Datasheet

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

FEATURES

D LOW OFFSET VOLTAGE: 50µV max

D LOW DRIFT: 0.5µV/5C max

D LOW INPUT BIAS CURRENT: 5nA max

D HIGH CMR: 120dB min

D INPUTS PROTECTED TO +40V

D WIDE SUPPLY RANGE: +2.25V to +18V

D LOW QUIESCENT CURRENT: 700µA

D 8-PIN PLASTIC DIP, SO-8

APPLICATIONS

D BRIDGE AMPLIFIER

D THERMOCOUPLE AMPLIFIER

D RTD SENSOR AMPLIFIER

D MEDICAL INSTRUMENTATION

D DATA ACQUISITION

DESCRIPTION

The INA128 and INA129 are low power, general

purpose instrumentation amplifiers offering excellent

accuracy. The versatile 3-op amp design and small size

make them ideal for a wide range of applications.

Current-feedback input circuitry provides wide

bandwidth even at high gain (200kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000.

The INA128 provides an industry-standard gain

equation; the INA129 gain equation is compatible with

the AD620.

The INA128/INA129 is laser trimmed for very low offset

voltage (50µV), drift (0.5µV/°C) and high

common-mode rejection (120dB at G ≥ 100). It

operates with power supplies as low as ±2.25V, and

quiescent current is only 700µA—ideal for battery-

operated systems. Internal input protection can

withstand up to ±40V without damage.

The INA128/INA129 is available in 8-pin plastic DIP and

SO-8 surface-mount packages, specified for the –40°C

to +85°C temperature range. The INA128 is also

available in a dual configuration, the INA2128.

40k

Ω

40k

Ω

40k

Ω

40k

Ω

V+

−

Ref

G=1+

49.4k

Ω

−

NOTE: (1) INA129: 24.7k

Ω

G=1+

50k

Ω

INA128, INA129

Over-Voltage

Protection

Over-Voltage

Protection

25kΩ

(1)

25kΩ

(1)

INA128:

INA129:

All trademarks are the property of their respective owners.

INA128

INA129

Precision, Low Power

INSTRUMENTATION AMPLIFIERS

SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005

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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.

Summary of content (20 pages)

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INA128 INA129 SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 Precision, Low Power INSTRUMENTATION AMPLIFIERS FEATURES D D D D D D D D DESCRIPTION LOW OFFSET VOLTAGE: 50µV max LOW DRIFT: 0.5µV/5C max LOW INPUT BIAS CURRENT: 5nA max HIGH CMR: 120dB min INPUTS PROTECTED TO +40V WIDE SUPPLY RANGE: +2.25V to +18V LOW QUIESCENT CURRENT: 700µA 8-PIN PLASTIC DIP, SO-8 The INA128 and INA129 are low power, general purpose instrumentation amplifiers offering excellent accuracy.
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"#$ "#% www.ti.com SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 ELECTROSTATIC DISCHARGE SENSITIVITY ABSOLUTE MAXIMUM RATINGS(1) Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18V Analog Input Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . ±40V Output Short-Circuit (to ground) . . . . . . . . . . . . . . . . . . Continuous Operating Temperature . . . . . . . . . . . . . . . . . . . −40°C to +125°C Storage Temperature Range . . . . .
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"#$ "#% www.ti.com SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 ELECTRICAL CHARACTERISTICS At TA = +25°C, VS = ±15V, RL = 10kΩ, unless otherwise noted. INA128P, U INA129P. U PARAMETER CONDITIONS MIN INA128PA, UA INA129PA, UA TYP MAX TA = +25°C ±10±100/G TA = TMIN to TMAX VS = ±2.25V to ±18V ±0.2±2/G ±0.2±20/G MIN TYP MAX UNIT ±50±500/G ±25±100/G ±125±1000/G µV ±0.5±20/G ±0.
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"#$ "#% www.ti.com SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 ELECTRICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15V, RL = 10kΩ, unless otherwise noted. INA128P, U INA129P. U PARAMETER CONDITIONS MIN TYP Voltage: Positive RL = 10kΩ (V+) − 1.4 Voltage: Negative RL = 10kΩ (V−) + 1.4 INA128PA, UA INA129PA, UA MAX MIN TYP MAX UNIT (V+) − 0.9 ∗ ∗ (V−) + 0.
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"#$ "#% www.ti.com SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 TYPICAL CHARACTERISTICS At TA = +25°C, VS = ±15V, unless otherwise noted.
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"#$ "#% www.ti.com SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15V, unless otherwise noted. SETTLING TIME vs GAIN 100 100 10 G = 10V/V 10 1 G = 100, 1000V/V Current Noise 1 0.01% Settling Time (m s) G = 1V/V 100 Input Bias Current Noise (pA/√Hz) Input-Referred Voltage Noise (nV/√Hz) INPUT−REFERRED NOISE vs FREQUENCY 1k 1 0.1 1 10 100 1k 0.
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"#$ "#% www.ti.com SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15V, unless otherwise noted. OUTPUT VOLTAGE SWING vs POWER SUPPLY VOLTAGE (V+) (V+)−0.4 Output Voltage Swing (V) (V+) (V+)−0.4 (V+)−0.8 (V+)−1.2 (V−)+1.2 (V−)+0.8 (V−)+0.4 +85°C +25°C (V+)−0.8 (V+)−1.2 −40°C RL = 10kΩ +25°C (V−)+1.2 −40°C +85°C (V−)+0.8 +85°C −40°C (V−)+0.
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"#$ "#% www.ti.com SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15V, unless otherwise noted. SMALL SIGNAL (G = 1, 10) SMALL SIGNAL (G = 100, 1000) G=1 G = 100 20mV/div 20mV/div G = 10 G = 1000 20µs/div 5µs/div LARGE SIGNAL (G = 100, 1000) LARGE SIGNAL (G = 1, 10) G=1 G = 100 5V/div 5V/div G = 10 G = 1000 5µs/div 20µs/div VOLTAGE NOISE 0.1 to 10Hz INPUT−REFERRED, G ≥ 100 0.
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"#$ "#% www.ti.com SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 APPLICATIONS INFORMATION Figure 1 shows the basic connections required for operation of the INA128/INA129. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins as shown. resistors are laser trimmed to accurate absolute values.
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"#$ "#% www.ti.com SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 OFFSET TRIMMING The INA128/INA129 is laser trimmed for low offset voltage and offset voltage drift. Most applications require no external offset adjustment. Figure 2 shows an optional circuit for trimming the output offset voltage. The voltage applied to Ref terminal is summed with the output. The op amp buffer provides low impedance at the Ref terminal to preserve good common-mode rejection.
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"#$ "#% www.ti.com SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 Operation at very low supply voltage requires careful attention to assure that the input voltages remain within their linear range. Voltage swing requirements of internal nodes limit the input common-mode range with low power supply voltage. Typical performance curves, “Input Common-Mode Range vs Output Voltage” show the range of linear operation for ±15V, ±5V, and ±2.5V supplies. V+ 10.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 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) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.
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PACKAGE MATERIALS INFORMATION www.ti.com 9-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant INA128U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 INA128UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 INA129U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 9-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA128U/2K5 SOIC D 8 2500 367.0 367.0 35.0 INA128UA/2K5 SOIC D 8 2500 367.0 367.0 35.0 INA129U/2K5 SOIC D 8 2500 367.0 367.0 35.0 INA129UA/2K5 SOIC D 8 2500 367.0 367.0 35.
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