge Amplifier
U
A
O
PPLICATI
TYPICAL
, LTC and LT are registered trademarks of Linear Technology Corporation.
+
5V
1000pF
18.2k
1000pF
18.2k
7
6
4
3
2
0.1
F
5V
A
V
= 100
2050 TA01
350
STRAIN
GAUGE
50
GAIN
TRIM
LTC2050
TIME (s)
0
V
3
1
8
LT2050 TA02
0
1
3
2
4
6
10
V
S
= 5V
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-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Final Electrical Specifications
2
LTC2050
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
C. V
S
= 3V unless otherwise noted. (Note 3)
W
U
U
PACKAGE/ORDER I FOR ATIO
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
ORDER PART
NUMBER
Total Supply Voltage (V
+
to V
) ............................... 7V
Input Voltage ........................ (V
+
+ 0.3V) to (V
0.3V)
Output Short-Circuit Duration ......................... Indefinite
Operating Temperature Range ............... 40
C to 85
C
LTC2050CS5
T
JMAX
= 125
C,
JA
= 190
CW
S5 PART
MARKING
LTIN
Specified Temperature Range (Note 3) .. 40
C to 85
C
Storage Temperature Range ................ 65
C to 150
C
Lead Temperature (Soldering, 10 sec)................. 300
C
1
2
3
4
8
7
6
5
TOP VIEW
NC
V
+
OUT
NC
SHDN
IN
+IN
V
S8 PACKAGE
8-LEAD PLASTIC SO
ORDER PART
NUMBER
LTC2050CS6
S6 PART
MARKING
LTIP
ORDER PART
NUMBER
LTC2050CS8
LTC2050IS8
S8 PART
MARKING
2050
2050I
OUT 1
V
2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
+IN 3
5 V
+
4 IN
T
JMAX
= 125
C,
JA
= 230
CW
T
JMAX
= 125
C,
JA
= 250
CW
OUT 1
V
2
+IN 3
6 V
+
5 SHDN
4 IN
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC SOT-23
ELECTRICAL C
C
HARA TERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Offset Voltage
(Note 2)
0.5
3
V
Average Input Offset Drift
(Note 2)
q
0.03
V/
C
Long-Term Offset Drift
50
nV/
mo
Input Bias Current
20
75
pA
q
300
pA
Input Offset Current
150
pA
q
200
pA
Input Noise Voltage
R
S
= 100
, DC to 10Hz
1.5
V
P-P
Common Mode Rejection Ratio
V
CM
= V
to V
+
1.3
115
130
dB
q
110
130
dB
Power Supply Rejection Ratio
120
130
dB
q
115
130
dB
Large-Signal Voltage Gain
R
L
= 10k
120
140
dB
q
115
140
dB
Maximum Output Voltage Swing
R
L
= 2k
q
2.85
2.94
V
R
L
= 10k
q
2.95
2.98
V
Slew Rate
2
V/
s
Gain Bandwidth Product
3
MHz
Supply Current
V
SHDN
= V
+
, No Load
q
0.75
1.1
mA
V
SHDN
= V
q
10
A
Consult factory for Military grade parts.
(Note 1)
3
LTC2050
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: These parameters are guaranteed by design. Thermocouple effects
preclude measurements of these voltage levels during automated testing.
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25
C.
