TEXAS INSTRUMENTS INA105 Technical data

®

Precision Unity Gain

DIFFERENTIAL AMPLIFIER

INA105

FEATURES

● CMR 86dB min OVER TEMPERATURE

● GAIN ERROR: 0.01% max

● NONLINEARITY: 0.001% max

● NO EXTERNAL ADJUSTMENTS

REQUIRED

● EASY TO USE

● COMPLETE SOLUTION

● HIGHLY VERSATILE

● LOW COST

● PLASTIC DIP, TO-99 HERMETIC METAL,

AND SO-8 SOIC PACKAGES

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.

APPLICATIONS

● DIFFERENTIAL AMPLIFIER

● INSTRUMENTATION AMPLIFIER

BUILDING BLOCK

● UNITY-GAIN INVERTING AMPLIFIER

● GAIN-OF-1/2 AMPLIFIER

● NONINVERTING GAIN-OF-2 AMPLIFIER

● AVERAGE VALUE AMPLIFIER

● ABSOLUTE VALUE AMPLIFIER

● SUMMING AMPLIFIER

● SYNCHRONOUS DEMODULATOR

● CURRENT RECEIVER WITH COMPLIANCE

TO RAILS

● 4mA TO 20mA TRANSMITTER

● VOLTAGE-CONTROLLED CURRENT

SOURCE

● ALL-PASS FILTERS

–In

+In

2

25kΩ 25kΩ

3

25kΩ25kΩ

5

Sense

7

V+

6

Output

4

V–

1

Ref

SBOS145

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

©

1985 Burr-Brown Corporation PDS-617G Printed in U.S.A. August, 1993

SPECIFICATIONS

ELECTRICAL

At +25°C, VCC = ±15V, unless otherwise noted.

INA105AM INA105BM INA105KP, KU

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS

GAIN

(1)

Initial
Error 0.005 0.01 ✻✻ 0.01 0.025 %

vs Temperature 1 5 ✻✻ ✻✻ppm/°C

Nonlinearity

(2)

OUTPUT

Rated Voltage I
Rated Current V
Impedance 0.01 ✻✻Ω

= +20mA, –5mA 10 12 ✻✻ ✻✻ V

O

= 10V +20, –5 ✻✻ mA

O

Current Limit To Common +40/–10 ✻✻mA
Capacitive Load Stable Operation 1000 ✻✻pF

INPUT

Impedance

Voltage Range

Common-Mode Rejection
OFFSET VOLTAGE RTO

(3)

(4)

(5)

Differential 50 ✻✻kΩ

Common-Mode 50 ✻✻kΩ

Differential ±10 ✻✻ V

Common-Mode ±20 ✻✻ V

TA = T

MIN

to T

(6), (7)

MAX

80 90 86 100 72 ✻ dB

Initial 50 250 ✻✻ ✻500 µV

vs Temperature 5 20 5 10 ✻✻µV/°C
vs Supply ±V
vs Time 20 ✻✻µV/mo

OUTPUT NOISE VOLTAGE RTO

= 6V to 18V 1 25 ✻ 15 ✻✻µV/V

S

(6), (8)

fB = 0.01Hz to 10Hz 2.4 ✻✻µVp-p
f

= 10kHz 60 ✻✻nV/√Hz

O

DYNAMIC RESPONSE

Small Signal Bandwidth –3dB 1 ✻✻MHz
Full Power Bandwidth V
Slew Rate 2 3 ✻✻ ✻✻ V/µs
Settling Time: 0.1% V

0.01% V

0.01% V

= 20Vp-p 30 50 ✻✻ ✻✻ kHz

O

= 10V Step 4 ✻✻µs

O

= 10V Step 5 ✻✻µs

O

= 10V Step, V

CM

= 0V 1.5 ✻✻µs

DIFF

POWER SUPPLY

Rated ±15 ✻✻V
Voltage Range Derated Performance ±5 ±18 ✻✻✻ ✻V
Quiescent Current V

= 0V ±1.5 ±2 ✻✻ ✻✻ mA

O

TEMPERATURE RANGE

Specification –40 +85 ✻✻✻✻°C
Operation –55 +125 ✻✻–40 +85 °C
Storage –65 +150 ✻✻–40 +125 °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 peak-

to-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 I
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

to 1mA. (5) With zero source impedance (see “Maintaining CMR” section). (6) Referred to output in unity-gain difference configuration. Note that this

IN

of amplifier’s input current noise and thermal noise contribution of resistor network.

1 ✻✻V/V

0.0002 0.001 ✻✻ ✻✻ %

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

y

Top View TO-99

Ref

–In

Case internall

Tab

1

3

+In

connected to V–. Make no connection.

