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industrial voltage amplifier ic AM401 analog microelectronics march 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 1/21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de principle function amplification and conversion of diffe rential signals referenced to ground to adjustable industrial voltages (0...vcc-5v, e.g. 0...5/10v etc.) variable current/voltage source and integrated protective circuitry typical applications ? transducer for sensor applications, for example ? analog output stage for microprocessors ? impedance converter ? voltage regulator with voltage and current sources ? analog front-end and back-end ic (frame asic concept [1]) ? adjustable output stage ic AM401 v = 6?35v cc i = 0...10ma s differential input voltage 400mv single-ended input voltage 0...5v v = 0...v - 5v adjustable e.g. 0...10 v out cc v = 5/10v re f
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 2 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de contents general description .................................................................................................3 block diagram .............................................................................................................3 electrical specifications ......................................................................................4 boundary conditions ................................................................................................6 detailed description of functions .....................................................................7 AM401?s transfer function...................................................................................................... ......................................... 8 setting the instrumen tation amplifier.......................................................................................... ................................... 8 setting the voltage amplification .............................................................................................. ....................................... 9 selecting the supply voltage ................................................................................................... .......................................... 9 points to note: initial operation of AM401 ..................................................................................... .............................. 10 applications ................................................................................................................10 application 1 ? differential input signal , voltage output signal of 0...5/10v.................................................. ........... 10 application 2 ? voltage output signal of 0...5/10v, current-driven sensing element............................................. ... 10 application 3 ? differential input signal, voltage output signal of 0.5...4.5v................................................. ........... 10 application 4 ? input voltage (referenced to gro und) of 0...1v and output voltage of 0...10v................................ 10 application 5 ? connecting up op2 as a voltage reference ....................................................................... ................. 10 circuit topology ......................................................................................................10 topology of the 0...5/10v application .......................................................................................... ................................. 10 topology of the 0.5...4.5v application......................................................................................... .................................. 10 block diagram and pinout ....................................................................................10 example applications .............................................................................................10 delivery ........................................................................................................................10 package dimensions .................................................................................................10 further reading .......................................................................................................10
