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AD8202 - AD8202
High Common-Mode Voltage, Single-Supply Difference Amplifier AD8202
High common-mode voltage range supply voltage Operating temperature range: -40°C +125°C Supply voltage range: Low-pass filter (1-pole 2-pole) Excellent performance voltage offset ppm/°C typical gain drift CMRR
AD8202
100k 200k 200k
04981-001
APPLICATIONS
Transmission control Diesel injection control Engine management Adaptive suspension control Vehicle dynamics control
CONNECT
Figure SOIC Package Form
INDUCTIVE LOAD
CLAMP DIODE
OUTPUT
GENERAL DESCRIPTION
AD8202 single-supply difference amplifier amplifying low-pass filtering small differential voltages presence large common-mode voltage (CMV). input range extends from typical supply voltage AD8202 available packaged form. MSOP SOIC packages specified over wide temperature range, from -40°C +125°C, making AD8202 well-suited many automotive platforms. Automotive platforms demand precision components better system control. AD8202 provides excellent performance keeping errors minimum user's system. Typical offset gain drift SOIC package V/°C ppm/°C, respectively. Typical offset gain drift MSOP package V/°C ppm/°C, respectively. device also delivers minimum CMRR from kHz. AD8202 features externally accessible resistor output Preamp that used low-pass filter applications establishing gains other than
BATTERY
4-TERM SHUNT
AD8202
POWER DEVICE
COMMON
CONNECT
Figure High Line Current Sensor
POWER DEVICE OUTPUT
BATTERY
4-TERM SHUNT
AD8202
CLAMP DIODE
INDUCTIVE LOAD
04981-003
COMMON
CONNECT
Figure Line Current Sensor
Rev.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties that result from use. Specifications subject change without notice. license granted implication otherwise under patent patent rights Analog Devices. Trademarks registered trademarks property their respective owners.
Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 2005 Analog Devices, Inc. rights reserved.
04981-002
AD8202 TABLE CONTENTS
Features Applications. General Description Functional Block Diagrams. Specifications. Single Supply Absolute Maximum Ratings. Caution. Configuration Function Descriptions. Typical Performance Characteristics Theory Operation Applications. Current Sensing Gain Adjustment Gain Trim Low-Pass Filtering. High Line Current Sensing with Gain Adjustment Driving Charge Redistribution ADCs. Outline Dimensions Ordering Guide
REVISION HISTORY
11/05-Rev. Rev. Updated Format.Universal Changes Typical Performance Characteristics Added Figure Added Figure Figure Added Figure Added Figure Figure Changes Theory Operation. Added Figure 2/05-Rev. Rev. Changes Table Changes Figure Changes Figure 1/05-Rev. Rev. Changes General Description. Changes Specifications Added Figure Figure Changes Figure Changes Figure Figure Changes Ordering Guide 11/04-Rev. Rev. Changes Features.1 Changes General Description.1 Changes Specifications (Table Changes Absolute Maximum Ratings (Table Changes Function Descriptions (Table Changes Figure Changes Figure Figure 10.6 Updated Outline Dimensions. Changes Ordering Guide 7/04-Revision Initial Version
Rev. Page
AD8202 SPECIFICATIONS
SINGLE SUPPLY
operating temperature range, unless otherwise noted. Table
