AM460 PRINCIPLE FUNCTION Amplification conversion voltage si

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AM460 PRINCIPLE FUNCTION Amplification conversion voltage si

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Industrial Converter Protector
AM460
PRINCIPLE FUNCTION
Amplification conversion voltage signals referenced ground Integrated protection external components Integrated, adjustable current/voltage sources external components
6.35V
Single-ended input signal
IOUT 0/4.20mA
AM460
e.g. 0.5V, 0.1V
VOUT 0.5/10V
VREF 5/10V
e.g. 1.5mA
TYPICAL APPLICATIONS
Peripheral processor (see Figure page Industrial protector output microprocessors (Frame ASIC concept [1]) Impedance converter Adjustable voltage current source (supply unit) Voltage regulator with additional functions
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: (0)6131/91 Fax: (0)6131/91 E-mail: info@analogmicro.de
April 2003 1/18 Rev.
Industrial Converter Protector
TABLE CONTENTS
Features General Description Block Diagram Electrical Specifications Boundary Conditions Detailed Description Functions Operating AM460 General information 3-wire applications current output Setting voltage gain using voltage output Setting output current range using current output Selecting supply voltage Connecting current source Connecting voltage reference Operating AM460: Important Points Note Applications Typical 3-wire application with input signal referenced ground Typical 2-wire application with input signal referenced ground Block Diagram Pinout Examples Possible Applications Delivery Further Reading
AM460
TABLE FIGURES
Table AM460 pinout Figure Block diagram AM460 Figure Block diagram AM460 with external components (3-wire circuit current output) Figure Difference between 3-wire operation Figure Working range conjunction with load resistor Figure Connecting constant current source Figure Connecting voltage reference Figure Typical application input signals referenced ground Figure Typical 2-wire application input signals referenced ground Figure Block diagram AM460 Figure Pinout Figure Application input signals referenced ground (protected output stage, impedance converter etc.) Figure Complex configuration peripheral processor Figure Conversion 0.5.4.5V sensor signal
analog microelectronics
April 2003 2/18
Industrial Converter Protector
FEATURES
Supply voltage: 6.35V Wide working temperature range: -40°C.+85°C Adjustable integrated reference voltage source: Additional voltage/current source Operational amplifier with integrated driver stage Adjustable amplification Analogue parallel voltage (0.5/10V) current output (0/4.20mA) Protection against reverse polarity short-circuiting Output current limit Low-cost device: replaces number discrete elements 3-wire operation
AM460
GENERAL DESCRIPTION
AM460 universal converter amplifier with number additional functions. basically consists amplifier, whose gain externally, parallel output stages which condition signals referenced ground industrial voltage current signals. additional reference voltage source supply external components also included device. further operational amplifier connected current source, voltage reference comparator. main features integrated protective circuitry. device protected against reverse polarity, short-circuiting built-in output current limit. Amplifier AM460 enables industrial standard voltage (e.g. 0-5/10V) current loop (e.g. 0/4-20mA) signals produced relatively easily.
BLOCK DIAGRAM
CVREF VSET VREF
AM460
CVSET
Voltage Reference
RSIOUT
OUTAD
VOUT
INDAI INDAV
Figure Block diagram AM460
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: (0)6131/91 Fax: (0)6131/91 E-mail: info@analogmicro.de
April 2003 3/18 Rev.
