Noise, Precision Instrumentation Amplifier AMP01* CONFIGURATIONS
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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 GENERAL DESCRIPTION
Noise, Precision Instrumentation Amplifier AMP01*
CONFIGURATIONS 18-Lead Cerdip
VOOS NULL VOOS NULL TEST PIN* SENSE REFERENCE OUTPUT
VIOS NULL VIOS NULL +VOP -VOP
AMP01
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 µV), 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 voltage 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. 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.
VIEW (Not Scale) *MAKE ELECTRICAL CONNECTION
AMP01 BTC/883 28-Terminal
VIOS NULL
VOOS NULL VOOS NULL TEST PIN*
VIOS NULL +VOP
AMP01
VIEW (Not Scale)
SENSE
CONNECT
*MAKE ELECTRICAL CONNECTION
20-Lead SOIC
TEST PIN* VOOS NULL VOOS NULL TEST PIN* SENSE REFERENCE OUTPUT
-VOP
TEST PIN* VIOS NULL VIOS NULL
AMP01
VIEW (Not Scale)
-VOP
*MAKE ELECTRICAL CONNECTION
*Protected under U.S. Patent Numbers 4,471,321 4,503,381. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 1999
+VOP
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 nulling minimal affect respectively. Refer section common-mode rejection. Specifications subject change without notice.
REV.
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 TMAX1 +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°C3 TMIN TMAX Source Imbalance 1000 TMIN TMAX 1000
10.5 10.0
10.5 10.0
NOTES Sample tested. VIOS nulling minimal affect TCVIOS TCVOOS respectively. Refer section common-mode rejection. Specifications subject change without notice.
REV.
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, Over Temp. 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.
REV.
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.
ORDERING GUIDE Model AMP01AX AMP01AX/883C AMP01BTC/883C AMP01BX AMP01BX/883C AMP01EX AMP01FX AMP01GBC AMP01GS AMP01GS-REEL AMP01NBC Temperature Range Package Description Package Option -55°C +125°C -55°C +125°C -55°C +125°C -55°C +125°C -55°C +125°C -25°C +85°C -25°C +85°C +70°C +70°C 18-Lead Cerdip 18-Lead Cerdip 28-Terminal 18-Lead Cerdip 18-Lead Cerdip 18-Lead Cerdip 18-Lead Cerdip 20-Lead SOIC Tape Reel Q-18 Q-18 E-28A Q-18 Q-18 Q-18 Q-18 R-20 R-20
5962-8863001VA* -55°C +125°C 5962-88630023A* -55°C +125°C 5962-8863002VA* -55°C +125°C
*Standard military drawing available.
18-Lead Cerdip 28-Terminal 18-Lead Cerdip
Q-18 E-28A Q-18
DICE CHARACTERISTICS
Size 0.111 0.149 inch, 16,539 mils (2.82 3.78 10.67
-INPUT VOOS NULL VOOS NULL TEST PIN* SENSE REFERENCE OUTPUT
(OUTPUT) (OUTPUT) VIOS NULL VIOS NULL +INPUT
MAKE ELECTRICAL CONNECTION
REV.
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
NOTE 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.
VIOS NULL REFERENCE 47.5k RGAIN RSCALE 2.5k VOOS NULL 2.5k 47.5k +VOP OUTPUT -VOP
SENSE
Figure Simplified Schematic
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
REV.
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
NOTE 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.
REV.
