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® INA111
INA111
INA111
High Speed FET-Input
INSTRUMENTATION AMPLIFIER
FEATURES
q FET INPUT: I = 20pA max
B
q HIGH SPEED: TS = 4µs (G = 100, 0.01%)
q LOW OFFSET VOLTAGE: 500µV max
q LOW OFFSET VOLTAGE DRIFT:
5µV/°C max
q HIGH COMMON-MODE REJECTION:
106dB min
q 8-PIN PLASTIC DIP, SOL-16 SOIC
APPLICATIONS
q MEDICAL INSTRUMENTATION
q DATA ACQUISITION
DESCRIPTION
The INA111 is a high speed, FET-input instrumenta-
tion amplifier offering excellent performance.
The INA111 uses a current-feedback topology provid-
ing extended bandwidth (2MHz at G = 10) and fast
settling time (4µs to 0.01% at G = 100). A single
external resistor sets any gain from 1 to over 1000.
Offset voltage and drift are laser trimmed for excellent
DC accuracy. The INA111’s FET inputs reduce input
bias current to under 20pA, simplifying input filtering
and limiting circuitry.
The INA111 is available in 8-pin plastic DIP, and
SOL-16 surface-mount packages, specified for the
–40°C to +85°C temperature range.
–2
VIN (4)
1
(2)
RG
8
(15)
+3
VIN (5)
V+
7 (13)
A1
25k
10k
25k
A2
10k
INA111
10k
Feedback
(12)
DIP Connected
Internally
A3
10k
6
(11) VO
5
Ref
(10)
G = 1 + 50k
RG
4 (7)
DIP (SOIC)
V–
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1992 Burr-Brown Corporation
PDS-11143E
INA111Printed in U.S.A. March, 1998
®

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SPECIFICATIONS
ELECTRICAL
At TA = +25°C, VS = ±15V, RL = 2k, unless otherwise noted.
PARAMETER
CONDITIONS
INPUT
Offset Voltage, RTI
Initial
vs Temperature
vs Power Supply
Impedance, Differential
TA = +25°C
TA = TMIN to TMAX
VS = ±6V to ±18V
Common-Mode
Input Common-Mode Range
VDIFF = 0V
Common-Mode Rejection VCM = ±10V, RS = 1k
G=1
G = 10
G = 100
G = 1000
BIAS CURRENT
OFFSET CURRENT
NOISE VOLTAGE, RTI
f = 100Hz
f = 1kHz
f = 10kHz
fB = 0.1Hz to 10Hz
Noise Current
f = 10kHz
G = 1000, RS = 0
GAIN
Gain Equation
Range of Gain
Gain Error
Gain vs Temperature
50kResistance(1)
G = 1, RL = 10k
G = 10, RL = 10k
G = 100, RL = 10k
G = 1000, RL = 10k
G=1
Nonlinearity
G=1
G = 10
G = 100
G = 1000
OUTPUT
Voltage
Load Capacitance Stability
Short Circuit Current
IO = 5mA, TMIN to TMAX
FREQUENCY RESPONSE
Bandwidth, –3dB
Slew Rate
Settling Time, 0.01%
Overload Recovery
G=1
G = 10
G = 100
G = 1000
VO = ±10V, G = 2 to 100
G=1
G = 10
G = 100
G = 1000
50% Overdrive
POWER SUPPLY
Voltage Range
Current
TEMPERATURE RANGE
Specification
Operating
θJA
VIN = 0V
MIN
±10
80
96
106
106
1
±11
±6
–40
–40
INA111BP, BU
TYP
MAX
±100 ± 500/G
±2 ± 10/G
2 +10/G
1012 || 6
1012 || 3
±12
±500 ± 2000/G
±5 ± 100/G
30 + 100/G
90
110
115
115
±2 ±20
±0.1 ±10
13
10
10
1
0.8
1 + (50k/RG)
±0.01
±0.1
±0.15
±0.25
±1
±25
±0.0005
±0.001
±0.001
±0.005
10000
±0.02
±0.5
±0.5
±1
±10
±100
±0.005
±0.005
±0.005
±0.02
±12.7
1000
+30/–25
2
2
450
50
17
2
2
4
30
1
±15 ±18
±3.3
±4.5
85
125
100
T Specification same as INA111BP.
NOTE: (1) Temperature coefficient of the “50k” term in the gain equation.
INA111AP, AU
MIN TYP
MAX
UNITS
±200 ± 500/G ±1000 ± 5000/G
µV
±2 ± 20/G
±10 ± 100/G
µV/°C
T T µV/V
T || pF
T || pF
TT
V
75 T
90 T
100 T
100 T
T
T
dB
dB
dB
dB
T pA
T pA
T nV/Hz
T nV/Hz
T nV/Hz
T µVp-p
T fA/Hz
T
T
T
T
T
T
T
T
T
T
T
T
T
0.05
T
±0.7
±2
T
T
T
±0.01
±0.01
±0.04
V/V
V/V
%
%
%
%
ppm/°C
ppm/°C
% of FSR
% of FSR
% of FSR
% of FSR
TT
T
T
V
pF
mA
T MHz
T MHz
T kHz
T kHz
T V/µs
T µs
T µs
T µs
T µs
T µs
TT
T
TV
T mA
T
T
T
T °C
T °C
°C/W
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
INA111
2

