INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1 SBOS366C - Datasheet Archive

 

INA196A-Q1, INA197A-Q1, INA198A-Q1

 

INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 www.ti.com. SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008 CURRENT SHUNT MONITORS ­16-V to +80-V Common-Mode Range FEATURES APPLICATIONS · · · · · · · · · 1 · · · · Qualified for Automotive Applications Wide Common-Mode Voltage: ­16 V to +80 V Low Error: 3.0% Over Temperature (Max) Bandwidth: Up to 500 kHz Three Transfer Functions Available: 20 V/V, 50 V/V, and 100 V/V Complete Current-Sense Solution Welding Equipment Notebook Computers Cell Phones Telecom Equipment Automotive Power Management Battery Chargers DESCRIPTION The INA193A INA193A­INA198A INA198A family of current shunt monitors with voltage output can sense drops across shunts at common-mode voltages from ­16 V to +80 V, independent of the INA19xA supply voltage. They are available with three output voltage scales: 20 V/V, 50 V/V, and 100 V/V. The 500-kHz bandwidth simplifies use in current control loops. The INA193A INA193A­INA195A INA195A provide identical functions but alternative pin configurations to the INA196A INA196A­INA198A INA198A, respectively. The INA193A INA193A­INA198A INA198A operate from a single 2.7-V to 18-V supply. They are specified over the extended operating temperature range (­40°C to 125°C), and are offered in a space-saving SOT-23 package. RS IS VIN+ ­16 V to +80 V Negative and Positive Common-Mode Voltage V+ 2.7 V to 18 V VIN+ VIN­ Load 5 k 5 k A1 A2 OUT = ISRSRL 5 k RL INA193A INA193A­INA198A INA198A 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 © 2006­2008, Texas Instruments Incorporated INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008. 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. ORDERING INFORMATION (1) PACKAGE (2) TA ORDERABLE PART NUMBER TOP-SIDE MARKING INA193AQDBVRQ1 INA193AQDBVRQ1 (1) (2) Reel of 3000 BOI INA196AQDBVRQ1 INA196AQDBVRQ1 BOJ BOK INA198AQDBVRQ1 INA198AQDBVRQ1 SOT-23 ­ DBV BOH INA195AQDBVRQ1 INA195AQDBVRQ1 INA197AQDBVRQ1 INA197AQDBVRQ1 ­40°C to 125°C BOG INA194AQDBVRQ1 INA194AQDBVRQ1 BOL For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the website at www.ti.com. Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. INA193A INA193A INA194A INA194A INA195A INA195A DBV PACKAGE (TOP VIEW) OUT 1 INA196A INA196A INA197A INA197A INA198A INA198A DBV PACKAGE (TOP VIEW) 5 V+ GND 2 VIN+ 3 OUT 1 5 VIN­ GND 2 4 VIN­ V+ 3 4 VIN+ ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) MIN MAX Supply voltage UNIT 18 V Differential input voltage range, analog inputs (VIN+ ­ VIN­) ­18 18 V Common-mode voltage range (2) ­16 80 V GND ­ 0.3 (V+) + 0.3 Analog output voltage range (2) OUT Input current into any pin (2) ­65 Junction temperature Human-Body Model (2) 2 150 °C °C 4000 Machine Model 200 Charged-Device Model (1) mA 150 Storage temperature range ESD qualification ratings V 5 V 1000 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. Input voltage at any pin may exceed the voltage shown if the current at that pin is limited to 5 mA. Submit Documentation Feedback Copyright © 2006­2008, Texas Instruments Incorporated Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 www.ti.com. SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008 ELECTRICAL CHARACTERISTICS VS = 12 V, VIN+ = 12 V, VSENSE = 100 mV (unless otherwise noted) Full range TA = ­40°C to 125°C PARAMETER TEST CONDITIONS TA MIN TYP MAX UNIT 0.15 (VS ­ 0.2)/ Gain V 80 V INPUT VSENSE Full-scale input voltage VCM VSENSE = VIN+ - VIN­ Common-mode input CMR Common-mode rejection VOS Offset voltage vs temperature PSR Offset voltage vs power supply IB Input bias current Full range VIN+ = -16 V to +80 V Offset voltage, RTI dVOS/dT 25°C VIN+ = 12 V to 80 