8

4

V–

No Internal
Connection

7

5

Sense

V+

62

Output

INA105AM
INA105BM

ABSOLUTE MAXIMUM RATINGS

Supply ................................................................................................±18V

Input Voltage Range ............................................................................ ±V

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

S

PACKAGE/ORDERING INFORMATION

PACKAGE
DRAWING TEMPERATURE

PRODUCT PACKAGE NUMBER

INA105AM TO-99 Metal 001 –40°C to +85°C
INA105BM TO-99 Metal 001 –40°C to +85°C
INA105KP 8-Pin Plastic DIP 006 –40°C to +85°C
INA105KU 8-Pin SOIC 182 –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.

(1)

RANGE

Top View DIP/SOIC

1

Ref

–In

+In

V–

NOTE: (1) Performance grade identifier box for small outline surface mount.
Blank indicates K grade. Part is marked INA105U.

(1)

2

3

4

No Internal Connection

8

V+

7

Output

6

Sense

5

ELECTROSTATIC
DISCHARGE SENSITIVITY

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.

®

3

INA105

TYPICAL PERFORMANCE CURVES

At TA = 25°C, VS = ±15V, unless otherwise noted.

STEP RESPONSE

–10 to +10

Output Voltage (V)

+50

0

–50

Output Voltage (mV)

SMALL SIGNAL RESPONSE

(No Load)

0 4 8 12 16

(R

+50

0

–50

Output Voltage (mV)

17.5

15

12.5

10

(V)

OUT

7.5

V

5

2.5

0

0

Time (µs)

SMALL SIGNAL RESPONSE

Ω

LOAD

= , C

∞

= 1000pF)

LOAD

0510

Time (µs)

MAXIMUM V

(Positive Swing)

OUT

vs I

OUT

VS = ±18V

VS = ±15V

VS = ±12V

VS = ±5V

6 1218243036

I

(mA)

OUT

–17.5

–15

–12.5

–10

(V)

OUT

–7.5

V

–5

–2.5

110

100

90

CMR (dB)

80

70

60

0510

Time (µs)

MAXIMUM V

(Negative Swing)

OUT

vs I

OUT

VS = ±18V

VS = ±15V

VS = ±12V

VS = ±5V

0

–2 –4 –6 –8 –10 –12

0

–I

(mA)

OUT

CMR vs FREQUENCY

BM

AM, KP, U

10

100 1k 10k 100k

Frequency (Hz)

®

INA105

4

TYPICAL PERFORMANCE CURVES (CONT)

V

3

5

6

3

INA105

V

OUT

= V3 – V

2

2

R

3

R

1

R

2

R

4

V

2

25k

Ω

25k

Ω

25k

Ω

25k

Ω

1µF

V–

4

1µF

V+

7

1

At TA = 25°C, VS = ±15V, unless otherwise noted.

140

120

100

80

PSRR (dB)

60

40

1

POWER SUPPLY REJECTION

vs FREQUENCY

V–

V+

10 100 1k 10k 100k

Frequency (Hz)

36

30

24

18

12

Input Range (V)

6

0

±3

COMMON-MODE INPUT RANGE vs SUPPLY

(Difference Amplifier Connected, V

Negative CMV

Positive CMV

±6 ±9 ±12 ±15 ±18 ±21

Supply Voltage (V)

OUT

= 0)

APPLICATION INFORMATION

Figure 1 shows the basic connections required for operation
of the INA105. Power supply bypass capacitors should be
connected close to the device pins.

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

FIGURE 1. Basic Power Supply and Signal Connections.

5

INA105

®

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.

nominal resistor values are equal. These resistors are laser
trimmed for precise resistor ratios to achieve accurate gain

Do not interchange pins 1 and 3 or pins 2 and 5, even though

and highest CMR. Interchanging these pins would not pro­vide specified performance.

R

V

2

10

Ω

V

3

= V3 – V

V

O

Offset Adjustment

3

2

3

1

R

3

1

Range = ±300µV

FIGURE 2. Offset Adjustment.

INA105

R

4

10

V

1

–In

A

R

2

5

6

V

O

1

R

R

1

R

2

2

2

3

A

+15V

499k

Ω

100k

Ω

Ω

–15V

V

+In

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

2

1

VO = (1 + 2R2/R1) (V2 –V1)

INA105

5

6

V

0

0utput

1

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.

INA105BM

–In

V

2

+In

V

3

R

2

3

1

25k

Ω

R

3

25k

Ω

V

= V3 – V

0

Gain Error = 0.005%

2

R

25k

R

25k

2

Ω

4

Ω

CMR = 100dB
Nonlinearity = 0.0002%

FIGURE 3. Precision Difference Amplifier.

