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INA207AIDG4

INA207AIDG4

  • 厂商:

    BURR-BROWN(德州仪器)

  • 封装:

    SOIC14_150MIL

  • 描述:

    IC CURRENT MONITOR 3.5% 14SOIC

  • 数据手册
  • 价格&库存
INA207AIDG4 数据手册
Product Folder Sample & Buy Support & Community Tools & Software Technical Documents INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 INA20x Unidirectional Measurement Current-Shunt Monitor With Dual Comparators 1 Features 3 Description • • The INA206, INA207, and INA208 are a family of undirectional current-shunt monitors with voltage output, dual comparators, and voltage reference. The INA206, INA207, and INA208 can sense drops across shunts at a common-mode voltages from –16 V to 80 V. The INA206, INA207, and INA208 are available with three output voltage scales: 20 V/V, 50 V/V, and 100 V/V, with up to 500-kHz bandwidth. 1 • • • • • • Complete Current Sense Solution Three Gain Options Available: – INA206 = 20 V/V – INA207 = 50 V/V – INA208 = 100 V/V Dual Comparators: – Comparator 1 With Latch – Comparator 2 With Optional Delay Common-mode Range: –16 V to 80 V High Accuracy: 3.5% (Maximum) Over Temperature Bandwidth: 500 kHz Quiescent Current: 1.8 mA Packages: SO-14, TSSOP-14, VSSOP-10 The INA206, INA207, and INA208 also incorporates two open-drain comparators with internal 0.6-V references. On 14-pin versions, the comparator references can be overridden by external inputs. Comparator 1 includes a latching capability, and Comparator 2 has a user-programmable delay on 14pin versions. The 14-pin versions also provide a 1.2 V reference output. The INA206, INA207, and INA208 operate from a single 2.7-V to 18-V supply. They are specified over the extended operating temperature range of –40°C to 125°C. 2 Applications • • • • • • • Notebook Computers Cell Phones Telecom Equipment Automotive Power Management Battery Chargers Welding Equipment Device Information PART NUMBER INA206 INA207 INA208 PACKAGE (1) BODY SIZE (NOM) SOIC (14) 8.65 mm × 3.91 mm TSSOP (14) 5.00 mm × 4.40 mm VSSOP (10) 3.00 mm × 3.00 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Schematic INA206- INA208 VS 1 OUT 2 1.2V REF 14 VIN+ 13 VIN- 12 1.2V REF OUT CMP1 IN- /0.6V REF 3 CMP1 IN+ 4 11 CMP1 OUT CMP2 IN- 5 10 CMP2 OUT CMP2 IN+/0.6V REF 6 9 CMP2 DELAY GND 7 8 CMP1 RESET SO-14, TSSOP-14 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com Table of Contents 1 2 3 4 5 6 7 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Device Comparison Table..................................... Pin Configuration and Functions ......................... Specifications......................................................... 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8 1 1 1 2 3 3 5 Absolute Maximum Ratings ...................................... 5 ESD Ratings.............................................................. 5 Recommended Operating Conditions....................... 5 Thermal Information ................................................. 5 Electrical Characteristics: Current-Shunt Monitor ..... 6 Electrical Characteristics: Comparator...................... 7 Electrical Characteristics: Reference ........................ 8 Electrical Characteristics: General ............................ 8 Typical Characteristics ............................................ 10 Detailed Description ............................................ 15 8.1 Overview ................................................................. 15 8.2 Functional Block Diagram ....................................... 15 8.3 Feature Description................................................. 15 8.4 Device Functional Modes........................................ 19 9 Application and Implementation ........................ 22 9.1 Application Information............................................ 22 9.2 Typical Application ................................................. 22 10 Power Supply Recommendations ..................... 25 11 Layout................................................................... 26 11.1 Layout Guidelines ................................................. 26 11.2 Layout Example .................................................... 26 12 Device and Documentation Support ................. 27 12.1 12.2 12.3 12.4 12.5 Related Links ........................................................ Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 27 27 27 27 27 13 Mechanical, Packaging, and Orderable Information ........................................................... 