Datasheet

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

INA148

FEATURES

● HIGH COMMON-MODE VOLTAGE:

+75V at V

= +5V

±200V at V

= ±15V

● FIXED DIFFERENTIAL GAIN = 1V/V

● LOW QUIESCENT CURRENT: 260µA

● WIDE SUPPLY RANGE:

Single Supply: 2.7V to 36V

Dual Supplies: ±1.35V to ±18V

● LOW GAIN ERROR: 0.075% max

● LOW NONLINEARITY: 0.002% max

● HIGH CMR: 86dB

● SO-8 PACKAGE

±200V Common-Mode Voltage

DIFFERENCE AMPLIFIER

DESCRIPTION

The INA148 is a precision, low-power, unity-gain

difference amplifier with a high common-mode input

voltage range. It consists of a monolithic precision

bipolar op amp with a thin-film resistor network.

The on-chip resistors are laser trimmed for an accu-

rate 1V/V differential gain and high common-mode

rejection. Excellent temperature tracking of the resis-

tor network maintains high gain accuracy and com-

mon-mode rejection over temperature. The INA148

will operate on single or dual supplies.

The INA148 is available in a small SO-8 surface-

mount package and it is specified for the –40°C to

+85°C extended industrial temperature range.

APPLICATIONS

● CURRENT SHUNT MEASUREMENTS

● DIFFERENTIAL SENSOR AMPLIFIERS

● LINE RECEIVERS

● BATTERY POWERED SYSTEMS

● AUTOMOTIVE INSTRUMENTATION

● STACKED CELL MONITORS

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

INA148

1MΩ 50kΩ

52.6316kΩ

50kΩ

2.7778kΩ

1MΩ

V+

INA148

V– Ref

–

SBOS123

Summary of content (16 pages)

