Datasheet

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INA337

INA338

SBOS248 – JUNE 2002

www.ti.com

DESCRIPTION

The INA337 and INA338 (with shutdown) are high tempera-

ture, high-performance, low-cost, precision instrumentation

amplifiers. They are true single-supply instrumentation ampli-

fiers with very-low DC errors and input common-mode ranges

that extends beyond the positive and approaches the nega-

tive rail. These features make them suitable for applications

ranging from general-purpose to high-accuracy.

Excellent long-term stability and very low 1/f noise assure

low offset voltage and drift throughout the life of the product.

The INA337 (without shutdown) comes in the MSOP-8 pack-

age. The INA338 (with shutdown) is offered in MSOP-10.

Both are specified over the temperature range, –40°C to

+125°C.

FEATURES

● PRECISION

LOW OFFSET: 100µV (max)

LOW OFFSET DRIFT: 0.4µV/°C (max)

EXCELLENT LONG-TERM STABILITY

VERY-LOW 1/f NOISE

● SMALL SIZE

micro

PACKAGE: MSOP-8, MSOP-10

● LOW COST

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Wide-Temperature, Precision

INSTRUMENTATION AMPLIFIER

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

APPLICATIONS

● LOW-LEVEL TRANSDUCER AMPLIFIER FOR

BRIDGES, LOAD CELLS, THERMOCOUPLES

● WIDE DYNAMIC RANGE SENSOR

MEASUREMENTS

● HIGH-RESOLUTION TEST SYSTEMS

● WEIGH SCALES

● MULTI-CHANNEL DATA ACQUISITION

SYSTEMS

● MEDICAL INSTRUMENTATION

● AUTOMOTIVE APPLICATIONS

● GENERAL-PURPOSE

INA337 AND INA338 RELATED PRODUCTS

PRODUCT FEATURES

INA326 Precision, Rail-to-Rail I/O, 2.4mA I

INA114 50µV V

, 0.5nA I

, 115dB CMR, 3mA I

, 0.25µV/°C drift

INA118 50µV V

, 1nA I

, 120dB CMR, 385µA I

, 0.5µV/°C drift

INA122 250µV V

, –10nA I

, 85µA I

, Rail-to-Rail Output, 3µV/°C drift

INA128 50µV V

, 2nA I

, 125dB CMR, 750µA I

, 0.5µV/°C drift

INA321 500µV V

, 0.5pA I

, 94dB CMRR, 60µA I

, Rail-to-Rail Output

INA337R

IN–

IN+

V+

V–

G = 2(R

)

Summary of content (19 pages)

