BB INA106KP

®
INA106
INA
106
INA
106
Precision Gain = 10
DIFFERENTIAL AMPLIFIER
FEATURES
APPLICATIONS
● ACCURATE GAIN: ±0.025% max
● HIGH COMMON-MODE REJECTION:
86dB min
● NONLINEARITY: 0.001% max
● EASY TO USE
● PLASTIC 8-PIN DIP, SO-8 SOIC
PACKAGES
●
●
●
●
●
G = 10 DIFFERENTIAL AMPLIFIER
G = +10 AMPLIFIER
G = –10 AMPLIFIER
G = +11 AMPLIFIER
INSTRUMENTATION AMPLIFIER
DESCRIPTION
The INA106 is a monolithic Gain = 10 differential
amplifier consisting of a precision op amp and on-chip
metal film resistors. The resistors are laser trimmed
for accurate gain and high common-mode rejection.
Excellent TCR tracking of the resistors maintains
gain accuracy and common-mode rejection over
temperature.
The differential amplifier is the foundation of many
commonly used circuits. The INA106 provides this
precision circuit function without using an expensive
resistor network. The INA106 is available in 8-pin
plastic DIP and SO-8 surface-mount packages.
–In
2
R1
10kΩ
R2
100kΩ
5
7
6
4
+In
3
R3
10kΩ
R4
100kΩ
1
Sense
V+
Output
V–
Reference
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
©
1987 Burr-Brown Corporation
PDS-729F
Printed in U.S.A. August, 1998
SPECIFICATIONS
ELECTRICAL
At +25°C, VS = ±15V, unless otherwise specified.
INA106KP, U
PARAMETER
CONDITIONS
MIN
GAIN
Initial(1)
Error
vs Temperature
Nonlinearity(2)
TYP
10
0.01
–4
0.0002
OUTPUT
Related Voltage
Rated Current
Impedance
Current Limit
Capacitive Load
IO = +20mA, –5mA
VO = 10V
10
+20, –5
Voltage Range
Common-Mode Rejection(3)
OFFSET VOLTAGE
Initial
vs Temperature
vs Supply
vs Time
NOISE VOLTAGE
fB = 0.01Hz to 10Hz
fO = 10kHz
DYNAMIC RESPONSE
Small Signal
Full Power BW
Slew Rate
Settling Time: 0.1%
0.01%
0.01%
POWER SUPPLY
Rated
Voltage Range
Quiescent Current
0.025
0.001
12
Differential
Common-Mode
Differential
Common-Mode
TA = TMIN to TMAX
10
110
±1
±11
86
UNITS
V/V
%
ppm/°C
%
V
mA
Ω
mA
pF
0.01
+40/–10
1000
To Common
Stable Operation
INPUT
Impedance
MAX
kΩ
kΩ
V
V
dB
100
RTI(4)
50
0.2
1
10
±VS = 6V to 18V
200
10
µV
µV/°C
µV/V
µV/mo
RTI(5)
–3dB
VO = 20Vp-p
30
2
VO = 10V Step
VO = 10V Step
VCM = 10V Step, VDIFF = 0V
±5
Derated Performance
VO = 0V
TEMPERATURE RANGE
Specification
Operation
Storage
0
–40
–65
1
30
µVp-p
nV/√Hz
5
50
3
5
10
5
MHz
kHz
V/µs
µs
µs
µs
±15
±1.5
±18
±2
V
V
mA
+70
+85
+150
°C
°C
°C
NOTES: (1) Connected as difference amplifier (see Figure 1). (2) Nonlinearity is the maximum peak deviation from the best-fit straight line as a percent of full-scale peakto-peak output. (3) With zero source impedance (see “Maintaining CMR” section). (4) Includes effects of amplifiers’s input bias and offset currents. (5) Includes effect
of amplifier’s input current noise and thermal noise contribution of resistor network.