V ­16 25°C 80 94 Full range 100 120 dB 25°C ±0.5 2 Full range 0.5 3 Full range 2.5 VS = 2.7 V to 18 V, VIN+ = 18 V Full range 5 100 µV/V VIN­ pin Full range ±8 ±23 µA mV µV/°C OUTPUT (VSENSE 20 mV) INA193A INA193A, INA196A INA196A G Gain INA194A INA194A, INA197A INA197A 20 25°C INA195A INA195A, INA198A INA198A Gain error VSENSE = 20 mV to 100 mV Nonlinearity error OUTPUT (VSENSE < 20 mV) ±0.2 ±1 ±2 ±0.75 ±2.2 ±1 ±3 25°C ±0.002 ±0.1 1.5 No sustained oscillation 25°C 10 nF ­16 V VCM < 0 300 VS < VCM 80 V 300 INA193A INA193A, INA196A INA196A INA194A INA194A, INA197A INA197A 0.4 25°C 0 V VCM VS, VS = 5 V 1 V 2 (3) Swing to V+ power-supply rail RL = 100 k to GND Full range V+ ­ 0.1 Swing to GND (4) (3) (4) % mV INA195A INA195A, INA198A INA198A (1) (2) % (2) Output voltage VOLTAGE OUTPUT % 25°C VSENSE = 20 mV to 100 mV All devices VOUT 25°C Full range Output impedance Maximum capacitive load V/V Full range 25°C Total output error (1) RO 50 100 RL = 100 k to GND Full range VGND + 3 VGND + 50 V+ ­ 0.2 V mV Total output error includes effects of gain error and VOS. For details on this region of operation, see Accuracy Variations as a Result of VSENSE and Common-Mode Voltage in Applications Information. See Typical Characteristics curve Output Swing vs Output Current. Specified by design Copyright © 2006­2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 3 INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008. www.ti.com ELECTRICAL CHARACTERISTICS (continued) VS = 12 V, VIN+ = 12 V, VSENSE = 100 mV (unless otherwise noted) Full range TA = ­40°C to 125°C PARAMETER TEST CONDITIONS TA MIN TYP MAX UNIT FREQUENCY RESPONSE INA193A INA193A, INA196A INA196A BW Bandwidth INA194A INA194A, INA197A INA197A 500 CLOAD = 5 pF 25°C 300 INA195A INA195A, INA198A INA198A Phase margin SR Settling time (1%) 200 CLOAD < 10 nF 25°C 40 ° 1 V/µs 25°C 2 µs 25°C 40 nV/Hz Slew rate ts kHz VSENSE = 10 mV to 100 mVPP, CLOAD = 5 pF NOISE, RTI Voltage noise density POWER SUPPLY VS Operating voltage Full range VOUT = 2 V IQ Quiescent current INA193A INA193A, INA194A INA194A, INA196A INA196A, INA197A INA197A 2.7 Full range 18 950 370 1050 Full range INA195A INA195A, INA198A INA198A V 1250 370 VSENSE = 0 mV 700 µA TEMPERATURE RANGE Operating temperature Storage temperature JA 4 ­40 ­65 Thermal resistance Submit Documentation Feedback 125 150 200 °C °C °C/W Copyright © 2006­2008, Texas Instruments Incorporated Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 www.ti.com. SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008 TYPICAL CHARACTERISTICS TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV (unless otherwise noted) GAIN vs FREQUENCY GAIN vs FREQUENCY 45 45 40 G = 50 35 Gain (dB) 30 G = 100 40 G = 50 35 Gain (dB) CLOAD = 1000 pF G = 100 G = 20 25 20 30 G = 20 25 20 15 15 10 10 5 5 10k 100k 10k 1M 100k Frequency (Hz) COMMON-MODE and POWER-SUPPLY REJECTION vs FREQUENCY GAIN PLOT 20 140 18 130 Common- Mode and Power- Supply Rejection (dB) 100V/V 16 VOUT (V) 14 50V/V 12 10 8 20V/V 6 4 2 120 CMR 110 100 90 PSR 80 70 60 50 40 0 20 100 200 300 400 500 600 700 800 900 10 100 1k VDIFFERENTIAL (mV) 100k 10k Frequency (Hz) OUTPUT ERROR vs VSENSE OUTPUT ERROR vs COMMON-MODE VOLTAGE 4.0 0.1 3.5 0.09 0.08 3.0 Output Error (%) 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 VSENSE (mV) Copyright © 2006­2008, Texas Instruments Incorporated 0 450 500 ­16 ­12 ­8 ­4 0 4 8 12 16 20 . 