INA2133UA [BB]
High-Speed, Precision DIFFERENCE AMPLIFIERS; 高速，精密差动放大器
| 型号： | INA2133UA |
| 厂家： | 
BURR-BROWN CORPORATION |
| 描述： | High-Speed, Precision DIFFERENCE AMPLIFIERS |
| 文件： | 总15页 (文件大小：192K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
INA133
IN
A2133
INA2133
IN
A
13
3
For most current data sheet and other product
information, visit www.burr-brown.com
High-Speed, Precision
DIFFERENCE AMPLIFIERS
FEATURES
APPLICATIONS
● DESIGNED FOR LOW COST
● DIFFERENTIAL INPUT AMPLIFIER
BUILDING BLOCK
● SINGLE, DUAL VERSIONS
● DIFF IN/DIFF OUT AMPLIFIER
● UNITY-GAIN INVERTING AMPLIFIER
● GAIN = +1/2 OR G = +2 AMPLIFIER
● SUMMING AMPLIFIER
● LOW OFFSET VOLTAGE DRIFT:
±450µV max, ±5µV/°C max
● LOW GAIN ERROR: 0.05% max
● WIDE BANDWIDTH: 1.5MHz
● HIGH SLEW RATE: 5V/µs
● SYNCHRONOUS DEMODULATOR
● CURRENT/DIFFERENTIAL LINE RECEIVER
● VOLTAGE-CONTROLLED CURRENT SOURCE
● BATTERY POWERED SYSTEMS
● LOW COST AUTOMOTIVE
● FAST SETTLING TIME: 5.5µs to 0.01%
● LOW QUIESCENT CURRENT: 950µA
● WIDE SUPPLY RANGE: ±2.25V to ±18V
● SO-8 and SO-14 PACKAGES
The differential amplifier is the foundation of many
commonly used circuits. The low cost INA133 and
INA2133 provide this precision circuit function without
using an expensive precision network.
DESCRIPTION
The INA133 and INA2133 are high slew rate, unity-
gain difference amplifiers consisting of a precision op
amp with a precision resistor network. The on-chip
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. They operate over a wide
supply range, ±2.25V to ±18V (+4.5V to +36V single
supply), and input common-mode voltage range extends
beyond the positive and negative supply rails.
The single version, INA133, package is the SO-8 surface
mount. The dual version, INA2133, package is the SO-14
surface mount. Both are specified for operation over the
extended industrial temperature range, –40°C to +85°C.
Operation is from –55°C to +125°C.
V+
11
25kΩ
25kΩ
2
12
13
–In A
Sense A
Out A
V+
7
A
25kΩ
25kΩ
2
5
6
1
–In
Sense
Output
25kΩ
25kΩ
25kΩ
3
6
14
10
+In A
–In B
Ref A
25kΩ
Sense B
25kΩ
25kΩ
3
9
8
+In
Ref
Out B
Ref B
B
INA133
4
25kΩ
25kΩ
5
+In B
V–
INA2133
4
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/
•
•
Cable: BBRCORP Telex: 066-6491
•
•
FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1999 Burr-Brown Corporation
PDS-1530A
Printed in U.S.A. June, 1999
SPECIFICATIONS: VS = ±15V
At TA = +25°C, VS = ±15V, RL = 10kΩ connected to ground, and reference pin connected to ground, unless otherwise noted.