Parameter SYSTEM GAIN Initial Error Temperature VOLTAGE OFFSET Input Offset (RTI) Temperature INPUT Input Impedance Differential Common Mode CMRR1 Conditions AD8202 SOIC 0.02 VOUT 25°C -0.3 0.15 25°C -40°C +125°C -40°C +150°C +0.3 AD8202 MSOP -0.3 AD8202 +0.3 Unit ppm/°C V/°C V/°C
+0.3
+0.3
Continuous
PREAMPLIFIER Gain Gain Error Output Voltage Range Output Resistance OUTPUT BUFFER Gain Gain Error Output Voltage Range Input Bias Current Output Resistance DYNAMIC RESPONSE System Bandwidth Slew Rate NOISE Spectral Density, (RTI) POWER SUPPLY Operating Range Quiescent Current Temperature PSRR TEMPERATURE RANGE Specified Performance
-0.3 0.02 +0.3 -0.3 0.02
+0.3 -0.3 0.02
+0.3
nV/Hz
0.02 VOUT
-0.3 0.02
+0.3
-0.3 0.02 0.28
+0.3
-0.3 0.02 0.28
+0.3
p-p; VOUT VOUT step
0.28
0.25
0.25
0.25
+125
+125
+150
Source imbalance AD8202 preamplifier exceeds CMRR kHz. However, because signal available only resistor, even small amount pin-topin capacitance between might couple input common-mode signal larger than greatly attenuated preamplifier output. effect pin-to-pin coupling neglected applications using filter capacitors Node
Rev. Page
AD8202 ABSOLUTE MAXIMUM RATINGS
Table
Parameter Supply Voltage Transient Input Voltage (400 Continuous Input Voltage (Common Mode) Reversed Supply Voltage Protection Operating Temperature Range SOIC MSOP Storage Temperature Output Short-Circuit Duration Lead Temperature Range (Soldering, sec) Rating 12.5 -40°C +150°C -40°C +125°C -40°C +125°C -65°C +150°C Indefinite 300°C
Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those indicated operational section this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
CAUTION
(electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although this product features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
Rev. Page
AD8202 CONFIGURATION FUNCTION DESCRIPTIONS
AD8202
CONNECT
Figure Configuration
Table Function Descriptions
Mnemonic -409.0 -244.6 +229.4 +410.0 +410.0 +121.0 -409.0 -205.2 -413.0 -413.0 -308.6 +272.4 +417.0 +205.2
04981-004
VIEW (Not Scale)
1036m
1048m
Figure Metallization Photograph
Rev. Page
04981-005
AD8202 TYPICAL PERFORMANCE CHARACTERISTICS
25°C, unless otherwise noted.
PSRR (dB) COMMON-MODE VOLTAGE
-55°C -40°C +25°C +125°C
04981-009
04981-006
+150°C
FREQUENCY (Hz)
100k
POWER SUPPLY
Figure Power Supply Rejection Ratio Frequency Valid Range
Figure Negative Common-Mode Voltage Voltage Supply
COMMON-MODE VOLTAGE
-55°C +150°C +125°C -40°C +25°C
04981-010
OUTPUT (dB)
04981-007
POWER SUPPLY
FREQUENCY (Hz)
100k
Figure Bandwidth
Figure Positive Common-Mode Voltage Voltage Supply
OUTPUT SWING
04981-008
CMRR (dB)
LOAD RESISTANCE
04981-011
FREQUENCY (Hz)
100k
Figure Common-Mode Rejection Ratio Frequency Valid Common-Mode Range
Figure Output Swing Load Resistance
Rev. Page
AD8202
OUTPUT MINUS SUPPLY (mV)
TEMPERATURE 25°C
LOAD
HITS
LOAD
04981-012
SUPPLY VOLTAGE
CMRR (V/V)
Figure Output Minus Supply Supply Voltage
Figure CMRR Distribution, Common Mode
OUTPUT
HITS
VSUPPLY TEMPERATURE RANGE -40°C +25°C
INPUT
500mV 50mV 2.5MS/s 400NS/PT 1.73V
04981-013
Figure Pulse Response
1000
VSUPPLY TEMPERATURE RANGE 25°C 125°C
HITS
-200 -400 -600 -800 -1000 +125°C COMMON-MODE VOLTAGE
04981-044
-40°C
+25°C
+85°C
04981-036
Figure Common-Mode Voltage
Rev. Page
DRIFT (V/°C)
Figure Offset Drift Distribution, MSOP, Temperature Range -40°C +25°C
DRIFT (V/°C)
Figure Offset Drift Distribution, MSOP, Temperature Range 25°C 125°C
04981-034
04981-043
AD8202
HITS
VSUPPLY TEMPERATURE RANGE 25°C 85°C TEMPERATURE -40°C
