Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - In-amp, Op-amp InAmp VSSOP 8

FEATURES

● LOW COST

● LOW QUIESCENT CURRENT:

40µA/channel

Shut Down: < 1µA

● HIGH GAIN ACCURACY:

G = 5, 0.07%, 2ppm/°C

● GAIN SET WITH EXTERNAL RESISTORS

● LOW BIAS CURRENT: 10pA

● BANDWIDTH: 500kHz, G = 5V/V

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

● WIDE TEMPERATURE RANGE:

–55

°C to +125°C

● SINGLE VERSION IN MSOP-8 PACKAGE AND

DUAL VERSION IN TSSOP-14 PACKAGE

micro

Power, Single-Supply, CMOS

INSTRUMENTATION AMPLIFIER

DESCRIPTION

The INA322 family is a series of low cost, rail-to-rail output,

micropower CMOS instrumentation amplifiers that offer wide-

range, single-supply, as well as bipolar-supply operation.

The INA322 family provides low-cost, low-noise amplification

of differential signals with micropower current consumption of

40µA. When shutdown the INA322 has a quiescent current

of less than 1µA. Returning to normal operations within

microseconds, the shutdown feature makes the INA322

optimal for low-power battery or multiplexing applications.

APPLICATIONS

● INDUSTRIAL SENSOR AMPLIFIERS:

Bridge, RTD, Thermistor, Position

● PHYSIOLOGICAL AMPLIFIERS:

ECG, EEG, EMG

● A/D CONVERTER SIGNAL CONDITIONING

● DIFFERENTIAL LINE RECEIVERS WITH GAIN

● FIELD UTILITY METERS

● PCMCIA CARDS

● COMMUNICATION SYSTEMS

● TEST EQUIPMENT

● AUTOMOTIVE INSTRUMENTATION

INA322

Configured internally for 5V/V gain, the INA322 offers excep-

tional flexibility with user-programmable external gain resis-

tors. The INA322 reduces common-mode error over fre-

quency and with CMRR remaining high up to 3kHz, line noise

and line harmonics are rejected.

The low-power design does not compromise on bandwidth or

slew rate, making the INA322 ideal for driving sampling Ana-

log-to-Digital (A/D) converters as well as general-purpose

applications. With high precision, low cost, and small packag-

ing, the INA322 outperforms discrete designs, while offering

reliability and performance.

160kΩ

REF

IN–

IN+

40kΩ 40kΩ

Shutdown V+

OUT

= (V

IN+

– V

IN–

) • Gain

Gain = 5 + 5(R2/R1)

V–

160kΩ

INA322

INA2322

SBOS174B – DECEMBER 2000 – REVISED FEBRUARY 2006

www.ti.com

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.

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.

All trademarks are the property of their respective owners.

Summary of content (21 pages)