industrial voltage amplifier ic AM401 analog microelectronics march 2006 analog microelectronics gmbh tele fon: +49 (0)6131/91 073 ? 0 3/21 an der fahrt 13, d ? 55124 mainz telefax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro.de e?mail: info@analogmicro . de features ? supply voltage range: 6...35v ? wide operating temperature range: ?40c...+85c ? adjustable voltage reference: 5 to 10v ? additional current/voltage source ? instrumentation amplifier input cmvi: 1.5...vcc-3v ? operational amplifier input vin: 0...vcc-5v ? adjustable gain and offset ? adjustable output voltage range: 0...vcc-5v, e.g. 0.5...4.5v, 0...5/10v ? individually configurable function modules ? protection against reverse polarity ? output current limitation ? short-circuit protection ? protection against esd ? rohs compliant general description AM401 and AM401p [2] are universal voltage transmitters designed for differential bridge signal conditioning. the two devices differ in their offset and offset drift values. the ics are modular and their functional units individually accessible. both ics consist of a high-precision instrumentation amplifier for differential input signals and an operational amplifier for input signals referenced to ground. a robust reference voltage source (adjustable between 5 and 10v) can be used to power external components. an operational amplifier stage whose gain is also adjustable acts as an output. the devices also contain an additional operational amplifier which can be used as a current or voltage source. the ic is protected against reverse polarity and has an integrated output current limit. standard industrial voltages (e.g. 0?5/10v, 0.5?4.5v) can be easily generated using transmitter ics AM401 and AM401p. block diagram 1 2 3 4 14 13 5 6 11 15 12 v bg cvref cvset in+ in _ gnd za outia inop 7 8 gain vout vcc vref vset vo l t ag e r e f e r en c e AM401 + _ op2 + _ op1 + _ ia figure 1: block diagram of AM401 (indivi dually configurable function)
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 4 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de electrical specifications t amb = 25c, v cc = 24v, v ref = 5v, i ref = 1ma (unless otherwise stated) parameter symbol conditions min. typ. max. unit voltage range v cc 6 35 v quiescent current i cc t amb = ? 40...+85c, i ref = 0ma 1.5 ma temperature specifications operating t amb ?40 85 c storage t st ?55 125 c junction t j 150 c thermal resistance ja dil16 plastic package 70 c/w ja ssop plastic package 120 c/w ja so16 narrow plastic package 140 c/w voltage reference voltage v ref vset not connected 4.90 5.00 5.10 v v ref vset = gnd , v cc 11v 9.8 10.0 10.2 v current i ref 0.2 10.0 ma v ref vs. temperature d v ref /d t t amb = ? 40...+85c 90 140 ppm/c line regulation d v ref /d v v cc = 6v...35v 30 80 ppm/v d v ref /d v v cc = 6v...35v, i ref 5ma 60 150 ppm/v load regulation d v ref /d i 0.05 0.10 %/ma d v ref /d i i ref 5ma 0.06 0.15 %/ma load capacitance c l 1.9 2.2 5.0 f current/voltage source (op2) internal reference v bg 1.20 1.27 1.35 v v bg vs. temperature d v bg /d t t amb = ? 40...+85c 60 140 ppm/c current source: i cv = v bg / r ext (see page 10 for details) adjustable current range i cv 0 10 ma output voltage v cv v cc < 18v v bg v cc ? 5 v v cv v cc 18v v bg 13 v voltage source: v cv = v bg (1+ r 4 / r 3 ) (see page 13 for details) adjustable voltage range v cv v cc < 18v 0.4 v cc ? 5 v v cv v cc 18v 0.4 13 v output current i cv source 10 ma i cv sink ?100 a load capacitance c l source mode 0 1 10 nf
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 5 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de electrical specifications parameter symbol conditions min. typ. max. unit instrumentation amplifier (ia) AM401 internal gain g ia 4.9 5 5.1 differential input voltage range v in 0 400 mv common mode input range cmir v cc < 9v, i cv < 2ma 1.5 v cc ? 3 v cmir v cc 9v, i cv < 2ma 1.5 6.0 v common mode rejection ratio cmrr 80 90 db power supply rejection ratio psrr 80 90 db offset voltage v os 1.5 6 mv v os vs. temperature d v os /d t 5 v/c input bias current i b ?120 ?300 na i b vs. temperature d i b /d t ?0.35 ?0.8 na/c output voltage range* v outia v cc < 9v, r lia 10k ? 0* v cc ? 3 v v outia v cc 9v, r lia 10k ? 0* 6 v minimum output voltage v outiamin without external load resistance r lia 5 17 mv load capacitance c l 250 pf instrumentation amplifier (ia) AM401p internal gain g ia 4.9 5 5.1 differential input voltage range v in 0 400 mv common mode input range cmir v cc < 9v, i cv < 2ma 1.5 v cc ? 3 v cmir v cc 9v, i cv < 2ma 1.5 6.0 v common mode rejection ratio cmrr 80 90 db power supply rejection ratio psrr 80 90 db offset voltage v os 1,5 mv v os vs. temperature d v os /d t 5 v/c input bias current i b ?120 ?300 na i b vs. temperature d i b /d t ?0.35 ?0.8 na/c output voltage range* v outia v cc < 9v, r lia 10k ? 0* v cc ? 3 v v outia v cc 9v, r lia 10k ? 0* 6 v minimum output voltage v outiamin without external load resistance r lia 5 17 mv load capacitance c l 250 pf zero adjust stage (ia) internal gain g za 1 input voltage v za v za v outia ? g ia v in 0 v outia v offset voltage v os 0.5 2.0 mv v os vs. temperature d v os /d t 1.6 5 v/c input bias current i b 38 100 na i b vs. temperature d i b /d t 24 75 pa/c