HITS
04981-052
-16.0 -14.0 -12.0 -10.0 10.0 12.0 14.0 16.0 -8.0 -6.0 -4.0 -2.0
-2200 -2000 -1800 -1600 -1400 -1200 -1000 -800 -600 -400 -200 1000 1200 1400 1600 1800 2000 2200
DRIFT (V/°C)
Figure Offset Drift Distribution, MSOP, Temperature Range 25°C 85°C
TEMPERATURE 25°C
Figure Distribution, MSOP, Temperature -40°C
TEMPERATURE 25°C
HITS
HITS
04981-037
-2200 -2000 -1800 -1600 -1400 -1200 -1000 -800 -600 -400 -200 1000 1200 1400 1600 1800 2000 2200
Figure Distribution, MSOP, Temperature 25°C
TEMPERATURE 125°C
Figure MSOP Gain Accuracy, Temperature 25°C
HITS
04981-038
HITS
-2200 -2000 -1800 -1600 -1400 -1200 -1000 -800 -600 -400 -200 1000 1200 1400 1600 1800 2000 2200
Figure Distribution, MSOP, Temperature 125°C
Figure MSOP Gain Accuracy, Temperature 125°C
Rev. Page
-0.15 -0.13 -0.11 -0.09 -0.07 -0.05 -0.03 -0.01 0.01 0.03 0.05 0.07 0.09 0.11 0.13 0.15 0.17 0.19 0.21 0.23 0.25 0.27 0.29
ERROR
04981-041
-0.15 -0.13 -0.11 -0.09 -0.07 -0.05 -0.03 -0.01 0.01 0.03 0.05 0.07 0.09 0.11 0.13 0.15 0.17 0.19 0.21 0.23 0.25 0.27 0.29
ERROR TEMPERATURE 125°C
04981-040
04981-039
AD8202
TEMPERATURE -40°C VSUPPLY TEMPERATURE RANGE 25°C 125°C
HITS
HITS
04981-042
-0.15 -0.13 -0.11 -0.09 -0.07 -0.05 -0.03 -0.01 0.01 0.03 0.05 0.07 0.09 0.11 0.13 0.15 0.17 0.19 0.21 0.23 0.25 0.27 0.29
ERROR
GAIN DRIFT (PPM/°C)
Figure MSOP Gain Accuracy, Temperature -40°C
Figure Gain Drift Distribution, MSOP, Temperature Range 25°C 125°C
TEMPERATURE 25°C
VSUPPLY TEMPERATURE RANGE +25°C -40°C
HITS
HITS
04981-048
04981-028
GAIN DRIFT (PPM/°C)
Figure Gain Drift Distribution, MSOP, Temperature Range +25°C -40°C
VSUPPLY TEMPERATURE RANGE 25°C 85°C
Figure Distribution, SOIC, Temperature 25°C
TEMPERATURE 125°C
HITS
HITS
-1500 -1400 -1300 -1200 -1100 -1000 -900 -800 -700 -600 -500 -400 -300 -200 -100 1000 1100 1200 1300 1400 1500
04981-030
04981-049
GAIN DRIFT (PPM/°C)
Figure Gain Drift Distribution, MSOP, Temperature Range 25°C 85°C
Figure Distribution, SOIC, Temperature 125°C
Rev. Page
-1500 -1400 -1300 -1200 -1100 -1000 -900 -800 -700 -600 -500 -400 -300 -200 -100 1000 1100 1200 1300 1400 1500
04981-050
AD8202
TEMPERATURE -40°C VSUPPLY TEMPERATURE RANGE 25°C 125°C
HITS
HITS
04981-029 04981-027
-1500 -1400 -1300 -1200 -1100 -1000 -900 -800 -700 -600 -500 -400 -300 -200 -100 1000 1100 1200 1300 1400 1500
Figure Distribution, SOIC, Temperature -40°C
VSUPPLY TEMPERATURE RANGE -40°C +25°C
TEMPERATURE 25°C
HITS
HITS
04981-025 04981-031
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0
10.0
DRIFT (V/°C)
Figure Offset Drift Distribution, SOIC, Temperature Range -40°C +25°C
VSUPPLY TEMPERATURE RANGE 25°C 85°C
HITS
HITS
04981-051
04981-032
-15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 10.0 11.0 12.0 13.0 14.0 15.0
DRIFT (V/°C)
Figure Offset Drift Distribution, SOIC, Temperature Range 25°C 85°C
Figure Gain Accuracy, SOIC, Temperature 125°C
Rev. Page
0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.30
ERROR
0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.30
ERROR
-2.0 -1.0
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 10.0
DRIFT (V/°C)
Figure Offset Drift Distribution, SOIC, Temperature Range 25°C 125°C
Figure Gain Accuracy, SOIC, Temperature 25°C
TEMPERATURE 125°C
AD8202
TEMPERATURE -40°C VSUPPLY TEMPERATURE RANGE 25°C 85°C
HITS
04981-033
HITS
04981-046
0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.30
ERROR
