Datasheet

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INA118

60kΩ60kΩ

V+

V–

INA118

Ref

G = 1 +

50kΩ

–

Over-Voltage

Protection

25kΩ

Over-Voltage

Protection

FEATURES

● LOW OFFSET VOLTAGE: 50µV max

● LOW DRIFT: 0.5µV/°C max

● LOW INPUT BIAS CURRENT: 5nA max

● HIGH CMR: 110dB min

● INPUTS PROTECTED TO ±40V

● WIDE SUPPLY RANGE: ±1.35 to ±18V

● LOW QUIESCENT CURRENT: 350µA

● 8-PIN PLASTIC DIP, SO-8

DESCRIPTION

The INA118 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 (70kHz 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 INA118 is laser trimmed for very low offset voltage

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

jection (110dB at G = 1000). It operates with power

supplies as low as ±1.35V, and quiescent current is only

350µA—ideal for battery operated systems.

The INA118 is available in 8-pin plastic DIP,

and SO-8 surface-mount packages, specified for

the –40°C to +85°C temperature range.

Precision, Low Power

INSTRUMENTATION AMPLIFIER

INA118

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

INA118

SBOS027

Summary of content (16 pages)

PAGE 1
® INA118 INA 118 INA 118 Precision, 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: 110dB min INPUTS PROTECTED TO ±40V WIDE SUPPLY RANGE: ±1.35 to ±18V LOW QUIESCENT CURRENT: 350µA 8-PIN PLASTIC DIP, SO-8 The INA118 is a low power, general purpose instrumentation amplifier offering excellent accuracy.
PAGE 2
SPECIFICATIONS ELECTRICAL At TA = +25°C, VS = ±15V, RL = 10kΩ unless otherwise noted. INA118PB, UB PARAMETER CONDITIONS INPUT Offset Voltage, RTI Initial vs Temperature vs Power Supply Long-Term Stability Impedance, Differential Common-Mode Linear Input Voltage Range MIN TYP MAX ±50 ± 500/G ±0.5 ± 20/G ±5 ± 100/G (V+) – 1 (V–) + 1.1 ±10 ± 50/G ±0.2 ± 2/G ±1 ±10/G ±0.4 ±5/G 1010 || 1 1010 || 4 (V+) – 0.65 (V–) + 0.95 TA = +25°C TA = TMIN to TMAX VS = ±1.
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 RG 1 8 RG V–IN 2 7 V+ V+IN 3 6 VO V– 4 5 Ref ESD damage can range from subtle performance degradation to complete device failure.
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TYPICAL PERFORMANCE CURVES At TA = +25°C, VS = ±15V, unless otherwise noted.
PAGE 5
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V, unless otherwise noted.
PAGE 6
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V, unless otherwise noted. INPUT BIAS AND OFFSET CURRENT vs TEMPERATURE OFFSET VOLTAGE vs WARM-UP TIME 10 Input Bias and Offset Current (nA) 5 Offset Voltage Change (µV) 8 6 4 G = 1000 2 0 –2 –4 –6 –8 –10 1.5 1.0 0.5 0 ±Ib 1 0 –1 –2 –3 –4 –75 –50 –25 0 25 50 75 Temperature (°C) OUTPUT VOLTAGE SWING vs OUTPUT CURRENT OUTPUT VOLTAGE SWING vs POWER SUPPLY VOLTAGE Output Voltage Swing (V) (V+) –0.4 VS ≤ ±5V Positive (V+) –0.
PAGE 7
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V, unless otherwise noted. INPUT-REFERRED NOISE, 0.1Hz to 10Hz THD + N vs FREQUENCY 1 THD + N (%) G = 10 0.1 0k RL =1 Ω 0.1µV/div 0.01 (Noise Floor) RL = ∞ 0.
PAGE 8
APPLICATION INFORMATION Figure 1 shows the basic connections required for operation of the INA118. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins as shown. The stability and temperature drift of the external gain setting resistor, RG, also affects gain. RG’s contribution to gain accuracy and drift can be directly inferred from the gain equation (1). Low resistor values required for high gain can make wiring resistance important.
PAGE 9
NOISE PERFORMANCE The INA118 provides very low noise in most applications. For differential source impedances less than 1kΩ, the INA103 may provide lower noise. For source impedances greater than 50kΩ, the INA111 FET-Input Instrumentation Amplifier may provide lower noise. Low frequency noise of the INA118 is approximately 0.28µVp-p measured from 0.1 to 10Hz (G≥100). This provides dramatically improved noise when compared to stateof-the-art chopper-stabilized amplifiers. Microphone, Hydrophone etc.
PAGE 10
SINGLE SUPPLY OPERATION The INA118 can be used on single power supplies of +2.7V to +36V. Figure 5 shows a basic single supply circuit. The output Ref terminal is connected to ground. Zero differential input voltage will demand an output voltage of 0V (ground). Actual output voltage swing is limited to approximately 35mV above ground, when the load is referred to ground as shown. The typical performance curve “Output Voltage vs Output Current” shows how the output voltage swing varies with output current.
PAGE 11
V+ +3V 3V 10.0V 6 REF102 2V – ∆V R1 RG 300Ω VO INA118 2 R2 4 Ref 2V + ∆V Pt100 Cu 150Ω R1 (1) K Cu RG VO INA118 Ref R3 100Ω = RTD at 0°C NOTE: (1) R1 required to create proper common-mode voltage, only for low voltage operation — see text. ISA TYPE FIGURE 5. Single-Supply Bridge Amplifier. – VIN + RG R1, R2 E + Chromel – Constantan 58.5 66.5kΩ J + Iron – Constantan 50.2 76.8kΩ K + Chromel – Alumel 39.4 97.6kΩ T + Copper – Constantan 38.
PAGE 12
PACKAGE OPTION ADDENDUM www.ti.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.com 16-Apr-2009 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
PAGE 14
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 INA118U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 INA118UB/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
PAGE 15
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) INA118U/2K5 SOIC D 8 2500 346.0 346.0 29.0 INA118UB/2K5 SOIC D 8 2500 346.0 346.0 29.
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