Noise, Precision Instrumentation Amplifier AMP01 swing guaranteed
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FEATURES Offset Voltage: Very Offset Voltage Drift: Noise: 0.12 (0.1 Excellent Output Drive: Capacitive Load Stability: Gain Range: 10,000 Excellent Linearity: 16-Bit 1000 High CMR: 1000) Bias Current: Configured Precision Output-Stage Thermal Shutdown Available Form
Noise, Precision Instrumentation Amplifier AMP01
swing guaranteed with three load resistances; Loaded with output delivers 13.0 minimum. thermal shutdown circuit prevents destruction output transistors during overload conditions. AMP01 also configured high performance operational amplifier. many applications, AMP01 used place amp/power-buffer combinations.
CONFIGURATIONS 18-Pin Hermetic Suffix)
GENERAL DESCRIPTION
AMP01 monolithic instrumentation amplifier designed high-precision data acquisition instrumentation applications. design combines conventional features instrumentation amplifier with high current output stage. output remains stable with high capacitance loads µF), unique ability instrumentation amplifier. Consequently, AMP01 amplify level signals transmission through long cables without requiring output buffer. output stage configured voltage current generator. Input offset voltage very which generally eliminates external null potentiometer. Temperature changes have minimal effect offset; TCVIOS typically 0.15 µV/°C. Excellent low-frequency noise performance achieved with minimal compromise input protection. Bias current very low, less than over military temperature range. High common-mode rejection 16-bit linearity gain 1000, peak output current achievable simultaneously. This combination takes instrumentation amplifier step further towards ideal amplifier. performance complements superb specifications. AMP01 slews V/µs into capacitive loads settles 0.01% gain 1000, boasts healthy gain-bandwidth product. These features make AMP01 ideal high speed data-acquisition systems. Gain ratio external resistors over range 10,000. very gain-temperature-coefficient ppm/°C achievable over whole gain range. Output volt-
AMP01 BTC/883 28-Lead Suffix)
CONNECT
20-Pin Suffix)
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices.
Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
AMP01-SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
unless otherwise noted.)
AMP01A 0.15 AMP01B Units µV/°C µV/°C pA/°C pA/°C
Parameter OFFSET VOLTAGE Input Offset Voltage Input Offset Voltage Drift Output Offset Voltage Output Offset Voltage Drift Offset Referred Input Positive Supply
Symbol VIOS TCVIOS VOOS TCVOOS
Conditions +25°C -55°C +125°C -55°C +125°C +25°C -55°C +125°C -55°C +125°C 1000 -55°C +125°C 1000 1000 -55°C +125°C 1000
Offset Referred Input Negative Supply
Input Offset Voltage Trim Range Output Offset Voltage Trim Range INPUT CURRENT Input Bias Current Input Bias Current Drift Input Offset Current Input Offset Current Drift INPUT Input Resistance Input Voltage Range Common-Mode Rejection TCIB TCIOS
+25°C -55°C +125°C -55°C +125°C +25°C -55°C +125°C -55°C +125°C Differential, 1000 Differential, Common Mode, 1000 +25°C2 -55°C +125°C Source Imbalance 1000 -55°C +125°C 1000
10.5 10.0
10.5 10.0
NOTES VIOS VOOS nulling minimal affect TCVOOS respectively. Refer section common-mode rejection. Specifications subject change without notice.
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AMP01 ELECTRICAL CHARACTERISTICS grades, grade, unless otherwise noted.)