Figure Gain Accuracy, SOIC, Temperature -40°C
VSUPPLY TEMPERATURE RANGE +25°C -40°C
VSUPPLY TEMPERATURE RANGE 25°C 125°C
HITS
HITS
04981-045
04981-047
GAIN DRIFT (PPM/°C)
Figure Gain Drift Distribution, SOIC, Temperature Range +25°C -40°C
Rev. Page
GAIN DRIFT (PPM/°C)
GAIN DRIFT (PPM/°C)
Figure Gain Drift Distribution, SOIC, Temperature Range 25°C 85°C
Figure Gain Drift Distribution, SOIC, Temperature Range 25°C 125°C
AD8202 THEORY OPERATION
AD8202 consists preamp buffer arranged shown Figure Like-named resistors have equal values. preamp uses dynamic bridge (subtractor) circuit. Identical networks (within shaded areas), consisting attenuate input signals applied When equal amplitude signals asserted Input Input output equal common potential (that attenuators form balanced-bridge network. When bridge balanced, differential input voltage thus output, common-mode voltage applied both inputs keeps bridge balanced output Because resistor networks carefully matched, common-mode signal rejection approaches this ideal state. However, signals applied inputs differ, result difference input responds adjusting output drive adjust voltage inverting input until matches voltage noninverting input. attenuating voltages amplifier inputs held within power supply range, even input levels exceed supply fall below common (ground). input network also attenuates normal (differential) mode voltages. form attenuator that scales feedback, forcing large output signals balance relatively small differential inputs. resistor ratios establish preamp gain Because differential input signal attenuated then amplified yield overall gain Amplifier operates higher noise gain, multiplying deficiencies such input offset voltage noise with respect
minimize these errors while extending common-mode range, dedicated feedback loop used reduce range common-mode voltage applied given overall range inputs. offsetting voltage range applied compensator, input common-mode range also offset include voltages more negative than power supply. Amplifier detects common-mode signal applied adjusts voltage matched resistors reduce common-mode voltage range inputs. adjusting common voltage these resistors, common-mode input range extended while, same time, normal mode signal attenuation reduced, leading better performance referred input. output dynamic bridge taken from connected series resistor, provided lowpass filtering gain adjustment. resistors input networks preamp buffer feedback resistors ratio-trimmed high accuracy. output preamp drives gain-of-2 buffer amplifier, implemented with carefully matched feedback resistors (RF). 2-stage system architecture AD8202 enables user incorporate low-pass filter prior output buffer. separating gain into stages, full-scale, rail-to-rail signal from preamp filtered half-scale signal, resulting from filtering, restored full scale output buffer amp. source resistance seen inverting input approximately minimize effects input bias current However, this current quite small, errors resulting from applications that mismatch resistance correspondingly small. input bias current typical value however, this increase under certain conditions. example, input signal amplifier VCC/2, output attempts gain However, output saturates because maximum specified voltage correct operation below VCC. Under these conditions total input bias current increases (see Figure more information).