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PIN CONFIGURATIONS
Top View
RG 1
V–IN 2
V+IN 3
V– 4
Top View
NC 1
RG 2
NC 3
V–IN
V+IN
4
5
NC 6
V– 7
NC 8
8 RG
7 V+
6 VO
5 Ref
DIP
SOL-16 Surface Mount
16 NC
15 RG
14 NC
13 V+
12 Feedback
11 VO
10 Ref
9 NC
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage .................................................................................. ±18V
Input Voltage Range .......................................... (V–) –0.7V to (V+) +15V
Output Short-Circuit (to ground) .............................................. Continuous
Operating Temperature ................................................. –40°C to +125°C
Storage Temperature ..................................................... –40°C to +125°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
NOTE: Stresses above these ratings may cause permanent damage.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with ap-
propriate precautions. Failure to observe proper handling and
installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
ORDERING INFORMATION
PRODUCT
INA111AP
INA111BP
INA111AU
INA111BU
PACKAGE
8-Pin Plastic DIP
8-Pin Plastic DIP
SOL-16 Surface-Mount
SOL-16 Surface-Mount
TEMPERATURE RANGE
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
PACKAGE INFORMATION
PRODUCT
INA111AP
INA111BP
INA111AU
INA111BU
PACKAGE
8-Pin Plastic DIP
8-Pin Plastic DIP
16-Pin Surface Mount
16-Pin Surface Mount
PACKAGE DRAWING
NUMBER(1)
006
006
211
211
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
®
3 INA111

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TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = ±15V, unless otherwise noted.
GAIN vs FREQUENCY
10k
G = 1k
1k
G = 100
100
G = 10
10
G=1
1
0.1
1k
10k 100k 1M
Frequency (Hz)
10M
120
100
80
60
40
20
0
10
COMMON-MODE REJECTION vs FREQUENCY
100 1k 10k 100k
Frequency (Hz)
G = 1k
G = 100
G = 10
G=1
1M
INPUT COMMON-MODE VOLTAGE RANGE
vs OUTPUT VOLTAGE
15
10
5
+LiOmuittepdutbSy wAi1ng
VD/2
VD/2
+
+
+ OLiumtpiteudt SbwyiAn2g
VO
0 VCM
(Any Gain)
–5 A3 – Output
–10 – OLiumtpituetdSSbwywinAing2g Limit
–15
A3 + Output
Swing Limit
L–imOiutetpdubt ySwAi1ng
–15 –10
–5
0
5 10
Output Voltage (V)
15
120
100
80
60
40
20
0
10
POWER SUPPLY REJECTION vs FREQUENCY
100 1k 10k 100k
Frequency (Hz)
G = 1k
G = 100
G = 10
G=1
1M
INPUT-REFERRED NOISE VOLTAGE vs FREQUENCY
1k
100
100 G = 1
G = 10
10
10 G = 100, 1k
1
1 10 100 1k 10k
Frequency (Hz)
1
1
SETTLING TIME vs GAIN
0.01%
0.1%
10 100
Gain (V/V)
1000
®
INA111
4

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TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, unless otherwise noted.
OFFSET VOLTAGE WARM-UP vs TIME
75
50
25
0
G 10
–25
–50
G=1
–75
0
1 234
Time From Power Supply Turn-On (Minutes)
300
200
100
0
–100
–200
–300
5
10n
1n
100p
INPUT BIAS CURRENT vs TEMPERATURE
Ib
IOS
10p
1p
0.1p
0.01p
–75 –50 –25 0 25 50 75 100 125
Temperature (°C)
–10m
–1m
INPUT BIAS CURRENT
vs DIFFERENTIAL INPUT VOLTAGE
–15.7V
–100µ
–10µ
+1p
G=1
+10p
G = 10 G = 100 G = 1k
G = 1k
G = 10
G = 100
+100p
–20 –15 –10 –5
0
5 10
Differential Overload Voltage (V)
NOTE: One input grounded.
G=1
+15.7V
15 20
–10m
–1m
INPUT BIAS CURRENT
vs COMMON-MODE INPUT VOLTAGE
–15.7V
–100µ
–10µ
+1p
+15.7V
+10p
–20 –15 –10 –5
0
5 10 15 20
Common-Mode Voltage (V)
MAXIMUM OUTPUT VOLTAGE SWING vs FREQUENCY
30
25
20
15
10
5
0
1k 10k 100k 1M 10M
Frequency (Hz)
OUTPUT CURRENT LIMIT vs TEMPERATURE
50
40
30
–ICL
+ICL
20
10
0
–75 –50 –25
0 25 50
Temperature (°C)
75 100 125
®
5 INA111