INA133U
INA133UA
INA2133U
INA2133UA
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OFFSET VOLTAGE(1)
Initial(1)
vs Temperature
vs Power Supply
vs Time
RTO
VCM = 0V
TA = –40°C to +85°C
VS = ±2.25V to ±18V
±150
±2
±10
0.3
±450
±5
±30
✻
±900
±50
µV
µV/°C
µV/V
µV/√mo
dB
See Typical Curve
900
✻
✻
Channel Separation (dual)
dc
120
INPUT IMPEDANCE(2)
Differential
Common-Mode
50
25
✻
✻
kΩ
kΩ
VCM = 0V
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Positive
Negative
Common-Mode Rejection Ratio
VO = 0V
VO = 0V
VCM = –27V to +27V, RS = 0Ω
2(V+) –3
2(V–) +3
80
2(V+) –2
2(V–) +2
90
✻
✻
74
✻
✻
✻
V
V
dB
OUTPUT VOLTAGE NOISE(3)
f = 0.1Hz to 10Hz
f = 10Hz
f = 100Hz
f = 1kHz
RTO
2
✻
✻
✻
✻
µVp-p
nV/√Hz
nV/√Hz
nV/√Hz
80
60
57
GAIN
Initial
Error
vs Temperature
Nonlinearity
1
✻
✻
✻
V/V
%
ppm/°C
% of FS
VO = –14V to +13.5V
TA = –40°C to +85°C
VO = –14V to +13.5V
±0.02
±1
±0.0001
±0.05
±10
±0.001
±0.1
✻
±0.002
✻
OUTPUT
Voltage Output
Gain Error < 0.1%
RL = 10kΩ to Ground
RL = 10kΩ to Ground
RL = 100kΩ to Ground
RL = 100kΩ to Ground
Positive
Negative
Positive
Negative
(V+) –1.5 (V+)–1.3
✻
✻
✻
✻
✻
✻
✻
✻
V
V
V
V
mA
pF
(V–) +1
(V–)+0.8
(V+)–0.8
(V–)+0.3
–25/+32
1000
Current Limit, Continuous-to-Common
Capacitive Load (stable operation)
FREQUENCY RESPONSE
Small-Signal Bandwidth
Slew Rate
Settling Time: 0.1%
0.01%
–3dB
1.5
5
4
5.5
4
✻
✻
✻
✻
✻
MHz
V/µs
µs
µs
µs
10V Step, CL = 100pF
10V Step, CL = 100pF
50% Overdrive
Overload Recovery Time
POWER SUPPLY
Rated Voltage
±15
✻
V
Operating Voltage Range
Dual Supplies
Single Supply
±2.25
+4.5
±18
+36
±1.2
✻
✻
✻
✻
✻
V
V
mA
Quiescent Current (per amplifier)
IO = 0
±0.95
✻
TEMPERATURE RANGE
Specification
Operation
–40
–55
–55
+85
+125
+125
✻
✻
✻
✻
✻
✻
°C
°C
°C
Storage
Thermal Resistance
SO-8 Surface Mount
SO-14 Surface Mount
θJA
150
100
✻
✻
°C/W
°C/W
✻ Specifications the same as INA133U, INA2133U.
NOTES: (1) Includes the effects of amplifier’s input bias and offset currents. (2) 25kΩ resistors are ratio matched but have ±20% absolute value. (3) Includes effects
of amplifier’s input current noise and thermal noise contribution of resistor network.
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.
®
2
INA133, INA2133
SPECIFICATIONS: VS = ±5V
At TA = +25°C, VS = ±5V, RL = 10kΩ connected to ground, and reference pin connected to ground, unless otherwise noted.
INA133U
INA133UA
INA2133U
INA2133UA
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OFFSET VOLTAGE(1)
Initial(1)
vs Temperature
RTO
VCM = 0V
±300
±2
±750
✻
✻
±1500
µV
µV/°C
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Positive
Negative
Common-Mode Rejection Ratio
VO = 0V
VO = 0V
VCM = –7V to +7V, RS = 0Ω
2(V+) –3
2(V–) +3
80
2(V+) –2
2(V–) +2
90
✻
✻
74
✻
✻
✻
V
V
dB
GAIN
Initial
Gain Error
Nonlinearity
1
✻
✻
✻
V/V
%
% of FS
VO = –4V to 3.5V
VO = –4V to 3.5V
±0.02
±0.0001
±0.05
±0.001
±0.1
±0.002
OUTPUT
Voltage Output
Positive
Gain Error < 0.1%
RL = 10kΩ to Ground
RL = 10kΩ to Ground
RL = 100kΩ to Ground
RL = 100kΩ to Ground
(V+) –1.5 (V+) –1.3
✻
✻
✻
✻
✻
✻
V
V
V
V
Negative
Positive
Negative
(V–) +1
(V–) +0.8
(V+) –0.8
(V–) +0.3
POWER SUPPLY
Rated Voltage
±15
✻
V
Operating Voltage Range
Dual Supplies
Single Supply
±2.25
+4.5
±18
+36
±1.2
✻
✻
✻
✻
✻
V
V
mA
Quiescent Current (per amplifier)
IO = 0
±0.92
✻
✻ Specifications the same as INA133U, INA2133U.
NOTES: (1) Includes the effects of amplifier’s input bias and offset currents.