27 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision E (October 2007) to Revision F • 2 Page ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section ................................................................................................. 1 Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 INA206, INA207, INA208 www.ti.com SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 5 Device Comparison Table DEVICE GAIN INA206 20 V/V INA207 50 V/V INA208 100 V/V 6 Pin Configuration and Functions D or PW Packages 14-Pin SOIC OR TSSOP Top View INA206- INA208 VS 1 OUT 2 1.2V REF 14 VIN+ 13 VIN- 12 1.2V REF OUT CMP1 IN- /0.6V REF 3 CMP1 IN+ 4 11 CMP1 OUT CMP2 IN- 5 10 CMP2 OUT CMP2 IN+/0.6V REF 6 9 CMP2 DELAY GND 7 8 CMP1 RESET SO-14, TSSOP-14 Pin Functions: SOIC and TSSOP PIN NO. NAME I/O DESCRIPTION 1 Vs I Power Supply 2 OUT O Output voltage 3 CMP1 IN/0.6V Ref I Comparator 1 negative input, can be used to override the internal 0.6-V reference 4 CMP1 IN+ I Comparator 1 positive input 5 CMP2 IN- I Comparator 2 negative input 6 CMP2 IN+/0.6V Ref I Comparator 2 positive input, can be used to override the internal 0.6-V reference 7 GND I Ground 8 CMP1 RESET I Comparator 1 ouput reset, active low 9 CMP2 DELAY I Connect an optional capacitor to adjust comparator 2 delay 10 CMP2 OUT O Comparator 2 output 11 CMP1 OUT O Comparator 1 output 12 1.2V REF OUT O 1.2-V reference output 13 VIN- I Connect to shunt low side 14 VIN+ I Connect to shunt high side Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 Submit Documentation Feedback 3 INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com DGS Package 10-Pin VSSOP Top View INA206- INA208 VS 1 10 VIN+ OUT 2 9 VIN- CMP1 IN+ 3 8 CMP1 OUT CMP2 IN- 4 7 CMP2 OUT GND 5 6 CMP1 RESET 0.6V REF MSOP-10 Pin Functions: VSSOP PIN NO. NAME I/O DESCRIPTION 1 Vs I Power Supply 2 OUT O Output voltage 3 CMP1 IN+ I Comparator 1 positive input 4 CMP2 IN- I Comparator 2 negative input 5 GND I Ground 6 CMP1 RESET I Comparator 1 ouput reset, active low 7 CMP2 OUT O Comparator 2 output 8 CMP1 OUT O Comparator 1 output 9 VIN- I Connect to shunt low side 10 VIN+ I Connect to shunt high side 4 Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 INA206, INA207, INA208 www.ti.com SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 7 Specifications 7.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1) MIN MAX UNIT 18 V Supply voltage, Vs Differential (VIN+) – (VIN–) –18 18 V Common-Mode –16 80 V Comparator analog input and reset pins GND – 0.3 (Vs) + 0.3 V Analog output, out pin GND – 0.3 (Vs) + 0.3 V Comparator output, out pin GND – 0.3 18 V VREF and CMP2 delay pin GND – 0.3 10 V 5 mA Operating temperature –55 150 °C Junction temperature –65 150 °C Storage temperature, Tstg –65 150 °C Current-shunt monitor analog inputs, VIN+ and VIN– Input current into any pin (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 7.2 ESD Ratings VALUE V(ESD) (1) (2) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) ±4000 Charged device model (CDM), per JEDEC specification JESD22-C101 (2) ±500 UNIT V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. 7.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) MIN NOM MAX Vcm Common-mode input voltage –16 12 80 UNIT V Vs Operating supply voltage 2.7 12 18 V TA Operating free-air temperature –40 25 125 ºC 7.4 Thermal Information INA20x THERMAL METRIC (1) D (SOIC) DGS (VSSOP) PW (TSSOP) 14 PINS 10 PINS 14 PINS UNIT 84.9 161.3 112.6 °C/W 44 36.8 37.2 °C/W RθJA Junction-to-ambient thermal resistance RθJC(top) Junction-to-case (top) thermal resistance RθJB Junction-to-board thermal resistance 39.4 82.3 55.4 °C/W ψJT Junction-to-top characterization parameter 10.3 1.3 2.7 °C/W ψJB Junction-to-board characterization parameter 39.1 80.8 54.7 °C/W RθJC(bot) Junction-to-case (bottom) thermal resistance 150 200 150 °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953. Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 Submit Documentation Feedback 5 INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com 7.5 Electrical Characteristics: Current-Shunt Monitor At TA = 25°C, VS = 12 V, VIN+ = 12 V, VSENSE = 100 mV, RL = 10 kΩ to GND, RPULL-UP = 5.1 kΩ each connected from CMP1 OUT and CMP2 OUT to VS, and CMP1 IN+ = 1 V and CMP2 IN– = GND, unless otherwise noted. PARAMETERS TEST CONDITIONS MIN TYP MAX UNIT 0.15 (VS –0.25)/Gain V 80 V INPUT VSENSE Full-scale sense input voltage VSENSE = VIN+ – VIN– VCM Common-mode input range TA = –40°C to 125°C –16 Common-mode rejection ratio VIN+ = –16 V to 80 V 80 Common-mode rejection ratio over temperature VIN+ = 12 V to 80 V, TA = –40°C to 125°C CMRR 100 TA = 25°C VOS (1) Offset voltage RTI 100 dB 123 ±0.5 dB ±2.5 TA = 25°C to 125°C ±3 TA = –40°C to 25°C ±3.5 mV dVOS/dT Offset voltage RTI vs temperature TA = –40°C to 125°C PSR Offset voltage RTI vs power supply VOUT = 2 V, VIN+ = 18 V, 2.7 V, TA = –40°C to 125°C 2.5 100 µV/V IB Input bias current, VIN– Pin TA = –40°C to 125°C ±9 ±16 µA INA206 20 5 µV/°C OUTPUT (VSENSE ≥ 20 mV) G Gain Gain error Nonlinearity error 100 ±0.2% VSENSE = 20 mV to 100 mV, TA = –40°C to 125°C (2) (3) V/V ±1% ±2% VSENSE = 120 mV, VS = 16 V Total output error over temperature RO 50 INA208 VSENSE = 20 mV to 100 mV Gain error over temperature Total output error INA207 ±0.75% VSENSE = 120 mV, VS = 16 V, TA = –40°C to 125°C ±2.2% ±3.5% VSENSE = 20 mV to 100 mV ±0.002% Output impedance 1.5 Ω Maximum capacitive load No Sustained Oscillation 10 nF OUTPUT (VSENSE < 20 mV) (4) INA206 INA207 300 –16 V ≤ VCM < 0 V 300 INA208 INA206 Output voltage INA207 0.4 0 V ≤ VCM ≤ VS, VS = 5 V 1 INA208 V 2 INA206 INA207 mV 300 300 VS < VCM ≤ 80 V 300 INA208 mV 300 VOLTAGE OUTPUT Output swing to the positive rail Output swing to GND (1) (2) (3) (4) (5) 6 (5) VIN– = 11 V, VIN+ = 12 V, TA = –40°C to 125°C (Vs) – 0.15 (Vs) – 0.25 V VIN– = 0 V, VIN+ = –0.5 V, TA = –40°C to 125°C (VGND) + 0.004 (VGND) + 0.05 V Offset is extrapolated from measurements of the output at 20 mV and 100 mV VSENSE. Total output error includes effects of gain error and VOS. Linearity is best fit to a straight line. For details on this region of operation, see the Accuracy Variations as a Result of VSENSE and Common-Mode Voltage section. Specified by design. Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 INA206, INA207, INA208 www.ti.com SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 Electrical Characteristics: Current-Shunt Monitor (continued) At TA = 25°C, VS = 12 V, VIN+ = 12 V, VSENSE = 100 mV, RL = 10 kΩ to GND, RPULL-UP = 5.1 kΩ each connected from CMP1 OUT and CMP2 OUT to VS, and CMP1 IN+ = 1 V and CMP2 IN– = GND, unless otherwise noted. PARAMETERS TEST CONDITIONS MIN TYP MAX UNIT FREQUENCY RESPONSE INA206 Bandwidth 500 INA207 CLOAD = 5 pF 300 INA208 Phase margin CLOAD < 10 pF Slew rate Settling time (1%) kHz 200 VSENSE = 10 mVPP to 100 mVPP, CLOAD = 5 pF 40 ° 1 V/µs 2 µs 40 nV/√Hz NOISE, RTI Output voltage noise density 7.6 Electrical Characteristics: Comparator At TA = 25°C, VS = 12 V, VIN+ = 12 V, VSENSE = 100 mV, RL = 10 kΩ to GND, RPULL-UP = 5.1 kΩ each connected from CMP1 OUT and CMP2 OUT to VS, unless otherwise noted. PARAMETERS TEST CONDITIONS MIN TYP MAX UNIT OFFSET VOLTAGE Offset Voltage Comparator Common-Mode Voltage = Threshold Voltage, Figure 1 Offset Voltage Drift, Comparator 1 TA = –40°C to 125°C Offset Voltage Drift, Comparator 2 TA = –40°C to 125°C Threshold TA = 25°C 590 Threshold over Temperature TA = –40°C to 125°C 586 2 mV ±2 µV/°C 5.4 608 µV/°C 620 mV 625 mV Hysteresis (1) , CMP1 TA = –40°C to 85C –8 mV Hysteresis (1) , CMP2 TA = –40°C to 85°C 8 mV INPUT BIAS CURRENT (2) CMP1 IN+, CMP2 IN– CMP1 IN+, CMP2 IN– vs Temperature 0.005 TA = –40°C to 125°C 10 nA 15 nA INPUT IMPEDANCE Pins 3 and 6 (14-pin packages only) 10 kΩ CMP1 IN+ and CMP2 IN– 0 V to VS – 1.5V V Pins 3 and 6 (14-pin packages only) (3) 0 V to VS – 1.5V V INPUT RANGE OUTPUT Large-signal differential voltage gain CMP VOUT 1 V to 4 V, RL ≥ 15 kΩ connected to 5 V High-level output current VID = 0.4 V, VOH = VS Low-level output voltage 200 V/mV 0.0001 1 µA VID = –0.6 V, IOL = 2.35 mA 220 300 mV Comparator 1 RL to 5 V, CL = 15 pF, 100-mV Input Step with 5-mV Overdrive 1.3 µs Comparator 2 RL to 5 V, CL = 15 pF, 100-mV Input Step with 5-mV Overdrive, CDELAY Pin Open 1.3 µs RESPONSE TIME (3) RESET RESET Threshold (4) 1.1 Logic Input Impedance Minimum RESET Pulse Width RESET Propagation Delay (1) (2) (3) (4) V 2 mΩ 1.5 µs 3 µs Hysteresis refers to the threshold (the threshold specification applies to a rising edge of a noninverting input) of a falling edge on the noninverting input of the comparator. See Figure 1. Specified by design. The comparator response time specified is the interval between the input step function and the instant when the output crosses 1.4 V. RESET input has an internal 2 MΩ (typical) pull-down. Leaving RESET open results in a LOW state, with transparent comparator operation. Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 Submit Documentation Feedback 7 INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com Electrical Characteristics: Comparator (continued) At TA = 25°C, VS = 12 V, VIN+ = 12 V, VSENSE = 100 mV, RL = 10 kΩ to GND, RPULL-UP = 5.1 kΩ each connected from CMP1 OUT and CMP2 OUT to VS, unless otherwise noted. PARAMETERS Comparator 2 Delay Equation TEST CONDITIONS Comparator 2 Delay, tD (5) MIN (5) TYP MAX CDELAY = tD/5 CDELAY = 0.1 μF UNIT µF 0.5 s The Comparator 2 delay applies to both rising and falling edges of the comparator output. 7.7 Electrical Characteristics: Reference At TA = 25°C, VS = 12 V, VIN+ = 12 V, VSENSE = 100 mV, RL = 10 kΩ to GND, RPULL-UP = 5.1 kΩ each connected from CMP1 OUT and CMP2 OUT to VS, unless otherwise noted. PARAMETERS TEST CONDITIONS MIN TYP MAX 1.188 1.2 1.212 40 100 UNIT REFERENCE VOLTAGE 1.2VREFOUT Output Voltage dVOUT/dT Reference Drift TA = –40°C to 85°C 0.6VREF Output Voltage (Pins 3 and 6 of 14-pin packages only) dVOUT/dT Reference Drift dVOUT/dILOA LOAD REGULATION 0.6 V ppm/°C V TA = –40°C to 85°C 40 100 ppm/°C Sourcing 0 mA < ISOURCE < 0.5 mA 0.4 2 mV/mA Sinking 0 mA < ISINK < 0.5 mA 0.4 ILOAD LOAD CURRENT TA = –40°C to 125°C dVOUT/dVS LINE REGULATION D mV/mA 1 mA 2.7 V < VS < 18 V, TA = –40°C to 125°C 30 µV/V No Sustained Oscillations 10 nF 10 kΩ CAPACITIVE LOAD Reference Output Maximum Capacitive Load OUTPUT IMPEDANCE Pins 3 and 6 of 14-Pin Packages Only 7.8 Electrical Characteristics: General At TA = 25°C, VS = 12 V, VIN+ = 12 V, VSENSE = 100 mV, RL = 10 kΩ to GND, RPULL-UP = 5.1 kΩ each connected from CMP1 OUT and CMP2 OUT to VS, and CMP1 IN+ = 1 V and CMP2 IN– = GND, unless otherwise noted. PARAMETERS TEST CONDITIONS MIN TYP MAX UNIT 18 V 1.8 2.2 mA 2.8 mA POWER SUPPLY VS IQ Operating Power Supply TA = –40°C to 125°C Quiescent Current VOUT = 2 V Quiescent Current over Temperature VSENSE = 0 mV, TA = –40°C to 125°C 2.7 Comparator Power-On Reset Threshold (1) 1.5 V TEMPERATURE θJA (1) 8 Specified Temperature Range –40 125 °C Operating Temperature Range –55 150 °C Storage Temperature Range –65 150 °C Thermal Resistance MSOP-10 Surface-Mount 200 °C/W SO-14, TSSOP-14 Surface-Mount 150 °C/W The INA206, INA207, and INA208 are designed to power-up with the comparator in a defined reset state as long as CMP1 RESET is open or grounded. The comparator will be in reset as long as the power supply is below the voltage shown here. The comparator will assume a state based on the comparator input above this supply voltage. If CMP1 RESET is high at power-up, the comparator output comes up high and requires a reset to assume a low state, if appropriate. Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 INA206, INA207, INA208 www.ti.com SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 VTHRESHOLD 0.592 VTHRESHOLD 0.6 0.6 0.608 Input Voltage Input Voltage Hysteresis = VTHRESHOLD - 8mV Hysteresis = VTHRESHOLD - 8mV a) CMP1 b) CMP2 Figure 1. Comparator Hysteresis Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 Submit Documentation Feedback 9 INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com 7.9 Typical Characteristics All specifications at TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV, unless otherwise noted. 45 45 40 G=50 35 Gain (dB) 30 G=20 25 20 30 G=20 25 20 15 15 10 10 5 10k 5 10k 1M 100k 100k Frequency (Hz) Figure 2. Gain vs Frequency Figure 3. Gain vs Frequency 140 18 130 Common-- Mode and Power--Supply Rejection (dB) 100V/V 16 14 50V/V 12 10 8 20V/V 6 4 120 CMRR 110 100 90 PSR 80 70 60 50 2 40 0 20 100 200 300 400 500 600 700 800 10 900 100 Figure 5. Common-Mode and Power-Supply Rejection vs Frequency Figure 4. Gain Plot 4.0 0.1 3.5 0.09 0.08 3.0 Output Error (% ) Output Error (% error of the ideal output value) 100k 10k 1k Frequency (Hz) VSENSE (mV) 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 0 50 100 150 200 250 300 350 400 450 500 –16 –12 –8 –4 VSENSE (mV) Submit Documentation Feedback 0 4 8 12 16 20 ... 76 80 Common--Mode Voltage (V) Figure 6. Output Error vs VSENSE 10 1M Frequency (Hz) 20 VOUT (V) G = 100 40 G = 50 35 Gain (dB) CLOAD = 1000pF G = 100 Figure 7. Output Error vs Common-Mode Voltage Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 INA206, INA207, INA208 www.ti.com SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 Typical Characteristics (continued) All specifications at TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV, unless otherwise noted. 