AMP01-Typical Performance Characteristics
INPUT OFFSET VOLTAGE INPUT OFFSET VOLTAGE TEMPERATURE UNIT OUTPUT OFFSET VOLTAGE POWER SUPPLY VOLTAGE Volts TEMPERATURE
Figure Input Offset Voltage Temperature
Figure Input Offset Voltage Supply Voltage
Figure Output Offset Voltage Temperature
OUTPUT OFFSET VOLTAGE CHANGE
INPUT BIAS CURRENT -0.5 -1.0
TEMPERATURE INPUT BIAS CURRENT
-0.5 -1.0 -1.5
POWER SUPPLY VOLTAGE Volts
POWER SUPPLY VOLTAGE Volts
Figure Output Offset Voltage Change Supply Voltage
Figure Input Bias Current Temperature
Figure Input Bias Current Supply Voltage
INPUT OFFSET CURRENT -0.2 -0.4 -0.6 TEMPERATURE COMMON-MODE REJECTION
COMMON-MODE REJECTION
1000 VOLTAGE GAIN FREQUENCY 100k
Figure Input Offset Current Temperature
Figure Common-Mode Rejection Voltage Gain
Figure Common-Mode Rejection Frequency
REV.
AMP01
COMMON-MODE INPUT VOLTAGE Volts TEMPERATURE POWER SUPPLY REJECTION FREQUENCY 100k FREQUENCY 100k 1000 POWER SUPPLY REJECTION 1000
Figure Common-Mode Voltage Range Temperature
Figure Positive Frequency
Figure Negative Frequency
OUITPUT VOLTAGE Volts LOAD RESISTANCE PEAK-TO-PEAK AMPLITUDE Volts
OUTPUT IMPEDANCE 1000 IOUT 20mA
0.01
100k FREQUENCY
0.001
100k FREQUENCY
Figure Maximum Output Voltage Load Resistance
Figure Maximum Output Swing Frequency
Figure Closed-Loop Output Impedance Frequency
1000 VOLTAGE GAIN
0.08 TOTAL HARMONIC DISTORTION 0.07 0.06 0.05 1000 0.04 0.03 0.02 0.01 TOTAL HARMONIC DISTORTION VOUT
0.02 1kHz VOUT
0.01
FREQUENCY 100k
FREQUENCY
LOAD RESISTANCE
Figure Closed-Loop Voltage Gain Frequency
Figure Total Harmonic Distortion Frequency
Figure Total Harmonic Distortion Load Resistance
REV.
AMP01
SLEW RATE SLEW RATE SETTLING TIME STEP
VOLTAGE GAIN
100p
100n LOAD CAPACITANCE VOLTAGE GAIN
Figure Slew Rate Voltage Gain
Figure Slew Rate Load Capacitance
Figure Settling Time 0.01% Voltage Gain
1000 VOLTAGE NOISE VOLTAGE NOISE
POSITIVE SUPPLY CURRENT 1kHz
VOLTAGE GAIN
FREQUENCY
POWER SUPPLY VOLTAGE Volts
Figure Voltage Noise Density Frequency
Figure Voltage Noise Density Gain
Figure Positive Supply Current Supply Voltage
NEGATIVE SUPPLY CURRENT POSITIVE SUPPLY CURRENT
NEGATIVE SUPPLY CURRENT
VSENSE VREF
POWER SUPPLY VOLTAGE Volts
TEMPERATURE
TEMPERATURE
Figure Negative Supply Current Supply Voltage
Figure Positive Supply Current Temperature
Figure Negative Supply Current Temperature
-10-
REV.
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 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) (TCV TCVOOS 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
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).
SENSE
AMP01
OUTPUT
REFERENCE
VOLTAGE GAIN,
Figure Basic AMP01 Connections Gains 10,000
example, maximum input-referred drift AMP01 1000 becomes; TCVOS (RTI µV/°C
µV/°C 1000
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 important, only ratiometric parameters. amplifiers require good gain stability with temperature time, performance unimportant. Therefore, cost metal-film types with 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 BIAS OFFSET CURRENTS
Input transistor bias currents additional error sources that 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.
-11-
AMP01
100k RESISTANCE
data sheet specification input voltage range; VOUT maximum output signal; chosen voltage gain. example, +25°C, specified 10.5 volt minimum 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
VOLTAGE GAIN
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: OUT| CMVR
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
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.
-12-
REV.