ABSOLUTE MAXIMUM RATINGS(1)
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.
Supply Voltage, V+ to V– .................................................................... 36V
Input Voltage Range........................................................................ 2 • VS
Output Short-Circuit (to ground)(2) .......................................... Continuous
Operating Temperature .................................................. –55°C to +125°C
Storage Temperature .....................................................–55°C to +125°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s)............................................... +300°C
NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. (2) One channel per package.
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.
PACKAGE/ORDERING INFORMATION
PACKAGE
SPECIFIED
DRAWING
NUMBER(1)
TEMPERATURE
RANGE
PACKAGE
MARKING
ORDERING
NUMBER(2)
TRANSPORT
MEDIA
PRODUCT
PACKAGE
Single
INA133U
SO-8 Surface Mount
182
"
–40°C to +85°C
INA133U
INA133U
INA133U/2K5
INA133UA
Rails
"
INA133UA
"
"
"
"
Tape and Reel
Rails
SO-8 Surface Mount
182
–40°C to +85°C
INA133UA
"
"
"
"
INA133UA/2K5
Tape and Reel
Dual
INA2133U
SO-14 Surface Mount
235
"
–40°C to +85°C
INA2133U
INA2133U
INA2133U/2K5
INA2133UA
Rails
"
"
"
"
Tape and Reel
Rails
INA2133UA
SO-14 Surface Mount
235
–40°C to +85°C
INA2133UA
"
"
"
"
"
INA2133UA/2K5
Tape and Reel
NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with a slash (/) are
available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of “INA133UA/2K5” will get a single
2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book.
®
3
INA133, INA2133
PIN CONFIGURATIONS
Top View
SO-8
Top View
SO-14
INA2133
1
2
3
4
5
6
7
14
13
12
11
INA133
NC
Ref A
Out A
Sense A
V+
–In A
+In A
V–
1
2
3
4
NC
Ref
–In
+In
V–
8
7
6
5
A
V+
Output
Sense
+In B
–In B
NC
10 Sense B
B
9
8
Out B
Ref B
NC = No Connection
NC = No Connection
®
4
INA133, INA2133
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = ±15V, RL = 10kΩ connected to ground, and reference pin connected to ground, unless otherwise noted.
GAIN vs FREQUENCY
COMMON-MODE REJECTION vs FREQUENCY
10
0
100
90
80
70
60
50
40
+125°C
+25°C
–55°C
–10
–20
–30
–40
–50
VS = ±15V or ±5V
VS = ±15V or ±5V
10k
100k
Frequency (Hz)
1M
10M
100
1k
10k
100k
1M
Frequency (Hz)
CHANNEL SEPARATION vs FREQUENCY
POWER SUPPLY REJECTION vs FREQUENCY
130
120
110
100
90
120
100
80
–PSRR
60
+PSRR
40
INA2133
20
1
10
100
1k
10k
100k
100
1k
10k
100k
Frequency (Hz)
Frequency (Hz)
INPUT COMMON-MODE VOLTAGE
vs OUTPUT VOLTAGE
TOTAL HARMONIC DISTORTION+NOISE
vs FREQUENCY
40
30
0.1
VS = ±15V
500kHz Filter
20
10
0
0.01
–10
–20
–30
–40
VS = ±5V
0.001
–15
–10
–5
0
5
10
15
20
100
1k
10k 20k
Output Voltage (V)
Frequency (Hz)
®
5
INA133, INA2133
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, RL = 10kΩ connected to ground, and reference pin connected to ground, unless otherwise noted.
0.1Hz TO 10Hz PEAK-TO-PEAK
VOLTAGE NOISE
VOLTAGE NOISE DENSITY vs FREQUENCY
1000
100
10
1
10
100
1k
10k
500µs/div
Frequency (Hz)
QUIESCENT CURRENT vs TEMPERATURE
Per Amplifier
SLEW RATE vs TEMPERATURE
1400
1300
1200
1100
1000
900
7
6
5
4
3
VS = ±15V
VS = ±5V
–SR
+SR
800
700
–75
–50
–25
0
25
50
75
100
125
–75
–50
–25
0
25
50
75
100
125
Temperature (°C)
Temperature (°C)
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
SHORT-CIRCUIT CURRENT vs TEMPERATURE
VS = ±15V
(V+)
40
35
30
25
20
15
–40°C
VS = ±5V
(V+) –5
(V+) –10
0
+ISC
25°C
85°C
–ISC
85°C
25°C
(V–) +10
(V–) +5
V–
+ISC
–ISC
–40°C
0
±5
±10
±15
±20
±25
±30
±35
–75
–50
–25
0
25
50
75
100
125
Output Current (mA)
Temperature (°C)
®
6
INA133, INA2133
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, RL = 10kΩ connected to ground, and reference pin connected to ground, unless otherwise noted.
