Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp, differential amplifier Differential SOIC 8

INA146

High-Voltage, Programmable Gain

DIFFERENCE 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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

For most current data sheet and other product

information, visit www.burr-brown.com

INA146

DESCRIPTION

The INA146 is a precision difference amplifier that

can be used to accurately attenuate high differential

voltages and reject high common-mode voltages for

compatibility with common signal processing voltage

levels. High-voltage capability also affords inherent

input protection. The input common-mode range ex-

tends beyond both supply rails, making the INA146

well-suited for both single and dual supply applica-

tions.

On-chip precision resistors are laser-trimmed to achieve

accurate gain and high common-mode rejection. Ex-

cellent TCR tracking of these resistors assures contin-

ued high precision over temperature.

A 10:1 difference amplifier provides 0.1V/V gain

when the output amplifier is used as a unity-gain

buffer. In this configuration, input voltages up to

±100V can be measured. Gains greater than 0.1V/V

can be set with an external resistor pair without affect-

ing the common-mode input range.

The INA146 is available in the SO-8 surface-mount

package specified for the extended industrial tempera-

ture range, –40°C to +85°C.

FEATURES

● HIGH COMMON-MODE VOLTAGE:

+40V at V

= +5V

±100V at V

= ±15V

● DIFFERENTIAL GAIN = 0.1V/V TO 100V/V:

Set with External Resistors

● LOW QUIESCENT CURRENT: 570µA

● WIDE SUPPLY RANGE:

Single Supply: 4.5V to 36V

Dual Supplies: ±2.25V to ±18V

● LOW GAIN ERROR: 0.025%

● HIGH CMR: 80dB

● SO-8 PACKAGE

APPLICATIONS

● CURRENT SHUNT MEASUREMENTS

● SENSOR AMPLIFIER

● SYNCHRONOUS DEMODULATOR

●

CURRENT AND DIFFERENTIAL LINE

RECEIVER

● VOLTAGE-CONTROLLED CURRENT

SOURCE

● BATTERY POWERED SYSTEMS

● LOW COST AUTOMOTIVE

INSTRUMENTATION

10kΩ

(1%)

INA146

10kΩ

100kΩ

10kΩ

RefV–

V+

G = 0.1

–

418

= (V

– V

) 0.1 (1 + R

)

+–

SBOS109

Summary of content (15 pages)