R

A

, A

1

2

1R2

(Ω)(Ω) (V/V) (dB) I

GAIN CMRR MAX NOISE AT 1kHz

(nV/√HZ)

B

OPA27A 50.5 2.5k 100 128 40nA 4

5

6

V

0

1

OPA111B 202 10k 100 110 1pA 10
OPA128LM 202 10k 100 118 75fA 38

FIGURE 4. Precision Instrumentation Amplifier.

INA105

2

100

Ω

1%

V–

100

Ω

I

IN

0 to 20mA

1%

3

5

6

V

0

0 to 2V

1

FIGURE 5. Current Receiver with Compliance to Rails.

®

INA105

6

5

6

2

(V+)/2

INA105

V+

1

7

4

V+

CommonCommon

3

INA105

V

1

5

6

1

3

2

V

0

INA105

V

0

= V

1

Gain Error = 0.001% maximum

2

V

2

13

= – V

V

0

Gain Error = 0.01% maximum

5

6

V

0

2

Nonlinearity = 0.001% maximum
Gain Drift = 2ppm/°C

FIGURE 6. Precision Unity-Gain Inverting Amplifier.

+15V

2

+10V Out

–10V Out

5

6

REF10

4

6

2

1

INA105

FIGURE 9. Precision Unity-Gain Buffer.

FIGURE 7. ±10V Precision Voltage Reference.

13

FIGURE 8. ±5V Precision Voltage Reference.

3

2

INA105

5

6

V+

REF10

FIGURE 10. Pseudoground Generator.

INA105

2

6

+5V Out

4

–5V Out

1

V

1

V

3

3

V

= (V1 + V3)/2, ±0.01% maximum

0

2

5

6

V

0

FIGURE 11. Precision Average Value Amplifier.

®

7

INA105

INA105

V

1

6

1

3

V

0

INA105

V

3

25

R

1

R

2

V

0

= 1 +

R

2

R

1

V1 + V

3

2

( )( )

For G=10,

See INA106.

2

1

V

1

3

5

6

V

0

1

–10V

to

+10V

INA105

0 to +10V Output

±2ppm/°C

2

5

6

Output

(1)

Input

= 2 • V

V

0

1

Gain Error = 0.01% maximum
Gain Drift = 2ppm/°C

FIGURE 12. Precision (G = 2) Amplifier.

INA105

2

1

V

1

V

3

3

= V1 + V3, ±0.01% maximum

V

0

FIGURE 13. Precision Summing Amplifier.

3

2

6

Device
VFC320
VFC100
DAC80
DAC703
XTR110

Output
0-10kHz

/2

0-F

CLOCK

0-FS (12 bits)
0-FS (16 bits)
4-20mA

REF10

10V

4

5

NOTE: (1) Unipolar Input Device.

FIGURE 15. Precision Bipolar Offsetting.

6

V

0

INA105

2

5

FIGURE 16. Precision Summing Amplifier with Gain.

6

V

3

V

3

±20V

1

V0 = V3/2, ±0.01%

FIGURE 14. Precision Gain = 1/2 Amplifier.

®

INA105

= 1/2 V

0

3

8

Transducer or
Analog Signal

Noise (60Hz hum)

Offset

Adjust

8

76

INA101AG

3

A

20k

20k

1

10k

Ω

Ω

Ω

10k

10k

Ω

A

3

Output

1

Ω

4

5

R

G

10

11

A

12

2

10k

Ω

Noise (60Hz hum)

Shield

100k

INA105

2

5

6

FIGURE 17. Instrumentation Amplifier Guard Drive Generator.

INA105

2

3

V

1

5

6

Ω

2

+V

13

–V

CC

9 14 Common

CC

3

1

INA105

2

5

V

2

1

V

= V3 + V4 – V1 – V

0

2

FIGURE 18. Precision Summing Instrumentation Amplifier.

3

V

3

V

4

1

9

6

V

0

INA105

®

INA105

2

V

2

5

R

2

INA105

5

6

R

3

V

1

IO = (V1 – V2) (1/25k + 1/R)

≅

For R 200 , Figure 24 will
provide superior performance.

Ω

1

Load

I

O

FIGURE 19. Precision Voltage-to-Current Converter with

Differential Inputs.

INA105

2

V

2

3

V

3

5

6

R

1

V

1

3

V

2

6

1

INA105

2

5

6

3

– V

= 2 (V2 – V1)

V

01

02

1

FIGURE 22. Differential Output Difference Amplifier.

V

01

V

02

= (V3 – V2)/R

I

O

Load

I

O

FIGURE 20. Differential Input Voltage-to-Current Converter

for Low I

2

V

2

3

V

3

I

= (V3 – V2) (1/25k + 1/R)

O

OUT

INA105

.