76 80 Common-Mode Voltage (V) Submit Documentation Feedback Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 5 INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008. www.ti.com TYPICAL CHARACTERISTICS (continued) TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV (unless otherwise noted) POSITIVE OUTPUT VOLTAGE SWING vs OUTPUT CURRENT QUIESCENT CURRENT vs OUTPUT VOLTAGE 12 1000 11 800 25° C 8 700 125° C 7 6 5 600 VS = 3 V Sourcing Current 4 ­40° C IQ (µA) Output Voltage (V) 900 VS = 12 V Sourcing Current 10 9 25° C ­40° C 2 1 0 400 300 Output stage is designed to source current. Current sinking capability is approximately 400 µA. 3 500 200 100 125° C 0 0 5 10 15 20 25 30 0 1 2 Output Current (mA) VS = 2.7 V 575 475 VS = 12 V VSENSE = 0 mV VS = 2.7 V 275 Output Short-Circuit Current (mA) VS = 12 V 675 IQ (µA) 6 34 VSENSE = 100 mV 175 ­16 ­12 ­8 ­4 5 7 9 10 ­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) STEP RESPONSE STEP RESPONSE G = 20 Output Voltage (50 mV/div) Output Voltage (500 mV/div) G = 20 VSENSE = 10 mV to 20 mV Time (2 µs/div) 6 8 OUTPUT SHORT-CIRCUIT CURRENT vs SUPPLY VOLTAGE 775 375 4 Output Voltage (V) QUIESCENT CURRENT vs COMMON-MODE VOLTAGE 875 3 Submit Documentation Feedback VSENSE = 10 mV to 100 mV Time (2 µs/div) Copyright © 2006­2008, Texas Instruments Incorporated Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 www.ti.com. SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008 TYPICAL CHARACTERISTICS (continued) TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV (unless otherwise noted) STEP RESPONSE STEP RESPONSE G = 50 Output Voltage (50 mV/div) Output Voltage (100 mV/div) G = 20 VSENSE = 90 mV to 100 mV VSENSE = 10 mV to 20 mV Time (2 µs/div) Time (5 µs/div) STEP RESPONSE STEP RESPONSE G = 50 Output Voltage (1 V/div) Output Voltage (100 mV/div) G = 50 VSENSE = 10 mV to 100 mV VSENSE = 90 mV to 100 mV Time (5 µs/div) Time (5 µs/div) STEP RESPONSE Output Voltage (2 V/div) G = 100 VSENSE = 10 mV to 100 mV Time (10 µs/div) Copyright © 2006­2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 7 INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008. www.ti.com APPLICATION INFORMATION Basic Connection Figure 1 shows the basic connection of the INA19xA. The input pins, VIN+ and VIN­, 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. Connect bypass capacitors close to the device pins. RS IS VIN+ V+ 2.7 V to 18 V ­16 V to +80 V VIN+ 5 k VIN­ Load 5 k OUT INA193A INA193A­INA198A INA198A Figure 1. INA19xA Basic Connection Power Supply The input circuitry of the INA19xA 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. Accuracy Variations as a Result of VSENSE and Common-Mode Voltage The accuracy of the INA193A INA193A­INA198A INA198A 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. 8 Submit Documentation Feedback Copyright © 2006­2008, Texas Instruments Incorporated Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 www.ti.com. SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008 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). V OUT1 * V OUT2 G+ 100 mV * 20 mV (1) Where: VOUT1 = Output voltage with VSENSE = 100 mV VOUT2 = Output voltage with VSENSE = 20 mV The offset voltage is then measured at VSENSE = 100 mV and referred to the input (RTI) of the current shunt monitor, as shown in (Equation 2). V OSRTI (Referred-To-Input) + V G * 100 mV OUT1 (2) In the 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 the Electrical Characteristics table. Normal Case 2: VSENSE 20 mV, VCM < VS This region of operation has slightly less accuracy than Normal Case 1 as a result of the common-mode operating area in which the part functions, as seen in the Output Error vs Common-Mode Voltage curve. As noted, for this graph VS = 12 V; for VCM < 12 V, the Output Error increases as VCM becomes less than 12 V, with a typical maximum error of 0.005% at the most negative VCM = ­16 V. 