PAGE 1
® INA148 INA 148 For most current data sheet and other product information, visit www.burr-brown.com ±200V Common-Mode Voltage DIFFERENCE AMPLIFIER FEATURES DESCRIPTION ● HIGH COMMON-MODE VOLTAGE: +75V at VS = +5V ±200V at VS = ±15V ● FIXED DIFFERENTIAL GAIN = 1V/V ● LOW QUIESCENT CURRENT: 260µA ● WIDE SUPPLY RANGE: Single Supply: 2.7V to 36V Dual Supplies: ±1.35V to ±18V ● LOW GAIN ERROR: 0.075% max ● LOW NONLINEARITY: 0.
PAGE 2
SPECIFICATIONS: VS = ±5V to ±15V Dual Supplies At TA = +25°C, RL = 10kΩ connected to ground and Ref pin connected to ground, unless otherwise noted. PARAMETER CONDITIONS OFFSET VOLTAGE (VO) Input Offset Voltage Drift vs Power Supply INPUT VOLTAGE RANGE Common-Mode Voltage Range Common-Mode Rejection MIN VOS ∆VOS/∆T PSRR VCM CMRR VS = ±15V, VCM = 0V VS = ±5V, VCM = 0V At TA = –40°C to +85°C VS = ±1.
PAGE 3
SPECIFICATIONS: VS = +5V Single Supply At TA = +25°C, RL = 10kΩ connected to VS/2 and Ref pin connected to VS/2, unless otherwise noted. PARAMETER OFFSET VOLTAGE (VO) Input Offset Voltage Drift vs Power Supply INPUT VOLTAGE RANGE Common-Mode Voltage Range Common-Mode Rejection CONDITIONS MIN VOS ∆VOS/∆T PSRR VCM CMRR ±1 ±10 ±50 VCM = VS/2 At TA = –40°C to +85°C VS = +2.7V to +36V, VCM = VS/2 + – (VIN ) – (VIN ) = 0V, VREF = 0.25V + ) – (V – ) = 0V, V (VIN IN REF = VS/2 VCM = –47.5V to +32.
PAGE 4
ELECTROSTATIC DISCHARGE SENSITIVITY PIN CONFIGURATION TOP VIEW SO-8 Ref 1 8 NC –In 2 7 V+ +In 3 6 Out V– 4 5 NC 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 5
TYPICAL PERFORMANCE CURVES At TA = +25°C, VS = ±15V, RL = 10kΩ to common, and VREF = 0V, unless otherwise noted. COMMON-MODE REJECTION vs FREQUENCY GAIN vs FREQUENCY 5 100 VS= ±1.35V = VS = ±15V = VS = ±1.35V 0 VS = ±15V Voltage Gain (dB) Voltage Gain (dB) 80 –5 –10 –20 –25 60 40 20 –30 0 –35 10 100 10k 1k 100k 1M 10 100 90 PSR+ (VS = ±1.35V) PSR– (VS = ±18V) 60 PSR– (VS = ±1.
PAGE 6
TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VS = ±15V, RL = 10kΩ to common, and VREF = 0V, unless otherwise noted.
PAGE 7
TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VS = ±15V, RL = 10kΩ to common, and VREF = 0V, unless otherwise noted. OFFSET VOLTAGE PRODUCTION DISTRIBUTION OFFSET VOLTAGE PRODUCTION DISTRIBUTION 24 VS = ±15V Percent of Amplifiers (%) Percent of Amplifiers (%) 24 18 12 6 VS = ±2.5V 20 16 12 8 4 5.0 4.0 3.0 2.0 1.0 0.0 OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION 20 20 VS = ±15V Percent of Amplifiers (%) 15 10 5 VS = ±2.
PAGE 8
TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, VS = ±15V, RL = 10kΩ to common, and VREF = 0V, unless otherwise noted. INVERTING INPUT 50% OVERLOAD RECOVERY TIME NON-INVERTING INPUT 50% OVERLOAD RECOVERY TIME VS = ±15V VIN VS = ±15V VIN+ 0V – VOUT 5V/div 5V/div VOUT 0V 0V 5µs/div 5µs/div APPLICATION INFORMATION capacitors should be connected as close to pins 4 and 7 as practicable. Ceramic or tantalum types are recommended for use as bypass capacitors.
PAGE 9
THE GAIN EQUATION An internal on-chip resistor network sets the overall differential gain of the INA148 to precisely 1V/V. It’s output is accordance with the equation: + – V– ) + V VOUT = (VIN IN REF OFFSET TRIM The INA148 is laser-trimmed for low offset voltage and drift. Most applications will require no external offset adjustment.
PAGE 10
Preferably, the offset trim voltage applied to the Ref pin should be buffered with an amp such as an OPA237 (see Figure 3). In this case, the op amp output impedance is low enough that no external resistor is needed to maintain the INA148’s excellent CMR. Unless the shunt resistor is less than approximately 100Ω, an additional equal compensating resistor (RC) is recommended to maintain input balance and high CMR.
PAGE 11
+VS fC ≅ 0.75 Hz HPF 7 – VIN 2 U1 1MΩ 50kΩ 50kΩ + – VO = (VIN – VIN ) + VREF 2.7778kΩ 6 VO A1 + VIN 3 52.6316kΩ 1MΩ 1MΩ INA148 1 4 0.22µF –VS +VS 7 U2: OPA132 for VS = ±5V to ±15V OPA340 for VS = ±2.5 2 6 U2 4 VREF 3 –VS FIGURE 6. Quasi-AC-Coupled Differential Amplifier. +5V 0.1µF 7 – VIN 2 1MΩ 50kΩ 50kΩ + – V – ) + 1.235V VO = (VIN IN 2.7778kΩ 6 VCM = –23V to +56V + VIN 3 VO A1 52.6316kΩ 1MΩ INA148 4 1 34kΩ 5Ω +5V 10µF + REF1004-1.2 FIGURE 7.
PAGE 12
0.47µF ceramic (all) RS 50mV shunt I 6 +15 +VISO VCM = ±200V max +VS IN5245 5 1kΩ C 200kΩ 0.1µF +VISO 2 O IN5245 +15V 7 –VISO 6 7 3 4 2 –15 DCP011515D 7 OPA277 +15V 1 2 1MΩ 50kΩ 50kΩ –VISO 2.7778kΩ 6 VO A1 ±50mV Input = ±10V Output 3 52.6316kΩ 1MΩ INA148 4 0.1µF 1 –15V FIGURE 9. 50mV Current Shunt Amplifier with ±200V Common-Mode Voltage Range.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.
PAGE 14
PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 TAPE AND REEL INFORMATION *All dimensions are nominal Device INA148UA/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 15
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) INA148UA/2K5 SOIC D 8 2500 346.0 346.0 29.
PAGE 16
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.