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 6 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de electrical specifications parameter symbol conditions min. typ. max. unit voltage output stage (op1) adjustable gain g op 1 input range ir v cc < 10v 0 v cc ? 5 v ir v cc 10v 0 5 v power supply rejection ratio psrr 80 90 db offset voltage v os 0.5 2 mv v os vs. temperature d v os /d t 3 7 v/c input bias current i b 5 12 na i b vs. temperature d i b /d t 3.5 10 pa/c output voltage range v out v cc < 18v 0 v cc ? 5 v v out v cc 18v 0 13 v output current limitation i lim v out 10v 5 7 10 ma output current i out 0 i lim ma load resistance r l 2 k ? load capacitance c l 500 nf protection functions protection against reverse polarity ground vs. v s vs. v out r 1 20 k ? 35 v output current limitation i lim v out 10v 10 ma system parameters nonlinearity ideal input 0.05 0.15 %fs * depending on external load resistance at output ia ( r lia 10k ? ? v outia < 3mv ); internal load resistance is 100k ? currents flowing into the ic are negative boundary conditions parameter symbol conditions min. typ. max. unit sum gain resistors r 1 + r 2 90 200 k ? sum reference adjustment resistors r 3 + r 4 20 200 k ? stabilization capacitance @ v ref c 1 1.9 2.2 5.0 f v ia capacitance c 2 10 100 pf important condition: * the reference output always has to source 1ma.
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 7 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de detailed description of functions AM401 is a monolithically integrated voltage transmitter which has been designed for the conditioning of differential bridge voltages and for the conversion of voltage signals referenced to ground. by varying just a few external components the output voltage can be adjusted over a wide range. all of the function blocks are individually acce ssible, enabling them to be used as functional units or, using the relevant external circuitry, conf igured as an application-specific device. typical applications and values for external components are given in the examples described in the following. in essence AM401 consists of 4 functional blocks as shown in figure 1. the individual blocks are as follows: 1. the core element of AM401 is its high-precision instrumentation amplifier (ia) with an internal gain of g ia and the ability to set the reference potential of the amplifier externally (pin za ). the ia acts as an input stage for differential voltage signals. 2. there is also an operational amplifier stage (op1). op1?s gain of g op 1 can be set using external resistors r 1 and r 2 (see figure 2). the operational amplifie r output has been designed in such a way that with certain loads it can be set down to zero. in addition, the output stage can drive up to a maximum of 10ma without an external transi stor having to be connected. an output current limit has been implemented as a protective feature which guards the ic at the output in the event of a short-circuit. 3. AM401?s voltage reference permits voltage to be supplied by external components (such as sensors, microprocessors, etc.). the reference voltage v ref has a value of either 5v or 10v. external capacitance c 1 acts as a reference voltage stabilizer. it must also be connected when the voltage reference is not in use (see: figure 2). 4. an additional operational amplifier (op2) can be used as a current or voltage source for the supply of external components. op2?s positive input is connected internally to voltage v bg so that the output current or voltage can be set across a wide range using one or two external resistors. descriptions of the relevant app lications can be found on the following pages. the operational amplifier output has a sufficiently high drive power. one of AM401?s main features is its range of inte grated protective circuits which make the ic an effective output stage. ? pins vout , vcc and gnd are protected against reverse polarity across the entire supply voltage range without the need for any additional external components. ? the output of the ic is protected against short-circuiting. ? all pins (with the exception of vout , vcc and gnd ) are protected by internal esd diodes.