AMP01
0.047 +15V GUARD DRIVE -15V OUTPUT SENSE +15V
VOLTAGE GAIN,
(20R
0.047
WITH COMPONENTS SHOWN
AMP01
VIOS NULL VOOS NULL
*SOLDER LINK
100k REFERENCE
100k
SIGNAL GROUND 0.047 GROUND 0.047
-15V
Figure AMP01 Evaluation Circuit Showing Guard-Drive Connection
ANALOG POWER SUPPLY +15V -15V
DIGITAL POWER SUPPLY
DIGITAL GROUND
AMP01
ANALOG GROUND SMP-11 SAMPLE HOLD
DIGITAL GROUND
DIGITAL DATA OUTPUT
OUTPUT REFERENCE
HOLD CAPACITOR
0.047 CERAMIC CAPACITORS
Figure Basic Grounding Practice
REV.
-13-
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
combination these unique features instrumentation amplifier allows low-level transducer signals conditioned directly transmitted through long cables voltage current form. Increased output current brings increased internal dissipation, especially with loads. this reason, power-supply 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.
Output currents guaranteed into loads into addition, output stable free from oscillation even with high load capacitance.
IN4148 DIODES OPTIONAL. DIODES LIMIT OUTPUT
VOLTAGE EXCURSION SENSE AND/OR REFERENCE LINES BECOME DISCONNECTED FROM LOAD. SENSE
TWISTED PAIRS REMOTE LOAD
AMP01
REFERENCE
OUTPUT GROUND
Figure Remote Load Sensing
POWER BANDWIDTH, 100, 130kHz POWER BANDWIDTH, 200kHz T.H.D.~0.04% 1kHz, 2Vrms
+15V 0.047 SENSE 0.047
REFERENCE 0.047 VOUT LOAD
AMP01
0.047 -15V
VOLTAGE GAIN,
Figure Driving Loads
RESISTERS REDUCE DISSIPATION
-14-
REV.
AMP01
HEATSINKING
maintain high reliability, temperature should kept practicable, preferably below 100°C. Although most AMP01 application circuits will produce very little internal heat little more than quiescent dissipation mW-some circuits will raise that several hundred 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:
External series resistors could added guard against higher voltage levels input, resistors alone increase input noise degrade signal-to-noise ratio, especially high gains. 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, whether multiplexers resistors, should carefully selected prevent formation thermocouple junctions that would degrade input signal.
OPTIONAL PROTECTION
RESISTORS, TEXT. 9.1V ZENERS +15V LINEAR INPUT RANGE, MAXIMUM DIFFERENTIAL PROTECTION
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
AMP01
VOUT
-15V
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.
REV.
-15-
AMP01
+15V COMPLIANCE, TYPICALLY LINEARITY ~0.01% OUTPUT RESISTANCE 20mA POWER BANDWIDTH (-3dB) ~60kHz INTO LOAD 0.047 -15V IOUT 0.047
ROUT TRIM SENSE REFERENCE
AMP01
IOUT
IOUT 20mA 100mV 20mA FULL SCALE
Figure High Compliance Bipolar Current Source with 13-Bit Linearity
RESISTORS METAL FILM 2.75k 0.047 ZERO TRIM IOUT 20mA +15V +30V 0.047
ROUT TRIM REF-02
AMP01
2.21k
COMPLIANCE IOUT, +20V WITH +30V SUPPLY (OUTPUT w.r.t. DIFFERENTIAL INPUT 100mV 16mA SPAN OUTPUT RESISTANCE IOUT 20mA LINEARITY 0.01% SPAN
Figure 13-Bit Linear 4-20 Transmitter Constructed Adding Voltage Reference. Thermocouple Signals Accepted Without Preamplification.
-16-
REV.
AMP01
+15V 0.047
2N4921 0.047 SENSE REFERENCE 2N4918 VOLTAGE GAIN, POWER BANDWIDTH (-3dB), 60kHz QUIESCENT CURRENT, LINEARITY~0.01% FULL OUTPUT INTO 0.047
AMP01
VOUT INTO
-15V
Figure Adding Transistors Increases Output Current Without Affecting Quiescent Current Power Bandwidth kHz.
