LT1102
High Speed, Precision,
JFET Input Instrumentation Amplifier
(Fixed Gain = 10 or 100)
FEATURES
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DESCRIPTIO
Slew Rate: 30V/μs
Gain-Bandwidth Product: 35MHz
Settling Time (0.01%): 3μs
Overdrive Recovery: 0.4μs
Gain Error: 0.05% Max
Gain Drift: 5ppm/°C
Gain Nonlinearity: 16ppm Max
Offset Voltage (Input + Output): 600μV Max
– Drift with Temperature: 2μV/°C
Input Bias Current: 40pA Max
Input Offset Current: 40pA Max
– Drift with Temperature (to 70°C): 0.5pA/°C
The LT
®
1102 is the first fast FET input instrumentation
amplifier offered in the low cost, space saving 8-pin
packages. Fixed gains of 10 and 100 are provided with
excellent gain accuracy (0.01%) and non-linearity (3ppm).
No external gain setting resistor is required.
Slew rate, settling time, gain-bandwidth product,
overdrive recovery time are all improved compared to
competitive high speed instrumentation amplifiers.
Industry best speed performance is combined with
impressive precision specifications: less than 10pA input
bias and offset currents, 180μV offset voltage. Unlike
other FET input instrumentation amplifiers, on the LT1102
there is no output offset voltage contribution to total error,
and input bias currents do not double with every 10°C rise
in temperature. Indeed, at 70°C ambient temperature the
input bias current is only 40pA.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Fast Settling Analog Signal Processing
Multiplexed Input Data Acquisition Systems
High Source Impedance Signal Amplification from
High Resistance Bridges, Capacitance Sensors,
Photodetector Sensors
Bridge Amplifier with < 1Hz Lowpass Filtering
TYPICAL APPLICATIO
Wideband Instrumentation Amplifier
with
±150mA
Output Current
V
+
= 15V
6
5
R
7
LT1102
3
4
8
LT1010
OUT
–
1
2
V
–
= – 15V
OUTPUT =
±
10V INTO 75Ω TO 330kHz (R = 50Ω)
±
10V INTO 200Ω TO 330kHz (R = 200Ω)
DRIVES 2.2nF CAP LOAD
GAIN = 10, DEGRADED 0.01% DUE TO LT1010
LT1102 • TA01
5V/DIV
+
BIAS
G = 10
U
Slew Rate
FPO
0.5μs/DIV
FPOLT1102
• TA02
U
U
1102fb
1
LT1102
ABSOLUTE
AXI U
RATI GS
Supply Voltage ......................................................
±20V
Differential Input Voltage .......................................
±40V
Input Voltage .........................................................
±20V
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
PACKAGE/ORDER I FOR ATIO
TOP VIEW
OUTPUT
8
ORDER PART
NUMBER
GROUND
(REF) 1
REF
2
G = 10
OUT
7 G = 10
90R
R
+
–
6 +IN
9R
–IN 3
+
–
9 = 1.8k
5 V
+
V
–
4
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 100°C,
θ
JA
= 130°C/W
4
V
–
(CASE)
H PACKAGE
8-LEAD TO-5 METAL CAN
J8 PACKAGE
8-LEAD CERDIP
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
+
–
+
–
90R R
9R
LT1102AMH
LT1102MH
LT1102ACH
LT1102CH
U
U
W
W W
U
W
(Note 1)
Output Short-Circuit Duration .......................... Indefinite
Operating Temperature Range
LT1102I .............................................. –40°C to 85°C
LT1102AC/LT1102C ................................ 0°C to 70°C
LT1102AM/LT1102M
(OBSOLETE).....–55°C
to 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
GROUND
(REF) 1
90R
REF
2
G = 10
9R
LT1102
8 OUTPUT
90R
7
R
R
9R
OUT
G = 10
ORDER PART
NUMBER
LT1102IN8
LT1102ACN8
LT1102CN8
–IN 3
6 +IN
5 V
+
LT1102MJ8
LT1102CJ8
LT1102 • POI01
1102fb
LT1102
ELECTRICAL CHARACTERISTICS
SYMBOL
G
E
G
NL
PARAMETER
Gain Error
Gain Nonlinearity
CONDITIONS
V
S
=
±15V,
V
CM
= 0V, T
A
= 25°C, Gain = 10 or 100, unless otherwise noted.
