INA270-Q1, INA271-Q1 www.ti.com SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 VOLTAGE-OUTPUT UNIDIRECTIONAL-MEASUREMENT CURRENT-SHUNT MONITORS Check for Samples: INA270-Q1, INA271-Q1 FEATURES APPLICATIONS • • • • • • • • • • • 1 • • • • • Qualified for Automotive Applications Wide Common-Mode Range: –16 V to 80 V CMRR: 120 dB Accuracy: – ±2.5-mV Offset (Max) – ±1% Gain Error (Max) – 20-mV/°C Offset Drift (Max) – 55-ppm/°C Gain Drift (Max) Bandwidth: Up to 130 kHz Two Transfer Functions Available: – 14 V/V (INA270) – 20 V/V (INA271) Quiescent Current: 900 mA (Max) Power Supply: 2.7 V to 18 V Provision for Filtering Power Management Automotive Telecom Equipment Notebook Computers Battery Chargers Cell Phones Welding Equipment D PACKAGE (TOP VIEW) IN– 1 8 IN+ GND 2 7 NC PRE OUT 3 6 V+ BUF IN 4 5 OUT NC – No internal connection DESCRIPTION/ORDERING INFORMATION The INA270 and INA271 family of current-shunt monitors with voltage output can sense voltage drops across current shunts at common-mode voltages from –16 V to 80 V, independent of the supply voltage. The INA270 and INA271 pinouts readily enable filtering. The INA270 and INA271 are available with two output voltage scales: 14 V/V and 20 V/V. The 130-kHz bandwidth simplifies use in current-control loops. The INA270 and INA271 operate from a single 2.7-V to 18-V supply, drawing a maximum of 900 mA of supply current. They are specified over the extended operating temperature range of –40°C to 125°C and are offered in an SO-8 package. ORDERING INFORMATION (1) TA –40°C to 125°C (1) (2) PACKAGE (2) GAIN 14 20 SOIC – D Reel of 2500 ORDERABLE PART NUMBER TOP-SIDE MARKING INA270AQDRQ1 INA270 INA271AQDRQ1 INA271 For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. <br/> <br/> <br/> <br/> 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2007–2010, Texas Instruments Incorporated INA270-Q1, INA271-Q1 SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments 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. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. FUNCTIONAL BLOCK DIAGRAM RS −16 V to +80 V Supply Load Single-Pole Filter Capacitor +2.7 V to +18 V IN+ IN– 5 kW PRE OUT BUF IN 0.01 µF V+ 0.1 µF 5 kW OUT A1 96 kW A2 RL INA270 GND ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) VALUE VS Supply voltage 18 V Differential analog input voltage range (VIN+ – VIN–) –18 V to 18 V Common-mode analog input voltage range –16 V to 80 V VO Analog output voltage range (OUT and PRE OUT) II Input current (any pin) qJA Package thermal impedance (2) TJ Maximum junction temperature TA Operating free-air temperature range Tstg Storage temperature range ESD (1) (2) (3) 2 (GND – 0.3) V to (V+ + 0.3) V 5 mA (3) Electrostatic discharge rating 97.1°C/W 150°C –40 to 125°C –65 to 150°C Human-Body Model HBM) 2000 V Machine Model (MM) 100 V Charged-Device Model (CDM) 1000 V Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Maximum power dissipation is a function of TJ(max), qJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/qJA. Operating at the absolute maximum TJ of 150°C can affect reliability. The package thermal impedance is calculated in accordance with JESD 51-7. Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 INA270-Q1, INA271-Q1 www.ti.com SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 RECOMMENDED OPERATING CONDITIONS MIN MAX VS Supply voltage 2.7 18 UNIT V TA Operating free-air temperature –40 125 °C TYP MAX UNIT 0.15 (VS – 0.2)/ Gain V 80 V ELECTRICAL CHARACTERISTICS VS = 5 V, VCM = 12 V, VSENSE = 100 mV, PRE OUT connected to BUF IN (unless otherwise noted) PARAMETER TEST CONDITIONS TA (1) MIN Input VSENSE Full-scale input voltage VCM Common-mode input voltage CMRR Common-mode rejection VOS Offset voltage, RTI (2) ΔVOS/ΔT Input offset voltage temperature coefficient PSR Offset voltage power-supply rejection IIB ZO VSENSE = VIN+ + VIN– Full range –16 VIN+ = –16 V to 80 V 25°C 80 120 VIN+ = 12 V to 80 V Full range 100 120 25°C ±0.5 Full range dB 2.5 ±3 mV Full range 2.5 20 mV/°C VS = 2.7 V to 18 V, VCM = 18 V Full range 5 100 mV/V Input bias current IN– pin Full range ±8 ±16 Output impedance (3) PRE OUT pin 25°C 96 kΩ Buffer input bias