OFFSET VOLTAGE PRODUCTION DISTRIBUTION
OFFSET VOLTAGE PRODUCTION DISTRIBUTION
S = ±5V
VS = ±15V
V
35
30
25
20
15
10
5
30
25
20
15
10
5
Typical production
distribution of
packaged units.
Singles and duals
included.
Typical production
distribution of
packaged units.
Singles and duals
included.
0
0
Offset Voltage (µV)
Offset Voltage (µV)
OFFSET VOLTAGE DRIFT
OFFSET VOLTAGE DRIFT
PRODUCTION DISTRIBUTION
PRODUCTION DISTRIBUTION
VS = ±15V
V
S = ±5V
50
45
40
35
30
25
20
15
10
5
60
50
40
30
20
10
0
Typical production
distribution of
packaged units.
Singles and duals
included.
Typical production
distribution of
packaged units.
Singles and duals
included.
0
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
Offset Voltage Drift (µV/°C)
Offset Voltage Drift (µV/°C)
SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE
SETTLING TIME vs LOAD CAPACITANCE
14
60
50
40
30
20
10
0
VS = ±5V
VS = ±15V
–Overshoot
VS = ±15V
VS = ±5V
12
10
8
+Overshoot
–Overshoot
0.01%
6
4
+Overshoot
10V Step
0.1%
2
0
100
1k
10k
100
1k
10k
100k
Capacitive Load (pF)
Load Capacitance (pF)
®
7
INA133, INA2133
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, RL = 10kΩ connected to ground, and reference pin connected to ground, unless otherwise noted.
LARGE-SIGNAL STEP RESPONSE
SMALL-SIGNAL STEP RESPONSE
CL = 100pF
CL = 1000pF
CL = 1000pF
2.5µs/div
2.5µs/div
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
VS = ±15V
32
28
24
20
16
12
8
VS = ±5V
4
0
10k
100k
1M
Frequency (Hz)
®
8
INA133, INA2133
changed, pins 2 and 5 must also be interchanged to maintain
proper ratio matching.
APPLICATIONS INFORMATION
The INA133 and INA2133 are high-speed difference ampli-
fiers suitable for a wide range of general purpose applica-
tions. Figure 1 shows the basic connections required for
operation of the INA133. Decoupling capacitors are strongly
recommended in applications with noisy or high impedance
power supplies. The capacitors should be placed close to the
device pins as shown in Figure 1. All circuitry is completely
independent in the dual version assuring lowest crosstalk
and normal behavior when one amplifier is overdriven or
short-circuited.
OPERATING VOLTAGE
The INA133 and INA2133 operate from single (+4.5V to
+36V) or dual (±2.25V to ±18V) supplies with excellent
performance. Specifications are production tested with ±5V
and ±15V supplies. Most behavior remains unchanged
throughout the full operating voltage range. Parameters which
vary significantly with operating voltage are shown in the
Typical Performance Curves.
As shown in Figure 1, the differential input signal is con-
nected to pins 2 and 3. The source impedances connected to
the inputs must be nearly equal to assure good common-
mode rejection. A 5Ω mismatch in source impedance will
degrade the common-mode rejection of a typical device to
approximately 80dB (a 10Ω mismatch degrades CMR to
74dB). If the source has a known impedance mismatch, an
additional resistor in series with the opposite input can be
used to preserve good common-mode rejection.
INPUT VOLTAGE
The INA133 and INA2133 can accurately measure differen-
tial signals that are above and below the supply rails. Linear
common-mode range extends from 2 • (V+)–3V to 2 • (V–)
+3V (nearly twice the supplies). See the typical performance
curve, “Input Common-Mode Voltage vs Output Voltage.”
OFFSET VOLTAGE TRIM
The INA133’s internal resistors are accurately ratio trimmed
to match. That is, R1 is trimmed to match R2 and R3 is
trimmed to match R4. However, the absolute values may not
be equal (R1 + R2 may be slightly different than R3 + R4).