3.5 11 10 9 8 7 VS = 12V Sourcing Current 3.0 2.5 +25°C –40°C +125°C 6 5 IQ (mA) Output Voltage (V) 12 VS = 3V Sourcing Current 4 –40°C +25°C 3 2 1 0 1.5 1.0 Output stage is designed to source current. Current sinking capabilty is approximately 400 µA. +125°C 0 2.0 0.5 0 5 10 15 20 25 30 0 1 3 2 5 4 7 6 8 9 10 Output Current (mA) Output Voltage (V) Figure 8. Positive Output Voltage Swing vs Output Current Figure 9. Quiescent Current vs Output Voltage 2.50 34 2.25 Output Short--Circuit Current (mA) VSENSE = 100mV VS = 2.7V VS = 12V IQ (mA) 2.00 1.75 VS = 12V 1.50 VS = 2.7V VSENSE = 0mV 1.25 1.00 –40°C 30 +25°C 26 +125°C 22 18 14 10 6 –16 –12 –8 –4 0 4 8 12 16 20 24 28 32 36 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 17 18 VCM (V) Supply Voltage (V) Figure 10. Quiescent Current vs Common-Mode Voltage Figure 11. Output Short-Circuit Current vs Supply Voltage G = 20 Output Voltage (50mV/div) Output Voltage (500mV/div) G = 20 VSENSE = 20mV to 30mV VSENSE = 20mV to 110mV Time (2ms/div) Time (2ms/div) Figure 12. Step Response Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 Figure 13. Step Response Submit Documentation Feedback 11 INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com Typical Characteristics (continued) All specifications at TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV, unless otherwise noted. G = 50 Output Voltage (50mV/div) Output Voltage (100mV/div) G = 20 VSENSE = 20mV to 30mV VSENSE = 90mV to 100mV Time (5ms/div) Time (2µs/div) Figure 15. Step Response Figure 14. Step Response G = 50 Output Voltage (1V/div) Output Voltage (100mV/div) G = 50 VSENSE = 90mV to 100mV VSENSE = 20mV to 110mV Time (5ms/div) Time (5µs/div) Figure 16. Step Response Figure 17. Step Response 600 G = 100 Output Voltage (2V/div) 500 VOL (mV) 400 300 200 100 VSENSE = 20mV to 110mV 0 0 Time (10ms/div) 1 2 3 4 5 6 ISINK (mA) Figure 18. Step Response 12 Submit Documentation Feedback Figure 19. Comparator VOL vs ISINK Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 INA206, INA207, INA208 www.ti.com SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 Typical Characteristics (continued) All specifications at TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV, unless otherwise noted. 602 600 Comparator Trip Point (mV) Comparator Trip Point (mV) 599 598 597 596 595 594 593 592 601 600 599 598 597 591 596 –50 590 6 4 2 8 10 12 14 16 18 –25 0 25 50 75 100 125 Temperature (°C) Supply Voltage (V) Figure 20. Comparator Trip Point vs Supply Voltage Figure 21. Comparator Trip Point vs Temperature 14 200 Propagation Delay (µs) Propagation Delay (ns) 175 150 125 100 13 12 11 75 10 50 20 40 60 80 100 120 140 160 0 180 200 20 40 60 80 100 120 140 160 180 200 Overdrive Voltage (mV) Overdrive Voltage (mV) Figure 22. Comparator 1 Propagation Delay vs Overdrive Voltage Figure 23. Comparator 2 Propagation Delay vs Overdrive Voltage 1.2 300 1.0 275 Propagation Delay (ns) Reset Voltage (V) 0 0.8 0.6 0.4 0.2 250 225 200 175 150 0 2 4 6 8 10 12 14 16 18 125 –50 –25 0 25 50 75 100 125 Supply Voltage (V) Temperature (°C) Figure 24. Comparator Reset Voltage vs Supply Voltage Figure 25. Comparator 1 Propagation Delay vs Temperature Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 Submit Documentation Feedback 13 INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com Typical Characteristics (continued) All specifications at TA = 25°C, VS = 12 V, VIN+ = 12 V, and VSENSE = 100 mV, unless otherwise noted. Propagation Delay (ms) 1000 100 Input 200mV/div 10 1 Output 2V/div 0.1 0.01 0.001 VOD = 5mV 0.01 0.1 10 1 100 2µs/div Delay Capacitance (nF) Figure 27. Comparator 1 Propagation Delay Figure 26. Comparator 2 Propagation Delay vs Capacitance 1.22 Input 200mV/div VREF (V) 1.21 Output 2V/div 1.20 1.19 VOD = 5mV 1.18 –50 5µs/div –25 0 25 50 75 100 125 Temperature (°C) Figure 28. Comparator 2 Propagation Delay 14 Submit Documentation Feedback Figure 29. Reference Voltage vs Temperature Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 INA206, INA207, INA208 www.ti.com SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 8 Detailed Description 8.1 Overview The INA206, INA207, and INA208 are a family of unidirectional current-shunt monitors with voltage output, dual comparators, and voltage reference. The INA206, INA207, and INA208 can sense drops across shunts at common-mode voltages from –16 V to 80 V. The INA206, INA207, and INA208 are available with three output voltage scales: 20 V/V, 50 V/V, and 100 V/V, with up to 500-kHz bandwidth. The INA206, INA207, and INA208 also incorporate two open-drain comparators with internal 0.6-V references. On 14-pin versions, the comparator references can be overridden by external inputs. Comparator 1 includes a latching capability, and Comparator 2 has a user-programmable delay. 