current 25°C –50 nA Buffer input bias current temperature coefficient 25°C ±0.3 nA/°C Output (VSENSE ≥ 20 mV) mA (4) G Gain GBUF Output buffer gain Total gain error INA270 INA271 VSENSE = 20 mV to 100 mV Total gain error temperature coefficient 25°C 14 V/V 20 25°C 2 25°C ±0.2 V/V ±1 % Full range ±2 Full range 50 ppm/°C 25°C Total output error (5) ZO 25°C Full range ±0.75 ±2.2 ±1 ±3 % Nonlinearity error VSENSE = 20 mV to 100 mV 25°C ±0.002 % Output impedance OUT pin 25°C 1.5 Ω Maximum capacitive load No sustained oscillation 25°C 10 nF Voltage Output (6) (1) (2) (3) (4) (5) (6) Swing to V+ power-supply rail RL = 10 kΩ to GND Full range V+ – 0.05 V+ – 0.2 V Swing to GND RL = 10 kΩ to GND Full range VGND + 0.003 VGND + 0.05 V Full range is –40°C to 125°C. RTI = referred to input Initial resistor variation is ±30% with an additional –2200-ppm/°C temperature coefficient. For output behavior when VSENSE < 20 mV, see Application Information Total output error includes effects of gain error and VOS. See Typical Characteristics curve Output Swing vs Output Current and Accuracy Variations as a Result of VSENSE and Common-Mode Voltage in the Application Information section. Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 Submit Documentation Feedback 3 INA270-Q1, INA271-Q1 SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) VS = 5 V, VCM = 12 V, VSENSE = 100 mV, PRE OUT connected to BUF IN (unless otherwise noted) PARAMETER TEST CONDITIONS TA (1) MIN TYP MAX UNIT Frequency Response BW Bandwidth CL = 5 pF 25°C 130 fm Phase margin CL < 10 nF 25°C 40 ° SR Slew rate 25°C 1 V/ms ts Settling time (1%) 25°C 2 ms 25°C 40 nV/√Hz 25°C 700 900 Full range 350 950 Noise, RTI Vn VSENSE = 10 mV to 100 mV, CL = 5 pF kHz (7) Voltage noise density Power Supply IQ (7) 4 Quiescent current VOUT = 2 V VSENSE = 0 V mA RTI = referred to input Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 INA270-Q1, INA271-Q1 www.ti.com SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 TYPICAL CHARACTERISTICS TA = 25°C, VS = 12 V, VCM = 12 V, VSENSE = 100 mV (unless otherwise noted) GAIN vs FREQUENCY GAIN vs FREQUENCY 45 45 CLOAD = 0 pF 40 40 35 35 30 Gain (dB) Gain (dB) CLOAD = 1000 pF G = 20 25 G = 14 20 30 G = 14 20 15 15 10 10 5 G = 20 25 5 10k 100k 1M 10k 100k Frequency (Hz) COMMON-MODE AND POWER-SUPPLY REJECTION vs FREQUENCY GAIN PLOT 20 VS = 18V 18 140 130 VOUT (V) 14 Common- Mode and Power- Supply Rejection (dB) 16 20V/V 12 10 8 14V/V 6 4 2 1200 120 CMRR 110 100 90 PSR 80 70 60 50 40 1300 1100 900 1000 800 700 500 600 400 200 300 0 100 0 10 100 1k 10k 100k Frequency (Hz) VDIFFERENTIAL (mV) TOTAL OUTPUT ERROR vs VSENSE OUTPUT ERROR vs COMMON-MODE VOLTAGE 4.0 0.1 3.5 0.09 0.08 3.0 Output Error (%) Total Output Error (% error of the ideal output value) 1M Frequency (Hz) 2.5 2.0 1.5 1.0 0.07 0.06 0.05 0.04 0.03 0.02 0.5 0.01 0 0 50 100 150 200 250 300 350 400 450 500 0 –16 –12 –8 –4 VSENSE (mV) 0 4 8 12 16 20 ... 76 80 Common-Mode Voltage (V) Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 Submit Documentation Feedback 5 INA270-Q1, INA271-Q1 SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) TA = 25°C, VS = 12 V, VCM = 12 V, VSENSE = 100 mV (unless otherwise noted) POSITIVE OUTPUT VOLTAGE SWING vs OUTPUT CURRENT QUIESCENT CURRENT vs OUTPUT VOLTAGE 1000 12 900 11 VS = 12 V 800 Sourcing Current 700 25°C 8 –40°C 125°C 7 6 VS = 3 V 5 –40°C Output stage is designed to source current. Current sinking capability is approximately 400 µA. 3 2 1 125°C 0 0 600 500 400 300 Sourcing Current 25°C 4 IQ (µA) Output Voltage (V) 10 9 200 100 0 0 5 10 25 20 15 1 2 30 3 4 5 7 6 8 9 10 Output Voltage (V) Output Current (mA) QUIESCENT CURRENT vs COMMON-MODE VOLTAGE 34 VSENSE = 100 mV VS = 12 V VS = 2.7 V 775 IQ (µA) 675 575 475 VS = 12 V 375 VSENSE = 0 mV VS = 2.7 V 275 175 −16 −12 −8 −4 Output Short-Circuit Current (mA) 875 OUTPUT SHORT-CIRCUIT CURRENT vs SUPPLY VOLTAGE –40°C 30 25°C 26 125°C 22 18 14 10 6 0 4 8 12 16 20 ... 