Precision Unity Gain DIFFERENTIAL AMPLIFIER INA105

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®
INA105
Precision Unity Gain
DIFFERENTIAL AMPLIFIER
FEATURES
APPLICATIONS
● CMR 86dB min OVER TEMPERATURE
● DIFFERENTIAL AMPLIFIER
● GAIN ERROR: 0.01% max
● NONLINEARITY: 0.001% max
● INSTRUMENTATION AMPLIFIER
BUILDING BLOCK
● NO EXTERNAL ADJUSTMENTS
REQUIRED
● EASY TO USE
● UNITY-GAIN INVERTING AMPLIFIER
● GAIN-OF-1/2 AMPLIFIER
● NONINVERTING GAIN-OF-2 AMPLIFIER
● COMPLETE SOLUTION
● HIGHLY VERSATILE
● AVERAGE VALUE AMPLIFIER
● ABSOLUTE VALUE AMPLIFIER
● LOW COST
● PLASTIC DIP, TO-99 HERMETIC METAL,
AND SO-8 SOIC PACKAGES
● SUMMING AMPLIFIER
● SYNCHRONOUS DEMODULATOR
● CURRENT RECEIVER WITH COMPLIANCE
TO RAILS
● 4mA TO 20mA TRANSMITTER
● VOLTAGE-CONTROLLED CURRENT
SOURCE
● ALL-PASS FILTERS
DESCRIPTION
The INA105 is a monolithic Gain = 1 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 INA105 provides this
precision circuit function without using an expensive
precision resistor network. The INA105 is available in
8-pin plastic DIP, SO-8 surface-mount and TO-99
metal packages.
–In
2
25kΩ
25kΩ
5
7
6
4
+In
3
25kΩ
25kΩ
1
Sense
V+
Output
V–
Ref
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
©
1985 Burr-Brown Corporation
PDS-617G
Printed in U.S.A. August, 1993
SPECIFICATIONS
ELECTRICAL
At +25°C, VCC = ±15V, unless otherwise noted.
INA105AM
PARAMETER
CONDITIONS
MIN
GAIN
Initial(1)
Error
vs Temperature
Nonlinearity(2)
OUTPUT
Rated Voltage
Rated Current
Impedance
Current Limit
Capacitive Load
IO = +20mA, –5mA
VO = 10V
To Common
Stable Operation
INPUT
Impedance(3)
Differential
Common-Mode
Differential
Common-Mode
TA = TMIN to TMAX
Voltage Range(4)
Common-Mode
10
+20, –5
Rejection(5)
TYP
MAX
1
0.005
1
0.0002
0.01
5
0.001
MIN
✻
✻
12
INA105KP, KU
TYP
MAX
✻
✻
✻
✻
✻
✻
✻
✻
MIN
✻
✻
TYP
MAX
UNITS
✻
0.01
✻
✻
0.025
✻
✻
V/V
%
ppm/°C
%
✻
0.01
+40/–10
1000
✻
✻
✻
✻
✻
✻
50
50
✻
✻
✻
✻
✻
✻
86
90
✻
✻
72
100
V
mA
Ω
mA
pF
kΩ
kΩ
V
V
dB
✻
RTO(6), (7)
OFFSET VOLTAGE
Initial
vs Temperature
vs Supply
vs Time
50
5
1
20
±VS = 6V to 18V
✻
5
✻
✻
250
20
25
✻
10
15
✻
✻
✻
✻
500
✻
✻
µV
µV/°C
µV/V
µV/mo
RTO(6), (8)
OUTPUT NOISE VOLTAGE
fB = 0.01Hz to 10Hz
fO = 10kHz
DYNAMIC RESPONSE
Small Signal Bandwidth
Full Power Bandwidth
Slew Rate
Settling Time: 0.1%
0.01%
0.01%
±10
±20
80
INA105BM
✻
✻
2.4
60
–3dB
VO = 20Vp-p
30
2
VO = 10V Step
VO = 10V Step
VCM = 10V Step, VDIFF = 0V
POWER SUPPLY
Rated
Voltage Range
Quiescent Current
Derated Performance
VO = 0V
TEMPERATURE RANGE
Specification
Operation
Storage
±5
–40
–55
–65
1
50
3
4
5
1.5
±15
±1.5
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
±18
±2
✻
+85
+125
+150
✻
✻
✻
✻
✻
✻
µVp-p
nV/√Hz
✻
✻
✻
✻
✻
✻
MHz
kHz
V/µs
µs
µs
µs
✻
✻
✻
✻
✻
✻
✻
✻
–40
–40
✻
✻
✻
V
V
mA
✻
+85
+125
°C
°C
°C
✻ Specification same as for INA105AM.