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 8 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de AM401?s transfer function in compliance with figure 2 the transfer func tion for AM401 when used as an amplifier for differential signals with a voltage output is: () za in ia op out v v g g v + = (1) where: () 2 1 1 r r g g g g ia op ia + = = (2) setting the instrumentation amplifier the transfer function of the instrume ntation amplifier is determined by: za in ia outia v v g v + = with an offset voltage of v za which can be set at pin za . with the circuitry shown in figure 2 and using the additional operational amplifier the offset voltage is determined thus: 1 2 3 4 14 13 5 6 11 15 12 v bg c 1 c 2 r 2 r 3 r a r in r b r 4 v offset r 1 cvref cvset in+ in _ gnd za outia inop 7 8 gain vout vcc vref vset ground v out vo l t ag e r e f e r en c e v cc v in AM401 _ + op2 + _ ia + _ op1 fi g ure 2 : the g eneral functions of AM401
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 9 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de () bg ref bg offset v v r r v v ? ? = 3 4 (3) the following applies to the ic?s actual output voltage v out (transfer function of op1): inop op out v g v ? = (4) with an adjustable gain of g op : 1 2 1 + = r r g op (5) setting the voltage amplification the gain of operational amplifier st age op1 can be set using the suitably selected external resistors r 1 and r 2 . if op1 is connected up as a non-inverti ng amplifier (see: figure2) output voltage v out at pin vout is calculated as follows: 1 op in out g v v ? = with 1 2 1 1 + = r r g op where v in is the voltage at op1?s input pin inop . selecting the supply voltage in principle AM401 can be used across the entire supply voltage range defined herein. however, depending on the output voltage selected and the circuitry of the remaining components certain boundary conditions apply when selecting v cc : ? when using voltage output pin vout the ic?s minimum supply voltage v cc necessary for the operation of the device depends on the maximum output voltage v out max required by the application. the following applies: v 5 max + out cc v v (6) ? if the additional operational amplifier op2 is used as a voltage reference or current source, the minimum supply voltage selected ( v cc ) depends on the maximum voltage at pin cvref . the following applies: v 5 max + cvref cc v v (7) when using pin vout and operational amplifier op2 as a voltage reference or current source the higher value of vcc must be set.
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 10 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de points to note: initial operation of AM401 1. when operating AM401 it is imperative th at external stabilization capacitance c 1 (a high-grade ceramic capacitor) is must always connected. care must be taken that the value of the capacitance does not lie beyond its given range, even across the range of temperature (see boundary conditions ). the maximum current drawn from the reference must not exceed a value of i ref = 10ma. 2. all of the AM401 function blocks not used by the application (e.g. op2) must be connected up to a defined (and permitted) potential. unused blocks, such as the additional operational amplifier (see figure 3), must be configured. the two capacitances c 1 and c 2 must be connected up in any event, even if the reference voltage source is not used. 3. when op1 is in operation the load resistance at pin vout must be at least 2k ?. the values of external resistors r 1 , r 2 , r 3 and r 4 must be selected so th at they lie within the permitted range specified in the boundary conditions on. c 1 c 2 r 2 r 1 ground v out v cc 1 2 3 4 14 13 5 6 11 15 12 v bg cvref cvset in+ in _ gnd za outia inop 7 8 gain vout vcc vref vset vo l t ag e r e f e r e nc e AM401 + _ op2 + _ op1 + _ ia figure 3 : AM401 used as an industrial bridge amplifier
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 11 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de applications application 1 ? differential input sign al, voltage output signal of 0...5/10v with applications which require an output voltage of 0...5/10v the pin used to configure the instrumentation amplifier offset ( za ) is connected to the ic?s ground . gain g is set using the two external resistors r 1 and r 2 : () 2 1 1 r r g g g g ia op ia + = = (2) if no offset voltage is present, the transf er function of the output voltage (gl.1) is: v out = g v in using these equations the values of resistors r 1 and r 2 can be set as follows: r r v gv out ia in 1 2 1 =? example 1: input voltage (differential) of 0...50mv and output voltage range of 0...10v if v in = 0...50mv, r 1 / r 2 = 39 and i ref 1ma the values of the external components are as follows: r 1 117k ? r 2 3k ? g ia = 5 c 1 = 2.2f c 2 = 10nf example 2: input voltage (differential) of 0...100mv and output voltage range of 0...5v if v in = 0...100mv, r 1 / r 2 = 9 and i ref 1ma the values of the external components are as follows: r 1 90k ? r 2 10k ? g ia = 5 c 1 = 2.2f c 2 = 10nf