100k (TRIMMED)
AD8202
04981-014
Figure Simplified Schematic
Rev. Page
AD8202
-140 VSUPPLY TEMPERATURE RANGE +125°C -40°C
-120
INPUT BIAS CURRENT (nA)
-100
total error input multiplied buffer gain generates resulting error output buffer. This AD8202 system output saturation potential. high output voltage range AD8202 specified Therefore, assuming typical input bias current, output voltage range AD8202
DIFFERENTIAL-MODE VOLTAGE
Figure Input Bias Current Input Voltage Temperature. Shaded Area Bias Current from +125°C -40°C.
increase bias current, addition output saturation voltage directly affects output voltage AD8202 system (Pin shorted). example calculate correct output voltage swing AD8202, taking variables into account, follows: Amplifier output saturation potential drop output. typical input bias current multiplied preamplifier output resistor produces input Total voltage input equals output saturation voltage combined with voltage error generated input bias current
04981-053
example effect changes input bias current applied input potentials, Figure change bias current causes change error voltage input buffer amplifier. This results change overall error potential output buffer amplifier.
Rev. Page
AD8202 APPLICATIONS
AD8202 difference amplifier intended applications that require extracting small differential signal presence large common-mode voltages. differential input resistance nominally device tolerate common-mode voltages higher than supply voltage lower than ground. open collector output stage sources current within ground within
VDIFF VDIFF
GAIN
20REXT REXT 100k GAIN GAIN
AD8202
100k
REXT 100k
CURRENT SENSING
Basic automotive applications using large common-mode range shown Figure Figure capability device operate amplifier primary battery supply circuits shown Figure Figure illustrates ability device withstand voltages below system ground.
CONNECT
04981-016
High Line, High Current Sensing
REXT
Figure Adjusting Gains Less than
Current Sensing
AD8202 also used current sensing applications, such current loop shown Figure such applications, relatively large shunt resistor degrade common-mode rejection. Adding resistor equal value impedance side input corrects this error.
overall bandwidth unaffected changes gain using this method, although there small offset voltage imbalance source resistances input buffer. This often ignored, desired, nulled inserting resistor equal minus parallel REXT series with example, with REXT (yielding composite gain optional offset nulling resistor
Gains Greater Than
OUTPUT
AD8202
Connecting resistor from output buffer amplifier noninverting input, shown Figure increases gain. gain multiplied factor REXT/(REXT example, gain doubled REXT Overall gains high achievable this way. accuracy gain becomes critically dependent resistor value high gains. Also, effective input offset voltage (about times actual offset limits part's high gain, dc-coupled applications.
CONNECT
Figure Current Loop Receiver
04981-015
GAIN ADJUSTMENT
default gain preamplifier buffer respectively, resulting composite gain With addition external resistor(s) trimmer(s), gain lowered, raised, finely calibrated.
