INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 CURRENT SHUNT MONITORS –16 V to +80 V Common Mode Range • FEATURES • • • • • • • • • (1) Controlled Baseline – One Assembly/Test Site, One Fabrication Site Extended Temperature Performance of –55°C to 125°C Enhanced Diminishing Manufacturing Sources (DMS) Support Enhanced Product-Change Notification Qualification Pedigree (1) Wide Common-Mode Voltage: –16 V to +80 V Low Error: 3.0% Over Temp (Max) Bandwidth: Up to 500 kHz Three Transfer Functions Available: 20 V/V, 50 V/V, and 100 V/V Complete Current Sense Solution APPLICATIONS • • • • • • • Welding Equipment Notebook Computers Cell Phones Telecom Equipment Automotive Power Management Battery Chargers xxx xxx Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits. INA196 INA197 INA198 DBV PACKAGE INA193 INA194 INA195 DBV PACKAGE OUT 1 5 V+ OUT 1 5 VIN- GND 2 GND 2 VIN+ 3 4 VINPINOUT 1 4 VIN+ V+ 3 PINOUT 2 DESCRIPTION The INA193A–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 INA19x 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–INA195A provide identical functions but alternative pin configurations to the INA196A–INA198A, respectively. The INA193A–INA198A operate from a single 2.7 V to 18 V supply, drawing a maximum of 1300 µA of supply current. They are specified over the extended operating temperature range (–55°C to 125°C), and are offered in a space-saving SOT23 package. 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. All trademarks are the property of their respective owners. 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, Texas Instruments Incorporated INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 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 TA –55°C to 125°C (1) (2) PACKAGE (1) SOT23-5 – DBV ORDERABLE PART NUMBER TOP-SIDE MARKING INA193AMDBVREP CCC INA194AMDBVREP (2) TBD INA195AMDBVREP (2) TBD INA196AMDBVREP (2) TBD INA197AMDBVREP (2) TBD INA198AMDBVREP (2) TBD For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. Product Preview GAIN PACKAGE PINOUT (1) INA193A 20 V/V SOT23-5 Pinout 1 INA194A 50 V/V SOT23-5 Pinout 1 INA195A 100 V/V SOT23-5 Pinout 1 INA196A 20 V/V SOT23-5 Pinout 2 INA197A 50 V/V SOT23-5 Pinout 2 INA198A 100 V/V SOT23-5 Pinout 2 MODEL (1) See pin assignments for pinout 1 and pinout 2 IS RS VIN+ -16 V to 80 V Negative and Positive Common-Mode Voltage V+ 2.7 V to 18 V VIN+ VIN- R1 R1 Load A1 - + + A2 OUT INA193A-INA198A 2 RL Submit Documentation Feedback INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 Absolute Maximum Ratings (1) over operating free-air temperature range (unless otherwise noted) MIN MAX Supply voltage VIN+ VIN– 18 Analog input voltage range Analog outputt voltage range (2) Differential (VIN+– VIN–) –18 18 Common mode (2) –16 80 GND – 0.3 (V+) + 0.3 OUT Input current into any pin (2) V V 5 mA –55 150 °C Storage temperature range –65 150 °C 150 °C ESD ratings (2) V Operating temperature range Junction temperature (1) UNIT Human-Body Model (HBM) 4000 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. Input voltage at any pin may exceed the voltage shown if the current at that pin is limited to 5 mA. Electrical Characteristics VS = + 12 V. Boldface limits apply over the specified temperature range, TA = –55°C to 125°C. All specifications at TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 0.15 (VS – 0.2)/Gain V 80 V INPUT Full-scale input voltage Common-mode input range Common-mode rejection VSENSE VSENSE = VIN+ – VIN– VCM CMR VIN+ = –16 V to 80 V Over temperature Offset voltage, RTI –16 VIN+ = 12 V to 80 V VOS Over temperature vs temperature vs power supply Input bias current, VIN– pin dVOS/dT 80 94 100 120 dB dB ±0.5 2 0.5 3 IB mV µV/°C 2.5 PSR VS = 2.7 V to 18 V, VIN+ = 18 V mV 5 100 µV/V ±8 ±23 µA OUTPUT (VSENSE ≥ 20 mV) Gain: INA193A, INA196A INA194A, INA197A INA195A, INA198A G VSENSE = 20 mV to 100 mV, TA = 25°C Gain error Over temperature Over temperature Output impedance Maximum capacitive load (1) VSENSE = 20 mV to 100 mV RO No sustained