Thus, large series resistors on the input (greater than 250Ω),
even if well matched, will degrade common-mode rejection.
The INA133 and INA2133 are laser trimmed for low offset
voltage and drift. Most applications require no external offset
adjustment. Figure 2 shows an optional circuit for trimming
the output offset voltage. The output is referred to the output
reference terminal (pin 1), which is normally grounded. A
voltage applied to the Ref terminal will be summed with the
output signal. This can be used to null offset voltage as
shown in Figure 2. The source impedance of a signal applied
to the Ref terminal should be less than 10Ω to maintain good
common-mode rejection.
Circuit board layout constraints might suggest possible varia-
tions in connections of the internal resistors. For instance, it
appears that pins 1 and 3 could be interchanged. However,
because of the ratio trimming technique used (see paragraph
above) CMRR will be degraded. If pins 1 and 3 are inter-
INA133
R1
R2
V–
V+
2
5
6
V2
1µF
1µF
4
7
VO
INA133
R1
R2
25kΩ
25kΩ
10
R3
Ω
–In
V2
2
5
6
3
V3
R4
+15V
V
OUT = V3 – V2
Gain Error = ±0.01%
CMR = 90dB
Nonlinearity = ±0.0001%
1
R3
25kΩ
R4
25kΩ
V
O = V3 – V2
150k
Ω
Offset Adjustment
Range = ±1mV
+In
V3
100k
Ω
1
3
10
Ω
–15V
FIGURE 1. Precision Difference Amplifier (Basic Power
Supply and Signal Connections).
FIGURE 2. Offset Adjustment.
®
9
INA133, INA2133
TYPICAL APPLICATIONS
V1
INA133
V+
V+
–In
A1
3
INA133
2
5
2
R2
5
7
6
6
R1
VO
R2
1
3
VO = (V+)/2
A2
V2
+In
VO = (1 + 2R2/R1) (V2 –V1)
1
4
Common
Common
The INA133 can be combined with op amps to form a complete instrumenta-
tion amplifier with specialized performance characteristics. Burr-Brown offers
many complete high performance IAs. Products with related performances
are shown at the right in the table below.
FIGURE 5. Pseudoground Generator.
SIMILAR COMPLETE
A1, A2
FEATURE
BURR-BROWN IA
OPA2227
OPA129
OPA2277
OPA2130
OPA2234
OPA2237
Low Noise
INA103
Ultra Low Bias Current (fA)
Low Offset Drift, Low Noise
Low Power, FET-Input (pA)
Single Supply, Precision, Low Power
Single Supply, Low Power, MSOP-8
INA116
INA133
INA114, INA128
INA121
2
5
6
V2
INA122, INA118
INA122, INA126
VO = –V2
FIGURE 3. Precision Instrumentation Amplifier.
INA133
2
5
6
1
1
3
100Ω(1)
1%
Gain Error = 0.05% maximum
Nonlinearity = 0.001% maximum
Gain Drift = 1ppm/°C
V–
V0
0 to 2V
100Ω(1)
1%
3
FIGURE 6. Precision Unity-Gain Inverting Amplifier.
IIN
0 to 20mA
NOTE: (1) Input series resistors should be less than
250Ω (1% max mismatch) to maintain excellent CMR.
With 100Ω resistors, gain error is increased to 0.5%.
FIGURE 4. Current Receiver with Compliance to Rails.
®
10
INA133, INA2133
INA133
INA133
2
5
2
5
6
VO = 2 • V1
1
3
6
V3
2
VO
=
3
V3
V1
±0.05% max
1
Gain Error = 0.025% maximum
Gain Drift = 2ppm/°C
FIGURE 7. Precision Gain = 2 Amplifier.
FIGURE 8. Precision Gain = 1/2 Amplifier.
INA133
INA133
2
2
5
6
5
6
(V1 + V3)
=
VO = V1 + V3
VO
1
1
2
V1
V3
V1
±0.05% max
±0.05% max
V3
3
3
FIGURE 9. Precision Average Value Amplifier.
FIGURE 10. Precision Summing Amplifier.
