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INA114

FEATURES

● LOW OFFSET VOLTAGE: 50µV max

● LOW DRIFT: 0.25

µV/°C max

● LOW INPUT BIAS CURRENT: 2nA max

● HIGH COMMON-MODE REJECTION:

115dB min

● INPUT OVER-VOLTAGE PROTECTION:

±40V

● WIDE SUPPLY RANGE:

±2.25 to ±18V

● LOW QUIESCENT CURRENT: 3mA max

● 8-PIN PLASTIC AND SOL-16

INA114

DESCRIPTION

The INA114 is a low cost, general purpose instrumen-

tation amplifier offering excellent accuracy. Its versa-

tile 3-op amp design and small size make it ideal for a

wide range of applications.

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

Internal input protection can withstand up to ±40V

without damage.

The INA114 is laser trimmed for very low offset voltage

(50µV), drift (0.25µV/°C) and high common-mode

rejection (115dB at G = 1000). It operates with power

supplies as low as ±2.25V, allowing use in battery

operated and single 5V supply systems. Quiescent cur-

rent is 3mA maximum.

The INA114 is available in 8-pin plastic and SOL-16

surface-mount packages. Both are specified for the

–40°C to +85°C temperature range.

APPLICATIONS

● BRIDGE AMPLIFIER

● THERMOCOUPLE AMPLIFIER

● RTD SENSOR AMPLIFIER

● MEDICAL INSTRUMENTATION

● DATA ACQUISITION

(12)

(11)

(10)

25kΩ25kΩ

(13)7

(7)4

(5)

(15)

(2)

(4)

V+

V–

INA114

DIP (SOIC)

Ref

DIP Connected

Internally

G = 1 +

50kΩ

–

Over-Voltage

Protection

25kΩ

Over-Voltage

Protection

Feedback

Precision

INSTRUMENTATION AMPLIFIER

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

INA114

SBOS014

Summary of content (17 pages)

PAGE 1
INA ® INA114 114 INA 114 Precision INSTRUMENTATION AMPLIFIER FEATURES DESCRIPTION ● LOW OFFSET VOLTAGE: 50µV max The INA114 is a low cost, 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. ● LOW DRIFT: 0.25µV/°C max ● LOW INPUT BIAS CURRENT: 2nA max ● HIGH COMMON-MODE REJECTION: 115dB min ● INPUT OVER-VOLTAGE PROTECTION: ±40V ● WIDE SUPPLY RANGE: ±2.
PAGE 2
SPECIFICATIONS ELECTRICAL At TA = +25°C, VS = ±15V, RL = 2kΩ, unless otherwise noted. INA114BP, BU PARAMETER CONDITIONS INPUT Offset Voltage, RTI Initial vs Temperature vs Power Supply Long-Term Stability Impedance, Differential Common-Mode Input Common-Mode Range Safe Input Voltage Common-Mode Rejection TYP MAX ±50 + 100/G ±0.25 + 5/G 3 + 10/G ±11 ±10 + 20/G ±0.1 + 0.5/G 0.5 + 2/G ±0.2 + 0.5/G 1010 || 6 1010 || 6 ±13.5 TA = +25°C TA = TMIN to TMAX VS = ±2.
PAGE 3
ELECTROSTATIC DISCHARGE SENSITIVITY PIN CONFIGURATIONS P Package 8-Pin DIP Top View RG 1 8 RG V–IN 2 7 V+ + IN 3 6 VO V– 4 5 Ref V U Package 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. ESD damage can range from subtle performance degradation to complete device failure.
PAGE 4
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. SETTLING TIME vs GAIN OFFSET VOLTAGE WARM-UP vs TIME 1000 4 Offset Voltage Change (µV) 6 Settling Time (µs) 1200 800 600 0.01% 400 0.
PAGE 6
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V, unless otherwise noted. SLEW RATE vs TEMPERATURE OUTPUT CURRENT LIMIT vs TEMPERATURE 30 Slew Rate (V/µs) 0.8 0.6 0.4 0.2 0 –75 –50 –25 0 25 50 75 100 15 –|ICL| –15 60 85 QUIESCENT CURRENT vs TEMPERATURE QUIESCENT CURRENT AND POWER DISSIPATION vs POWER SUPPLY VOLTAGE 2.4 2.2 2.0 2.6 120 2.5 100 80 2.4 Power Dissipation 60 2.3 Quiescent Current 2.2 40 2.1 20 2.
PAGE 7
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VS = ±15V, unless otherwise noted. LARGE SIGNAL RESPONSE, G = 1 SMALL SIGNAL RESPONSE, G = 1 +10V +100mV 0 0 –10V –200mV LARGE SIGNAL RESPONSE, G = 1000 SMALL SIGNAL RESPONSE, G = 1000 +10V +200mV 0 0 –10V –200mV INPUT-REFERRED NOISE, 0.1 to 10Hz 0.
PAGE 8
APPLICATION INFORMATION Figure 1 shows the basic connections required for operation of the INA114. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins as shown. ues. The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift specifications of the INA114. The stability and temperature drift of the external gain setting resistor, RG, also affects gain.
PAGE 9
OFFSET TRIMMING The INA114 is laser trimmed for very low offset voltage and 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 at the output. Low impedance must be maintained at this node to assure good common-mode rejection. This is achieved by buffering trim voltage with an op amp as shown. VO RG VIN INA114 47kΩ 47kΩ Thermocouple – VIN + Microphone, Hydrophone etc.
PAGE 10
current limit behavior. The inputs are protected even if no power supply voltage is present. The output sense connection can be used to sense the output voltage directly at the load for best accuracy. Figure 5 shows how to drive a load through series interconnection resistance. Remotely located feedback paths may cause instability. This can be generally be eliminated with a high frequency feedback path through C1.
PAGE 11
V+ Equal line resistance here creates a small common-mode voltage which is rejected by INA114. 1 V+ REF200 100µA RTD RG VO INA114 2 Ref RZ 3 VO = 0V at RRTD = RZ Resistance in this line causes a small common-mode voltage which is rejected by INA114. FIGURE 8. RTD Temperature Measurement Circuit. V+ 2 10.0V 6 REF102 R1 27k Ω 1N4148 (1) Cu R2 5.23k Ω R4 80.
PAGE 12
2.8kΩ LA RA RG/2 INA114 VO Ref 2.8kΩ G = 10 390kΩ 1/2 OPA2604 1/2 OPA2604 RL 10kΩ 390kΩ FIGURE 10. ECG Amplifier With Right-Leg Drive. – +10V VIN + RG Ref G = 500 Bridge RG 100Ω VO INA114 C1 0.1µF R1 1MΩ VO INA114 Ref OPA602 f–3dB = 1 2πR1C1 = 1.59Hz FIGURE 11. Bridge Transducer Amplifier. – VIN R1 RG FIGURE 12. AC-Coupled Instrumentation Amplifier. IO = VIN •G R INA114 + Ref IB A1 IO Load A1 IB Error OPA177 OPA602 OPA128 ±1.5nA 1pA 75fA FIGURE 13.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 (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.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined.
PAGE 15
PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-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 INA114AU/1K SOIC DW 16 1000 330.0 16.4 10.75 10.7 2.7 12.0 16.0 Q1 INA114BU/1K SOIC DW 16 1000 330.0 16.4 10.75 10.7 2.7 12.0 16.
PAGE 16
PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA114AU/1K SOIC DW 16 1000 367.0 367.0 38.0 INA114BU/1K SOIC DW 16 1000 367.0 367.0 38.
PAGE 17
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