5

R

6

1

Load I

R

R < 200Ω

Gate can be

–5V

+V

S

O

FIGURE 21. Isolating Current Source.

2

V

2

INA105

5

6

R 200

Ω≥

R

V

3

3

I

= (V3 – V2)/R

O

1

Gate can be

–5V

+V

CC

Load I

O

FIGURE 23. Isolating Current Source with Buffering Ampli-

fier for Greater Accuracy.

®

INA105

10

Window Span

0 to +5V

Window Center–Window Span

2

5

6

3

INA105

1

Lower Limit

2

5

Window

Center

±10V

3

1

INA105

6

FIGURE 24. Window Comparator with Window Span and Window Center Inputs.

–In

V

1

+In

V

2

(1)

R

2

R

1

R

2

(1)

I

= (E2 – E1) (1 +2R2/R1) (1/25k + 1/R)

O

NOTE: (1) See Figure 5 for op amp recommendation.

2

3

INA105

V

IN

Upper Limit

5

6

1kΩ

1

5

4115

3

Window

Comparator

2

10

9

7

8

Window Center + Window Span

V+

R

R

Load

I

O

HI

GO

LO

FIGURE 25. Precision Voltage-Controlled Current Source with Buffered Differential Inputs and Gain.

INA105

V

1

DG188

2

5

V

O

6

3

1

V

O

0

–V

1

+V

Logic

In

1

Logic In

FIGURE 26. Digitally Controlled Gain of ±1 Amplifier.

11

INA105

1
1

®

INA105

V

1

A

1

R

1

49.5Ω

R

1

R

1

49.5Ω

R

2

R

2

A

3

1

2

5

6

V0 = 200 (V2 – V1)

3

R

A

2

V

2

2

R

2

Conventional

Instrumentation

Amplifier (e.g., INA101 or INA102)

INA105

A = 2

A = 100

FIGURE 27. Boosting Instrumentation Amplifier Common-Mode Range From ±5 to ±7.5V with 10V Full-Scale Output.

INA105

V

Input

R

2

D

1

10pF

3

D

1

OPA111

2

1

R

5

2k

Ω

1

R

3

R

4

R

2

5

6

V0 = |V1|

FIGURE 28. Precision Absolute Value Buffer.

12.5k

0 to 10V

Ω

In

50k

Ω

+15V

OPA27

2

REF10

6
10V

4

FIGURE 29. Precision 4-20mA Current Transmitter.

®

INA105

1k

Ω

2

INA105

5

50.1

Ω

6

50.1

Ω

3

4 to 20mA

1

R

LOAD

Out

12

PACKAGE OPTION ADDENDUM

www.ti.com

22-Oct-2007

PACKAGING INFORMATION

Orderable Device Status

(1)

Package

Type

Package

Drawing

Pins Package

Qty

Eco Plan

INA105AM NRND TO-99 LMC 8 20 Green (RoHS &

no Sb/Br)

INA105BM NRND TO-99 LMC 8 20 Green (RoHS &

no Sb/Br)

INA105KP ACTIVE PDIP P 8 50 Green(RoHS &

no Sb/Br)

INA105KPG4 ACTIVE PDIP P 8 50 Green(RoHS &

no Sb/Br)

INA105KU ACTIVE SOIC D 8 100 Green (RoHS &

no Sb/Br)

INA105KU/2K5 ACTIVE SOIC D 8 2500 Green (RoHS &

no Sb/Br)

INA105KU/2K5E4 ACTIVE SOIC D 8 2500 Green (RoHS &

no Sb/Br)

INA105KUE4 ACTIVE SOIC D 8 100 Green (RoHS &

no Sb/Br)

(1)

The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.

(2)

Lead/Ball Finish MSL Peak Temp

AU N / A for Pkg Type

AU N / A for Pkg Type

CU NIPDAU N / A for Pkg Type

CU NIPDAU N / A for Pkg Type

CU NIPDAU Level-3-260C-168 HR

CU NIPDAU Level-3-260C-168 HR

CU NIPDAU Level-3-260C-168 HR

CU NIPDAU Level-3-260C-168 HR

(3)

(2)

Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
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Addendum-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

TAPE AND REEL INFORMATION

11-Mar-2008

*All dimensions are nominal

Device Package

INA105KU/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1

Type

Package

Drawing

Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

A0 (mm) B0 (mm) K0 (mm) P1

(mm)W(mm)

Pin1

Quadrant

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

11-Mar-2008

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

INA105KU/2K5 SOIC D 8 2500 346.0 346.0 29.0

Pack Materials-Page 2

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