2.5 3.5 76 80 4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 17 18 Supply Voltage (V) VCM (V) PREOUT OUTPUT RESISTANCE PRODUCTION DISTRIBUTION BUFFER GAIN vs FREQUENCY 200 150 Population Gain (dB) Phase 100 50 Gain 0 −50 100 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 112 114 116 118 120 10 1k 10k 100k 1M 10M Frequency (Hz) RPREOUT (kW) 6 Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 INA270-Q1, INA271-Q1 www.ti.com SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 TYPICAL CHARACTERISTICS (continued) TA = 25°C, VS = 12 V, VCM = 12 V, VSENSE = 100 mV (unless otherwise noted) LARGE-SIGNAL STEP RESPONSE 10-mV TO 100-mV INPUT 500 mV/div 50 mV/div SMALL-SIGNAL STEP RESPONSE 10-mV TO 20-mV INPUT 10 µs/div 10 µs/div Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 Submit Documentation Feedback 7 INA270-Q1, INA271-Q1 SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 www.ti.com APPLICATION INFORMATION Basic Connection Figure 1 illustrates the basic connection of the INA270 and INA271. The input pins, IN+ and IN–, should be connected as closely as possible to the shunt resistor to minimize any resistance in series with the shunt resistance. Power-supply bypass capacitors are required for stability. Applications with noisy or high-impedance power supplies may require additional decoupling capacitors to reject power-supply noise. Minimum bypass capacitors of 0.01 mF and 0.1 mF in value should be placed close to the supply pins. Although not mandatory, an additional 10-mF electrolytic capacitor placed in parallel with the other bypass capacitors may be useful in applications with particularly noisy supplies. RS −16 V to +80 V Supply Load Single-Pole Filter Capacitor +2.7 V to +18 V IN+ IN– 5 kW PRE OUT BUF IN 0.01 µF V+ 0.1 µF 5 kW OUT A1 96 kW A2 RL INA270 GND Figure 1. INA270 Basic Connections Power Supply The input circuitry of the INA270 and INA271 can accurately measure beyond its power-supply voltage, V+. For example, the V+ power supply can be 5 V, whereas the load power-supply voltage is up to 80 V. The output voltage range of the OUT terminal, however, is limited by the voltages on the power-supply pin. Selecting RS The value chosen for the shunt resistor, RS, depends on the application and is a compromise between small-signal accuracy and maximum permissible voltage loss in the measurement line. High values of RS provide better accuracy at lower currents by minimizing the effects of offset, while low values of RS minimize voltage loss in the supply line. For most applications, best performance is attained with an RS value that provides a full-scale shunt voltage range of 50 mV to 100 mV. Maximum input voltage for accurate measurements is (VS – 0.2)/Gain. Transient Protection The –16-V to 80-V common-mode range of the INA270 and INA271 is ideal for withstanding automotive fault conditions ranging from 12-V battery reversal up to 80-V transients, since no additional protective components are needed up to those levels. In the event that the INA270 and INA271 are exposed to transients on the inputs in excess of their ratings, external transient absorption with semiconductor transient absorbers (zeners or Transzorbs) are necessary. 8 Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 INA270-Q1, INA271-Q1 www.ti.com SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 Use of MOVs or VDRs is not recommended except when they are used in addition to a semiconductor transient absorber. Select the transient absorber such that it will never allow the INA270 and INA271 to be exposed to transients greater than 80 V (that is, allow for transient absorber tolerance, as well as additional voltage because of transient absorber dynamic impedance). Despite the use of internal zener-type ESD protection, the INA270 and INA271 are not suited to using external resistors in series with the inputs, since the internal gain resistors can vary up to ±30%, but the internal resistors are tightly matched. If gain accuracy is not important, then resistors can be added in series with the INA270 and INA271 inputs, with two equal resistors on each input. Output Voltage Range The output of the INA270 and INA271 is accurate within the output voltage swing range set by the power-supply pin, V+. The INA270 and INA271 readily enable the inclusion of filtering between the preamp output and buffer input. Single-pole filtering can be