PRINCIPLE FUNCTION Conversion input voltage referenced ground out

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PRINCIPLE FUNCTION Conversion input voltage referenced ground out

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Industrial Converter Protector AM462
PRINCIPLE FUNCTION
Conversion input voltage referenced ground output current Integrated protection external components Integrated, adjustable current/voltage sources external components
6.35V
Single-ended input voltage 0.VCC-5V
AM462
IOUT e.g. 0/4.20mA
VREF 5/10V
10mA
TYPICAL APPLICATIONS
Adjustable voltage-to-current (V/I) converter Adjustable voltage current source (supply unit) Voltage regulator with additional functions Industrial protector output microprocessors (the Frame ASIC concept [1]) Peripheral processor examples typical applications Example Applications
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: http://www.analogmicro.de Phone: Fax: Email: (0)6131/91 (0)6131/91 info@analogmicro.de
December2006 1/20 Rev.
Industrial Converter Protector AM462
CONTENTS
CONTENTS FEATURES GENERAL DESCRIPTION BLOCK DIAGRAM ELECTRICAL SPECIFICATIONS BOUNDARY CONDITIONS DETAILED DESCRIPTION FUNCTIONS INITIAL OPERATION AM462
General information 3-wire applications current Setting output current range Selecting supply voltage Using current source Using voltage reference
POINTS NOTE: INITIAL OPERATION AM462 APPLICATIONS
Typical 3-wire application with input signal referenced ground Typical 2-wire application with input signal referenced ground Application input signal with offset
BLOCK DIAGRAM PINOUT EXAMPLE APPLICATIONS DELIVERY PACKAGE DIMENSIONS FURTHER READING
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December2006 2/20 Rev.
Industrial Converter Protector AM462
FEATURES
Supply voltage: 6.35V Wide working temperature range: -40°C.+85°C Adjustable integrated reference voltage source: Additional voltage/current source Adjustable amplification Adjustable offset Industrial current output (e.g. 0/4.20mA) Protection against reverse polarity Short-circuit protection Output current limitation Low-cost device: replaces number discrete elements 3-wire operation Individually configurable function modules RoHS compilant
GENERAL DESCRIPTION
AM462 universal converter amplifier with number additional functions. basically consists amplifier, whose gain externally, output stage which convert voltage signals referenced ground industrial 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 built-in output current limit. Converter AM462 enables industrial current loop signals (e.g. 0/4-20mA) produced relatively easily. Using Frame ASIC concept connected processor signal correction.
BLOCK DIAGRAM
CVREF CVSET
AM462
VSET VREF
Voltage Reference
RSIOUT
OUTAD INDAI
Figure Block diagram AM462 (individually configurable function modules)
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December2006 3/20 Rev.
Industrial Converter Protector AM462
ELECTRICAL SPECIFICATIONS
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 Trim Range Current VREF Temperature Line Regulation Load Regulation Load Capacitance Current/Voltage Source Internal Reference Temperature Current Source: VBG/RSET, from Figure Adjustable Current Range Output Voltage dVBG/dT Tamb 40.+85°C 1.20 1.27 1.35 ±140 ppm/°C VREF VREF10 VREFADJ IREF* dVREF/dT dVREF/dV dVREF/dV dVREF/dI dVREF/dI 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
ICV*
Voltage Source: R6), from Figure Adjustable Voltage Range Output Current Load Capacitance Operational Amplifier Gain Stage (OP1) Adjustable Gain Input Range Power Supply Rejection Ratio Offset Voltage GGAIN PSRR ICV*
Source Sink Source mode ±0.5 -100
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December2006 4/20 Rev.
Industrial Converter Protector AM462
Parameter Symbol Conditions Min. Typ. Max. Unit Operational Amplifier Gain Stage (OP1) (cont.) Temperature Input Bias Current Temperature Output Voltage Limitation Output Voltage Range 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 Output Current Range Output Resistance Load Capacitance Stage Internal Gain Input Voltage Offset Voltage Temperature Input Bias Current Temperature Protection Functions Voltage Limitation Protection against reverse polarity Current event reverse polarity System Parameters Nonlinearity Ideal input 0.05 0.15 VLIMR0 VINDAI GSET VSET Ground VOUT Ground IOUT Ground 35V, IOUT GSET VSET dVOS/dT dIB/dT ±0.5 ±1.6 1.15 ±1.5 µV/°C pA/°C VR0FS dVOS/dT dRIN/dT IOUTOS dIOUTOS/dT IOUTOS dIOUTOS/dT IOUTC dIOUTC/dT VOUT VOUT 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
dVOS/dT dIB/dT VLIM VOUTAD VOUTAD Adjustable 0,12 0.75
VREF
VREF
µV/°C pA/°C
0.125 1.00
0,13 1.25 µV/°C k/°C nA/°C nA/°C nA/°C
2-wire operation maximum current IOUTmin valid
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December2006 5/20 Rev.