AMP01E 0.15 AMP01F/G
Parameter OFFSET VOLTAGE Input Offset Voltage Input Offset Voltage Drift Output Offset Voltage Output Offset Voltage Drift Offset Referred Input Positive Supply
Symbol VIOS TCVIOS VOOS TCVOOS
Conditions +25°C TMIN TMAX TMIN TMAX2 +25°C TMIN TMAX TMIN TMAX 1000 TMIN TMAX 1000 1000 TMIN TMAX 1000
Units µV/°C µV/°C pA/°C pA/°C
Offset Referred Input Negative Supply
Input Offset Voltage Trim Range Output Offset Voltage Trim Range INPUT CURRENT Input Bias Current Input Bias Current Drift Input Offset Current Input Offset Current Drift INPUT Input Resistance Input Voltage Range Common-Mode Rejection
TCIB TCIOS +25°C TMIN TMAX TMIN TMAX +25°C TMIN TMAX TMIN TMAX Differential, 1000 Differential, Common Mode, 1000 +25°C TMIN TMAX Source Imbalance 1000 TMIN TMAX 1000
10.5 10.0
10.5 10.0
NOTES VIOS VOOS nulling minimal affect TCVOOS, respectively. Sample tested. Refer section common-mode rejection. Specifications subject change without notice.
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AMP01 ELECTRICAL CHARACTERISTICS
unless otherwise noted.)
AMP01A/E AMP01B/F/G Units
Parameter GAIN Gain Equation Accuracy
Symbol Conditions
Accuracy Measured from 1000 Gain Range Nonlinearity 10001 1001 10001,2 Output-to-Ground Short Output-to-Ground Short 1000 Oscillations1 Junction Temperature 1000 kHz, 1000 1000 1000 1000 0.01%, step 1000 13.0 13.0 12.0 12.0 0.0007 0.005 0.005 0.005 0.010 13.8 13.5 13.8 13.5 0.0007 0.005 0.005 0.007 0.015 13.8 13.5 13.8 13.5 ppm°C
Temperature Coefficient OUTPUT RATING Output Voltage Swing
VOUT
Positive Current Limit Negative Current Limit Capacitive Load Stability Thermal Shutdown Temperature NOISE Voltage Density,
13.0 13.0 12.0 12.0
Noise Current Density, Input Noise Voltage
0.15 0.12 0.16
0.15 0.12 0.16
nV/Hz nV/Hz nV/Hz nV/Hz pA/Hz V/µs
Input Noise Current DYNAMIC RESPONSE Small-Signal Bandwidth Slew Rate Settling Time
NOTES Guaranteed design. Gain tempco does include effects gain scale resistor tempco match. -55°C +125°C grades, -25°C +85°C grades, 70°C grades. Specifications subject change without notice.
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AMP01 ELECTRICAL CHARACTERISTICS
unless otherwise noted.)
AMP01A/E AMP01B/F/G -10.5 -10.5 Units
Parameter SENSE INPUT Input Resistance Input Current Voltage Range REFERENCE INPUT Input Resistance Input Current Voltage Range Gain Output
Symbol Conditions
Referenced (Note
-10.5
Referenced (Note
-10.5
POWER SUPPLY -25°C +85°C Grades, -55°C +125°C Grades linked +VOP Supply Voltage Range linked -VOP linked +VOP Quiescent Current linked -VOP
NOTE Guaranteed design. Specifications subject change without notice.
DICE CHARACTERISTICS
Size 0.111 0.149 inch, 16,539 mils (2.82 3.78 10.67
-lNPUT VOOS NULL VOOS NULL TEST PIN* SENSE REFERENCE OUTPUT (OUTPUT) (OUTPUT) VIOS NULL VIOS NULL +INPUT
MAKE ELECTRICAL CONNECTION
ORDERING GUIDE
Model AMP01AX AMP01BX AMP01BTC/883 AMP01EX AMP01FX AMP01GS
Temperature Range -55°C +125°C -55°C +125°C -55°C +125°C -25°C +85°C -25°C +85°C +70°C
Package Description 18-Pin Cerdip 18-Pin Cerdip 28-Lead 18-Pin Cerdip 18-Pin Cerdip 20-Pin
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although AMP01 features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
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AMP01 WAFER TEST LIMITS
unless otherwise noted.)
AMP01NBC Limit 1000 1000 Guaranteed Tests 1000
Parameter Input Offset Voltage Output Offset Voltage Offset Referred Input Positive Supply
Symbol Conditions VIOS VOOS
AMP01GBC Limit
Units
Offset Referred Input Negative Supply
Input Bias Current Input Offset Current Input Voltage Range Common Mode Rejection
Gain Equation Accuracy Output Voltage Swing Output Current Limit Output Current Limit Quiescent Current VOUT VOUT VOUT
Output Ground Short Output Ground Short Linked +VOP Linked -VOP
NOTES Electrical tests performed wafer probe limits shown. variations assembly methods normal yield loss, yield after packaging guaranteed standard product dice. Consult factory negotiate specifications based dice qualification through sample assembly testing.