Industrial Converter Protector
ELECTRICAL SPECIFICATIONS
AM460
Tamb 25°C, 24V, VREF IREF (unless otherwise stated), currents flowing into negative
Parameter Supply Voltage Range Quiescent Current Temperature Specifications Operating Storage Junction Thermal Resistance Tamb Voltage Reference Voltage VREF VREF10 Trim Range Current VREF Temperature Line Regulation VREFADJ IREF* dVREF/dT dVREF/dV dVREF/dV Load Regulation dVREF/dI dVREF/dI Load Capacitance Current/Voltage Source Internal Reference Temperature Current Source: VBG/RSET, from Figure Adjustable Current Range Output Voltage ICV* Voltage Source: R6), from Figure Adjustable Voltage Range Output Current Load Capacitance Operational Amplifier Gain Stage (OP1) Adjustable Gain Input Range GGAIN Power Supply Rejection Ratio Offset Voltage Temperature PSRR dVOS/dT ±0.5 µV/°C ICV* Source Sink Source mode -100 dVBG/dT Tamb 40.+85°C 1.20 1.27 1.35 ±140 ppm/°C IREF Tamb 40.+85°C 6V.35V 6V.35V, IREF VSET connected VSET GND, 4.75 0.05 0.06 5.00 10.0 5.25 10.5 VREF10 10.0 ±140 0.10 0.15 ppm/°C ppm/V ppm/V %/mA %/mA DIL16 plastic package SO16 narrow plastic package °C/W °C/W Symbol Tamb 40.+85°C, IREF Conditions Min. Typ. Max. Unit
analog microelectronics
April 2003 4/18
Industrial Converter Protector
Parameter Operational Amplifier Gain Stage (OP1) (cont.) Input Bias Current Temperature Output Voltage Limit Output Voltage Range dIB/dT VLIM VOUTAD VOUTAD Load Capacitance Operational Amplifier Output Stage (OP3) Internal Gain Input Range Power Supply Rejection Ratio Offset Voltage Temperature Input Bias Current Temperature Output Voltage Range PSRR dVOS/dT dIB/dT VOUT VOUT Output Current Limitation Output Current Load Resistance Load Capacitance Converter Internal Gain Trim Range Voltage Range Offset Voltage Temperature Input Resistance Temperature Output Offset Current IOUTOS Temperature Output Offset Current IOUTOS Temperature Output Control Current IOUTC Temperature Output Voltage Range VR0FS dVOS/dT dRIN/dT IOUTOS dIOUTOS/dT IOUTOS dIOUTOS/dT IOUTC dIOUTC/dT VOUT VOUT Output Current Range Output Resistance Load Capacitance IOUTFS ROUT 3-wire operation 3-wire operation 2-wire operation 2-wire operation 2-wire operation, VR0/100mV 2-wire operation VOUT IOUT, VOUT IOUT, IOUT VR0/R0, 3-wire operation Adjustable 0.75 0.125 1.00 ILIM IOUT VOUT 2.15 ±0.5 2.20 VREF Symbol Conditions Min. Typ.
AM460
Max. Unit
pA/°C
VREF
2.25 µV/°C pA/°C
ILIM
1.25 µV/°C k/°C nA/°C nA/°C nA/°C
analog microelectronics
April 2003 5/18
Industrial Converter Protector
Parameter Stage Internal Gain Input Voltage Offset Voltage Temperature Input Bias Current Temperature Protection Functions Voltage Limitation Protection against reverse polarity Current with reverse polarity System Parameters Nonlinearity Ideal input 0.05 VLIMR0 VLIMR0 VINDAI GVI, VINDAI GSET VSET Ground VOUT Ground IOUT Ground 35V, IOUT GSET VSET dVOS/dT dIB/dT ±0.5 ±1.6 Symbol Conditions Min. Typ.
AM460
Max. Unit
1.15 ±1.5
µV/°C pA/°C
0.15
2-wire operation maximum current IOUTmin valid
BOUNDARY CONDITIONS
Parameter Sense Resistor Symbol Stabilisation Resistor Load Resistor Gain Resistors Offset Resistors VREF Capacitor Output Capacitor Breakdown Voltage Forward Current Gain BCX54/55/56, example Ceramic Only 2-wire operation Conditions IOUTFS 20mA 20mA/IOUTFS IOUTFS 20mA 20mA/IOUTFS Only 3-wire operation Min. Typ. Max. Unit
DETAILED DESCRIPTION FUNCTIONS
AM460 modular, universal converter protector which been specially developed conditioning voltage signals referenced ground. been conceived both 3-wire operation1 industrial applications (cf. application page functions AM460 depicted block diagram (Figure which also illustrates external components required operation this particular device. Electrical specifications external components given page
principle AM460 such that only current output used 2-wire operation.
analog microelectronics
April 2003 6/18
Industrial Converter Protector
VREF VCVREF VCVSET
AM460
VSET
AM460
Voltage Reference
VINP
VOUTAD
VOUT
IOUT
VINDAI VINDAV
Ground
Figure Block diagram AM460 with external components (3-wire circuit current output) AM460 consist several modular function blocks (operational amplifiers, voltage-to-current converters references) which depending external configurations either switched together operated separately (see basic circuitry Figure Operational amplifier stage enables positive voltage signal amplified. gain GGAIN external resistors Protective circuitry against overvoltage integrated into chip, limiting voltage value reference voltage. Output voltage VOUTAD OUTAD calculated
VOUTAD VINP GGAIN with GGAIN
where VINP voltage input INP. Using current-limited operational amplifier stage with integrated protection against reverse polarity industrial voltage signal (VOUT) realised. internal amplification fixed value 2.2. output configured driver that particularly suitable output stage. output voltage VOUT VOUT following applies:
VOUT VINDAV
with VINDAV voltage INDAV (OP3 input). voltage-to-current converter (V/I converter) provides voltage-controlled current signal output IOUT (pin which activates external transistor this turn supplies actual output current IOUT.