VDIFF VDIFF
GAIN REXT
20REXT REXT 100k GAIN GAIN
AD8202
100k
REXT 100k
Gains Less than
Because preamplifier output resistance external resistor connected from decreases gain factor REXT/(100 REXT) shown Figure
CONNECT
Figure Adjusting Gains
Rev. Page
04981-017
AD8202
GAIN TRIM
Figure shows method incremental gain trimming using trim potentiometer external resistor, REXT. following approximation useful small gain ranges: M/REXT)% Thus, adjustment range REXT ±10% REXT
Low-pass filters implemented several ways using AD8202. simplest case, single-pole filter dB/decade) formed when output connected input internal resistor tying adding capacitor from this node ground, shown Figure resistor added across capacitor lower gain, corner frequency increases; should calculated using parallel resistor
OUTPUT VDIFF
VDIFF
AD8202 AD8202
VDIFF
2C105
FARADS
VDIFF GAIN TRIM
REXT
04981-018
CONNECT
CONNECT
Figure Single-Pole, Low-Pass Filter Using Internal Resistor
Figure Incremental Gain Trim
Internal Signal Overload Considerations
When configuring gain values other than maximum input voltage with respect supply voltage ground must considered because either preamplifier output buffer reaches full-scale output (approximately with large differential input voltages. input AD8202 limited 0.2)/10 overall gains because preamplifier, with fixed gain reaches fullscale output before output buffer. gains greater than swing buffer output reaches full scale first limits AD8202 input 0.2)/G, where overall gain.
gain raised using resistor, shown Figure corner frequency lowered same factor gain raised. Thus, using resistor (for which gain would doubled), corner frequency 0.796 Hz/F (0.039 corner frequency).
VDIFF
AD8202
VDIFF
LOW-PASS FILTERING
many transducer applications, necessary filter signal remove spurious high frequency components including noise, extract mean value fluctuating signal with peak-to-average ratio (PAR) greater than unity. example, full-wave rectified sinusoid 1.57, raised cosine half-wave sinusoid 3.14. Signals having large spikes have PARs more. When implementing filter, should considered that output AD8202 preamplifier (A1) does clip before because this nonlinearity would averaged appear error output. avoid this error, both amplifiers should clip same time. This condition achieved when greater than gain second amplifier default configuration). example, expected, gain should increased
CONNECT
255k fC(Hz) 1/C(F)
04981-020
Figure 2-Pole, Low-Pass Filter
2-pole filter (with roll-off dB/decade) implemented using connections shown Figure This Sallen-Key form based amplifier. useful remember that 2-pole filter with corner frequency 1-pole filter with corner have same attenuation frequency (f22/f1). attenuation that frequency (f2/f1), which illustrated Figure Using standard resistor value shown equal capacitors (see Figure 47), corner frequency conveniently scaled Hz/F (0.05 corner). maximally flat response occurs when resistor lowered scaling then 1.145 Hz/F. output offset raised approximately (equivalent input pins).
Rev. Page
04981-019
AD8202
FREQUENCY
ATTENUATION
40dB/DECADE 20dB/DECADE
1-pole low-pass filter, with corner frequency providing about attenuation higher rate attenuation obtained using 2-pole filter with shown Figure Although this circuit uses separate capacitors, total capacitance less than half that needed 1-pole filter.
INDUCTIVE LOAD OUTPUT
40LOG (f2/f1)
CLAMP DIODE
04981-021
1-POLE FILTER, CORNER 2-POLE FILTER, CORNER HAVE SAME ATTENUATION -40LOG (f2/f1) FREQUENCY f22/f1 f22/f1
BATTERY
4-TERM SHUNT
432k
AD8202
Figure Comparative Responses 1-Pole 2-Pole Low-Pass Filters
POWER DEVICE 127k CONNECT COMMON fC(Hz) 1/C(F) (0.05F 20Hz)
04981-023
HIGH LINE CURRENT SENSING WITH GAIN ADJUSTMENT
Figure another refinement Figure including gain adjustment low-pass filtering.