INA133
2
5
R1
R2
Output
6
(1)
1
2
5
INA133
Device
VFC320 0-10kHz
VFC100 0-FCLOCK/2
DAC80 0-FS (12 bits)
DAC703 0-FS (16 bits)
XTR110 4-20mA
Output
3
Ref
6
VO
1
3
V1
V3
OPA277
For G = 10,
See INA143.
VO
=
(
1 +
)( V + V
)
R2
R1
1
3
Ref must be driven
by low impedance.
2
Voltage
Source
NOTE: (1) Unipolar Input Device.
FIGURE 11. Precision Bipolar Offsetting.
FIGURE 12. Precision Summing Amplifier with Gain.
®
11
INA133, INA2133
1
Noise (60Hz hum)
INA115
4
2
A1
Transducer or
Analog Signal
25kΩ
Feedback
12
3
25kΩ
25kΩ
25kΩ
25kΩ
A
3
RG
Output
11
14
50kΩ
RG
G = 1 +
15
5
A2
25kΩ
Noise (60Hz hum)
100k
Ω
Shield
13
V+
7
8
10 Ref
V–
3
INA133
2
5
6
1
FIGURE 13. Instrumentation Amplifier Guard Drive Generator.
1/2 INA2133
2
12
13
1/2 INA2133
6
10
9
A
3
V1
V2
B
VO = V3 + V4 – V1 – V2
14
5
8
V3
V4
FIGURE 14. Precision Summing Instrumentation Amplifier.
®
12
INA133, INA2133
INA133
1/2 INA2133
2
5
6
1
V2
R
R
2
12
13
14
A
V1
V01
3
V1
3
IO = (V1 – V2) (1/25k + 1/R)
Load
IO
V2
1/2 INA2133
FIGURE 15. Precision Voltage-to-Current Converter with
Differential Inputs.
6
10
9
INA133
B
V02
2
5
6
V2
8
5
R
V01 – V02 = 2 (V2 – V1)
3
OPA131
V3
1
FIGURE 18. Differential Output Difference Amplifier.
IO
IO = (V3 – V2)/R
Load
INA133
2
5
6
1
FIGURE 16. Differential Input Voltage-to-Current Con-
V2
verter for Low IOUT
.
INA133
R
(R ≥ 200Ω)
2
5
6
1
V2
3
V3
Gate can be
+VCC –5V
R
R
R < 200Ω
(V3 – V2)
R
Load
IO
IO
=
Gate can be
+VS –5V
3
V3
I
O = (V3 – V2) (1/25k + 1/R)
FIGURE 19. Isolating Current Source with Buffering Am-
plifier for Greater Accuracy.
Load
IO
FIGURE 17. Isolating Current Source.
®
13
INA133, INA2133
+5V
7
VS
INA133
2
5
6
1
Transducer
or
Analog
Signal
12 Bits
Out
ADS7806
0V-4V
Input
3
4
–5V
Eliminates errors due to different grounds.
FIGURE 20. Differential Input Data Acquisition.
INA133
2
5
6
V1
VO
DG188
3
1
Logic In
VO
–V1
+V1
1
0
1
Logic
In
FIGURE 21. Digitally Controlled Gain of ±1 Amplifier.
INA133
R1
R2
2
5
10pF
D1
6
R3
R4
V0 = |V1|
3
D2
OPA130
1
V1
Input
R5
2kΩ
FIGURE 22. Precision Absolute Value Buffer.
®
14
INA133, INA2133
+15V
2
+10V Out
–10V Out
BUF634 inside feedback
loop contributes no error.
6
INA133
2
3
5
6
REF102
–In
+In
INA133
2
5
6
BUF634
VO
4
1
3
RL
1
FIGURE 23. ±10V Precision Voltage Reference.
FIGURE 24. High Output Current Precision Difference
Amplifier.
V+
12.5kΩ
50kΩ
1kΩ
0V to 10V
In
7
INA133
2
5
OPA227
+15V
V2
2
25kΩ
25kΩ
25kΩ
R1
50.1Ω
6
2N3904
Set R1 = R2
R2
6
10V
REF102
For 4-20mA applications,
the REF102 sets the 4mA
low-scale output for 0V input.
25kΩ
50.1Ω
3
1
V3
4
RLOAD
4
IO = 4 to 20mA
1
1
IO = V3 – V2
+
25kΩ R2
FIGURE 25. Precision Voltage-to-Current Conversion.
®
15
INA133, INA2133
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