Figure Simplified Schematic
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AMP01 ELECTRICAL CHARACTERISTICS
unless otherwise noted.)
AMP01NBC Typical 0.15 0.0007 0.15 0.12 AMP01GBC Typical 0.30 0.0007 0.15 0.12 Units µV/°C µV/°C pA/°C pA/°C nV/Hz pA/Hz V/µs
Parameter Input Offset Voltage Drift Output Offset Voltage Drift Input Bias Current Drift Input Offset Current Drift Nonlinearity Voltage Noise Density Current Noise Density Voltage Noise Current Noise
Symbol TCVIOS TCVOOS TCIB TCIOS
Conditions 1000 1000 1000 1000 1000 1000 0.01%, Step 1000
Small-Signal Bandwidth Slew Rate Settling Time
NOTES Electrical tests performed wafer probe limits shown. variations assembly methods normal yield loss, yield after packaging guaranteed standard product dice. Consult factory negotiate specifications based dice qualification through sample assembly testing.
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AMP01
Figure Input Offset Voltage Temperature
Figure Input Offset Voltage Supply Voltage
Figure Output Offset Voltage Temperature
Figure Output Offset Voltage Change Supply Voltage
Figure Input Bias Current Temperature
Figure Input Bias Current Supply Voltage
Figure Input Offset Current Temperature
Figure Common-Mode Rejection Voltage Gain
Figure Common-Mode Rejection Frequency
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AMP01
Figure Common-Mode Voltage Range Temperature
Figure Positive Frequency
Figure Negative Frequency
Figure Maximum Output Voltage Load Resistance
Figure Maximum Output Swing Frequency
Figure Closed-Loop Output Impedance Frequency
Figure Closed-Loop Voltage Gain Frequency
Figure Total Harmonic Distortion Frequency
Figure Total Harmonic Distortion Load Resistance
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AMP01
Figure Slew Rate Voltage Gain
Figure Slew Rate Load Capacitance
Figure Settling Time 0.01% Voltage Gain
Figure Voltage Noise Density Frequency
Figure Voltage Noise Density Gain
Figure Positive Supply Current Supply Voltage
Figure Negative Supply Current Supply Voltage
Figure Positive Supply Current Temperature
Figure Negative Supply Current Temperature
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AMP01
INPUT OUTPUT OFFSET VOLTAGES GAIN
Instrumentation amplifiers have independent offset voltages associated with input output stages. While initial offsets adjusted zero, temperature variations will cause shifts offsets. Systems with auto-zero correct offset errors, initial adjustment would unnecessary. However, many high-gain applications don't have auto zero. these applications, both offsets nulled, which minimal effect TCVIOS TCVOOS input offset component directly multiplied amplifier gain, whereas output offset independent gain. Therefore, gain, output-offset-errors dominate, while high gain, input-offset-errors dominate. Overall offset voltage, VOS, referred output (RTO) calculated follows; (RTO) (VIOS VOOS
AMP01 uses external resistors setting voltage gain over range 10,000. magnitudes scale resistor, gain-set resistor, related formula: RS/RG, where selected voltage gain (refer Figure 29).
where VIOS VOOS input output offset voltage specifications amplifier gain. Input offset nulling alone recommended with amplifiers having fixed gain above Output offset nulling alone recommended when gain fixed below. applications requiring both initial offsets nulled, input offset nulled first short-circuiting then output offset nulled with short removed. overall offset voltage drift TCVOS, referred output, combination input output drift specifications. Input offset voltage drift multiplied amplifier gain, summed with output offset drift; TCVOS (RTO) (TCVIOS TCVOOS
Figure Basic AMP01 Connections Gains 10,000.