oscillation V/V V/V ±0.2 ±1 % ±2 % ±0.75 ±2.2 % ±1 ±3 % ±0.002 ±0.1 % VSENSE = 20 mV to 100 mV Total output error (1) Nonlinearity error V/V 20 50 100 1.5 Ω 10 nF Total output error includes effects of gain error and VOS. Submit Documentation Feedback 3 INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 Electrical Characteristics (continued) VS = + 12 V. Boldface limits apply over the specified temperature range, TA = –55°C to 125°C. All specifications at TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OUTPUT (VSENSE < 20 mV) (2) All devices –16 V ≤ VCM < 0 V INA193A, INA196A 0 V ≤ VCM ≤ VS, VS = 5 V 0.4 V INA194A, INA197A 0 V ≤ VCM ≤ VS, VS = 5 V 1 V INA195A, INA198A 0 V ≤ VCM ≤ VS, VS = 5 V 2 V All devices VS < VCM ≤ 80 V VOLTAGE OUTPUT (3) RL = 100 KΩ to GND 300 300 Swing to V+ power-supply rail Swing to mV GND (4) mV (V+) – 0.1 (V+) – 0.2 V VGND + 3 VGND + 50 mV FREQUENCY RESPONSE Bandwidth INA193A, INA196A, BW CLOAD = 5 pF 500 kHz INA194A, INA197A, CLOAD = 5 pF 300 kHz INA195A, INA198A CLOAD = 5 pF 200 kHz CLOAD < 10 nF 40 Degrees 1 V/µs 2 µs 40 nV/√Hz Phase margin Slew rate Settling time (1%) SR tS VSENSE = 10 mV to 100 mVPP, CLOAD = 5 pF NOISE, RTI Voltage noise density POWER SUPPLY Operating range Quiescent Current VS 2.7 IQ VOUT = 2 V VSENSE = 0 mV 18 V 700 1300 µA 370 950 µA TEMPERATURE RANGE Specified temperature range –55 125 °C Operating temperature range –55 150 °C Storage temperature range –65 150 Thermal resistance, SOT23 (2) (3) (4) 4 θJA 200 °C °C/W For details on this region of operation, see the Accuracy Variations as a Result of VSENSE and Common-Mode Voltage section in the Applications Information. See Typical Characteristic curve Output Swing vs Output Current. Specified by design Submit Documentation Feedback INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 TYPICAL CHARACTERISTICS All specifications at TA = 25°C, VS = 12 V, and 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 = 1000pF G = 100 G = 20 25 20 30 20 15 15 10 10 5 G = 20 25 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 0 120 CMR 110 100 90 PSR 80 70 60 50 40 20 100 200 300 400 500 600 700 800 900 10 100 1k VDIFFERENTIAL (mV) 10k 100k 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 50 100 150 200 250 300 350 400 450 500 0 −16 −12 −8 −4 VSENSE (mV) 0 4 8 12 16 20 ... 76 80 Common−Mode Voltage (V) Submit Documentation Feedback 5 INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 TYPICAL CHARACTERISTICS (continued) All specifications at TA = 25°C, VS = 12 V, and VIN+ = 12 V, and VSENSE = 100 mV (unless otherwise noted). POSITIVE OUTPUT VOLTAGE SWING vs OUTPUT CURRENT QUIESCENT CURRENT vs OUTPUT VOLTAGE 1000 12 900 VS = 12V 10 9 800 Sourcing Current +25_ C 8 700 −40_ C +125_ C 7 6 IQ (µA) Output Voltage (V ) 11 VS = 3V 5 Sourcing Current +25_ C 4 −40_ C 2 1 +125_ C 0 0 500 400 300 Output stage is designed to source current. Current sinking capability is approximately 400µA. 3 600 200 100 0 5 10 20 15 25 30 0 1 2 Output Current (mA) VS = 2.7V IQ (µA) 675 575 475 VS = 12V VS = 2.7V 275 Output Short−Circuit Current (mA) VS = 12V VSENSE = 0mV: 8 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 VCM (V) 4.5 5.5 6.5 7.5 8.5 STEP RESPONSE G = 20 Output Voltage (50mV/div) Output Voltage (500mV/div) G = 20 VSENSE = 10mV to 20mV 9.5 10.5 11.5 17 Supply Voltage (V) STEP RESPONSE VSENSE = 10mV to 100mV Time (2µs/div) Time (2µs/div) 6 7 6 34 VSENSE = 100mV: 175 −16 −12 −8 −4 5 OUTPUT SHORT-CIRCUIT CURRENT vs SUPPLY VOLTAGE 775 375 4 Output Voltage (V) QUIESCENT CURRENT vs COMMON-MODE VOLTAGE 875 3 Submit Documentation Feedback 18 INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 TYPICAL CHARACTERISTICS (continued) All specifications at TA = 25°C, VS = 12 V, and VIN+ = 12 V, and VSENSE = 100 mV (unless otherwise noted). STEP RESPONSE STEP RESPONSE G = 50 Output Voltage (50mV/div) Output Voltage (100mV/div) G = 20 VSENSE = 90mV to 100mV VSENSE = 10mV to 20mV Time (2µs/div) Time (5µs/div) STEP RESPONSE STEP RESPONSE G = 50 Output Voltage (1V/div) Output Voltage (100mV/div) G = 50 VSENSE = 10mV to 100mV VSENSE = 90mV to 100mV Time (5µs/div) Time (5µs/div) STEP RESPONSE Output Voltage (2V/div) G = 100 VSENSE = 10mV to 100mV Time (10µs/div) Submit Documentation Feedback 7 INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 APPLICATION INFORMATION Basic Connection Figure 1 shows the basic connection of the INA193A–INA198A. 