LT1102AM/AC
MIN
TYP
MAX
0.010
3
8
7
180
3
±3
0.050
14
20
16
600
40
±40
LT1102M/I/C
MIN
TYP
MAX
0.012
4
8
7
200
4
±4
10
12
10
11
10
12
2.8
30
4
±10.5
82
86
5.0
±13.0
±12.0
100
1.7
10
18
37
20
2
±11.5
97
101
3.4
±13.5
±13.0
220
3.5
17
30
400
4.0
6.5
13
18
1.8
3.0
7
9
4.0
6.5
13
18
5.6
5
0.070
18
25
30
900
60
±60
UNITS
%
ppm
ppm
ppm
μV
pA
pA
Ω
Ω
Ω
V
O
=
±10V,
R
L
= 50k or 2k
G = 100, R
L
= 50k
G = 100, R
L
= 2k
G = 10, RL = 50k or 2k
V
OS
I
OS
I
B
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Resistance
Common Mode
Differential Mode
V
CM
= – 11V to 8V
V
CM
= 8V to 11V
0.1Hz to 10Hz
f
O
= 10Hz
f
O
= 1000Hz (Note 2)
f
O
= 1000Hz, 10Hz (Note 3)
±10.5
1k Source Imbalance, V
CM
=
±10.5V
V
S
=
±
9V to
±18V
84
88
10
12
10
11
10
12
2.8
37
19
1.5
±11.5
98
102
3.3
e
n
Input Noise Voltage
Input Noise Voltage
Density
Input Noise Current
Density
lnput Voltage Range
μV
P-P
nV/√Hz
nV/√Hz
fA/√Hz
V
dB
dB
mA
V
V
kHz
MHz
V/μs
V/μs
ns
μs
μs
μs
μs
CMRR
PSRR
I
S
V
O
BW
SR
Common Mode
Rejection Ratio
Power Supply
Rejection Ratio
Supply Current
Maximum Output
Voltage Swing
Bandwidth
Slew Rate
Overdrive Recovery
Settling Time
R
L
= 50k
R
L
= 2k
G = 100 (Note 4)
G = 10 (Note 4)
G = 100, V
IN
=
±0.13V,
V
O
=
±5V
G = 10, V
IN
=
±1V,
V
O
=
±5V
50% Overdrive (Note 5)
V
O
= 20V Step (Note 4)
G = 10 to 0.05%
G = 10 to 0.01%
G = 100 to 0.05%
G = 100 to 0.01%
±13.0
±12.0
120
2.0
12
21
±13.5
±13.0
220
3.5
17
30
400
1.8
3.0
7
9
1102fb
3
LT1102
ELECTRICAL CHARACTERISTICS
SYMBOL
G
E
TCG
E
G
NL
PARAMETER
Gain Error
Gain Error Drift
(Note 6)
Gain Nonlinearity
CONDITIONS
G = 100, V
O
=
±10V,
R
L
= 50k or 2k
G = 10, V
O
=
±10V,
R
L
= 50k or 2k
G = 100, R
L
= 50k or 2k
G = 10, R
L
= 50k or 2k
G = 100, R
L
= 50k
G = 100, R
L
= 2k
G = 10, R
L
= 50k or 2k
(Note 6)
–40°C
≤
T
A
≤
85°C for I grades, unless otherwise noted.
V
S
=
±15V,
V
CM
= 0V, Gain = 10 or 100, –55°C
≤
T
A
≤
125°C for AM/M grades,
LT1102AM
MIN
TYP
MAX
0.10
0.05
9
5
20
28
9
300
2
0.3
±2
0.25
0.12
20
10
70
85
20
1400
8
4
±10
80
84
LT1102M/I
MIN
TYP MAX
0.10
0.06
10
6
24
32
9
400
3
0.4
±2.5
96
99
2.5
±12.5
±12.0
±13.2
±12.6
0.30
0.15
25
14
90
110
24
2000
12
6
±15
UNITS
%
%
ppm/°C
ppm/°C
ppm
ppm
ppm
μV
μV/°C
nA
nA
dB
dB
mA
V
V
V
OS
ΔV
OS
/ΔT
l
OS
I
B
CMRR
PSRR
I
S
V
O
Input Offset Voltage
Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Common Mode
Rejection Ratio
Power Supply
Rejection Ratio
Supply Current
Maximal Output
Voltage Swing
V
CM
=
±10.3V
V
S
=
±10V
to
±17V
T
A
= 125°C
R
L
= 50k
R
L
= 2k
±12.5
±12.0
82
88
97
100
2.5
±13.2
±12.6
V
S
=
±15V,
V
CM
= 0V, Gain = 10 or 100, 0°C
≤
T
A
≤
70°C, unless otherwise noted.