NOTES: (1) Connected as difference amplifier (see Figure 4). (2) Nonlinearity is the maximum peak deviation from the best-fit straight line as a percent of full-scale peakto-peak output. (3) 25kΩ resistors are ratio matched but have ±20% absolute value. (4) Maximum input voltage without protection is 10V more than either ±15V supply
(±25V). Limit IIN to 1mA. (5) With zero source impedance (see “Maintaining CMR” section). (6) Referred to output in unity-gain difference configuration. Note that this
circuit has a gain of 2 for the operational amplifier’s offset voltage and noise voltage. (7) Includes effects of amplifier’s input bias and offset currents. (8) 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.
®
INA105
2
PIN CONFIGURATIONS
Top View
TO-99
Tab
Top View
DIP/SOIC
No Internal
Connection
8
Ref
1
V+
7
Ref
1
8
No Internal Connection
(1)
–In
2
6
3
–In
2
7
V+
+In
3
6
Output
V–
4
5
Sense
Output
5
Sense
+In
4
INA105AM
INA105BM
V–
Case internally connected to V–. Make no connection.
NOTE: (1) Performance grade identifier box for small outline surface mount.
Blank indicates K grade. Part is marked INA105U.
ABSOLUTE MAXIMUM RATINGS
ELECTROSTATIC
DISCHARGE SENSITIVITY
Supply ................................................................................................ ±18V
Input Voltage Range ............................................................................ ±VS
Operating Temperature Range: M .................................. –55°C to +125°C
P, U ................................ –40°C to +85°C
Storage Temperature Range: M ..................................... –65°C to +150°C
P, U ................................. –40°C to +125°C
Lead Temperature (soldering, 10s) M, P ....................................... +300°C
Wave Soldering (3s, max) U .......................................................... +260°C
Output Short Circuit to Common .............................................. Continuous
This integrated 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.
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
PRODUCT
PACKAGE
PACKAGE
DRAWING
NUMBER(1)
INA105AM
INA105BM
INA105KP
INA105KU
TO-99 Metal
TO-99 Metal
8-Pin Plastic DIP
8-Pin SOIC
001
001
006
182
TEMPERATURE
RANGE
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
®
3
INA105
TYPICAL PERFORMANCE CURVES
At TA = 25°C, VS = ±15V, unless otherwise noted.
SMALL SIGNAL RESPONSE
(No Load)
Output Voltage (V)
–10 to +10
Output Voltage (mV)
STEP RESPONSE
0
4
8
12
+50
0
–50
0
16
5
10
Time (µs)
Time (µs)
MAXIMUM VOUT vs IOUT
(Negative Swing)
SMALL SIGNAL RESPONSE
(RLOAD = ∞ Ω, CLOAD = 1000pF)
–17.5
VS = ±18V
+50
VOUT (V)
Output Voltage (mV)
–15
0
–12.5
VS = ±15V
–10
VS = ±12V
–7.5
–5
–50
VS = ±5V
–2.5
0
5
0
10
0
–2
–4
–6
–IOUT (mA)
Time (µs)
MAXIMUM VOUT vs IOUT
(Positive Swing)
–8
–10
–12
CMR vs FREQUENCY
110
17.5
VS = ±18V
15
BM
CMR (dB)
12.5
VOUT (V)
100
VS = ±15V
VS = ±12V
10
7.5
AM, KP, U
90
80
5
VS = ±5V
70
2.5
60
0
6
0
12
18
IOUT (mA)
24
30
10
36
®
INA105
4
100
1k
Frequency (Hz)
10k
100k
TYPICAL PERFORMANCE CURVES (CONT)
At TA = 25°C, VS = ±15V, unless otherwise noted.
COMMON-MODE INPUT RANGE vs SUPPLY
(Difference Amplifier Connected, VOUT = 0)
140
36
120
30
Input Range (V)
PSRR (dB)
POWER SUPPLY REJECTION
vs FREQUENCY
100
V–
80
60
V+
10
100
1k
Frequency (Hz)
Negative CMV
18
Positive CMV
12
6
40
1
24
10k
0
100k
±6
±3
APPLICATION INFORMATION
±9
±12
±15
Supply Voltage (V)
±21
V+
V–
Figure 1 shows the basic connections required for operation
of the INA105. Power supply bypass capacitors should be
connected close to the device pins.
