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INA125

INSTRUMENTATION AMPLIFIER

With Precision Voltage Reference

FEATURES

● LOW QUIESCENT CURRENT: 460µA

● PRECISION VOLTAGE REFERENCE:

1.24V, 2.5V, 5V or 10V

● SLEEP MODE

● LOW OFFSET VOLTAGE: 250

µV max

● LOW OFFSET DRIFT: 2

µV/°C max

● LOW INPUT BIAS CURRENT: 20nA max

● HIGH CMR: 100dB min

● LOW NOISE: 38nV/√Hz at f = 1kHz

● INPUT PROTECTION TO

±40V

● WIDE SUPPLY RANGE

Single Supply: 2.7V to 36V

Dual Supply:

±1.35V to ±18V

● 16-PIN DIP AND SO-16 SOIC PACKAGES

APPLICATIONS

● PRESSURE AND TEMPERATURE BRIDGE

AMPLIFIERS

● INDUSTRIAL PROCESS CONTROL

● FACTORY AUTOMATION

● MULTI-CHANNEL DATA ACQUISITION

● BATTERY OPERATED SYSTEMS

● GENERAL PURPOSE INSTRUMENTATION

DESCRIPTION

The INA125 is a low power, high accuracy instrumen-

tation amplifier with a precision voltage reference. It

provides complete bridge excitation and precision dif-

ferential-input amplification on a single integrated

circuit.

A single external resistor sets any gain from 4 to

10,000. The INA125 is laser-trimmed for low offset

voltage (250µV), low offset drift (2µV/°C), and high

common-mode rejection (100dB at G = 100). It oper-

ates on single (+2.7V to +36V) or dual (±1.35V to

±18V) supplies.

The voltage reference is externally adjustable with pin-

selectable voltages of 2.5V, 5V, or 10V, allowing use

with a variety of transducers. The reference voltage is

accurate to ±0.5% (max) with ±35ppm/°C drift (max).

Sleep mode allows shutdown and duty cycle operation

to save power.

The INA125 is available in 16-pin plastic DIP and

SO-16 surface-mount packages and is specified for

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

Ref

Amp

10V

30kΩ

10kΩ

30kΩ

Bandgap

REF

Sense

INA125

REF

COM

REF

2.5

REF

Out

V+

–

SLEEP

V–

= (V

– V

) G

G = 4 + 60kΩ

–

INA125

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

SBOS060

Summary of content (18 pages)

