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INA115

Precision

INSTRUMENTATION AMPLIFIER

25kΩ25kΩ

V+

V–

INA115

Ref

G = 1 +

50kΩ

–

Over-Voltage

Protection

25kΩ

Over-Voltage

Protection

Feedback

FEATURES

● LOW OFFSET VOLTAGE: 50µV max

● 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:

±2.25 TO ±18V

● LOW QUIESCENT CURRENT: 3mA max

● SOL-16 SURFACE-MOUNT PACKAGE

APPLICATIONS

● SWITCHED-GAIN AMPLIFIER

● BRIDGE AMPLIFIER

● THERMOCOUPLE AMPLIFIER

● RTD SENSOR AMPLIFIER

● MEDICAL INSTRUMENTATION

● DATA ACQUISITION

DESCRIPTION

The INA115 is a low cost, general purpose instrumen-

tation amplifier offering excellent accuracy. Its versa-

tile three-op amp design and small size make it ideal

for a wide range of applications. Similar to the model

INA114, the INA115 provides additional connections

to the input op amps, A

and A

, which improve gain

accuracy in high gains and are useful in forming

switched-gain amplifiers.

A single external resistor sets any gain from 1 to

10,000. Internal input protection can withstand up to

±40V without damage.

The INA115 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. Quies-

cent current is 3mA maximum.

The INA115 is available in the SOL-16 surface-mount

package, specified for the –40°C to +85°C tempera-

ture range.

INA115

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

SBOS021

Summary of content (16 pages)

PAGE 1
® INA115 INA 115 Precision INSTRUMENTATION AMPLIFIER FEATURES DESCRIPTION ● LOW OFFSET VOLTAGE: 50µV max The INA115 is a low cost, general purpose instrumentation amplifier offering excellent accuracy. Its versatile three-op amp design and small size make it ideal for a wide range of applications. Similar to the model INA114, the INA115 provides additional connections to the input op amps, A1 and A2, which improve gain accuracy in high gains and are useful in forming switched-gain amplifiers.
PAGE 2
SPECIFICATIONS ELECTRICAL At TA = +25°C, VS = ±15V, RL = 2kΩ unless otherwise noted. INA115BU 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 U Package VO1 1 16 NC Gain Sense1 2 15 Gain Sense2 RG 3 14 RG – IN 4 13 V+ V + IN 5 12 Feedback NC 6 11 VO V– 7 10 Ref VO2 8 9 V 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.
PAGE 4
TYPICAL PERFORMANCE CURVES At TA = +25°C, VS = ±15V, unless otherwise noted. GAIN vs FREQUENCY COMMON-MODE REJECTION vs FREQUENCY 140 Common-Mode Rejection (dB) G = 100, 1k Gain (V/V) 1k 100 10 1 VO1 connected to Gain Sense1 and VO2 connected to Gain Sense2 . See text.
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 10 35 60 85 QUIESCENT CURRENT vs TEMPERATURE QUIESCENT CURRENT AND POWER DISSIPATION vs POWER SUPPLY VOLTAGE Quiescent Current (mA) Quiescent Current (mA) –|ICL| Temperature (°C) 2.4 2.2 2.0 2.6 120 2.5 100 80 2.4 Power Dissipation 60 2.3 Quiescent Current 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 VO1 connected to Gain Sense1 and VO2 connected to Gain Sense2 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 Commonly used gains and resistor values are shown in Figure 1. Figure 1 shows the basic connections required for operation of the INA115. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins as shown. For G=1, no resistor is required, but connect pins 2-3 and connect pins 14-15. Gain peaking in G=1 can be reduced by shorting the internal 25kΩ feedback resistors (see typical performance curve Gain vs Frequency).
PAGE 9
SWITCHED GAIN Figure 2 shows a circuit for digital selection of four gains. Multiplexer “on” resistance does not significantly affect gain. The resistor values required for some commonly used gain steps are shown. This circuit uses the internal 25kΩ feedback resistors, so the resistor values shown cannot be scaled to a different impedance level. OFFSET TRIMMING The INA115 is laser trimmed for very low offset voltage and drift. Most applications require no external offset adjustment.
PAGE 10
– VIN +15V 9 13 14 R1 1 12 INA115 R2 4 R3 2 11 2 Enable 10 1 13 Over-Voltage Protection Feedback A1 25kΩ NC 25kΩ 25kΩ 3 R4 A0 A3 7 16 A1 NC R5 6 3 4 VO 11 14 25kΩ 15 15 5 12 R6 5 A2 Over-Voltage Protection 25kΩ R7 8 HI-509 10 25kΩ 7 8 + VIN –15V A0 A1 Gain L H L H L L H H 1 Highest GAIN STEPS R1 (Ω) R2 (Ω) R3 (Ω) R4 (Ω) R5 (Ω) R6 (Ω) R7 (Ω) 1, 1, 1, 0, 18k 18k 18k 18k 1.8k 9k 10.8k 12.74k 180 4.5k 3.6k 9.02k 40 9k 7.2k 43.7k 180 4.5k 3.
PAGE 11
INPUT COMMON-MODE RANGE The linear common-mode range of the input op amps of the INA115 is approximately ±13.75V (or 1.25V from the power supplies). As the output voltage increases, however, the linear input range will be limited by the output voltage swing of the input amplifiers, A1 and A2. The common-mode range is related to the output voltage of the complete amplifier—see performance curve “Input Common-Mode Range vs Output Voltage.” common-mode range of both input amplifiers.
PAGE 12
PACKAGE OPTION ADDENDUM www.ti.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.com 11-Jul-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
PAGE 14
PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device INA115AU/1K Package Package Pins Type Drawing SOIC DW 16 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 1000 330.0 16.4 Pack Materials-Page 1 10.75 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.7 2.7 12.0 16.
PAGE 15
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) INA115AU/1K SOIC DW 16 1000 367.0 367.0 38.
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