Industrial Converter Protector AM462
BOUNDARY CONDITIONS
Parameter Sense Resistor Stabilization Resistor Load Resistance Gain Resistors Offset Resistors VREF Capacitance Output Capacitance Breakdown Voltage Forward Current Gain Symbol
Conditions IOUTFS 20mA 20mA/IOUTFS IOUTFS 20mA 20mA/IOUTFS Limitation only 3-wire operation
Min.
Typ.
Max.
Unit
Ceramic Only 2-wire operation BCX54/55/56, example
DETAILED DESCRIPTION FUNCTIONS
AM462 modular, universal converter protector which been specially developed conditioning voltage signals referenced ground. designed both 3-wire operation industrial applications (cf. application Figure AM462's various functions depicted block diagram (Figure which also illustrates external components required operation this particular device. AM462 consists several modular function blocks (operational amplifiers, voltage-to-current converters references) which, depending external configurations, either switched another 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 OP1's input INP. internal 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. 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:
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December2006 6/20 Rev.
Industrial Converter Protector AM462
VINDAI with
with VINDAI voltage INDAI VSET voltage (V/I converter inputs)1.
VREF VCVREF VSET
VCVSET
AM462
Voltage Reference
VINP
VOUTAD VINDAI
IOUT
Ground
Figure Block diagram AM462 with external components (3-wire circuit current output)
AM462 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 above external resistors used (inserted between VREF VSET between VSET GND; Figure External (ceramic) capacitor VREF stabilizes 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.
construction converter such that output current IOUT largely independent current amplification external transistor Production-specific variations current amplification transistors used compensated internally converter.
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December2006 7/20 Rev.
Industrial Converter Protector AM462
INITIAL OPERATION AM462
General information 3-wire applications current 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 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.
2-wire system signal source conditioning
Ground
IOUT
3-wire system signal source conditioning
Ground
IOUT
Ground
Ground
Figure difference between 3-wire operation Setting output current range When using amplification stage together with converter voltage-to-current conversion 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:
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December2006 8/20 Rev.
Industrial Converter Protector AM462
INDAI
thus ratio resistors R3/R4:
VREF
output current range conjunction with selected external resistors fine adjustment with Using Equations following calculated output current IOUT
VINP GGAIN with GGAIN
Selecting supply voltage System supply voltage needed operate AM462 dependent selected mode operation. When using current output IOUT conjunction with external transistor) value dependent that relevant load resistor (max. 600) used application. minimum system supply voltage then:
Here, IOUTmax stands maximum output current VCCmin minimum supply voltage which dependent selected reference voltage:
VREF
VCCmin IOUTmax VCCmin RLmax IOUTmax 20mA
Working range
Figure Working range conjunction with load resistor
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Industrial Converter Protector AM462
working range resulting from Equation described Figure Example calculations typical values external components found example applications from page onwards. Using current source additional operational amplifier easily connected constant current source. Using circuit Figure following applies:
connected current source
AM462
RSET
Figure Using constant current source Example courrent source
bridge symbol represents component supplied with current (e.g. piezoresistive sensing element temperature sensor). supply current set. Using Equation following value calculated external resistor RSET, which turn stipulates size current:
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Industrial Converter Protector AM462
Using 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 miniaturization devices need ever lower levels power dissipation digital components today growing importance.
connected voltage reference
VCVREF
AM462
Figure Using voltage reference
additional operational amplifier easily connected voltage reference. Using circuit Figure following applies:
CVREF
Example voltage reference voltage VCVREF 3.3V set. Using Equation following ratio calculated external resistors
CVREF
following example values produced resistors:
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Industrial Converter Protector AM462
POINTS NOTE: INITIAL OPERATION AM462
When operating AM462 imperative that external capacitor always connected (cf. Figure Care must taken that value capacitance does beyond given range, even across range temperature (see Boundary Conditions page 2-wire operation ceramic capacitor must also used (cf. Figure 2-wire setup power consumption overall system (AM462 plus external components, including configuration resistors) must exceed IOUTmin (usually 4mA). AM462 function blocks required application must connected defined (and allowed) potential. load resistance maximum permitted current output. 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 AM462 amplifies converts positive voltage signal referenced ground. unused blocks (e.g. OP2) have been defined operating points application. Alternatively, these function groups also used here (e.g. supply external components). output current IOUT following applies according Equations
VINP with GGAIN
Example: 0.20mA Voltage-To-Current Transmitter obtain signal VINP 0.1V input external components dimensioned such that output current range 0.20mA (i.e. ISET GND). With
VINP VINP GAIN
following then applies gain:
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December2006 12/20 Rev.
Industrial Converter Protector AM462
3-wire connection
AM462
ISET
Voltage Reference
VINP
Single-ended input voltage
IOUT
Connections setting unused function blocks defined operating point
Ground
Figure Typical application input signals referenced ground
GGAIN
20mA 4.32 VINP
4.32 3.32
Observing boundary conditions (page following values obtained external components: 33.2k 0.600 2.2µF
Typical 2-wire application with input signal referenced ground
2-wire operation (cf. Figure system supply voltage connected RS-. ground (pin GND) connected node between resistor load resistor ground (GND) same system ground (Ground). output signal picked load resistor which connects current output IOUT system ground. must ensured that 2-wire operation additional current load (use current/voltage source) limited domestic current supply limitation. output current IOUT following applies according Equations
VINP with GGAIN
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December2006 13/20 Rev.