Q2.J110 Q5.J107 .CMP-04 .OP15GZ 200k +15V -15V 2.7k
+15V
0.047
SENSE
AMP01
VOOS NULL VIOS NULL
REFERENCE
0.047 100k 100k
LINEARITY~0.005%, ~0.02%, 1000 GAIN ACCURACY, UNTRIMMED~0.5%
+15V
G100
G1000
-15V
SETTLING TIME 0.01%, GAINS, LESS THAN GAIN SWITCHING TIME, LESS THAN
COMPATIBLE INPUTS
Figure AMP01 Makes Excellent Programmable-Gain Instrumentation Amplifier. Combined Gain-Switching Settling Time Bits Falls Below Linearity Better than Bits over Gain Range 1000.
REV.
-17-
AMP01
1.5k 470pF OP37 +15V 0.047
*MATCHED 0.1%
SENSE
AMP01
REFERENCE
0.047
VOLTAGE GAIN,
-15V OUTPUT DIFFERENTIAL COMMON-MODE OUTPUT REFERENCE MAX)
MAXIMUM OUTPUT, INTO T.H.D. 0.01% 1kHz, INTO
Figure Differential Input Instrumentation Amplifier with Differential Output Replaces Transformer Many Applications. Output will Drive Load Distortion, (0.01%).
+15V
POWER BANDWIDTH (-3dB)~150kHz 0.047 TOTAL HARMONIC DISTORTION~0.006% @1kHz, INTO 1000pF
SENSE
AMP01
VOUT
4.95k 0.047
-15V VOLTAGE GAIN,
CLOSED-LOOP VOLTAGE GAIN MUST GREATER THAN STABLE OPERATION CONNECT
Figure Configuring AMP01 Noninverting Operational Amplifier Provides Exceptional Performance. Output Handles Load Impedances Very Distortion, 0.006%.
-18-
REV.
AMP01
220k
0.01
SENSE VOUT
4.7k
AMP01
INTO
1000pF.
TOTAL HARMONIC DISTORTION: <0.005% 1kHz, VOUT 1000
GAIN 0.047 +15V -15V 0.047
1.5k 1.2k 1000
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.
+15V 4.7k 0.01 0.047 -15V 680pF SENSE 0.047 POWER BANDWIDTH (-3dB)~60kHz TOTAL HARMONIC DISTORTION~0.001% @1kHz, INTO 1000pF CONNECT VOUT
AMP01
4.7k
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 °C).
REV.
-19-
AMP01
16.2k 200k G1000 G100 100) eOUT 1000 G1000 G1,10,100 16.2k 1.82k 1.62M
OP215 9.09k OUTPUT
AMP01
OP215
1000)
eOUT
Figure Noise Test Circuit (0.1
0.1%
1.91k 0.1% VOUT HSCH-1001 0.1% 0.1%
G100 1.1k 0.1% G1000 0.1% 200k 0.1% 0.1% 0.1% G100 G1000 0.1%
0.1%
AMP01
0.047
0.047
Figure Settling-Time Test Circuit
-20-
REV.
AMP01
+15V DG390 ANALOG SWITCH SENSE DAC-08 0.047 0.01 7.5k INPUT "OFFSET" INPUT "ZERO" -15V REFERENCE 7.5k VOLTAGE GAIN, 0.047
AMP01
VOUT
Figure Instrumentation Amplifier with Autozero
+18V 0.047 0.047 -18V SENSE VOUT
AMP01
Figure Burn-In Circuit
REV.
-21-
AMP01
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
18-Lead Cerdip (Q-18)
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)
28-Terminal Ceramic Leadless Chip Carrier (E-28A)
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)
20-Lead SOIC (R-20)
0.5118 (13.00) 0.4961 (12.60)
0.4193 (10.65) 0.3937 (10.00)
0.2992 (7.60) 0.2914 (7.40)
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)
-22-
REV.
PRINTED U.S.A.
C3103b-0-12/99
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