PAGE 1
® INA146 INA 146 For most current data sheet and other product information, visit www.burr-brown.com High-Voltage, Programmable Gain DIFFERENCE AMPLIFIER FEATURES DESCRIPTION ● HIGH COMMON-MODE VOLTAGE: +40V at VS = +5V ±100V at VS = ±15V ● DIFFERENTIAL GAIN = 0.1V/V TO 100V/V: Set with External Resistors ● LOW QUIESCENT CURRENT: 570µA ● WIDE SUPPLY RANGE: Single Supply: 4.5V to 36V Dual Supplies: ±2.25V to ±18V ● LOW GAIN ERROR: 0.
PAGE 2
SPECIFICATIONS: VS = ±2.25V to ±18V Dual Supplies At TA = +25°C, G = 0.1, RL = 10kΩ connected to ground and ref pin connected to ground unless otherwise noted. Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
PAGE 3
SPECIFICATIONS: VS = +5V Single Supply At TA = +25°C, G = 1, RL = 10kΩ connected to VS /2 and Ref pin connected to VS /2 unless otherwise noted. Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
PAGE 4
AMPLIFIER A1, A2 PERFORMANCE At TA = +25°C, G = 0.1, RL = 10kΩ connected to ground and Ref pin, unless otherwise noted. Boldface limits apply over the specified temperature range, TA = –40°C to +85°C. INA146UA PARAMETER CONDITION OFFSET VOLTAGE, VO Input Offset Voltage vs Temperature MIN TYP MAX UNITS VOS ∆VOS /∆T RTI(1, 2) VS = ±15V, VCM = VO = 0V TA = –40°C to +85°C ±0.
PAGE 5
TYPICAL PERFORMANCE CURVES At TA = +25°C, VS = ±15V, G = 0.1, RL = 10kΩ connected to ground and Ref pin connected to ground, unless otherwise noted. GAIN vs FREQUENCY GAIN vs FREQUENCY 40 40 VS = ±15V CL = 1000pF G = 10 20 G=1 Voltage Gain (dB) Voltage Gain (dB) 20 0 –20 0 G=1 –20 G = 0.1 G = 0.
PAGE 6
TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VS = ±15V, G = 0.1, RL = 10kΩ connected to ground and Ref pin connected to ground, unless otherwise noted. QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT vs TEMPERATURE SLEW RATE vs TEMPERATURE IQ (µA) ISC 0.6 18 0.55 630 16 610 14 590 12 10 570 IQ 550 8 G=1 0.5 Sew Rate (V/µs) G=1 650 20 ISC (mA) 670 0.45 0.4 0.35 530 6 510 4 490 2 0.25 0 0.2 470 –60 –40 –20 20 0 40 60 80 0.
PAGE 7
TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VS = ±15V, G = 0.1, RL = 10kΩ connected to ground and Ref pin connected to ground, unless otherwise noted. OFFSET VOLTAGE PRODUCTION DISTRIBUTION OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION 40 30 Typical production distribution of packaged units. Typical production distribution of packaged units.
PAGE 8
APPLICATION INFORMATION SETTING THE GAIN The gain of the INA146 is set by using two external resistors, RG1 and RG2, according to the equation: The INA146 is a programmable gain difference amplifier consisting of a gain of 0.1 difference amplifier and a programmable-gain output buffer stage. Basic circuit connections are shown in Figure 1. Power supply bypass capacitors should be connected close to pins 4 and 7 as shown. The amplifier is programmable in the range of G = 0.
PAGE 9
OFFSET TRIM The INA146 is laser-trimmed for low offset voltage and drift. Most applications require no external offset adjustment. Figure 2 shows an optional circuit for trimming the offset voltage. A voltage applied to the Ref terminal will be summed with the output signal. This can be used to null offset voltage.
PAGE 10
Pole at 106Hz G=1 1500pF RG2 10kΩ RG2 1MΩ RG1 10kΩ 5 – VIN 2 5 – VIN 2 10kΩ 6 10kΩ VO 6 + VIN 3 INA146 1 + VIN 8 1N4684 (3.3V) 3 Output clamps at approximately ±4V. INA146 1 1N914 8 22nF Pole at 720Hz FIGURE 5. Output Clamp. FIGURE 4. Noise Filtering. RG2 10kΩ 5 – VIN 2 R1 R2 0V ≤ VO ≤ 5V 10kΩ 6 + VIN 3 R3 R4 INA146 8 1 1N914 Voltage Reference (1) 5.0V or analog-to-digital VS 1N914 (1) NOTE: (1) 1/2 OPA2342 with VS connected to +5V and GND. FIGURE 6.
PAGE 11
RG2 100kΩ RG1 11kΩ Power Supply 5 For sense resistors (RS) greater than 10Ω, use series compensation resistor (RC) for good common-mode rejection. Sense resistors greater than 500Ω are not recommended. 2 RC 100Ω VO 6 RS 100Ω 3 INA146 1 8 Load VO1 FIGURE 7. Current Monitor, G = 1. +5V 24V 8.4kΩ Feedback 7 5 2 8kΩ 1V 6 SHUNT R-I Lamp/10 e.g., 0.1Ω for 1A VO 10kΩ 1V – 50mV 3 2kΩ INA146 4 1 8 Ref 10MΩ Lamp FIGURE 8.
PAGE 12
PACKAGE OPTION ADDENDUM www.ti.
PAGE 13
PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 TAPE AND REEL INFORMATION *All dimensions are nominal Device INA146UA/2K5 Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel Diameter Width (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 A0 (mm) B0 (mm) K0 (mm) P1 (mm) 6.4 5.2 2.1 8.0 W Pin1 (mm) Quadrant 12.
PAGE 14
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) INA146UA/2K5 SOIC D 8 2500 346.0 346.0 29.
PAGE 15
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.