14-pin versions also provide a 1.2-V reference output. The INA206, INA207, and INA208 operate from a single 2.7-V to 18-V supply. They are specified over the extended operating temperature range of –40°C to 125°C 8.2 Functional Block Diagram INA206- INA208 VS 1 OUT 2 1.2V REF 14 VIN+ 13 VIN- 12 1.2V REF OUT CMP1 IN- /0.6V REF 3 CMP1 IN+ 4 11 CMP1 OUT CMP2 IN- 5 10 CMP2 OUT CMP2 IN+/0.6V REF 6 9 CMP2 DELAY GND 7 8 CMP1 RESET SO-14, TSSOP-14 8.3 Feature Description 8.3.1 Output Voltage Range The output of the INA206, INA207, and INA208 is accurate within the output voltage swing range set by the power supply pin, Vs. This performance is best illustrated when using the INA208 (a gain of 100 version), 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. 8.3.2 Reference The INA206, INA207, and INA208 include an internal voltage reference that has a load regulation of 0.4 mV/mA (typical), and not more than 100 ppm/°C of drift. Only the 14-pin package allows external access to reference voltages, where voltages of 1.2 V and 0.6 V are both available. Output current versus output voltage is illustrated in Typical Characteristics. 8.3.3 Comparator The INA206, INA207, and INA208 devices incorporate two open-drain comparators. These comparators typically have 2 mV of offset and a 1.3-µs (typical) response time. The output of Comparator 1 latches and is reset through the CMP1 RESET pin, as shown in Figure 31. This configuration applies to both the 10- and 14-pin versions. Figure 30 illustrates the comparator delay. The 14-pin versions of the INA206, INA207, and INA208 include additional features for comparator functions. The comparator reference voltage of both Comparator 1 and Comparator 2 can be overridden by external inputs for increased design flexibility. Comparator 2 has a programmable delay. Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 Submit Documentation Feedback 15 INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com Feature Description (continued) 1.2V I2 120nA U1 U2 I1 120nA 0.6V CDELAY Figure 30. Simplified Model of the Comparator 2 Delay Circuit 0.6V VIN 0V CMP Out RESET Figure 31. Comparator 1 Latching Capability 8.3.4 Comparator Delay (14-Pin Version Only) The Comparator 2 programmable delay is controlled by a capacitor connected to the CMP2 Delay Pin; see Figure 40. The capacitor value (in µF) is selected by using Equation 1. t CDELAY (in mF) = D 5 (1) A simplified version of the delay circuit for Comparator 2 is shown in Figure 30. The delay comparator consists of two comparator stages with the delay between them. Note that I1 and I2 cannot be turned on simultaneously; I1 corresponds to a U1 low output and I2 corresponds to a U1 high output. Using an initial assumption that the U1 output is low, I1 is on, then U2 +IN is zero. If U1 goes high, I2 supplies 120 nA to CDELAY. The voltage at U2 +IN begins to ramp toward a 0.6-V threshold. When the voltage crosses this threshold, the U2 output goes high while the voltage at U2 +IN continues to ramp up to a maximum of 1.2 V when given sufficient time (twice the value of the delay specified for CDELAY). This entire sequence is reversed when the comparator outputs go low, so that returning to low exhibits the same delay. RSHUNT 3mW 12V Supply 12V Load 3.3V Supply VS INA206 x20 OUT CMP1 IN–/0.6 REF CMP1 IN+ 2.5V Reference 1.2V REF VIN+ VIN– 1.2V REF OUT CMP1 OUT CMP2 IN– CMP2 IN+/0.6 REF CMP2 OUT CMP2 DELAY GND CMP1RESET Shutdown Warning CDELAY 0.1µF (0.5s) Figure 32. Server 12-V Supply Current Monitor 16 Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 INA206, INA207, INA208 www.ti.com SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 Feature Description (continued) It is important to note what will happen if events occur more rapidly than the delay timeout; for example, when the U1 output goes high (turning on I2), but returns low (turning I1 back on) prior to reaching the 0.6-V transition for U2. The voltage at U2 +IN ramps back down at a rate determined by the value of CDELAY, and only returns to zero if given sufficient time. In essence, when analyzing Comparator 2 for behavior with events more rapid than its delay setting, use the model shown in Figure 30. 