PAGE 1
INA 125 ® INA125 INA1 25 INSTRUMENTATION AMPLIFIER With Precision Voltage Reference FEATURES APPLICATIONS ● LOW QUIESCENT CURRENT: 460µA ● PRECISION VOLTAGE REFERENCE: 1.24V, 2.
PAGE 2
SPECIFICATIONS: VS = ±15V At TA = +25°C, VS = ±15V, IA common = 0V, VREF common = 0V, and RL = 10kΩ, unless otherwise noted. INA125P, U PARAMETER CONDITIONS INPUT Offset Voltage, RTI Initial vs Temperature vs Power Supply Long-Term Stability Impedance, Differential Common-Mode Safe Input Voltage Input Voltage Range Common-Mode Rejection VS = ±1.35V to ±18V, G = 4 INA125PA, UA TYP MAX ±50 ±0.25 ±3 ±0.
PAGE 3
SPECIFICATIONS: VS = ±15V (CONT) At TA = +25°C, VS = ±15V, IA common = 0V, VREF common = 0V, and RL = 10kΩ, unless otherwise noted. INA125P, U PARAMETER CONDITIONS FREQUENCY RESPONSE Bandwidth, –3dB Slew Rate Settling Time, 0.
PAGE 4
ABSOLUTE MAXIMUM RATINGS(1) PIN CONFIGURATION Top View 16-Pin DIP, SO-16 V+ 1 16 VREF10 SLEEP 2 15 VREF5 V– 3 14 VREF2.5 VREFOUT 4 13 VREFBG IAREF 5 12 VREFCOM + VIN 6 11 Sense – VIN 7 10 VO RG 8 9 Power Supply Voltage, V+ to V– ........................................................ 36V Input Signal Voltage .......................................................................... ±40V Output Short Circuit .................................................................
PAGE 5
TYPICAL PERFORMANCE CURVES At TA = +25°C and VS = ±15V, unless otherwise noted.
PAGE 6
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C and VS = ±15V, unless otherwise noted.
PAGE 7
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C and VS = ±15V, unless otherwise noted. LARGE-SIGNAL RESPONSE SMALL-SIGNAL RESPONSE G=4 5V/div 200mV/div G=4 G = 100 G = 100 100µs/div 100µs/div INPUT BIAS CURRENT vs INPUT OVERLOAD VOLTAGE INPUT-REFERRED NOISE, 0.
PAGE 8
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C and VS = ±15V, unless otherwise noted. INPUT-REFERRED OFFSET VOLTAGE PRODUCTION DISTRIBUTION, VS = ±15V INPUT-REFERRED OFFSET VOLTAGE PRODUCTION DISTRIBUTION, VS = +5V 30 35 Typical production distribution of packaged units. 20 15 10 0.1% 5 0.02% 25 20 15 10 0.02% 0.1% 0.
PAGE 9
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C and V S = ±15V, unless otherwise noted. 0.1Hz to 10Hz REFERENCE NOISE VREF = 2.5V, CL = 100pF 1mA/div REFERENCE TRANSIENT RESPONSE VREF = 2.5V, CL = 100pF +1mA 0mA 50mV/div Reference Output 2µV/div –1mA 1µs/div 10µs/div NEGATIVE REFERENCE AC LINE REJECTION vs FREQUENCY POSITIVE REFERENCE AC LINE REJECTION vs FREQUENCY 120 VREF = 2.5V 100 VREF = 5V Negative AC Line Rejection (dB) Positive AC Line Rejection (dB) 120 80 VREF = 10V C = 0.
PAGE 10
APPLICATION INFORMATION For example, in Figure 1 VREFOUT is connected to VREF10 thus supplying 10V to the bridge. It is recommended that VREFOUT be connected to one of the reference voltage pins even when the reference is not being utilized to avoid saturating the reference amplifier. Driving the SLEEP pin LOW puts the INA125 in a shutdown mode. Figure 1 shows the basic connections required for operation of the INA125.
PAGE 11
INPUT COMMON-MODE RANGE The 60kΩ term in equation 1 comes from the internal metal film resistors which are laser trimmed to accurate absolute values. The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift specifications of the INA125. The input common-mode range of the INA125 is shown in the typical performance curves.
PAGE 12
A transition region exists when VSLEEP is between 400mV and 2.7V (with respect to VREFCOM) where the output is unpredictable. Operation in this region is not recommended. The INA125 achieves high accuracy quickly following wakeup (VSLEEP ≥ 2.7V). See the typical performance curve “Input-Referred Offset Voltage vs Sleep Turn-on Time.” If shutdown is not being used, connect the SLEEP pin to V+. amount of supply voltage headroom available to the reference.
PAGE 13
INPUT PROTECTION The inputs of the INA125 are individually protected for voltage 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 120µA to 190µA.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.
PAGE 15
PACKAGE OPTION ADDENDUM www.ti.com 16-Feb-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 16
PACKAGE MATERIALS INFORMATION www.ti.com 5-Sep-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 INA125U/2K5 SOIC D 16 2500 330.0 16.4 6.5 10.3 2.1 8.0 16.0 Q1 INA125UA/2K5 SOIC D 16 2500 330.0 16.4 6.5 10.3 2.1 8.0 16.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 5-Sep-2008 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA125U/2K5 SOIC D 16 2500 346.0 346.0 33.0 INA125UA/2K5 SOIC D 16 2500 346.0 346.0 33.
PAGE 18
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