PAGE 1
INA INA 337 INA337 INA338 338 SBOS248 – JUNE 2002 Wide-Temperature, Precision INSTRUMENTATION AMPLIFIER FEATURES DESCRIPTION ● PRECISION LOW OFFSET: 100µV (max) LOW OFFSET DRIFT: 0.4µV/°C (max) EXCELLENT LONG-TERM STABILITY VERY-LOW 1/f NOISE The INA337 and INA338 (with shutdown) are high temperature, high-performance, low-cost, precision instrumentation amplifiers.
PAGE 2
PACKAGE/ORDERING INFORMATION PRODUCT PACKAGE-LEAD PACKAGE DESIGNATOR(1) SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER TRANSPORT MEDIA, QUANTITY MSOP-8 DGK –40°C to +125°C BIM " " " " INA337AIDGKT INA337AIDGKR Tape and Reel, 250 Tape and Reel, 2500 MSOP-10 DGS –40°C to +125°C BIL " " " " INA338AIDGST INA338AIDGSR Tape and Reel, 250 Tape and Reel, 2500 INA337 " INA338 " NOTE: (1) For the most current specifications and package information, refer to our web site at
PAGE 3
ELECTRICAL CHARACTERISTICS: VS = +2.7V to +5.5V BOLDFACE limits apply over the specified temperature range, TA = –40°C to +125°C At TA = +25°C, RL = 10kΩ, G = 100 (R1 = 2kΩ, R2 = 100kΩ), external gain set resistors, and IACOMMON = VS /2, with external equivalent filter corner of 1kHz filters, unless otherwise noted. INA337AIDGK, INA338AIDGS PARAMETER CONDITION INPUT VS = +5V, VCM = VS /2 Offset Voltage, RTI VOS Over Temperature vs Temperature dVOS/dT vs Power Supply PSR VS = +2.7V to +5.
PAGE 4
ELECTRICAL CHARACTERISTICS: VS = +2.7V to +5.5V (Cont.) BOLDFACE limits apply over the specified temperature range, TA = –40°C to +125°C At TA = +25°C, RL = 10kΩ, G = 100 (R1 = 2kΩ, R2 = 100kΩ), external gain set resistors, and IACOMMON = VS /2, with external equivalent filter corner of 1kHz filters, unless otherwise noted. INA337AIDGK, INA338AIDGS PARAMETER POWER SUPPLY Specified Voltage Range Quiescent Current Over Temperature CONDITION TYP MAX UNITS 2.4 +5.5 3.4 3.7 V mA mA 0.
PAGE 5
TYPICAL CHARACTERISTICS At TA = 25°C, VS = +5V, Gain = 100, RL = 10kΩ with external equivalent filter corner of 1kHz filters, unless otherwise noted.
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TYPICAL CHARACTERISTICS (Cont.) At TA = 25°C, VS = +5V, Gain = 100, RL = 10kΩ with external equivalent filter corner of 1kHz filters, unless otherwise noted. INPUT OFFSET VOLTAGE vs WARM-UP TIME 10kHz FILTER, G = 100 INPUT OFFSET VOLTAGE vs TURN-ON TIME 1kHz FILTER, G = 100 Input Offset Voltage (20µV/div) Input Offset Voltage (20µV/div) Filter Settling Time Device Turn-On Time (75µs) 0 1 Turn-On Time (ms) Device Turn-On Time Filter Settling Time 0 2 SMALL-SIGNAL RESPONSE G = 1, 10, AND 100 0.
PAGE 7
TYPICAL CHARACTERISTICS (Cont.) At TA = 25°C, VS = +5V, Gain = 100, RL = 10kΩ with external equivalent filter corner of 1kHz filters, unless otherwise noted.
PAGE 8
TYPICAL CHARACTERISTICS (Cont.) At TA = 25°C, VS = +5V, Gain = 100, RL = 10kΩ with external equivalent filter corner of 1kHz filters, unless otherwise noted. VOUT (dBV) Population 100 100 110 31.6 120 1 130 0.316 140 0.10 150 0.03 160 0.01 170 0.003 –200 –180 –160 –140 –120 –100 –80 –60 –40 –20 0 20 40 60 80 100 120 140 160 180 200 180 0 200k 400k 600k Frequency (Hz) Gain Error (m%) QUIESCENT CURRENT vs TEMPERATURE INPUT BIAS CURRENT vs TEMPERATURE 3.0 2.0 VS = +5V 1.5 2.5 1.
PAGE 9
APPLICATIONS INFORMATION SETTING THE GAIN The INA337 is a 2-stage amplifier with each stage gain set by R1 and R2, respectively (see Figure 4, “Inside the INA337", for details.) Overall gain is described by the equation: Figure 1 shows the basic connections required for operation of the INA337. A 0.1µF capacitor, placed close to and across the power-supply pins is strongly recommended for highest accuracy. RoCo is an output filter that minimizes auto-correction circuitry noise.
PAGE 10
Following this design procedure for R1 produces the maximum possible input stage gain for best accuracy and lowest noise. Circuit layout and supply bypassing can affect performance. Minimize the stray capacitance on pins 1 and 8. Use recommended supply bypassing, including a capacitor directly from pin 7 to pin 4 (V+ to V–), even with dual (split) power supplies (see Figure 1).
PAGE 11
INPUT AND OUTPUT VOLTAGE INPUT PROTECTION The INA337 and INA338 feature nearly rail-to-rail input behavior, with the linear input voltage range extending from 0.25V above the negative rail to 0.1V above the positive rail. The output is able to swing to within 0.25V of the negative rail and 0.075V of the positive rail. See Typical Characteristics Curve “Output Swing to the Negative Rail” for additional detail. The inputs of the INA337 are protected with internal diodes connected to the power-supply rails.
PAGE 12
FILTERING Filtering can be adjusted through selection of R2C2 and ROCO for the desired tradeoff of noise and bandwidth. Adjustment of these components will result in more or less ripple due to auto-correction circuitry noise and will also affect broadband noise. Filtering limits slew rate, settling time, and output overload recovery time. R0 R1 5 VREF = 10V to 5V C0 R´2 It is generally desirable to keep the resistance of RO relatively low to avoid DC gain error created by the subsequent stage loading.
PAGE 13
PACKAGE DRAWINGS MPDS028B – JUNE 1997 – REVISED SEPTEMBER 2001 DGK (R-PDSO-G8) PLASTIC SMALL-OUTLINE PACKAGE 0,38 0,25 0,65 8 0,08 M 5 0,15 NOM 3,05 2,95 4,98 4,78 Gage Plane 0,25 1 0°– 6° 4 3,05 2,95 0,69 0,41 Seating Plane 1,07 MAX 0,15 0,05 0,10 4073329/C 08/01 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion. Falls within JEDEC MO-187 INA337, INA338 SBOS222A www.ti.
PAGE 14
PACKAGE DRAWINGS (Cont.) MPDS035A – JANUARY 1998 – REVISED SEPTEMBER 2001 DGS (S-PDSO-G10) PLASTIC SMALL-OUTLINE PACKAGE 0,27 0,17 0,50 10 0,08 M 6 0,15 NOM 3,05 2,95 4,98 4,78 Gage Plane 0,25 1 0°– 6° 5 3,05 2,95 0,69 0,41 Seating Plane 1,07 MAX 0,15 0,05 0,10 4073272/B 08/01 NOTES: A. B. C. A. 14 All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion.
PAGE 15
PACKAGE OPTION ADDENDUM www.ti.
PAGE 16
PACKAGE OPTION ADDENDUM www.ti.com 19-Nov-2012 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 19-Nov-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing INA337AIDGKR VSSOP DGK INA337AIDGKT VSSOP INA338AIDGST VSSOP SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 DGK 8 250 180.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 DGS 10 250 180.0 12.4 5.3 3.4 1.4 8.0 12.
PAGE 18
PACKAGE MATERIALS INFORMATION www.ti.com 19-Nov-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA337AIDGKR VSSOP DGK 8 2500 367.0 367.0 35.0 INA337AIDGKT VSSOP DGK 8 250 210.0 185.0 35.0 INA338AIDGST VSSOP DGS 10 250 210.0 185.0 35.
PAGE 19
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.