Industrial Converter Protector AM462
AM462
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 operation input signals referenced ground
Example 4.20mA Voltage-To-Current Transmitter
obtain signal VINP 0.1V input external components dimensioned such that output current range 4.20mA. following applies:
VINP VINP GAIN
With ISET Equation produces following resistors
VREF 22.15 thus following value gain: GGAIN 16mA 3.456 VINP 3.456 2.456
Observing given boundary conditions, following values obtained external components: 24.56k 44.3k 0.600 2.2µF 100nF
December2006 14/20 Rev.
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Industrial Converter Protector AM462
Application input signal with offset
uncommon input signals have offset (e.g. 0.5.4.5V 1.6V). signals such these offset current generated output also when ISET circuit then dimensioned described following. According Equation following applies required current swing output IOUT IOUTmax IOUTmin:
VPIN
VPIN
(10)
input current swing VINmax VINmin necessary gain calculated
VPIN
(11)
input signal routed directly (INDAI) voltage divider without having used (see Figure With this circuitry following results:
VPIN
VPIN
(12)
From input offset VINmin following output current then obtained when ISET
(VIN
(13)
Using Equation required minimum output current IOUTmin then set:
with
(14)
Example 4.20mA Voltage-To-Current Transmitter with Input Signal Offset
obtain signal 0.5.4.5V external components dimensioned such that output current range 4.20mA. circuitry shown Figure used here. however, available user additional used impedance converter voltage-to-current converter input INDAI, example. With reference Equation with voltage swing obtained VPIN 16mA 3.456V Using Equation following applies: VPIN 3.456V 0.157 VPIN 3.456V 6.35
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December2006 15/20 Rev.
Industrial Converter Protector AM462
3-wire connection
AM462
Voltage reference
IOUT
Single-ended input voltage
Connections setting unused function blocks defined operating point
Ground
Figure Converting input signal with
According Equation minimum output current generated input offset calculated 6,37 0.5V 6.37
obtain output current IOUT 4.20mA, according above current ISET must then added. With reference Equation ratio calculated thus:
VREF
VREF 45.3
Observing given boundary conditions, following values obtained external components: 0.600 63.7k 2.2µF 90.6k
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Industrial Converter Protector AM462
BLOCK DIAGRAM PINOUT
CVREF CVSET VSET VREF
AM462
Voltage Reference
RSIOUT
OUTAD INDAI
Figure Block diagram AM462
NAME CVREF CVSET OUTAD INDAI N.C. IOUT N.C. VSET VREF
EXPLANATION
Current/Voltage reference Current/Voltage reference Positive input Negative input System amplification output Current output stage input connected Current output Sensing resistor Supply voltage Sensing resistor connected Reference voltage source ground Reference voltage source output Output offset current
CVREF CVSET OUTAD INDAI N.C. IOUT
VREF VSET N.C.
Figure AM462
Table AM462
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Industrial Converter Protector AM462
EXAMPLE APPLICATIONS
Application voltage-to-current converter
Protection against short circuiting reverse polarity
6.35V 0.1, 0.5V other 0/4.20mA
AM462
Figure Application current converter
Converting 0.5.4.5V sensor (voltage) signal
Protection against short circuiting reverse polarity
VREF 5/10V VOUT 0.5.4.5V
6.35V 4.20mA
Sensor
AM462
Figure Converting 0.5.4.5V sensor signal
Configuration peripheral processor
Protection against short circuiting reverse polarity
VCVR 3.3V
VREF
6.35V 0/4.20mA
AM462
Figure Configuration peripheral processor supply unit
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Industrial Converter Protector AM462
Application analog output supply unit sensors
Protection against short circuiting reverse polarity
5/10V
3.3V
6.35V 0/4.20mA
Sensor
AM462
Figure Output supply unit sensor applications
Application front-end back-end microprocessors
VCVREF=3.3V Protection against short circuiting reverse polarity
VREF=5/10V
6.35V 0/4.20mA
Sensor
AM462
Figure Application analog front back microprocessors (Frame ASIC concept)
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Industrial Converter Protector AM462
DELIVERY
AM462 converter protector available following packages:
SSOP16 SO16(n)
Dice blue foil request)
PACKAGE DIMENSIONS
Please website (data sheets: package.pdf).
FURTHER READING
www.analogmicro.de
Frame ASIC concept: See:
AM462 used integrated solution interface microprocessor industrial 4.20mA network. See: Technical Articles: PR1011 Interfacing µProcessor with 4.20mA current loop signal (PLC). See: Application notes AN1014.
NOTES
Analog Microelectronics reserves right make amendments dimensions, technical data other information contained herein without further notice.
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December2006 20/20 Rev.

PRINCIPLE FUNCTION Conversion input voltage referenced ground out

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