where TCVIOS input offset voltage drift, TCVOOS output offset voltage specification. Frequently, amplifier drift referred back input (RTI which then equivalent input signal change; TCVOS (RTI) TCVIOS
example, maximum input-referred drift AMP01 1000 becomes;
TCVOS (RTI µV/°C µV/°C 1000
INPUT BIAS OFFSET CURRENTS
magnitude affects linearity output referred errors. Circuit performance characterized using when operating volt supplies driving volt output. reduced many applications particularly when operating volt supplies output voltage swing limited volts. Bandwidth improved with this also increases common-mode rejection approximately gain. Lowering value below cause instability some circuit configurations usually advantage. High voltage gains between thousand would require very values 2000 this value practical lower limit Below mismatch wirebond resistor temperature coefficients will introduce significant gain tempco errors. Therefore, gains above 2,000, should kept constant increased. maximum gain 10,000 obtained with Metal-film wirewound resistors recommended best results. absolute values TC's important, only ratiometric parameters. amplifiers require good gain stability with temperature time, performance unimportant. Therefore, cost metal-film types with TC's ppm/°C usually adequate Realizing full potential AMP01's offset voltage gain stability requires precision metal-film wirewound resistors. Achieving ppm/°C gain tempco gains requires temperature coefficient matching ppm/°C better.
Input transistor bias currents additional error sources which degrade input signal. Bias currents flowing through signal source resistance appear additional offset voltage. Equal source resistance both inputs will minimize offset changes bias current variations with signal voltage temperature. However, difference between bias currents, input offset current, produces nontrimmable error. magnitude error offset current times source resistance. current path must always provided between differential inputs analog ground ensure correct amplifier operation. Floating inputs, such thermocouples, should grounded close signal source best common-mode rejection. REV.
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AMP01
with volt supplies. Using volt maximum swing output substituting figures simplifies formula CMVR 10.5 gains greater than equal CMVR volt minimum; gains below CMVR reduced.
ACTIVE GUARD DRIVE
Figure Selection Gain accuracy determined ratio accuracy combined with gain equation error AMP01 (0.6% grades).
instrumentation amplifiers require attention layout thermocouple effects minimized. Thermocouples formed between copper dissimilar metals easily destroy TCVOS performance AMP01 which typically 0.15 µV/°C. Resistors themselves generate thermoelectric EMF's when mounted parallel thermal gradient. "Vishay" resistors recommended because maximum value thermoelectric generation specified. However, where thermal gradients gain ppm-50 sufficient, general-purpose metal-film resistors used
COMMON-MODE REJECTION
Rejection common-mode noise line pick-up improved using shielded cable between signal source Shielding reduces pick-up, increases input capacitance, which turn degrades settling-time signal changes. Further, imbalance source resistance between inverting noninverting inputs, when capacitively loaded, converts common-mode voltage into differential voltage. This effect reduces benefits shielding. common-mode rejection improved "bootstrapping" input cable capacitance input signal, technique called "guard driving". This technique effectively reduces input capacitance. single guard-driving signal adequate gains above should average value inputs. value external gain resistor split between resistors RG2; center provides required signal drive buffer amplifier (Figure 31).
GROUNDING
Ideally, instrumentation amplifier responds only difference between input signals rejects commonmode voltages noise. practice, there small change output voltage when both inputs experience same commonmode voltage change; ratio these voltages called common-mode gain. Common-mode rejection (CMR) logarithm ratio differential-mode gain commonmode gain, expressed specifications normally measured with full-range input voltage change specified source resistance unbalance. current-feedback design used AMP01 inherently yields high common-mode rejection. Unlike resistive feedback designs, typified three-op-amp degraded small resistances series with reference input. slight, trimmable, output offset voltage change results from resistance series with reference input. common-mode input voltage range, CMVR, linear operation calculated from formula:
majority instruments data acquisition systems have separate grounds analog digital signals. Analog ground also divided into more grounds which will tied together point, usually analog power-supply ground. addition, digital analog grounds joined, normally analog ground A-to-D converter. Following this basic grounding practice essential good circuit performance (Figure 32). Mixing grounds causes interactions between digital circuits analog signals. Since ground returns have finite resistance inductance, hundreds millivolts developed between system ground data acquisition components. Using separate ground returns minimizes current flow sensitive analog return path system ground point. Consequently, noisy ground currents from logic gates interact with analog signals. Inevitably, more circuits will joined together with their grounds differential potentials. these situations, differential input instrumentation amplifier, with high CMR, accurately transfer analog information from circuit another.