V
S
= 5V unless otherwise noted. (Note 3)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Offset Voltage
(Note 2)
0.5
3
V
Average Input Offset Drift
(Note 2)
q
0.03
V/
C
Long-Term Offset Drift
50
nV/
mo
Input Bias Current
150
pA
q
300
pA
Input Offset Current
300
pA
q
400
pA
Input Noise Voltage
R
S
= 100
, DC to 10Hz
1.5
V
P-P
Common Mode Rejection Ratio
V
CM
= V
to V
+
1.3
120
130
dB
q
115
130
dB
Power Supply Rejection Ratio
120
130
dB
q
115
130
dB
Large-Signal Voltage Gain
R
L
= 10k
125
140
dB
q
120
140
dB
Maximum Output Voltage Swing
R
L
= 2k
q
4.85
4.94
V
R
L
= 10k
q
4.95
4.98
V
Slew Rate
2
V/
s
Gain Bandwidth Product
3
MHz
Supply Current
V
SHDN
= V
+
, No Load
q
0.8
1.2
mA
V
SHDN
= V
q
10
A
Shutdown Pin Input Low Voltage
q
V
+ 0.5
V
Shutdown Pin Input High Voltage
q
V
+
0.5
V
Shutdown Pin Input Current
V
SHDN
= V
q
0.5
5
A
Internal Sampling Frequency
7.5
kHz
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
C. V
S
= 3V unless otherwise noted. (Note 3)
ELECTRICAL C
C
HARA TERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Shutdown Pin Input Low Voltage
q
V
+ 0.5
V
Shutdown Pin Input High Voltage
q
V
+
0.5
V
Shutdown Pin Input Current
V
SHDN
= V
q
0.5
3
A
Internal Sampling Frequency
7.5
kHz
Note 3: The LTC2050C is guaranteed to meet specified performance from
0
C to 70
C and is designed, characterized and expected to meet these
extended temperature limits, but is not tested at 40
C and 85
C. The
LTC2050I is guaranteed to meet the extended temperature limits.
4
LTC2050
LINEAR TECHNOLOGY CORPORATION 1999
2050i LT/TP 1199 4K PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
q
FAX: (408) 434-0507
q
www.linear-tech.com
PACKAGE DESCRIPTIO
N
U
Dimensions in inches (millimeters) unless otherwise noted.
S6 Package
6-Lead Plastic SOT-23
(LTC DWG # 05-08-1634)
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
1.50 1.75
(0.059 0.069)
0.35 0.55
(0.014 0.022)
0.35 0.50
(0.014 0.020)
SIX PLACES (NOTE 2)
S6 SOT-23 0898
0.90 1.45
(0.035 0.057)
0.90 1.30
(0.035 0.051)
0.00 0.15
(0.00 0.006)
0.09 0.20
(0.004 0.008)
(NOTE 2)
2.6 3.0
(0.110 0.118)
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)
0.95
(0.037)
REF
2.80 3.00
(0.110 0.118)
(NOTE 3)
1.90
(0.074)
REF
0.016 0.050
(0.406 1.270)
0.010 0.020
(0.254 0.508)
45
0
8
TYP
0.008 0.010
(0.203 0.254)
SO8 1298
0.053 0.069
(1.346 1.752)
0.014 0.019
(0.355 0.483)
TYP
0.004 0.010
(0.101 0.254)
0.050
(1.270)
BSC
1
2
3
4
0.150 0.157**
(3.810 3.988)
8
7
6
5
0.189 0.197*
(4.801 5.004)
0.228 0.244
(5.791 6.197)
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**
S5 Package
5-Lead Plastic SOT-23
(LTC DWG # 05-08-1633)
1.50 1.75
(0.059 0.069)
0.35 0.55
(0.014 0.022)
0.35 0.50
(0.014 0.020)
FIVE PLACES (NOTE 2)
S5 SOT-23 0599
0.90 1.45
(0.035 0.057)
0.90 1.30
(0.035 0.051)
0.00 0.15
(0.00 0.006)
0.09 0.20
(0.004 0.008)
(NOTE 2)
2.60 3.00
(0.102 0.118)
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)
0.95
(0.037)
REF
2.80 3.00
(0.110 0.118)
(NOTE 3)
1.90
(0.074)
REF
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PART NUMBER
DESCRIPTION
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Low Supply Current 200
A
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Single Supply Operation 4.75V to 16V, Noise Tested and Guaranteed
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Precision Zero-Drift Op Amp
Dual/Quad
LTC1150
15V Zero-Drift Op Amp
High Voltage Operation
18V
LTC1152
Rail-to-Rail Input and Output Zero-Drift Op Amp
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