®
INA106
2
ELECTROSTATIC
DISCHARGE SENSITIVITY
PIN CONFIGURATION
Top View
DIP/SOIC
• (1)
Ref
1
–In
2
+In
3
V–
4
10kΩ
8
NC
7
V+
6
Output
5
Sense
This integral circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
100kΩ
10kΩ
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
published specifications.
100kΩ
INA106
NOTE: (1) Pin 1 indentifier for SO-8 package.
Model number identification may be abbreviated
on SO-8 package due to limited available space.
PACKAGE/ORDERING INFORMATION
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage ...................................................................... ±18V
Input Voltage Range ............................................................................ ±VS
Operating Temperature Range: P, U ................................ –40°C to +85°C
Storage Temperature Range ............................................ –40°C to +85°C
Lead Temperature (soldering, 10s): P .......................................... +300°C
Wave Soldering (3s, max) U .......................................................... +260°C
Output Short Circuit to Common .............................................. Continuous
PRODUCT
PACKAGE
PACKAGE
DRAWING
NUMBER(1)
INA106KP
INA106U
8-Pin Plastic DIP
SO-8 Surface Mount
006
182
TEMPERATURE
RANGE
0°C to +70°C
0°C to +70°C
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
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.
®
3
INA106
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = ±15V, unless otherwise noted.
SMALL SIGNAL RESPONSE
(No Load)
STEP RESPONSE
Output Voltage (mV)
50
0
–50
2µs/div
2µs/div
TOTAL HARMONIC DISTORTION AND NOISE
vs FREQUENCY
SMALL SIGNAL RESPONSE
(RLOAD = ∞, CLOAD = 100pF)
1
A = 20dB, 3Vrms, 10kΩ load
THD + N (%)
Output Voltage (mV)
50
0
0.1
Inverting
Noninverting
0.01
–50
30kHz low-pass filtered
0.001
1k
2µs/div
10k
100k
Frequency (Hz)
MAXIMUM VOUT vs IOUT
(Negative Swing)
MAXIMUM VOUT vs IOUT
(Positive Swing)
–17.5
17.5
VS = ±18V
–15
15
VS = ±15V
–10
VS = ±12V
12.5
VOUT (V)
VOUT (V)
VS = ±18V
–12.5
–7.5
–5
VS = ±15V
10
VS = ±12V
7.5
5
VS = ±5V
–2.5
2.5
0
VS = ±5V
0
–2
0
–4
–6
–8
–10
–12
0
–IOUT (mA)
12
18
IOUT (mA)
®
INA106
6
4
24
30
36
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, unless otherwise noted.
POWER SUPPLY REJECTION
vs FREQUENCY
110
140
100
120
PSRR (dB)
CMR (dB)
CMR vs FREQUENCY
90
80
70
100
V–
80
60
V+
60
40
10
100
1k
10k
100k
1
10
Frequency (Hz)
100
1k
10k
100k
Frequency (Hz)
APPLICATIONS INFORMATION
Figure 1 shows the basic connections required for operation
of the INA106. Power supply bypass capacitors should be
connected close to the device pins as shown.
V–
Ref terminal will be summed with the output signal. The
source impedance of a signal applied to the Ref terminal
should be less than 10Ω to maintain good common-mode
rejection.
V+
1µF
Figure 2 shows a voltage applied to pin 1 to trim the offset
voltage of the INA106. The known 100Ω source impedance
of the trim circuit is compensated by the 10Ω resistor in
series with pin 3 to maintain good CMR.
1µF
4
7
INA106
V2
2
R2
100kΩ
R1
10kΩ
5
INA106
R2
R1
V3
3
R3
10kΩ
2
V2
6
+
–
5
VOUT = 10(V3 –V2)
10Ω
R4
100kΩ
V3
1
3
6
R3
Compensates for
some impedance
at pin 1. See text.
