LT1101
Precision, Micropower,
Single Supply Instrumentation
Amplifier (Fixed Gain = 10 or 100)
DESCRIPTIO
The LT
®
1101 establishes the following milestones:
(1) It is the first micropower instrumentation amplifier,
(2) It is the first single supply instrumentation amplifier,
(3) It is the first instrumentation amplifier to feature fixed
gains of 10 and/or 100 in low cost, space-saving 8-lead
packages.
The LT1101 is completely self-contained: no external gain
setting resistor is required. The LT1101 combines its
micropower operation (75µA supply current) with a
gain error of 0.008%, gain linearity of 3ppm, gain drift of
1ppm/°C. The output is guaranteed to drive a 2k load to
±10V
with excellent gain accuracy.
Other precision specifications are also outstanding:
50µV input offset voltage, 130pA input offset current, and
low drift (0.4µV/°C and 0.7pA/°C). In addition, unlike other
instrumentation amplifiers, there is no output offset
voltage contribution to total error.
A full set of specifications are provided with
±15V
dual
supplies and for single 5V supply operation. The LT1101
can be operated from a single lithium cell or two Ni-Cad
batteries. Battery voltage can drop as low as 1.8V, yet the
LT1101 still maintains its gain accuracy. In single supply
applications, both input and output voltages swing
to within a few millivolts of ground. The output sinks
current while swinging to ground—no external, power
consuming pull down resistors are needed.
FEATURES
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Gain Error: 0.04% Max
Gain Nonlinearity: 0.0008% (8ppm) Max
Gain Drift: 4ppm/°C Max
Supply Current: 105µA Max
Offset Voltage: 160µV Max
Offset Voltage Drift: 0.4µV/°C Typ
Offset Current: 600pA Max
CMRR, G = 100: 100dB Min
0.1Hz to 10Hz Noise: 0.9µVp-p Typ
2.3pAp-p Typ
Gain Bandwidth Product: 250kHz Min
Single or Dual Supply Operation
Surface Mount Package Available
APPLICATIO S
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Differential Signal Amplification in Presence of
Common Mode Voltage
Micropower Bridge Transducer Amplifier
– Thermocouples
– Strain Gauges
– Thermistors
Differential Voltage-to-Current Converter
Transformer Coupled Amplifier
4mA to 20mA Bridge Transmitter
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
GROUND 1
(REF)
90R
SHORT TO 1, 2
G = 10
N.C. G = 100
Gain Error Distribution
8
90R
PERCENT OF UNITS
30
OUTPUT
25
9R
R
R
9R
7 SHORT TO 8
G = 10
N.C. G = 100
20
15
10
5
–
A
INVERTING 3
INPUT
4
V
–
B
GROUND PIN 1, OUTPUT AT PIN 8
G = 100: NO ADDITIONAL CONNECTIONS
G = 10: SHORT PIN 2 TO PIN 1, SHORT PIN 7 TO PIN 8
+
+
R
≈
9.2k
6 NONINVERTING
INPUT
5
+
V
0
–0.04 –0.03 –0.02 –0.01 0 0.01 0.02 0.03 0.04
GAIN ERROR (%)
LT1101 • TA02
LT1101 • TA01
U
–
U
U
G = 100
R
L
= 50k
T
A
= 25°C
930 UNITS
TESTED
IN ALL PACKAGES
1101fa
1
LT1101
ABSOLUTE
AXI U
RATI GS
(Note 1)
Operating Temperature Range
LT1101AM/LT1101M
(OBSOLETE)
... – 55°C to 125°C
LT1101AI/LT1101I .............................. –40°C to 85°C
LT1101AC/LT1101C ................................ 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Supply Voltage ......................................................
±22V
Differential Input Voltage .......................................
±36V
Input Voltage ............... Equal to Positive Supply Voltage
..........10V Below Negative Supply Voltage
Output Short Circuit Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
GROUND
(REF) 1
REF
2
G = 10
TOP VIEW
OUTPUT
8
OUT
7 G = 10
90R
R
+
–
GROUND
(REF)
1
90R
90R
90R R
9R
9R
6 +IN
REF
G = 10
2
9R
R
R
9R
–IN 3
5 V
+
V–
4
R
≈
9.2k
4
V
–
(CASE)
H PACKAGE
8-LEAD TO-5 METAL CAN
T
JMAX
= 150°C,
θ
JA
= 150°C/W,
θ
JC
= 45°C/W
5
V+
NC
6
V–
7
NC
8
R
≈
9.2k
N PACKAGE 8-LEAD PDIP
T
JMAX
= 150°C,
θ
JA
= 130°C/W
J PACKAGE 8-LEAD CERDIP
T
JMAX
= 150°C,
θ
JA
= 100°C/W
SW PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 100°C/W
ORDER PART
NUMBER
LT1101AMH
LT1101MH
LT1101ACH
LT1101CH
Consider the N8 as an Alternate Source
ORDER PART
NUMBER
LT1101AMJ8
LT1101MJ8
LT1101ACJ8
LT1101CJ8
LT1101AIN8
LT1101IN8
LT1101ACN8
LT1101CN8
ORDER PART
NUMBER
LT1101SW
LT1101ISW
OBSOLETE PACKAGES
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
otherwise noted. (Note 4)
SYMBOL PARAMETER
G
E
G
NL
V
OS
l
OS
I
B
I
S
Gain Error
Gain Nonlinearity
Input Offset Voltage
LT1101SW
Input Offset Current
Input Bias Current
Supply Current
CONDITIONS
V
S
= 5V, 0V, V
CM
= 0.1V, V
REF(PIN 1)
= 0.1V, G = 10 or 100, T
A
= 25°C, unless
LT11O1AM/AI/AC
MIN
TYP
MAX
0.010
0009
20
3
50
0.13
6
75
0.050
0.040
60
7
160
0.60
8
105
LT1101M/I/C
MIN
TYP
MAX
0.011
0.010
20
3
60
250
0.15
6
78
0.075
0.060
75
8
220
600
0.90
10
120
G = 100, V
0
= 0.1V to 3.5V, R
L
= 50k
G = 10, V
0
= 0.1V to 3.5V, R
L
= 50k
G = 100, R
L
= 50k
G = 10, R
L
= 50k (Note 2)
2
+
–
+
–
+
–
+
–
–IN
3
U
U
W
W W
U
W
TOP VIEW
8
TOP VIEW
OUTPUT
OUT
G = 10
+IN
NC
1
GND (REF)
2
7
16
NC
15
OUTPUT
90R
9R
R
R
90R
9R
6
NC
3
REF
4
G = 10
–IN
5
14
NC
13
OUT
12
+IN
11
NC
10
V +
9
G = 10
+
–
NC
UNITS
%
%
ppm
ppm
µV
µV
nA
nA
µA
1101fa
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