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 INA193A INA193A­INA198A INA198A 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 INA193A INA193A­INA198A INA198A. It is important to know what the behavior of the devices will be 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 = 300 mV for VSENSE = 0 mV. As VSENSE approaches 20 mV, VOUT returns to the expected output value with accuracy as specified in the Electrical Characteristics. Figure 2 illustrates this effect using the INA195A INA195A and INA198A INA198A (Gain = 100). Copyright © 2006­2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 9 INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008. www.ti.com 2.0 1.8 1.6 VOUT (V) 1.4 1.2 Actual 1.0 0.8 Ideal 0.6 0.4 0.2 0 0 2 4 6 8 10 12 14 16 18 20 VSENSE (mV) Figure 2. Example for Low VSENSE Cases 1 and 3 (INA195A INA195A, INA198A INA198A: Gain = 100) Low VSENSE Case 2: VSENSE < 20 mV, 0 V VCM VS This region of operation is the least accurate for the INA193A INA193A­INA198A INA198A family. To achieve the wide input common-mode voltage range, these devices use two 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 3 illustrates this behavior for the INA195A INA195A. The VOUT maximum peak for this case is tested 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 test varies from part to part, but the VOUT maximum peak is tested to be less than the specified VOUT tested limit. 2.4 INA195 INA195, INA198 INA198 VOUT Tested Limit(1) VCM1 2.2 2.0 Ideal 1.8 VCM2 VOUT (V) 1.6 1.4 VCM3 1.2 1.0 0.8 VOUT tested limit at VSENSE = 0mV, 0 VCM1 VS. VCM4 0.6 VCM2, VCM3, and VCM4 illustrate the variance from part to part of the VCM that can cause maximum VOUT with VSENSE < 20mV. 0.4 0.2 0 0 2 4 6 8 10 12 14 16 18 20 22 24 VSENSE (mV) NOTE: (1) INA193 INA193, INA196 INA196 VOUT Tested Limit = 0.4V. INA194 INA194, INA197 INA197 VOUT Tested Limit = 1V. Figure 3. Example for Low VSENSE Case 2 (INA195A INA195A, INA198A INA198A: Gain = 100) 10 Submit Documentation Feedback Copyright © 2006­2008, Texas Instruments Incorporated Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 www.ti.com. SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008 Shutdown Because the INA193A INA193A­INA198A INA198A 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. Use a totem pole output buffer or gate that can provide sufficient drive along with 0.1 µF bypass capacitor, preferably ceramic with good high frequency characteristics. This gate should have a supply voltage of 3 V or greater because the INA193A INA193A­INA198A INA198A requires a minimum supply greater than 2.7 V. In addition to eliminating quiescent current, this gate also turns off the 10 µA bias current present at each of the inputs. An example shutdown circuit is shown in Figure 4. IL RS VIN+ -16 V to 80 V Negative and Positive Common-Mode Voltage VIN+ VIN- R1 R2 V+ Load V+ > 3 V A1 0.1 mF A2 OUT RL INA193A-INA198A INA193A-INA198A Figure 4. INA193A INA193A­INA198A INA198A Example Shutdown Circuit 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 500 mV. Transient Protection The ­16-V to +80-V common-mode range of the INA19xA 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 INA19xA is exposed to transients on the inputs in excess of its ratings, then external transient absorption with semiconductor transient absorbers (zeners or Transzorbs) are necessary. 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 never allows the INA19xA to be exposed to transients greater than 80 V (that is, allow for transient absorber tolerance, as well as additional voltage due to transient absorber dynamic impedance). Despite the use of internal zener-type ESD protection, the INA19xA does not lend itself to using external resistors in series with the inputs since the internal gain resistors can vary up to ±30%. (If gain accuracy is not important, then resistors can be added in series with the INA19xA inputs with two equal resistors on each input.) Copyright © 2006­2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 11 INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008. www.ti.com Output Voltage Range The output of the INA19xA is accurate within the output voltage swing range set by the power supply pin, V+. This is best illustrated when using the INA195A INA195A or INA198A INA198A (which are both versions using a gain of 100), where a 100-mV full-scale input from the shunt resistor requires an output voltage swing of 10 V, and a power-supply voltage sufficient to achieve 10 V on the output. 