analog microelectronics
April 2003 7/18
Industrial Converter Protector
AM460
reduce power dissipation transistor external component protected against reverse polarity additional diode offset current ISET output IOUT (with help internal voltage reference external voltage divider shown Figure example). External resistor permits output current finely adjusted with parallel operation current voltage output. output current provided following ratio applies:
VINDAI with
with VINDAI voltage INDAI VSET voltage (V/I converter inputs, Figure 2)2. AM460 reference voltage source enables voltage supplied external components (such sensors, microprocessors, etc.). reference voltage value VREF VSET. VSET connected, VREF VSET switched ground, VREF 10V. Values between these external resistors used (inserted between VREF VSET between VSET GND). External (ceramic) capacitor VREF stabilises reference voltage. must connected even voltage reference use. additional operational amplifier stage used current voltage source supply external components. OP2's positive input connected internally voltage that output current output voltage across wide range using external resistors.
OPERATING AM460
General information 3-wire applications current output 3-wire operation (cf. Figure right Figure ground (pin GND) connected external mass system Ground. system's supply voltage connected RS+. 2-wire operation (cf. Figure left Figure system supply voltage connected RS-. ground (pin GND) connected node between resistor load resistor (current output IOUT). ground (GND) same system ground (Ground)!! output signal picked load resistor which connects current output IOUT system ground. 2-wire system signal source conditioning
Ground
IOUT
3-wire system signal source conditioning
Ground
IOUT
Ground
Ground
Figure Difference between 3-wire operation
construction converter such that output current IOUT largely independent current amplification external transistor Production-specific variations current amplification transistors used compensated internally converter.
analog microelectronics
April 2003 8/18
Industrial Converter Protector
AM460
2-wire operation ground "virtual" (floating), with constant load resistance supply voltage device changes according current. rule, following equation applies 2-wire operation:
(VIN
reason this that 2-wire operation connected series actual load resistor This illustrated Figure 3-wire operation ground connected ground system. Setting voltage gain using voltage output Using amplifier stages signal conditioning overall gain selecting suitable external resistors transfer function output voltage calculated multiplying Equations follows:
VOUT VINP GGAIN
with GGAIN R1/R2 2.2. Setting output current range using current output When using amplification stage together with converter signal conditioning offset output current should first compensated suitable selection resistors this input must connected ground (VINP With short circuit input connecting converter VSET shown Figure values output current according Equation follows:
(VINDAI VREF
thus ratio resistors R3/R4:
VREF
output current area conjunction with selection external resistors fine adjustment with With Equations following calculated output current IOUT
VINP GGAIN with GGAIN
Selecting supply voltage System supply voltage needed operate AM460 dependent selected mode operation. When using voltage output VOUT minimum needed operation determined maximum output voltage VOUTmax required application. This expressed follows:
VOUT
analog microelectronics
April 2003 9/18
Industrial Converter Protector
VCCmin IOUTmax
AM460
VCCmin RLmax IOUTmax 20mA
Operating range
Figure Working range conjunction with load resistor When using current output IOUT conjunction with external transistor) value dependent that relevant load resistor (max. 600) used application. minimum system supply voltage then:
(10)
Here, IOUTmax stands maximum output current VCCmin minimum supply voltage which dependent selected reference voltage:
VREF
(11)
working range resulting from Equation described Figure Example calculations typical values external components found example applications from page onwards. Connecting current source additional operational amplifier easily connected constant current source. Using cir-
connected current source
AM460
RSET
Figure Connecting constant current source
analog microelectronics
April 2003 10/18
Industrial Converter Protector
cuit Figure following applies:
AM460
(12)
bridge symbol represents component supplied with current (e.g. piezoresistive sensing element temperature sensor). Example supply current set. Using Equation following value calculated external resistor RSET, which turn stipulates size current:
Connecting voltage reference addition integrated voltage reference also used supply voltage external components such converters microprocessors, example. Lower voltages generated (e.g. 3.3V) which with increasing miniaturisation devices need ever lower levels power dissipation digital components today growing importance. additional operational amplifier easily connected voltage reference. Using circuit Figure following applies:
CVREF
(13)
Example voltage VCVREF 3.3V set. Using Equation following ratio calculated external resistors
VCVREF
connected voltage reference
AM460
Figure Connecting voltage reference
analog microelectronics
April 2003 11/18
