Datasheet

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INA141

Precision, Low Power, G = 10, 100

INSTRUMENTATION AMPLIFIER

FEATURES

● LOW OFFSET VOLTAGE: 50µV max

● LOW DRIFT: 0.5

µV/°C max

● ACCURATE GAIN:

±0.05% at G = 10

● LOW INPUT BIAS CURRENT: 5nA max

● HIGH CMR: 117dB min

● INPUTS PROTECTED TO

±40V

● WIDE SUPPLY RANGE:

±2.25 to ±18V

● LOW QUIESCENT CURRENT: 750

µA

● 8-PIN PLASTIC DIP, SO-8

DESCRIPTION

The INA141 is a low power, general purpose instru-

mentation 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).

Simple pin connections set an accurate gain of 10 or

100V/V without external resistors. Internal input pro-

tection can withstand up to ±40V without damage.

The INA141 is laser trimmed for very low offset

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

mode rejection (117dB at G = 100). It operates with

power supplies as low as ±2.25V, and quiescent

current is only 750µA—ideal for battery operated

systems.

The INA141 is available in 8-pin plastic DIP, and

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

to +85°C temperature range.

INA141

40kΩ40kΩ

V+

V–

INA141

Ref

–

Over-Voltage

Protection

25kΩ

Over-Voltage

Protection

G = 10

G =100

252Ω

5050Ω

252Ω

APPLICATIONS

● BRIDGE AMPLIFIER

● THERMOCOUPLE AMPLIFIER

● RTD SENSOR AMPLIFIER

● MEDICAL INSTRUMENTATION

● DATA ACQUISITION

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

PDS-1297B

SBOS052

Summary of content (14 pages)

PAGE 1
® INA141 INA 141 INA 141 Precision, Low Power, G = 10, 100 INSTRUMENTATION AMPLIFIER FEATURES DESCRIPTION ● LOW OFFSET VOLTAGE: 50µV max ● LOW DRIFT: 0.5µV/°C max The INA141 is a low power, general purpose instrumentation 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). ● ACCURATE GAIN: ±0.
PAGE 2
SPECIFICATIONS At TA = +25°C, VS = ±15V, and RL = 10kΩ, unless otherwise noted. INA141P, U PARAMETER CONDITIONS INPUT Offset Voltage, RTI vs Temperature vs Power Supply Long-Term Stability TYP MAX ±50 ±100 ±0.5 ±2 ±1 ±10 (V+) – 2 (V–) + 2 ±20 ±50 ±0.2 ±0.5 ±0.4 ±2 0.2 0.5 1010 || 2 1010 || 9 (V+) – 1.4 (V–) + 1.7 117 100 125 106 G = 100 G = 10 G = 100 G = 10(2) VS = ±2.
PAGE 3
ELECTROSTATIC DISCHARGE SENSITIVITY PIN CONFIGURATION 8-Pin DIP and SO-8 This integrated circuit can be damaged by ESD. Burr-Brown recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. Top View J 1 8 J – IN 2 7 V+ V+IN 3 6 VO V– 4 5 Ref V ESD damage can range from subtle performance degradation to complete device failure.
PAGE 4
TYPICAL PERFORMANCE CURVES At TA = +25°C and VS = ±15V, unless otherwise noted.
PAGE 5
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C and VS = ±15V, unless otherwise noted. G = 10V/V 1 10 G = 100V/V Current Noise Quiescent Current (µA) 10 100 Input Bias Current Noise (pA/√ Hz) Input-Referred Voltage Noise (nV/√ Hz) 100 1k 0.1 1 1 10 100 1k 0.9 6 0.85 5 0.8 4 Slew Rate 0.75 3 IQ 0.7 2 0.65 10k –75 –50 –25 Frequency (Hz) INPUT OVER-VOLTAGE V/I CHARACTERISTICS 8 Input Current (mA) Flat region represents normal linear operation.
PAGE 6
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C and VS = ±15V, unless otherwise noted. SHORT-CIRCUIT OUTPUT CURRENT vs TEMPERATURE OUTPUT VOLTAGE SWING vs POWER SUPPLY VOLTAGE 18 V+ 16 Short-Circuit Current (mA) +25°C +85°C (V+)–0.8 –40°C (V+)–1.2 RL = 10kΩ (V–)+1.2 +25°C –40°C (V–)+0.8 (V–)+0.
PAGE 7
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C and VS = ±15V, unless otherwise noted. LARGE-SIGNAL STEP RESPONSE SMALL-SIGNAL STEP RESPONSE G = 10 G = 10 20mV/div 5V/div G = 100 G = 100 5µs/div 5µs/div VOLTAGE NOISE 0.1 to 10Hz INPUT-REFERRED, G = 100 0.
PAGE 8
APPLICATION INFORMATION Gains between 10 and 100 can be achieved by connecting an external resistor to the jumper pins. This is not recommended, however, because the ±25% variation of internal resistor values makes the required external resistor value uncertain. A companion model, INA128, features accurately trimmed internal resistors so that gains from 1 to 10,000 can be set with an external resistor. Figure 1 shows the basic connections required for operation of the INA141.
PAGE 9
OFFSET TRIMMING The INA141 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. INA141 47kΩ 47kΩ Thermocouple – VIN INA141 V+ INA141 V+ Microphone, Hydrophone etc.
PAGE 10
1/4 OPA4131 VO INA141 1/4 OPA4131 LA RA Ref G = 10 20kΩ 390kΩ VG 1/4 OPA4131 RL 20kΩ 1/4 OPA4131 10kΩ 390kΩ FIGURE 4. ECG Amplifier With Right-Leg Drive. +5V V+ +15V 10.0V 2.5V – ∆V REF102 R1 VO INA141 300Ω 6 2 R2 4 Ref 2.5V + ∆V Pt100 –15V Cu K Cu Ref R3 100Ω = Pt100 at 0°C – VIN + VO INA141 Ref VO INA141 FIGURE 5. Bridge Amplifier. C1 0.1µF OPA602 ISA TYPE R1 1MΩ 1 f–3dB = 2πR1C1 = 1.59Hz FIGURE 6. AC-Coupled Instrumentation Amplifier.
PAGE 11
PACKAGE OPTION ADDENDUM www.ti.
PAGE 12
PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel Diameter Width (mm) W1 (mm) A0 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant INA141U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 INA141UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
PAGE 13
PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA141U/2K5 SOIC D 8 2500 346.0 346.0 29.0 INA141UA/2K5 SOIC D 8 2500 346.0 346.0 29.
PAGE 14
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