8.3.5 Comparator Maximum Input Voltage Range The maximum voltage at the comparator input for normal operation is up to (Vs) – 1.5 V. There are special considerations when overdriving the reference inputs (pins 3 and 6). Driving either or both inputs high enough to drive 1 mA back into the reference introduces errors into the reference. Figure 33 shows the basic input structure. A general guideline is to limit the voltage on both inputs to a total of 20 V. The exact limit depends on the available voltage and whether either or both inputs are subject to the large voltage. When making this determination, consider the 20 kΩ from each input back to the comparator. Figure 34 shows the maximum input voltage that avoids creating a reference error when driving both inputs (an equivalent resistance back into the reference of 10 kΩ. i £ 1mA 1.2V 20kW 20kW CMP1 IN– CMP2 IN+ Figure 33. Limit Current Into Reference ≤ 1 mA RSHUNT Load Supply –18V to +80V Load 5V Supply VS Current Shunt Monitor Output V < 11.2V INA206 x20 OUT CMP1 IN–/0.6 REF CBYPASS 0.01µF CMP1 IN+ 1.2V REF VIN+ VIN– RPULL-UP 4.7kW RPULL-UP 4.7kW 1.2V REF OUT CMP1 OUT CMP2 IN– CMP2 IN+/0.6 REF CMP2 OUT CMP2 DELAY GND CMP1RESET Optional Delay Capacitor 0.2µF Transparent/Reset Latch Figure 34. Overdriving Comparator Inputs Without Generating a Reference Error Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 Submit Documentation Feedback 17 INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com Feature Description (continued) RSHUNT 3mW Supply Load 5V Supply Q1A, Q1B MMDT2907A VS INA206 x20 OUT R1 1kW 1.2V REF CMP1 IN–/0.6 REF CMP1 IN+ RRAMP 4.99kW VIN+ VIN– 1.2V REF OUT CMP1 OUT CMP2 IN– CMP2 IN+/0.6 REF CMP2 OUT CMP2 DELAY GND CMP1RESET R2 4.02kW RPULL-UP 1kW PWMOUT D1 1N5711 CRAMP 0.27µF D1 1N5711 Figure 35. PWM Output Current-Shunt Monitor RSHUNT Load Load Supply Supply VIN+ 5kW VIN– +5V Supply VS+ 5kW RPULL-UP 1kW A1 VS INA206 x20 OUT CMP1 IN–/0.6 REF A2 1.2V REF CMP1 IN+ OUT RL INA193 VIN+ VIN– 1.2V REF OUT CMP1 OUT CMP2 IN– CMP2 IN+/0.6 REF CMP2 OUT CMP2 DELAY GND CMP1RESET GND Figure 36. Bi-Directional Current Comparator 18 Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 INA206, INA207, INA208 www.ti.com SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 Feature Description (continued) RSHUNT Load Supply +5V Supply VS INA206 x20 OUT R1 R3 1.2V REF CMP1 IN–/0.6 REF CMP1 IN+ R2 R4 VIN+ VIN– 1.2V REF OUT CMP1 OUT Power Good CMP2 IN– CMP2 IN+/0.6 REF CMP2 OUT CMP2 DELAY GND CMP1RESET VUPPER = RPULL-UP 1kW 0.6(R1 + R2) R2 VLOWER = Analog Current Signal 0.6(R3 + R4) R4 Figure 37. Analog Output Current-Shunt Monitor With Comparators Used as Power-Supply Under-Limit or Over-Limit or Power-Good Detector 8.4 Device Functional Modes 8.4.1 Accuracy Variations as a Result of VSENSE and Common-Mode Voltage The accuracy of the INA206, INA207, and INA208 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 8.4.1.1 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 2. - VOUT2 V G =   OUT1 100 mV - 20 mV where • • VOUT1 = Output Voltage with VSENSE = 100 mV VOUT2 = Output Voltage with VSENSE = 20 mV (2) 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 3 æV ö VOSRTI (Re ferred - To - Input) = ç OUT1 ÷ - 100 mV è G ø (3) In the Typical Characteristics, the Output Error vs Common-Mode Voltage curve shows the highest accuracy for 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: Current-Shunt Monitor through Electrical Characteristics: General. Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 Submit Documentation Feedback 19 INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com Device Functional Modes (continued) 8.4.1.2 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 INA206 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 INA206, INA207, or INA208. 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 currenrt-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 Electrical Characteristics: Current-Shunt Monitor through Electrical Characteristics: General. Figure 38 illustrates this effect using the INA208 (Gain = 100). 