SYMBOL
G
E
TCG
E
G
NL
PARAMETER
Gain Error
Gain Error Drift
(Note 6)
Gain Nonlinearity
CONDITIONS
G = 100, V
O
=
±10V,
R
L
= 50k or 2k
G = 10, V
O
=
±10V,
R
L
= 50k or 2k
G = 100, R
L
= 50k or 2k
G = 10, R
L
= 50k or 2k
G = 100, R
L
= 50k
G = 100, R
L
= 2k
G = 10, R
L
= 50k or 2k
(Note 6)
(Note 6)
(Note 6)
V
CM
=
±10.3V
V
S
=
±10V
to
±17V
T
A
= 70°C
R
L
= 50k
R
L
= 2k
±12.8
±12.0
83
87
LT1102AC
MIN
TYP
MAX
0.04
0.03
8
5
8
11
8
230
2
10
0.5
±40
1
98
101
2.8
±13.4
±12.8
±12.8
±12.0
0.11
0.09
18
10
30
36
18
1000
8
150
3
±300
4
81
85
LT1102C
MIN
TYP MAX
0.05
0.04
9
6
9
12
8
280
3
15
0.5
±50
1
97
100
2.9
±13.4
±12.8
0.14
0.12
22
14
40
48
22
1400
12
220
4
±400
6
UNITS
%
%
ppm/°C
ppm/°C
ppm
ppm
ppm
μV
μV/°C
pA
pA/°C
pA
pA/°C
dB
dB
mA
V
V
V
OS
ΔV
OS
/ΔT
I
OS
ΔI
OS
/ΔT
I
B
ΔI
B
/ΔT
CMRR
PSRR
I
S
V
O
Input Offset Voltage
Input Offset Voltage Drift
Input Offset Current
Input Offset Current Drift
Input Bias Current
lnput Bias Current Drift
Common Mode
Rejection Ratio
Power Supply
Rejection Ratio
Supply Current
Maximum Output
Voltage Swing
1102fb
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LT1102
ELECTRICAL CHARACTERISTICS
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:
This parameter is tested on a sample basis only.
Note 3:
Current noise is calculated from the formula:
i
n
= (2qI
B
)
1/2
where q = 1.6 • 10
–19
coulomb. The noise of source resistors up to 1GΩ
swamps the contribution of current noise.
Note 4:
This parameter is not tested. It is guaranteed by design and by
inference from the slew rate measurement.
Note 5:
Overdrive recovery is defined as the time delay from the removal
of an input overdrive to the output’s return from saturation to linear
operation.
50% overdrive equals V
IN
=
±2V
(G = 10) or V
IN
=
±200mV
(G = 100).
Note 6:
This parameter is not tested. It is guaranteed by design and by
inference from other tests.
TYPICAL PERFOR A CE CHARACTERISTICS
Small Signal Response, G = 10
(Input = 50mV Pulse)
Small Signal Response, G = 100
(Input = 5mV Pulse)
Slew Rate, G = 100
(Input =
±130mV
Pulse)
100mV/DIV
100mV/DIV
2μS/DIV
FPOLT1102
• TPC01
2μS/DIV
FPOLT1102
• TPC02
5V/DIV
Settling Time, G = 10
(Input From – 10V to 10V)
5mV/DIV AT SUM NODE
1μS/DIV
FPOLT1102
• TPC04
5mV/DIV AT SUM NODE
Settling Time, G = 100
(Input From – 10V to 10V)
5mV/DIV AT SUM NODE
5mV/DIV AT SUM NODE
U W
FPOLT1102
• TPC06
2μS/DIV
FPOLT1102
• TPC03
Settling Time, G = 10
(Input From 10V to –10V)
1μS/DIV
FPOLT1102
• TPC05
Settling Time, G = 100
(Input From 10V to –10V)
2μS/DIV
FPOLT1102
• TPC07
2μS/DIV
1102fb
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