±18
1µF
1µF
7
4
INA105
The differential input signal is connected to pins 2 and 3 as
shown. 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. If the source has a known mismatch in source impedance, an additional resistor in series with one input can be
used to preserve good common-mode rejection.
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.
Do not interchange pins 1 and 3 or pins 2 and 5, even though
nominal resistor values are equal. These resistors are laser
trimmed for precise resistor ratios to achieve accurate gain
and highest CMR. Interchanging these pins would not provide specified performance.
V2
2
R1
R2
25kΩ
V3
3
5
25kΩ
6
R3
VOUT = V3 – V2
25kΩ
R4
25kΩ
1
FIGURE 1. Basic Power Supply and Signal Connections.
®
5
INA105
V1
INA105
R1
2
V2
–In
R2
INA105
A1
5
6
5
2
R2
VO
6
R1
10Ω
V3
V0
0utput
R2
R3
3
1
3
R4
+15V
499kΩ
VO = (1 + 2R2/R1) (V2 –V1)
100kΩ
For low source impedance applications, an input stage using OPA27 op
amps will give the best low noise, offset, and temperature drift performance.
At source impedances above about 10kΩ, the bias current noise of the
OPA27 reacting with the input impedance begins to dominate the noise
performance. For these applications, using the OPA111 or dual OPA2111
FET input op amp will provide lower noise performance. For lower cost use
the OPA121 plastic. To construct an electrometer use the OPA128.
10Ω
–15V
FIGURE 2. Offset Adjustment.
INA105BM
–In
V2
2
R1
25kΩ
R2
5
3
A1, A2
R1
(Ω)
R2
(Ω)
OPA27A
OPA111B
OPA128LM
50.5
202
202
2.5k
10k
10k
GAIN CMRR
(V/V)
(dB)
100
100
100
128
110
118
MAX
IB
NOISE AT 1kHz
(nV/√HZ)
40nA
1pA
75fA
4
10
38
25kΩ
6
+In
V3
A2
+In
1
VO = V3 – V3
Offset Adjustment
Range = ±300µV
V1
R3
R4
25kΩ
25kΩ
FIGURE 4. Precision Instrumentation Amplifier.
V0
1
INA105
2
V0 = V3 – V2
Gain Error = 0.005%
CMR = 100dB
Nonlinearity = 0.0002%
5
100Ω
1%
6
V–
V0
0 to 2V
100Ω
1%
3
FIGURE 3. Precision Difference Amplifier.
1
IIN
0 to 20mA
FIGURE 5. Current Receiver with Compliance to Rails.
®
INA105
6
INA105
INA105
2
2
V2
5
5
6
V0
6
V0
1
V1
3
V0 = V1
Gain Error = 0.001% maximum
1
3
V0 = – V2
Gain Error = 0.01% maximum
Nonlinearity = 0.001% maximum
Gain Drift = 2ppm/°C
FIGURE 9. Precision Unity-Gain Buffer.
V+
V+
3
FIGURE 6. Precision Unity-Gain Inverting Amplifier.
INA105
2
+15V
2
5
+10V Out
6
REF10
6
INA105
2
7
5
(V+)/2
–10V Out
4
6
1
1
Common
3
4
Common
FIGURE 10. Pseudoground Generator.
FIGURE 7. ±10V Precision Voltage Reference.
INA105
2
V+
2
5
REF10
6
6
+5V Out
2
V1
INA105
4
V3
5
–5V Out
V0
3
V0 = (V1 + V3)/2, ±0.01% maximum
6
1
1
FIGURE 11. Precision Average Value Amplifier.
3
FIGURE 8. ±5V Precision Voltage Reference.
®
7
INA105
INA105
INA105
2
0 to +10V Output
±2ppm/°C
5
2
5
6
1
V0
Output
6
(1)
1
V1
–10V
to
+10V
Input
3
Device
VFC320
VFC100
DAC80
DAC703
XTR110
3
V 0 = 2 • V1
Gain Error = 0.01% maximum
Gain Drift = 2ppm/°C
2
FIGURE 12. Precision (G = 2) Amplifier.
Output
0-10kHz
0-FCLOCK/2
0-FS (12 bits)
0-FS (16 bits)
4-20mA
6
REF10
10V
INA105
4
NOTE: (1) Unipolar Input Device.
2
5
FIGURE 15. Precision Bipolar Offsetting.
6
V1
V3
1
V0
R1
3
R2
2
5
INA105
V0 = V1 + V3, ±0.01% maximum
FIGURE 13. Precision Summing Amplifier.