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+ VIN- R1 R2 Load OUT INA193A-INA198A RL Figure 1. INA193A–INA198A Basic Connection Power Supply The input circuitry of the INA193A–INA198A 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–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 INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 APPLICATION INFORMATION (continued) 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) + ǒV G Ǔ * 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–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–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 and INA198A (Gain = 100). Submit Documentation Feedback 9 INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 APPLICATION INFORMATION (continued) 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, 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–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. 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, 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 VSENSE (mV) NOTE: (1) INA193, INA196 VOUT Tested Limit = 0.4V. INA194, INA197 VOUT Tested Limit = 1V. Figure 3. Example for Low VSENSE Case 2 (INA195A, INA198A: Gain = 100) 10 Submit Documentation Feedback 24 INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 APPLICATION INFORMATION (continued) Shutdown Because the INA193A–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–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 Figure 4. INA193A–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 INA193A–INA198A 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 INA193A–INA198A is exposed to transients on the inputs in excess of its ratings, then external transient absorption with semiconductor transient absorbers (zeners or Transzorbs) will be 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 will never allow the INA193A–INA198A 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 INA193A–INA198A 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 INA193A–INA198A inputs with two equal resistors on each input.) Submit Documentation Feedback 11 INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 APPLICATION INFORMATION (continued) Output Voltage Range The output of the INA193A–INA198A is accurate within the output voltage swing range set by the power-supply pin, V+. This is best illustrated when using the INA195A or 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–INA195A versus the INA196A–INA198A may provide different EMI performance. Input Filtering An obvious and straightforward location for filtering is at the output of the INA193A–INA198A; 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 INA193A–INA198A, which is complicated by the internal 5 kΩ + 30% input impedance; this is illustrated in 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: ǒ GainError% + 100 * 100 Ǔ 5k W 5k W ) RFILT (3) Total effect on gain error can be calculated by replacing the 5-kΩ term with 5 kΩ – 30%, (or 3.5 kΩ) or 5 kΩ + 30% (or 6.5 kΩ). The tolerance extremes of RFILT can also be inserted into the equation. If a pair of 100-Ω 1% resistors are used on the inputs, the initial gain error will be approximately 2%. Worst-case tolerance conditions will always occur at the lower excursion of the internal 5 kΩ resistor (3.5 kΩ), and the higher excursion of RFILT – 3% in this case. Note that the specified accuracy of the INA193A–INA198A must then be combined in addition to these tolerances. While this discussion treated 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 INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 APPLICATION