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 38. Example for Low VSENSE Cases 1 and 3 (INA208, Gain = 100) 8.4.1.3 Low VSENSE Case 2: VSENSE < 20mV, 0V ≤ VCM ≤ VS This region of operation is the least accurate for the INA206 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 o that described by Normal Case 2. Figure 39 illustrates this behavior for the INA208. 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. 20 Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 INA206, INA207, INA208 www.ti.com SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 VOUT (V) Device Functional Modes (continued) 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 (1) INA208 VOUT Tested Limit VCM1 Ideal VCM2 VCM3 VOUT Tested Limit at VSENSE = 0mV, 0 £ VCM1 £ VS. VCM4 VCM2, VCM3, and VCM4 illustrate the variance from part to part of the VCM that can cause maximum VOUT with VSENSE < 20mV. 0 2 4 6 8 10 12 14 16 18 20 22 24 VSENSE (mV) NOTE: (1) INA206 VOUT Tested Limit = 0.4V. INA207 VOUT Tested Limit = 1V. Figure 39. Example for Low VSENSE Case 2 (INA208, Gain = 100) Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 Submit Documentation Feedback 21 INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information 9.1.1 Basic Connection Figure 40 shows the basic connection of the INA206, INA207, and INA208. 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. RSHUNT 3mW Load Supply –18V to +80V Load 5V Supply VS Current Shunt Monitor Output INA206 x20 OUT CMP1 IN–/0.6 REF 1.2V REF CMP1 IN+ CBYPASS 0.01µF VIN+ VIN– RPULL-UP 4.7kW RPULL-UP 4.7kW 1.2V REF OUT CMP1 OUT CMP2 IN– CMP2 IN+/0.6 REF CMP2 OUT CMP2 DELAY GND CMP1RESET Optional Delay Capacitor 0.2µF Transparent/Reset Latch Figure 40. INA20x Basic Connection 9.2 Typical Application RSHUNT Load Supply +5-V Supply VS INA206 x20 OUT R1 R2 R3 R4 CMP1 IN–/0.6 REF CMP1 IN+ 1.2V REF VIN+ VIN– 1.2V REF OUT RPULLUP 1kW CMP1 OUT CMP2 IN– CMP2 IN+/0.6 REF CMP2 OUT CMP2 DELAY GND CMP1RESET VUPPER = VLOWER = 0.6(R1 + R2) R2 0.6(R3 + R4) R4 Figure 41. Using the INA206, INA207, and INA208 as Window Comparators 22 Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 INA206, INA207, INA208 www.ti.com SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 Typical Application (continued) 9.2.1 Design Requirements The device measures current through a resistive shunt with current flowing in one direction. The outputs of the two comparators are in logic AND connection thus enabling the window comparison. When the INA output voltage is within the upper and lower limits, the composite comparator output is high. When the INA output voltage is above the upper limit or below the lower limit, the composite comparator output remains low. 9.2.2 Detailed Design Procedure 9.2.2.1 Selecting RS The value chosen for the shunt resistor, RS, depends on the application and is a compromise between smallsignal 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. 9.2.2.2 Transient Protection The –16-V to 80-V common-mode range of the INA206, INA207, and INA208 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 INA206, INA207, and INA208 are exposed to transients on the inputs in excess of their 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 INA206, INA207, and INA208 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 INA206, INA207, and INA208 do not lend themselves to using external resistors in series with the inputs since the internal gain resistors can vary up to ±30% but are closely matched. (If gain accuracy is not important, then resistors can be added in series with the INA206, INA207, and INA208 inputs with two equal resistors on each input.) 9.2.2.3 Input Filtering An obvious and straightforward location for filtering is at the output of the INA206, INA207, and INA208 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 INA206, INA207, and INA208, which is complicated by the internal 5 kΩ + 30% input impedance; this is shown in Figure 42. 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 Equation 4. æ ö 5 kW Gain Error% = 100 - ç 100 ´ ÷ 5 kW + RFILT ø è (4) 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 1.96%. 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– 2.8% in this case. Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: INA206 INA207 INA208 Submit Documentation Feedback 23 INA206, INA207, INA208 SBOS360F – JUNE 2006 – REVISED NOVEMBER 2015 www.ti.com Typical Application (continued) RSHUNT
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