Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - In-amp, Op-amp InAmp SOIC 16

FEATURES

● LOW OFFSET VOLTAGE: 50µV max

● LOW DRIFT: 0.5µV/°C 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 / IA

● 16-PIN PLASTIC DIP, SOL-16

DESCRIPTION

The INA2128 is a dual, low power, general purpose instrumen-

tation amplifier offering excellent accuracy. Its versatile

3-op amp design and small size make it 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.

Internal input protection can withstand up to ±40V without

damage.

The INA2128 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 per IA—ideal for

battery-operated and multiple-channel systems.

The INA2128 is available in SOL-16 packages, specified

for the –40°C to +85°C temperature range.

APPLICATIONS

● SENSOR AMPLIFIER

THERMOCOUPLE, RTD, BRIDGE

● MEDICAL INSTRUMENTATION

● MULTIPLE-CHANNEL SYSTEMS

● BATTERY OPERATED EQUIPMENT

Dual, Low Power

INSTRUMENTATION AMPLIFIER

40kΩ40kΩ

INA

V+

V–

INA2128

Ref

= 1 +

50kΩ

–

Over-Voltage

Protection

25kΩ

Over-Voltage

Protection

40kΩ40kΩ

INB

Ref

= 1 +

50kΩ

–

Over-Voltage

Protection

25kΩ

Over-Voltage

Protection

INA2128

SBOS035A – DECEMBER 1995 – REVISED APRIL 2007

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.

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.

All trademarks are the property of their respective owners.

Summary of content (17 pages)

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INA2128 INA 212 8 INA 212 8 SBOS035A – DECEMBER 1995 – REVISED APRIL 2007 Dual, Low Power INSTRUMENTATION AMPLIFIER DESCRIPTION FEATURES ● ● ● ● ● ● ● ● LOW OFFSET VOLTAGE: 50µV max LOW DRIFT: 0.5µV/°C 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 / IA 16-PIN PLASTIC DIP, SOL-16 The INA2128 is a dual, low power, general purpose instrumentation amplifier offering excellent accuracy.
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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 .....................................................
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ELECTRICAL CHARACTERISTICS At TA = +25°C, VS = ±15V, RL = 10kΩ, unless otherwise noted. INA2128U PARAMETER CONDITIONS INPUT Offset Voltage, RTI Initial TA = +25°C vs Temperature TA = TMIN to TMAX vs Power Supply VS = ±2.25V to ±18V Long-Term Stability Impedance, Differential Common-Mode VO = 0V Common-Mode Voltage Range(1) Safe Input Voltage Common-Mode Rejection VCM = ±13V, ∆RS = 1kΩ G=1 G=10 G=100 G=1000 TYP MAX ±50 ±500/G ±0.5 ± 20/G ±1 ±100/G (V+) – 2 (V–) + 2 ±10 ±100/G ±0.2 ± 2/G ±0.
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TYPICAL CHARACTERISTICS At TA = +25°C, VS = ±15V, unless otherwise noted.
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TYPICAL CHARACTERISTICS (Continued) At TA = +25°C, VS = ±15V, unless otherwise noted. CROSSTALK vs FREQUENCY 120 G = 10V/V Crosstalk (dB) 100 G = 1V/V G = 1000V/V 80 G = 100V/V 60 40 20 0 G = 1V/V 100 10 G = 10V/V 10 1 G = 100, 1000V/V Current Noise 1 10 100 1k 100k 10k 1M 0.1 1 10 1k 10k Frequency (Hz) SETTLING TIME vs GAIN QUIESCENT CURRENT and SLEW RATE vs TEMPERATURE Quiescent Current (µA) 0.01% 0.1% 10 1.7 6 1.6 5 1.5 4 Slew Rate 1.4 3 IQ 1.3 2 1.
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TYPICAL CHARACTERISTICS (Continued) At TA = +25°C, VS = ±15V, unless otherwise noted. OUTPUT VOLTAGE SWING vs OUTPUT CURRENT INPUT BIAS CURRENT vs TEMPERATURE (V+) 2 IB 1 Output Voltage (V) Input Bias Current (nA) (V+)–0.4 IOS 0 Typical IB and IOS Range ±2nA at 25°C –1 (V+)–0.8 (V+)–1.2 (V–)+1.2 (V–)+0.8 (V–)+0.4 –2 V– –50 –25 0 25 50 75 100 0 125 14 +25°C +85°C (V+)–0.8 –40°C RL = 10kΩ (V–)+1.
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TYPICAL CHARACTERISTICS (Continued) At TA = +25°C, VS = ±15V, unless otherwise noted. SMALL-SIGNAL STEP RESPONSE (G = 1, 10) SMALL-SIGNAL STEP RESPONSE (G = 100, 1000) G=1 G = 100 20mV/div 20mV/div G = 10 G = 1000 5µs/div 20µs/div LARGE-SIGNAL STEP RESPONSE (G = 1, 10) LARGE-SIGNAL STEP RESPONSE (G = 100, 1000) G=1 G = 100 5V/div 5V/div G = 10 G = 1000 5µs/div 5µs/div VOLTAGE NOISE 0.1Hz to 10Hz INPUT-REFERRED, G ≥ 100 0.1µV/div 1s/div INA2128 SBOS035A www.ti.
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APPLICATION INFORMATION Figure 1 shows the basic connections required for operation of the INA2128. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins as shown. The output is referred to the output reference (Ref) terminals (RefA and RefB) which are normally grounded. These must be low-impedance connections to assure good commonmode rejection.
PAGE 9
OFFSET TRIMMING The INA2128 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. Microphone, Hydrophone etc.
PAGE 10
INPUT PROTECTION The inputs of the INA2128 are individually protected for voltages up to ±40V. For example, a condition of –40V on one input and +40V on the other input will not cause damage. Internal circuitry on each input provides low series impedance under normal signal conditions. To provide equivalent protection, series input resistors would contribute excessive noise. If the input is overloaded, the protection circuitry limits the input current to a safe value of approximately 1.5mA to 5mA.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com (4) 11-Jul-2013 There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.
PAGE 13
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 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 INA2128U/1K SOIC DW 16 1000 330.0 16.4 10.75 10.7 2.7 12.0 16.0 Q1 INA2128UA/1K SOIC DW 16 1000 330.0 16.4 10.75 10.7 2.7 12.0 16.
PAGE 14
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA2128U/1K SOIC DW 16 1000 367.0 367.0 38.0 INA2128UA/1K SOIC DW 16 1000 367.0 367.0 38.
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