PAGE 1
INA 322 INA322 INA2322 ® SBOS174B – DECEMBER 2000 – REVISED FEBRUARY 2006 microPower, Single-Supply, CMOS INSTRUMENTATION AMPLIFIER FEATURES APPLICATIONS ● LOW COST ● LOW QUIESCENT CURRENT: 40µA/channel Shut Down: < 1µA ● HIGH GAIN ACCURACY: G = 5, 0.07%, 2ppm/°C ● GAIN SET WITH EXTERNAL RESISTORS ● LOW BIAS CURRENT: 10pA ● BANDWIDTH: 500kHz, G = 5V/V ● RAIL-TO-RAIL OUTPUT SWING: (V+) – 0.
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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 .................................................. –65°C to +150°C Storage Temperature .............................
PAGE 3
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 = 25kΩ, G = 25, and IA common = VS /2, unless otherwise noted. INA322EA INA2322EA PARAMETER INPUT Input Offset Voltage, RTI Over Temperature vs Temperature vs Power Supply Over Temperature Long-Term Stability Input Impedance Input Common-Mode Range Common-Mode Rejection Over Temperature CONDITION VOS dVOS/dT PSRR MIN VS = +5V ±2 VS = +2.7V to +5.
PAGE 4
TYPICAL CHARACTERISTICS At TA = +25°C, VS = 5V, VCM = 1/2VS, RL = 25kΩ, CL = 50pF, unless otherwise noted.
PAGE 5
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = 5V, VCM = 1/2VS, RL = 25kΩ, CL = 50pF, unless otherwise noted.
PAGE 6
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = 5V, VCM = 1/2VS, RL = 25kΩ, CL = 50pF, unless otherwise noted.
PAGE 7
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = 5V, VCM = 1/2VS, RL = 25kΩ, CL = 50pF, unless otherwise noted. SETTLING TIME vs GAIN PERCENT OVERSHOOT vs LOAD CAPACITANCE 100 60 Output 2Vp-p Differential Input Drive Settling Time (µs) 80 Output 100mVp-p Differential Input Drive 50 70 Overshoot (%) 90 0.01% 60 50 40 30 G=5 40 30 G = 25 20 0.
PAGE 8
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = 5V, VCM = 1/2VS, RL = 25kΩ, CL = 50pF, unless otherwise noted. INPUT BIAS CURRENT vs TEMPERATURE 10k 0.8 1k Input Bias Current (pA) SR (V/µs) SLEW RATE vs TEMPERATURE 1 0.6 0.4 0.2 0 100 10 0 0.
PAGE 9
APPLICATIONS INFORMATION OPERATING VOLTAGE The INA322 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 INA322 and INA2322. The power supply should be capacitively decoupled with 0.1µF capacitors as close to the INA322 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.
PAGE 10
SETTING THE GAIN The ratio of R2 to R1, or the impedance between pins 1, 5, and 6, determines the gain of the INA322. With an internally set gain of 5, the INA322 can be programmed for gains greater than 5 according to the following equation: G = 5 + 5(R2/R1) V+ VIN+ 3 8 Microphone, Hydrophone, etc. REF 47kΩ (See Typical Characteristic Curves for Input CommonMode Range vs Reference Voltage). REFERENCE The reference terminal defines the zero output voltage level.
PAGE 11
OUTPUT BUFFERING +5V The INA322 is optimized for a load impedance of 10kΩ or greater. For higher output current the INA322 can be buffered using the OPA340, as shown in Figure 4. The OPA340 can swing within 50mV of the supply rail, driving a 600Ω load. The OPA340 is available in the tiny MSOP-8 package. 0.1µF VIN+ 3 V+ 7 5 INA322 8 REF VIN– 0.1µF Shutdown 6 VOUT 1 2 OFFSET TRIMMING VOUT OPA340 4 RG FIGURE 4. Output Buffering Circuit. Able to drive loads as low as 600Ω.
PAGE 12
OFFSET VOLTAGE ERROR CALCULATION FEEDBACK CAPACITOR IMPROVES RESPONSE The offset voltage (VOS) of the INA322EA has a specified maximum of 10mV with a +5V power supply and the common-mode voltage at VS/2. Additional specifications for power-supply 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. Power Supply Rejection Ratio (PSRR) is specified in µV/V.
PAGE 13
APPLICATION CIRCUITS drive. Filtering can be modified to suit application needs by changing the capacitor value of the output filter. Low-Power, Single-Supply Data Acquisition Systems Refer to Figure 5 to see the INA322 configured to drive an ADS7818. Functioning at frequencies of up to 500kHz, the INA322 is ideal for low-power data acquisition.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.
PAGE 15
PACKAGE OPTION ADDENDUM www.ti.com 11-Jul-2013 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 accuracy of such information. Efforts are underway to better integrate information from third parties.
PAGE 16
PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing INA2322EA/250 TSSOP PW 14 INA322EA/250 VSSOP DGK INA322EA/2K5 VSSOP DGK SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 250 180.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1 8 250 180.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA2322EA/250 TSSOP PW 14 250 210.0 185.0 35.0 INA322EA/250 VSSOP DGK 8 250 210.0 185.0 35.0 INA322EA/2K5 VSSOP DGK 8 2500 367.0 367.0 35.
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