Datasheet

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INA331

INA2331

SBOS215C – DECEMBER 2001 – REVISED APRIL 2005

DESCRIPTION

The INA331 and INA2331 are rail-to-rail output, low-power

CMOS instrumentation amplifiers that offer wide range, single-

supply operation as well as bipolar-supply operation. The

INA331 family provides low-cost, low-noise amplification of

differential signals with a low quiescent current of 415µA

(dropping to 0.01µA when shutdown). Returning to normal

operation within microseconds, this INA can be used for

battery or multi-channel applications.

Configured internally in a gain of 5V/V, the INA331 offers

flexibility in higher gains by choosing external resistors.

FEATURES

● DESIGNED FOR LOW COST

● HIGH GAIN ACCURACY: G = 5, 0.02%, 2ppm/°C

● GAIN SET WITH EXT. RESISTORS FOR > 5V/V

● LOW OFFSET VOLTAGE: ±250µV

● HIGH CMRR: 94dB DC, 50dB at 45kHz

● LOW BIAS CURRENT: 0.5pA

● BANDWIDTH, SLEW RATE: 2.0MHz, 5V/µs

● RAIL-TO-RAIL OUTPUT SWING: (V+) – 0.02V

● WIDE TEMPERATURE RANGE: –55°C to +125°C

● LOW QUIESCENT CURRENT: 490µA max/chan

● SHUT DOWN: 0.01µA

● MSOP-8 SINGLE AND TSSOP-14 DUAL PACKAGES

Low-Power, Single-Supply, CMOS

INSTRUMENTATION AMPLIFIERS

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

● INDUSTRIAL SENSOR AMPLIFIERS:

Bridge, RTD, Thermocouple, Position

● PHYSIOLOGICAL AMPLIFIERS:

ECG, EEG, EMG

● A/D CONVERTER SIGNAL CONDITIONING

● DIFFERENTIAL LINE RECEIVERS WITH GAIN

● FIELD UTILITY METERS

● PCMCIA CARDS

● AUDIO AMPLIFIERS

● COMMUNICATION SYSTEMS

● TEST EQUIPMENT

● AUTOMOTIVE INSTRUMENTATION

The INA331 rejects line noise and its harmonics, because

common-mode error remains low even at higher frequencies.

High bandwidth and slew rate makes the INA331 ideal for

directly driving sampling Analog-to-Digital (A/D) converters

as well as general-purpose applications.

With high precision, low cost, and small packages, the

INA331 outperforms discrete designs. They are specified for

a wide temperature range of –55°C to +125°C.

40kΩ

REF

–

10kΩ

ShutdownV+

OUT

G = 5 + (5R

)

V–

40kΩ

Ch A

INA2331

INA331

Ch B

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.

www.ti.com

All trademarks are the property of their respective owners.

Summary of content (21 pages)