6
V1
V3
INA105
2
1
V0
3
(
V0 = 1 +
R2
R1
)( V
1 + V3
2
)
For G=10,
See INA106.
5
FIGURE 16. Precision Summing Amplifier with Gain.
6
V3
3
V0
= 1/2 V3
±20V
1
V0 = V3/2, ±0.01%
FIGURE 14. Precision Gain = 1/2 Amplifier.
®
INA105
8
Offset
Adjust
6
7
8
Noise (60Hz hum)
INA101AG
3
A1
4
Transducer or
Analog Signal
10kΩ
5
20kΩ
10kΩ
A3
RG
1
10
20kΩ
Output
10kΩ
11
A2
10kΩ
12
Noise (60Hz hum)
100kΩ
Shield
2
+VCC
13
–VCC
9
14 Common
3
INA105
2
5
6
1
FIGURE 17. Instrumentation Amplifier Guard Drive Generator.
INA105
2
5
INA105
2
6
V1
V2
5
3
6
1
3
V3
V0 = V3 + V4 – V1 – V2
V4
V0
1
FIGURE 18. Precision Summing Instrumentation Amplifier.
®
9
INA105
INA105
INA105
5
2
V2
R
2
5
6
R
V1
6
V1
1
3
1
3
IO = (V1 – V2) (1/25k + 1/R)
For R ≅ 200 Ω, Figure 24 will
provide superior performance.
Load
V01
IO
V2
FIGURE 19. Precision Voltage-to-Current Converter with
Differential Inputs.
INA105
2
5
INA105
V2
6
V02
5
2
1
3
6
R
V3
V01 – V02 = 2 (V2 – V1)
3
1
FIGURE 22. Differential Output Difference Amplifier.
IO = (V3 – V2)/R
IO
Load
V2
2
INA105
FIGURE 20. Differential Input Voltage-to-Current Converter
for Low IOUT.
5
6
R ≥ 200 Ω
R
V3
INA105
V2
2
1
3
Gate can be
+VCC –5V
5
IO = (V3 – V2)/R
R
Load
6
IO
R < 200Ω
R
V3
Gate can be
+VS –5V
1
3
IO = (V3 – V2) (1/25k + 1/R)
Load
FIGURE 23. Isolating Current Source with Buffering Amplifier for Greater Accuracy.
IO
FIGURE 21. Isolating Current Source.
®
INA105
10
Window Center–Window Span
2
5
Window Span
0 to +5V
6
1
3
INA105
2
Window
Center
±10V
4115
3
9
Window
Comparator
7
2
VIN
5
10
5
Lower Limit
Upper Limit
HI
GO
LO
8
6
3
INA105
1
Window Center + Window Span
FIGURE 24. Window Comparator with Window Span and Window Center Inputs.
–In
V1
INA105
(1)
V+
R2
2
5
R1
R
6
R2
3
1kΩ
R
1
+In
(1)
V2
Load
IO
IO = (E2 – E1) (1 +2R2/R1) (1/25k + 1/R)
NOTE: (1) See Figure 5 for op amp recommendation.
FIGURE 25. Precision Voltage-Controlled Current Source with Buffered Differential Inputs and Gain.
INA105
2
5
V1
DG188
6
VO
3
1
Logic
In
1
Logic In
VO
0
–V1
1
+V1
FIGURE 26. Digitally Controlled Gain of ±1 Amplifier.
®
11
INA105
INA105
R2
V1
2
R2
A1
5
R1
49.5Ω
6
R1
V0 = 200 (V2 – V1)
1
A3
R1
49.5Ω
3
R2
R2
A2
V2
Conventional
Instrumentation
Amplifier (e.g., INA101 or INA102)
A = 100
INA105
A=2
FIGURE 27. Boosting Instrumentation Amplifier Common-Mode Range From ±5 to ±7.5V with 10V Full-Scale Output.
INA105
R1
2
D1
5
10pF
D2
OPA111
6
R3
3
V1
Input
R2
V0 = |V1|
R4
1
R5
2kΩ
FIGURE 28. Precision Absolute Value Buffer.
0 to 10V
In
12.5kΩ
1kΩ
50kΩ
INA105
OPA27
+15V
2
5
2
50.1Ω
6
REF10
6
10V
50.1Ω
1
3
4
RLOAD
4 to 20mA
Out
FIGURE 29. Precision 4-20mA Current Transmitter.
®
INA105
12
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