INFORMATION (continued) RSHUNT << RFILTER LOAD VSUPPLY RFILT < 100 W RFILT < 100 W CFILT f-3dB f-3dB = 1 2p (2 RFILT) CFILT +5 V VIN+ R1 5 kW VIN- V+ R1 5 kW OUT RL INA193A-INA198A Figure 5. Input Filter (Gain Error – 15% to –2.2%) Inside the INA193A–INA198A The INA193A–INA198A uses a new, unique internal circuit topology that provides common-mode range extending from –16 V to 80 V while operating from a single power supply. The common-mode rejection in a classic instrumentation amp approach is limited by the requirement for accurate resistor matching. By converting the induced input voltage to a current, the INA193A–INA198A provides common-mode rejection that is no longer a function of closely matched resistor values, providing the enhanced performance necessary for such a wide common-mode range. A simplified diagram (shown in Figure 6) shows the basic circuit function. When the common-mode voltage is positive, amplifier A2 is active. The differential input voltage, (VIN+) – (VIN–) applied across RS, is converted to a current through a resistor. This current is converted back to a voltage through RL, and then amplified by the output buffer amplifier. When the common-mode voltage is negative, amplifier A1 is active. The differential input voltage, (VIN+) – (VIN–) applied across RS, is converted to a current through a resistor. This current is sourced from a precision current mirror whose output is directed into RL converting the signal back into a voltage and amplified by the output buffer amplifier. Patent-pending circuit architecture ensures smooth device operation, even during the transition period where both amplifiers A1 and A2 are active. Submit Documentation Feedback 13 INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 APPLICATION INFORMATION (continued) Negative and Positive Common-Mode Voltage IS RS VIN+ V+ VIN+ VIN(1) Load (1) R1 5 kW R1 5 kW A1 A2 NOTE: (1) Nominal resistor values are shown. ±15% variation is possible. Resistor ratios are matched to ±1%. G = 20, RL = 100 kW G = 50, RL = 250 kW G = 100, RL = 500 kW INA193A-INA198A OUT (1) RL Figure 6. INA193A–INA198A Simplified Circuit Diagram 14 Submit Documentation Feedback INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 APPLICATION INFORMATION (continued) RSHUNT LOAD –12 V I1 5V VIN+ VIN- V+ V+ OUT for 12-V Common-Mode INA193A-INA198A GND OUT for -12 V Common-Mode INA193A-INA198A VIN+ VIN- GND RSHUNT –12 V LOAD I2 Figure 7. Monitor Bipolar Output Power-Supply Current Submit Documentation Feedback 15 INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 APPLICATION INFORMATION (continued) RSHUNT LOAD VSUPPLY 5V VIN+ VIN- 5V VIN+ V+ VIN- V+ 5V INA152A 40 kW OUT INA193A-INA198A 40 kW OUT VOUT INA193A-INA198A 40 kW 40 kW Figure 8. Bidirectional Current Monitoring Up to 80 V RSHUNT Solenoid VIN+ 2.7 V to 18 V VINV+ OUT INA193A-INA198A Figure 9. Inductive Current Monitor Including Flyback 16 Submit Documentation Feedback 2.5 V VREF INA193A-EP,, INA194A-EP,, INA195A-EP INA196A-EP, INA197A-EP, INA198A-EP www.ti.com SBOS400 – MAY 2007 APPLICATION INFORMATION (continued) VIN+ VIN- V+ For output signals > comparator trip-point. R1 OUT TLV3012 INA193A-INA198A R2 1.25-V Internal Reference (a) INA193A-INA198A output adjusted by voltage divider VIN+ VIN- REF V+ OUT TLV3012 INA193A-INA198A R1 (b) Comparator reference voltage adjusted by voltage divider R2 REF 1.25-V Internal Reference For use with small output signals Figure 10. INA193A–INA198A With Comparator Submit Documentation Feedback 17 PACKAGE OPTION ADDENDUM www.ti.com 6-Jun-2012 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) INA193AMDBVREP ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) Call TI Level-2-260C-1 YEAR INA193AMDBVREPG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) Call TI Level-2-260C-1 YEAR V62/07638-01XE ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) Call TI Level-2-260C-1 YEAR (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. 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