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 INA193A INA193A­INA195A INA195A versus the INA196A INA196A­INA198A INA198A may provide different EMI performance. Input Filtering An obvious and straightforward location for filtering is at the output of the INA19xA series; however, this location negates the advantage of the low output impedance of the internal buffer. The only other option for filtering is at the input pins of the INA19xA, which is complicated by the internal 5-k ± 30% input impedance (see Figure 5). Using the lowest possible resistor values minimizes both the initial shift in gain and effects of tolerance. The effect on initial gain is given by: 5 k Gain Error % = 100 ­ ( 100 × ( 5 k + RFILT (3) Total effect on gain error can be calculated by replacing the 5-k term with 5 k ­ 30% (or 3.5 k) or 5 k + 30% (or 6.5 k). The tolerance extremes of RFILT can also be inserted into the equation. If a pair of 100- 1% resistors are used on the inputs, the initial gain error is 1.96%. Worst-case tolerance conditions always occur at the lower excursion of the internal 5-k resistor (3.5 k), and the higher excursion of RFILT, 3% in this case. Note that the specified accuracy of the INA19xA must then be combined in addition to these tolerances. While this discussion treats accuracy worst-case conditions by combining the extremes of the resistor values, it is appropriate to use geometric mean or root sum square calculations to total the effects of accuracy variations. 12 Submit Documentation Feedback Copyright © 2006­2008, Texas Instruments Incorporated Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 INA193A-Q1 INA193A-Q1, INA194A-Q1 INA194A-Q1, INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1, INA197A-Q1 INA197A-Q1, INA198A-Q1 INA198A-Q1 www.ti.com. SBOS366C SBOS366C ­ AUGUST 2006 ­ REVISED OCTOBER 2008 RSHUNT comparator trip point R1 INA193A INA193A­ INA198A INA198A TLV3012 TLV3012 R2 REF 1.25V Internal Reference (a) INA19xA Output Adjusted by Voltage Divider VIN+ VIN­ V+ 5 k 5 k OUT INA193A INA193A­ INA198A INA198A TLV3012 TLV3012 R1 R2 REF 1.25V Internal Reference For use with small output signals. (b) Comparator Reference Voltage Adjusted by Voltage Divider Figure 10. INA19xA With Comparator Copyright © 2006­2008, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): INA193A-Q1 INA193A-Q1 INA194A-Q1 INA194A-Q1 INA195A-Q1 INA195A-Q1 INA196A-Q1 INA196A-Q1 INA197A-Q1 INA197A-Q1 INA198A-Q1 INA198A-Q1 17 PACKAGE OPTION ADDENDUM www.ti.com 10-Oct-2008 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty INA193AQDBVRQ1 INA193AQDBVRQ1 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR INA194AQDBVRQ1 INA194AQDBVRQ1 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR INA195AQDBVRQ1 INA195AQDBVRQ1 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR INA196AQDBVRQ1 INA196AQDBVRQ1 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR INA197AQDBVRQ1 INA197AQDBVRQ1 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR INA198AQDBVRQ1 INA198AQDBVRQ1 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Lead/Ball Finish MSL Peak Temp (3) (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. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. 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. 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