Industrial Converter Protector
CVREF
AM460
following example values produced resistors:
OPERATING AM460: IMPORTANT POINTS NOTE
When using AM460 imperative that external capacitor top-grade ceramic capacitor) always connected (cf. Figure Care must taken that value capacitor, also within temperature range, does exceed range values given boundary conditions page 2-wire operation ceramic capacitor must also used (cf. Figure 2-wire setup power consumption entire system (AM460 plus external components, including configuration resistors) must exceed IOUTmin (usually 4mA). AM460 function blocks required application must connected defined (and allowed) potential. With operation voltage output load resistance VOUT must least When operating current output maximum load resistance permitted. values external resistors must selected within permissible range given boundary conditions page
APPLICATIONS
Typical 3-wire application with input signal referenced ground Figure shows 3-wire application which AM460 amplifies converts positive voltage signal referenced ground. unused blocks (e.g. OP2) have been defined operating points. Alternatively, these function groups also used here (e.g. supply external components). this particular application, using Equations output voltage VOUT calculated VOUT VINP with GGAIN output current IOUT following applies according Equation
VINP with GGAIN
(14)
analog microelectronics
April 2003 12/18
Industrial Converter Protector
AM460
3-wire connection
ISET
AM460
Voltage Reference
VINP
VOUT
Single-ended input voltage
IOUT
Connections setting unused function blocks defined operating point
Ground
Figure Typical application input signals referenced ground Example obtain signal VINP 0.1V input external components dimensioned such that output current range 0.20mA (i.e. ISET GND) output voltage 0.10V. Using Equation output voltage defined follows: VOUT VOUT VINP 3.55 VINP i.e. GGAIN
4.55
following then applies output current:
VINP VINP GAIN
VINP
GGAIN 4.55 28.44 20mA
Observing boundary conditions, following values obtained external components: 28.44 35.5k 0.600 2.2µF
analog microelectronics
April 2003 13/18
Industrial Converter Protector
Typical 2-wire application with input signal referenced ground
AM460
2-wire operation (cf. Figure system supply voltage connected RS-. ground (pin GND) connected node between resistor load resistor (current output IOUT). ground (GND) same system ground (Ground)!! output signal picked load resistor which connects current output IOUT system ground. output current IOUT following applies according Equation
VINP with GGAIN
Example obtain signal VINP 0.1V input external components dimensioned such that output current range 4.20mA.
VINP VINP GAIN
With Equation produces following:
VREF 22.15
thus following value gain set:
AM460
Voltage Reference
VINP
ground:
2-wire connection
Single-ended input voltage
IOUT
System ground: Ground
Different potentials!
Ground
Connections setting unused function blocks defined operating point
Figure Typical 2-wire application input signals referenced ground
analog microelectronics
April 2003 14/18
Industrial Converter Protector
GGAIN 16mA 3.456 VINP
AM460
3.456 2.456
Observing boundary conditions, following values obtained external components: 24.56k 44.3k 0.600 2.2µF 100nF
analog microelectronics
April 2003 15/18
Industrial Converter Protector
BLOCK DIAGRAM PINOUT
VREF
AM460
CVREF
VSET
AM460
CVSET
Voltage Reference
RSIOUT
OUTAD
VOUT
INDAI INDAV
Figure Block diagram AM460
NAME CVREF CVSET OUTAD INDAI INDAV IOUT RSVCC VOUT VSET VREF
EXPLANATION Current/Voltage reference Current/Voltage reference Positive input Negative input System amplification output Current output stage input Voltage output stage input Current output Sensing resistor Supply voltage Sensing resistor Voltage output Reference voltage source ground Reference voltage source output Output offset current
CVREF CVSET OUTAD INDAI INDAV IOUT
VREF VSET VOUT
Figure Pinout
Table AM460 pinout
analog microelectronics
April 2003 16/18
Industrial Converter Protector
EXAMPLES POSSIBLE APPLICATIONS
Conditioning signals referenced ground (protected output stage, impedance converter etc.)
AM460
6.35V 0/4.20mA 0.1, 0.5V others
Protection agains short-circuiting reverse polarity
AM460
0.5/10V
Figure Application input signals referenced ground (protected output stage, impedance converter etc.) Complex configuration peripheral processor
Protection agains short-circuiting reverse polarity
VCVREF 3.3V
VREF
6.35V 0/4.20mA
AM460
Figure Complex configuration peripheral processor Conversion 0.5.4.5V sensor signal
0.5/10V
VREF VOUT 0.5.4.5V
6.35V 4.20mA
Protection agains short-circuiting reverse polarity
Sensor
AM460
1.6V
Figure Conversion 0.5.4.5V sensor signal
analog microelectronics
April 2003 17/18
Industrial Converter Protector
DELIVERY
AM460 converter protector available following packages: DIP16 SO16(n) (maximum power dissipation 300mW) Dice blue foil
AM460
FURTHER READING
Frame ASIC concept: http://www.Frame-ASIC.de/ Analog Microelectronics GmbH website: http://www.analogmicro.de/
NOTES
Analog Microelectronics reserves right make amendments dimensions, technical data other information herein without further notice.
analog microelectronics
April 2003 18/18

AM460 PRINCIPLE FUNCTION Amplification conversion voltage si

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