R4
+15V
1
499kΩ
VO = V2 – V3
Offset Adjustment Range = ±3mV
FIGURE 1. Basic Power Supply and Signal Connections.
VO
100kΩ
100Ω
The differential input signal is connected to pins 2 and 3 as
shown. The source impedance connected to the inputs must
be equal to assure good common-mode rejection. A 5Ω
mismatch in source impedance will degrade the commonmode rejection of a typical device to approximately 86dB. If
the source has a known source impedance mismatch, an
additional resistor in series with one input can be used to
preserve good common-mode rejection.
–15V
FIGURE 2. Offset Adjustment.
Referring to Figure 1, the CMR depends upon the match of
the internal R4/R3 ratio to the R1/R2 ratio. A CMR of 106dB
requires resistor matching of 0.005%. To maintain high
CMR over temperature, the resistor TCR tracking must be
better than 2ppm/°C. These accuracies are difficult and
expensive to reliably achieve with discrete components.
The output is referred to the output reference terminal
(pin 1) which is normally grounded. A voltage applied to the
®
5
INA106
INA106
V1
10Ω
10kΩ
2
E1
–In
100kΩ
5
A1
E0
6
2
R2
Gain
Adjust
200Ω
INA106
5
6
R1
E0
Output
R2
V2
10Ω
10kΩ
3
100kΩ
1
3
CMR
Adjust
200Ω
A2
To eliminate adjustment interactions,
first adjust gain with V2 grounded.
To make a high performance high gain instrumentation amplifier, the INA106
can be combined with state-of-the-art op amps. For low source impedance
applications, OPA37s will give the best noise, offset, and temperature drift. At
source impedances above about 10kΩ, the bias current noise of the OPA37
reacting with input impedance degrades noise. For these applications, use an
OPA111 or a dual OPA2111 FET input op amp for lower noise. For an
electrometer grade IA, use the OPA128—see table below.
INA106
10kΩ
100kΩ
2
E0 = 10(1 + 2R2 /R1) (E2 – E1)
E2
+In
FIGURE 3. Difference Amplifier with Gain and CMR Adjust.
V2
5
6
Using the INA106 for the difference amplifier also extends the input commonmode range of the instrumentation amplifier to ±10V. A conventional IA with
a unity-gain difference amplifier has an input common-mode range limited to
±5V for an output swing of ±10V. This is because a unity-gain difference amp
needs ±5V at the input for 10V at the output, allowing only 5V additional for
common-mode.
VO
VO = –10V2
10kΩ
100kΩ
3
1
1
A1, A2
R1
(Ω)
R2
(kΩ)
GAIN
(V/V)
CMRR
(dB)
Ib (pA)
NOISE AT 1kHz
(nV/ √Hz)
OPA37A
OPA111B
OPA128LM
50.5
202
202
2.5
10
10
1000
1000
1000
128
110
118
40000
1
0.075
4
10
38
FIGURE 6. Precision Instrumentation Amplifier.
Gain Error = 0.01% maximum
Nonlinearity = 0.001% maximum
Gain Drift = 2.ppm/°C
INA106
FIGURE 4. Precision G = –10 Inverting Amplifier.
2
INA106
2
R2
100kΩ
R1
10kΩ
V1
1
R4
100kΩ
1
5
V0
6
V0 = V1 + 10 V3
6
R3
10kΩ
3
VO
FIGURE 7. Precision Summing Amplifier.
VO = VIN
±100V
Safe Input
R2
100kΩ
R4
100kΩ
5
V3
VIN
R1
10kΩ
R3
10kΩ
INA106
2
3
5
This circuit follows an 11/1 divider with a gain of 11 for an overall gain of unity.
With an 11/1 divider, the input signal can exceed 100V without damage.
6
FIGURE 5. Voltage Follower with Input Protection.
1
VIN
VO = 11VIN
3
FIGURE 8. Precision G = 11 Buffer.
®
INA106
6
VO
Gain Error =
0.01% maximum