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INA3 31 INA 233 1 INA331 INA2331 ® SBOS215C – DECEMBER 2001 – REVISED APRIL 2005 Low-Power, Single-Supply, CMOS INSTRUMENTATION AMPLIFIERS FEATURES APPLICATIONS ● ● ● ● ● ● ● ● ● ● ● ● ● INDUSTRIAL SENSOR AMPLIFIERS: Bridge, RTD, Thermocouple, Position ● PHYSIOLOGICAL AMPLIFIERS: ECG, EEG, EMG ● A/D CONVERTER SIGNAL CONDITIONING ● DIFFERENTIAL LINE RECEIVERS WITH GAIN ● FIELD UTILITY METERS ● PCMCIA CARDS ● AUDIO AMPLIFIERS ● COMMUNICATION SYSTEMS ● TEST EQUIPMENT ● AUTOMOTIVE INSTRUMENTATION DESIG
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ELECTROSTATIC DISCHARGE SENSITIVITY ABSOLUTE MAXIMUM RATINGS(1) Supply Voltage, V+ to V– .................................................................... 7.5V Signal Input Terminals, Voltage(2) ..................... (V–) – 0.5V to (V+) + 0.5V Current(2) ..................................................... 10mA Output Short-Circuit(3) .............................................................. Continuous Operating Temperature ..................................................
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ELECTRICAL CHARACTERISTICS: VS = +2.7V to +5.5V Boldface limits apply over the specified temperature range, TA = –55°C to 125°C. At TA = +25°C, RL = 10kΩ, G = 25, and VREF = VS /2, unless otherwise noted.
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TYPICAL CHARACTERISTICS At TA = +25°C, VS = 5V, VCM = VS /2, RL = 10kΩ, and CL = 100pF, unless otherwise noted.
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TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = 5V, VCM = VS /2, RL = 10kΩ, and CL = 100pF, unless otherwise noted.
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TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = 5V, VCM = VS /2, RL = 10kΩ, and CL = 100pF, unless otherwise noted.
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TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = 5V, VCM = VS /2, RL = 10kΩ, and CL = 100pF, unless otherwise noted. PERCENT OVERSHOOT vs LOAD CAPACITANCE SETTLING TIME vs GAIN 100 60 Output 2VPP Differential Input Drive Output 100mVPP Differential Drive 90 80 40 Overshoot (%) Settling Time (µs) 50 0.01% 30 20 G=5 70 60 50 40 G = 25 30 10 20 0.
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TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = 5V, VCM = VS /2, RL = 10kΩ, and CL = 100pF, unless otherwise noted. SLEW RATE vs TEMPERATURE INPUT BIAS CURRENT vs TEMPERATURE 8 10000 Input Bias Current (pA) 7 Slew Rate (V/µs) 6 5 4 3 2 1000 100 10 1 1 0 0.
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APPLICATIONS INFORMATION The INA331 is a modified version of the classic “two op amp” instrumentation amplifier, with an additional gain amplifier. Figure 1 shows the basic connections for the operation of the INA331 and INA2331. The power supply should be capacitively decoupled with 0.1µF capacitors as close to the INA331 as possible for noisy or high-impedance applications. The output is referred to the reference terminal, which must be at least 1.2V below the positive supply rail.
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SETTING THE GAIN The ratio of R2 to R1, or the impedance between pins 1, 5, and 6, determines the gain of the INA331. With an internally set gain of 5, the INA331 can be programmed for gains greater than 5 according to the following equation: G = 5 + 5 (R2/R1) The INA331 is designed to provide accurate gain, with gain error less than 0.1%. Setting gain with matching TC resistors will minimize gain drift. Errors from external resistors will add directly to the error, and may become dominant error sources.
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SHUTDOWN MODE +5V The shutdown pin of the INA331 is nominally connected to V+. When the pin is pulled below 0.8V on a 5V supply, the INA331 goes into sleep mode within nanoseconds. For actual shutdown threshold, see the typical characteristic Shutdown Voltage vs Supply Voltage. Drawing less than 2µA of current, and returning from sleep mode in microseconds, the shutdown feature is useful for portable applications.
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OFFSET VOLTAGE ERROR CALCULATION FEEDBACK CAPACITOR IMPROVES RESPONSE The offset voltage (VOS) of the INA331IDGK is specified at a maximum of 500µV with a +5V power supply and the common-mode voltage at VS/2. Additional specifications for powersupply rejection and common-mode rejection are provided to allow the user to easily calculate worst-case expected offset under the conditions of a given application.
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APPLICATION CIRCUITS Filtering can be modified to suit application needs by changing the capacitor value of the output filter. MEDICAL ECG APPLICATIONS Figure 9 shows the INA331 configured to serve as a low-cost ECG amplifier, suitable for moderate accuracy heart-rate applications such as fitness equipment. The input signals are obtained from the left and right arms of the patient. The common-mode voltage is set by two 2MΩ resistors. This potential through a buffer provides an optional right leg drive.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 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.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device INA2331AIPWR Package Package Pins Type Drawing TSSOP PW 14 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 2500 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1 INA2331AIPWT TSSOP PW 14 250 180.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1 INA331AIDGKR VSSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA2331AIPWR TSSOP PW 14 2500 367.0 367.0 35.0 INA2331AIPWT TSSOP PW 14 250 210.0 185.0 35.0 INA331AIDGKR VSSOP DGK 8 2500 367.0 367.0 35.0 INA331AIDGKT VSSOP DGK 8 250 210.0 185.0 35.0 INA331IDGKR VSSOP DGK 8 2500 367.0 367.0 35.0 INA331IDGKT VSSOP DGK 8 250 210.0 185.0 35.
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