Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - In-amp, Op-amp InAmp PDIP 8

100kΩ

25kΩ

100kΩ

INA122

–

V+

Ref

V–

200k

G = 5 +

= (V

– V

) G

–+

INA122

Single Supply,

Micro

Power

INSTRUMENTATION AMPLIFIER

FEATURES

● LOW QUIESCENT CURRENT: 60µA

● WIDE POWER SUPPLY RANGE

Single Supply: 2.2V to 36V

Dual Supply: –0.9/+1.3V to

±18V

● COMMON-MODE RANGE TO (V–)–0.1V

● RAIL-TO-RAIL OUTPUT SWING

● LOW OFFSET VOLTAGE: 250

µV max

● LOW OFFSET DRIFT: 3

µV/°C max

● LOW NOISE: 60nV/√Hz

● LOW INPUT BIAS CURRENT: 25nA max

● 8-PIN DIP AND SO-8 SURFACE-MOUNT

APPLICATIONS

● PORTABLE, BATTERY OPERATED

SYSTEMS

● INDUSTRIAL SENSOR AMPLIFIER:

Bridge, RTD, Thermocouple

● PHYSIOLOGICAL AMPLIFIER:

ECG, EEG, EMG

● MULTI-CHANNEL DATA ACQUISITION

INA122

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

DESCRIPTION

The INA122 is a precision instrumentation amplifier

for accurate, low noise differential signal acquisition.

Its two-op-amp design provides excellent performance

with very low quiescent current, and is ideal for

portable instrumentation and data acquisition systems.

The INA122 can be operated with single power sup-

plies from 2.2V to 36V and quiescent current is a mere

60µA. It can also be operated from dual supplies. By

utilizing an input level-shift network, input common-

mode range extends to 0.1V below negative rail (single

supply ground).

A single external resistor sets gain from 5V/V to

10000V/V. Laser trimming provides very low offset

voltage (250µV max), offset voltage drift (3µV/°C

max) and excellent common-mode rejection.

Package options include 8-pin plastic DIP and SO-8

surface-mount packages. Both are specified for the

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

SBOS069

Summary of content (14 pages)

PAGE 1
® INA INA122 122 INA 122 Single Supply, MicroPower INSTRUMENTATION AMPLIFIER FEATURES APPLICATIONS ● LOW QUIESCENT CURRENT: 60µA ● PORTABLE, BATTERY OPERATED SYSTEMS ● INDUSTRIAL SENSOR AMPLIFIER: Bridge, RTD, Thermocouple ● PHYSIOLOGICAL AMPLIFIER: ECG, EEG, EMG ● MULTI-CHANNEL DATA ACQUISITION ● WIDE POWER SUPPLY RANGE Single Supply: 2.2V to 36V Dual Supply: –0.9/+1.3V to ±18V ● COMMON-MODE RANGE TO (V–)–0.
PAGE 2
SPECIFICATIONS At TA = +25°C, VS = +5V, RL = 20kΩ connected to VS/2, unless otherwise noted. INA122P, U PARAMETER CONDITIONS INPUT Offset Voltage, RTI vs Temperature vs Power Supply (PSRR) Input Impedance Safe Input Voltage MIN VS = +2.2V to +36V RS = 0 RS = 10kΩ Common-Mode Voltage Range Common-Mode Rejection VCM = 0V to 3.4V (V–)–0.
PAGE 3
ELECTROSTATIC DISCHARGE SENSITIVITY PIN CONFIGURATION Top View 8-Pin DIP, SO-8 RG 1 8 RG V– IN 2 7 V+ + VIN 3 6 VO V– 4 5 Ref 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 and VS = ±5V, unless otherwise noted.
PAGE 5
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C and VS = ±5V, unless otherwise noted. VOLTAGE and CURRENT NOISE DENSITY vs FREQUENCY (RTI) SETTLING TIME vs GAIN 10 Settling Time (ms) Current Noise (fA/√Hz) 100 VN 10V Step 1 0.01% 0.1% IN 0.1 10 1 10 100 1k 1 10k 10 100 INPUT-REFERRED OFFSET VOLTAGE WARM-UP QUIESCENT CURRENT vs TEMPERATURE 10 80 6 Quiescent Current (µA) Turn-on time ≤ 1ms. Settling time to final value depends on Gain—see settling time.
PAGE 6
TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C and VS = ±5V, unless otherwise noted. SMALL-SIGNAL STEP RESPONSE G=5 100mV/div 100mV/div SMALL-SIGNAL STEP RESPONSE G = 100 100µs/div LARGE-SIGNAL STEP RESPONSE G=5 INPUT-REFERRED NOISE VOLTAGE 0.
PAGE 7
APPLICATION INFORMATION offset adjustment. Figure 2 shows an optional circuit for trimming the output offset voltage. The voltage applied to the Ref terminal is added to the output signal. An op amp buffer is used to provide low impedance at the Ref terminal to preserve good common-mode rejection. Figure 1 shows the basic connections required for operation of the INA122. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins.
PAGE 8
INPUT PROTECTION The inputs of the INA122 are protected with internal diodes connected to the power supply rails (Figure 4). These diodes will clamp the applied signal to prevent it from damaging the input circuitry. If the input signal voltage can exceed the power supplies by more than 0.3V, the input signal current should be limited to less than 5mA to protect the internal clamp diodes. This can generally be done with a series input resistor.
PAGE 9
equal to 0V. The outputs of both A1 and A2 must be 0V. But any small positive voltage applied to VIN+ requires that A2’s output must swing below 0V, which is clearly impossible without a negative power supply. Operation at very low supply voltage requires careful attention to ensure that the common-mode voltage remains within its linear range. To achieve common-mode range that extends to singlesupply ground, the INA122 uses precision level-shifting buffers on its inputs.
PAGE 10
PACKAGE OPTION ADDENDUM www.ti.
PAGE 11
PACKAGE OPTION ADDENDUM www.ti.com 11-Jul-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 12
PACKAGE MATERIALS INFORMATION www.ti.com 9-Sep-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 INA122U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 INA122UA/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 9-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA122U/2K5 SOIC D 8 2500 367.0 367.0 35.0 INA122UA/2K5 SOIC D 8 2500 367.0 367.0 35.
PAGE 14
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.