accomplished with a single capacitor because of the 96-kΩ output impedance at PRE OUT on pin 3 (see Figure 2a). The INA270 and INA271 readily lend themselves to second-order Sallen-Key configurations (see Figure 2b). When designing these configurations consider that the PRE OUT 96-kΩ output impedance exhibits an initial variation of ±30% with the addition of a –2200-ppm/°C temperature coefficient. RS Supply Load RS Supply Load Second-Order, Sallen-Key Filter Connection CFILT Single-Pole Filter Capacitor RS CFILT +2.7 V to +18 V +2.7 V to +18 V IN+ PRE OUT IN– 5 kW BUF IN V+ IN+ 5 kW 5 kW Output A1 V+ 5 kW Output 96 kW A2 RL RL IN A 270 IN A 270 GND a ) S i n g le - P o le F ilt e r A. BUF IN A1 96 kW A2 PRE OUT IN– GND b ) S e c o n d - O r d e r, S a lle n - K e y F i lt e r The INA270 and INA271 can be easily connected for first-order or second-order filtering. Remember to use the appropriate buffer gain (INA270 = 1.4, INA271 = 2) when designing Sallen-Key configurations. Figure 2. First-Order or Second-Order Filtering Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 Submit Documentation Feedback 9 INA270-Q1, INA271-Q1 SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 www.ti.com Accuracy Variations as a Result of VSENSE and Common-Mode Voltage The accuracy of the INA270 and INA271 current-shunt monitors is a function of two main variables: VSENSE (VIN+ – VIN–) and common-mode voltage, VCM, relative to the supply voltage, VS. VCM is expressed as (VIN+ + VIN–)/2; however, in practice, VCM is seen as the voltage at VIN+ because the voltage drop across VSENSE is usually small. This section addresses the accuracy of these specific operating regions: Normal Case 1: VSENSE ≥ 20 mV, VCM ≥ VS Normal Case 2: VSENSE ≥ 20 mV, VCM < VS Low VSENSE Case 1: VSENSE < 20 mV, –16 V ≤ VCM < 0 Low VSENSE Case 2: VSENSE < 20 mV, 0 V ≤ VCM ≤ VS Low VSENSE Case 3: VSENSE < 20 mV, VS < VCM ≤ 80 V Normal Case 1: VSENSE ≥ 20 mV, VCM ≥ VS This region of operation provides the highest accuracy. Here, the input offset voltage is characterized and measured using a two-step method. First, the gain is determined by Equation 1. VOUT1 – VOUT2 G= 100 mV – 20 mV (1) Where: VOUT1 = Output voltage with VSENSE = 100 mV VOUT2 = Output voltage with VSENSE = 20 mV Then the offset voltage is measured at VSENSE = 100 mV and referred to the input (RTI) of the current-shunt monitor, as shown in Equation 2. VOUT1 – 100 mV VOSRTI (referred to input) = G (2) ( ( In Typical Characteristics, the Output Error vs Common-Mode Voltage curve shows the highest accuracy for the this region of operation. In this plot, VS = 12 V; for VCM ≥ 12 V, the output error is at its minimum. This case is also used to create the VSENSE ≥ 20 mV output specifications in Electrical Characteristics. Low VSENSE Case 1: VSENSE < 20 mV, –16 V ≤ VCM < 0; and Low VSENSE Case 3: VSENSE < 20 mV, VS < VCM ≤ 80 V Although the INA270 family of devices are not designed for accurate operation in either of these regions, some applications are exposed to these conditions. For example, when monitoring power supplies that are switched on and off while VS is still applied to the INA270 or INA271, it is important to know what the behavior of the devices is in these regions. As VSENSE approaches 0 mV, in these VCM regions, the device output accuracy degrades. A larger-than-normal offset can appear at the current-shunt monitor output with a typical maximum value of VOUT = 60 mV for VSENSE = 0 mV. As VSENSE approaches 20 mV, VOUT returns to the expected output value with accuracy as specified in Electrical Characteristics. Figure 3 illustrates this effect using the INA271 (Gain = 20). 