CLAMP DIODE INDUCTIVE LOAD 4V/AMP
Figure 2-Pole Low-Pass Filter
DRIVING CHARGE REDISTRIBUTION ADCS
BATTERY
4-TERM SHUNT
191k
AD8202
POWER DEVICE
VOS/IB NULL
CONNECT
COMMON
CALIBRATION RANGE fC(Hz) 0.796Hz/C(F) (0.22F 3.6Hz)
Figure High Line Current Sensor Interface; Gain Single-Pole, Low-Pass Filter
When driving CMOS ADCs, such those embedded popular microcontrollers, charge injection cause significant deflection output voltage AD8202. Though generally short duration, this deflection persist until after sample period expires relatively high open-loop output impedance (typically AD8202. Including network output significantly reduce effect. capacitor helps absorb transient charge, effectively lowering high frequency output impedance AD8202. these applications, output signal should taken from midpoint RLAG CLAG combination, shown Figure Because perturbations from analog-to-digital converter small, output impedance AD8202 appears low. transient response, therefore, time constant governed product components, CLAG RLAG. values shown Figure this time constant programmed approximately Therefore, samples taken several tenths microseconds more, there negligible charge stack-up.
power device that either controls current load. average current proportional duty cycle input pulse sensed small value resistor. average differential voltage across shunt typically although peak value higher amount that depends inductance load control frequency. common-mode voltage, conversely, extends from roughly above ground condition about above battery voltage condition. conduction clamping diode regulates common-mode potential applied device. example, battery spike result applied common-mode potential 21.5 input devices. produce full-scale output gain used, adjustable absorb tolerance shunt. Sufficient headroom allows overrange roughly triangular voltage across sense resistor averaged
04981-022
AD8202
RLAG CLAG 0.01F
MICROPROCESSOR
04981-024
Figure Recommended Circuit Driving CMOS
Rev. Page
AD8202 OUTLINE DIMENSIONS
5.00 (0.1968) 4.80 (0.1890)
3.20 3.00 2.80
4.00 (0.1574) 3.80 (0.1497)
6.20 (0.2440) 5.80 (0.2284)
3.20 3.00 2.80
5.15 4.90 4.65
1.27 (0.0500) 0.25 (0.0098) 0.10 (0.0040)
1.75 (0.0688) 1.35 (0.0532)
0.50 (0.0196) 0.25 (0.0099)
0.95 0.85 0.75
0.65 1.10 0.80 0.60 0.40
0.51 (0.0201) COPLANARITY SEATING 0.31 (0.0122) 0.10 PLANE
0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067)
0.15 0.00
0.38 0.22 SEATING PLANE
COMPLIANT JEDEC STANDARDS MS-012-AA CONTROLLING DIMENSIONS MILLIMETERS; INCH DIMENSIONS PARENTHESES) ROUNDED-OFF MILLIMETER EQUIVALENTS REFERENCE ONLY APPROPRIATE DESIGN
0.23 0.08
COPLANARITY 0.10
COMPLIANT JEDEC STANDARDS MO-187-AA
Figure 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown millimeters (inches)
Figure 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown millimeters
ORDERING GUIDE
Model AD8202YR AD8202YR-REEL AD8202YR-REEL7 AD8202YRZ AD8202YRZ-RL1 AD8202YRZ-R71 AD8202YRMZ1 AD8202YRMZ-RL1 AD8202YRMZ-R71 AD8202YCSURF
Temperature Range -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C
Package Description Lead Standard Small Outline Package [SOIC_N] 8-Lead Standard Small Outline Package [SOIC_N] 8-Lead Standard Small Outline Package [SOIC_N] Lead Standard Small Outline Package [SOIC_N] 8-Lead Standard Small Outline Package [SOIC_N] 8-Lead Standard Small Outline Package [SOIC_N] 8-Lead Mini Small Outline Package [MSOP] 8-Lead Mini Small Outline Package [MSOP] 8-Lead Mini Small Outline Package [MSOP]
Package Option RM-8 RM-8 RM-8
Branding
Pb-free part.
Rev. Page
AD8202 NOTES
Rev. Page
AD8202 NOTES
Rev. Page
AD8202 NOTES
2005 Analog Devices, Inc. rights reserved. Trademarks registered trademarks property their respective owners. D04981-0-11/05(D)
Rev. Page
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