SENSE REFERENCE TERMINALS
CMVR
data sheet specification input voltage range; VOUT maximum output signal; chosen voltage gain. example, 25°C, specified 10.5 volt minimum
sense terminal completes feedback path instrumentation amplifier output stage normally connected directly output. output signal specified with respect reference terminal, which normally connected analog ground.
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AMP01
Figure AMP01 Evaluation Circuit Showing Guard-Drive Connection
Figure Basic Grounding Practice
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AMP01
heavy output currents expected load situated some distance from amplifier, voltage drops track wire resistance will cause errors. Voltage drops particularly troublesome when driving loads. Under these conditions, sense reference terminals used "remote sense" load shown Figure This method connection puts drops inside feedback loop virtually eliminates error. unbalance lead resistances from sense reference pins does degrade CMR, will change output offset voltage. example, large unbalance will change output offset only
DRIVING LOADS
directly transmitted through long cables voltage current form. Increased output current brings increased internal dissipation, especially with loads. this reason, powersupply connections split into pairs; pins connect output stage only pins provide power input following stages. Dual supply pins allow dropper resistors connected series with output stage excess power dissipated outside package. Additional decoupling necessary between pins ground maintain stability when dropper resistors used. Figure shows complete circuit driving loads.
HEATSINKING
Output currents guaranteed into loads into addition, output stable free from oscillation even with high load capacitance. combination these unique features instrumentation amplifier allows low-level transducer signals conditioned
maintain high reliability, temperature should kept practicable, preferably below 100° Although most AMP01 application circuits will produce very little internal heat little more than quiescent dissipation mW-some circuits will raise that serval hundred
Figure Remote Load Sensing
Figure Driving Loads
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AMP01
milliwatts (for example, 4-20 current transmitter application, Figure 37). Excessive dissipation will cause thermal shutdown output stage thus protecting device from damage. heatsink recommended power applications reduce temperature. Several appropriate heatsinks available; Thermalloy 6010B especially easy inexpensive. Intended dual-in-line packages, heatsink attached with cyanoacrylate adhesive. This heatsink reduces thermal resistance between junction ambient environment approximately 80°C/W. Junction (die) temperature then calculated using relationship:
Protection also achieved connecting back-to-back Zener diodes across differential inputs. This technique does affect input noise level used down gain with minimal increase input current. Although voltage-clamping elements look like short circuits limiting voltage, majority signal sources provide less than producing power levels that easily handled low-power Zeners. Simultaneous connection differential inputs impedance signal above during normal circuit operation unlikely. However, additional protection involves adding current-limiting resistors each signal path prior voltage clamp, resistors increase input noise level just nV/Hz (refer Figure 35). Input components, they multiplexers resistors, should carefully selected prevent formation thermocouple junctions which would degrade input signal.
where junction ambient temperatures respectively, thermal resistance from junction ambient, device's internal dissipation.
OVERVOLTAGE PROTECTION
Instrumentation amplifiers invariably front instrumentation systems where there high probability exposure overloads. Voltage transients, failure transducer, removal amplifier power supply while signal source connected destroy degrade performance unprotected amplifier. Although impractical protect internally against connection power lines, relatively easy provide protection against typical system overloads. AMP01 internally protected against overloads gains 100. higher gains, protection reduced some external measures required. Limited internal overload protection used that noise performance would significantly degraded. AMP01 noise level approaches theoretical noise floor input stage which would nV/Hz when gain 1000. Noise result shot noise input devices Johnson noise resistors. Resistor noise calculated from values (200 gain 1000) input protection resistors (250 Active loads input transistors contribute less than nV/Hz noise. measured noise level typically nV/Hz. Diodes across input transistor's base-emitter junctions, combined with input resistors protect against differential inputs gains 100. diodes also prevent avalanche breakdown that would degrade specifications. Decreasing value gains above limits maximum input overload protection External series resistors could added guard against higher voltage levels input, resistors alone increase input noise degrade signal-to-noise ratio, especially high gains.