10 Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 INA270-Q1, INA271-Q1 www.ti.com SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 0.40 0.36 0.32 VOUT (V) 0.28 0.24 Actual 0.20 0.16 Ideal 0.12 0.08 0.04 0 0 2 4 6 8 10 12 14 16 18 20 VSENSE (mV) Figure 3. Example for Low VSENSE Cases 1 and 3 (INA271, Gain = 20) Low VSENSE Case 2: VSENSE < 20 mV, 0 V ≤ VCM ≤ VS This region of operation is the least accurate for the INA270 family. To achieve the wide input common-mode voltage range, these devices use two operational amplifier (op amp) front ends in parallel. One op amp front end operates in the positive input common-mode voltage range, and the other in the negative input region. For this case, neither of these two internal amplifiers dominates and overall loop gain is very low. Within this region, VOUT approaches voltages close to linear operation levels for Normal Case 2. This deviation from linear operation becomes greatest the closer VSENSE approaches 0 V. Within this region, as VSENSE approaches 20 mV, device operation is closer to that described by Normal Case 2. Figure 4 illustrates this behavior for the INA271. The VOUT maximum peak for this case is determined by maintaining a constant VS, setting VSENSE = 0 mV and sweeping VCM from 0 V to VS. The exact VCM at which VOUT peaks during this case varies from part to part. The maximum peak voltage for the INA270 is 0.28 V; for the INA271, the maximum peak voltage is 0.4 V. 0.48 INA271 VOUT Limit(1) 0.48 VCM1 0.40 Ideal VOUT (V) 0.36 0.32 VCM2 0.28 VCM3 0.24 0.20 0.16 VOUT limit at VSENSE = 0mV, 0 ≤ VCM1 ≤ VS VCM4 0.12 VCM2, VCM3, and VCM4 illustrate the variance from part to part of the VCM that can cause maximum VOUT with VSENSE < 20mV. 0.08 0.04 0 0 2 4 6 8 10 12 14 16 18 20 22 24 VSENSE (mV) Figure 4. Example for Low VSENSE Case 2 (INA271, Gain = 20) Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 Submit Documentation Feedback 11 INA270-Q1, INA271-Q1 SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 www.ti.com Shutdown The INA270 and INA271 do not provide a shutdown pin; however, because they consume a quiescent current less than 1 mA, they can be powered by either the output of logic gates or by transistor switches to supply power. Driving the gate low shuts down the INA270/INA271. Use a totem-pole output buffer or gate that can provide sufficient drive along with 0.1-mF bypass capacitor, preferably ceramic with good high-frequency characteristics. This gate should have a supply voltage of 3 V or greater, because the INA270 and INA271 require a minimum supply greater than 2.7 V. In addition to eliminating quiescent current, this gate also turns off the 10-mA bias current present at each of the inputs. Note that the IN+ and IN– inputs are able to withstand full common-mode voltage under all powered and under-powered conditions. An example shutdown circuit is shown in Figure 5. IL RS −16 V to +80 V Supply Single-Pole Filter Capacitor IN+ Negative and Positive Common-Mode Voltage IN– 5 kW PRE OUT Load BUF IN V+ 5 kW V+ > 3 V OUT A1 74HC04 0.01 µF 96 kW A2 RL INA270, INA271 GND Figure 5. INA270/INA271 Example Shutdown Circuit RFI/EMI Attention to good layout practices is always recommended. Keep traces short and, when possible, use a printed circuit board (PCB) ground plane with surface-mount components placed as close to the device pins as possible. Small ceramic capacitors placed directly across amplifier inputs can reduce RFI/EMI sensitivity. PCB layout should locate the amplifier as far away as possible from RFI sources. Sources can include other components in the same system as the amplifier itself, such as inductors (particularly switched inductors handling a lot of current and at high frequencies). RFI can generally be identified as a variation in offset voltage or dc signal levels with changes in the interfering RF signal. If the amplifier cannot be located away from sources of radiation, shielding may be needed. Twisting wire input leads makes them more resistant to RF fields. The difference in input pin location of the INA270 and INA271 versus the INA193 through INA198 may provide different EMI performance. 12 Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 PACKAGE OPTION ADDENDUM www.ti.com 23-Oct-2010 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) INA270AQDRQ1 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Request Free Samples INA271AQDRQ1 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Request Free Samples (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (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. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. 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