Figure Input Overvoltage Protection Gains 10,000
POWER SUPPLY CONSIDERATIONS
Achieving rated performance precision amplifiers practical circuit requires careful attention external influences. example, supply noise changes nominal voltage directly affect input offset voltage. means that change supply, uncommon value, will produce input offset change. Consequently, care should taken choosing power unit that output noise level, good line load regulation, good temperature stability.
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AMP01
Figure High Compliance Bipolar Current Source with 13-Bit Linearity
Figure 13-Bit Linear 4-20 Transmitter Constructed Adding Voltage Reference. Thermocouple Signals Accepted without Preamplification
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AMP01
Figure Adding Transistors Increases Output Current Without Affecting Quiescent Current Power Bandwidth
Figure AMP01 Makes Excellent Programmable-Gain Instrumentation Amplifier. Combined Gain-Switching Settling Time 13-Bits Falls Below Linearity Better than 12-Bits over Gain Range 1000
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AMP01
Figure Differential Input Instrumentation Amplifier with Differential Output Replaces Transformer Many Applications. Output will Drive Load Distortion, (0.01%)
Figure Configuring AMP01 Noninverting Operational Amplifier Provides Exceptional Performance. Output Handles Load Impedances Very Distortion, 0.006%
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AMP01
Figure Inverting Operational Amplifier Configuration Excellent Linearity over Gain Range 1000, Typically 0.005%. Offset Voltage Drift Unity Gain Improved over Drift Instrumentation Amplifier Configuration
Figure Stability with Large Capacitive Loads Combined with High Output Current Capability make AMP01 Ideal Line Driving Applications. Offset Voltage Drift Approaches TCVIOS Limit, (0.3 V/°C)
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AMP01
Figure Noise Test Circuit (0.1
Figure Settling-Time Test Circuit
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AMP01
Figure Instrumentation Amplifier with Auto-Zero
Figure Burn-In Circuit
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AMP01
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
Q-18 18-Lead Cerdip (X-Suffix)
0.005 (0.13)
0.098 (2.49)
0.310 (7.87) 0.220 (5.59)
0.960 (24.38) 0.200 (5.08) 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36) 0.060 (1.52) 0.015 (0.38) 0.150 (3.81) 0.100 (2.54) 0.070 (1.78) SEATING 0.030 (0.76) PLANE
0.320 (8.13) 0.290 (7.37)
0.015 (0.38) 0.008 (0.20)
E-28A 28-Terminal Ceramic Leadless Chip Carrier Suffix
0.075 (1.91) 0.095 (2.41) 0.075 (1.90) 0.011 (0.28) 0.007 (0.18) 0.075 (1.91) 0.088 (2.24) 0.054 (1.37)
0.100 (2.54) 0.064 (1.63)
0.300 (7.62) 0.150 (3.51)
0.015 (0.38) 0.028 (0.71) 0.022 (0.56) 0.050 (1.27)
0.458 (11.63) 0.442 (11.23) 0.458 (11.63)
BOTTOM VIEW
0.055 (1.40) 0.045 (1.14)
0.200 (5.08)
R-20/SOL-20 20-Lead Wide Body (SOIC) (S-Suffix)
0.5118 (13.00) 0.4961 (12.60)
0.1043 (2.65) 0.0926 (2.35)
0.0291 (0.74) 0.0098 (0.25)
0.0118 (0.30) 0.0040 (0.10)
0.0500 0.0192 (0.49) (1.27) 0.0138 (0.35) SEATING 0.0125 (0.32) PLANE 0.0091 (0.23)
0.0500 (1.27) 0.0157 (0.40)
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PRINTED U.S.A.
0.4193 (10.65) 0.3937 (10.00)
0.2992 (7.60) 0.2914 (7.40)
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