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 12 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de application 2 ? voltage output signal of 0...5/10v, current-driven sensing element in this application the additional op is used as a current source for a resistor measuring bridge. the values of the external components have been calcula ted for an output voltage of 0...5v; the pin used to configure the instrumentation amplifier offset ( za ) is connected to the ic?s ground . gain g is set using the two external resistors r 1 and r 2 : () 2 1 1 r r g g g g ia op ia + = = (2) if no offset voltage is present, the transf er function of the output voltage (gl.1) is: v out = g v in (1) using these equations the values of resistors r 1 and r 2 can be set as follows: 1 2 1 ? = in ia out v g v r r supply current i s for the sensor bridge can be determined using resistance r set : i v r s bg set = (8) c 2 c 1 r 2 r 1 r ref r set ground v out v cc v in 1 2 3 4 14 13 5 6 11 15 12 v bg cvref cvset in+ in _ gnd za outia inop 7 8 gain vout vcc vref vset vo l t ag e r e f e r e nc e AM401 + _ op2 + _ op1 + _ ia figure 4 : application for current-driven sensing elements
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 13 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de example 3: input voltage (differential) of 0...100mv and output voltage range of 0...5v if v in = 0...100mv, r 1 / r 2 = 9, i s = 1.5ma v bg = 1.27v and i ref = 1ma the values of the external components are as follows: r 1 90k ? r 2 10k ? g ia = 5 c 1 = 2.2f c 2 = 10nf r set 846.7 ? r ref 5k ? application 3 ? differential input sign al, voltage output signal of 0.5...4.5v with applications which require an output voltage of 0.5...4.5v the pin used to configure the instrumentation amplifier offset ( za ) is connected to voltage v offset (figure 5). gain g is set using the two external resistors r 1 and r 2 : () 2 1 1 r r g g g g ia op ia + = = (2) the transfer function of output voltage v out is: v out = g v in + v offset (1) the offset voltage (equation 3) is calculated as: () vv r r vv r r vv vv offset bg ref bg ref bg bg offset =? ? ?= ? ? 4 3 3 4 using these equations the values of resistors r 1 and r 2 can be set as follows: r r vv gv out offset ia in 1 2 1 = ? ?
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 14 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de example 4: input voltage (differential) of 0...250mv and output voltage range of 0.5...4.5v if v in = 0...250mv, i ref 1ma, r 1 / r 2 = 2.2 and r 3 / r 4 = 4.8 the values of the external components are as follows: r 1 100k ? r 2 47k ? r 3 75k ? r 4 15.5k ? v offset = 0.5v c 1 = 2.2f c 2 = 10nf c 1 c 2 r 2 r 3 r 4 v offset r 1 ground v out v cc v in 1 2 3 4 14 13 5 6 11 15 12 v bg cvref cvset in+ in _ gnd za outia inop 7 8 gain vout vcc vref vset vo l t ag e r e f e r e nc e AM401 + _ op2 + _ op1 + _ ia figure 5 : application as a bridge amplifier for an output voltage of 0.5...4.5v
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 15 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de application 4 ? input voltage (referenced to ground) of 0...1v and output voltage of 0...10v for a signal of v in = 0...1v at the op1 input the external co mponents are to be dimensioned in such a way that there is an output voltage range of v out = 0...10v. using the values in equation 4 the settable gain has a value of: 10 v 1 v 10 max max 1 = = = in out op v v g where v in is the voltage at op1 input pin inop . according to equation 5 the below value is calcula ted for the resistance ratio of the adjustment resistors: 9 1 1 2 1 = ? = op g r r with reference to the boundary conditions for ex ternal components given on page 6 the following values are obtained: r 1 90k ? r 2 = 10k ? r ref = 5k ? c 1 = 2.2f c 1 r 2 r ref r 1 ground v out inop = in v cc 1 2 3 4 14 13 5 6 11 15 12 v bg cvref cvset in+ in _ gnd za outia inop 7 8 gain vout vcc vref vset vo l t ag e r e f e r e nc e AM401 + _ op2 + _ op1 + _ ia figure 6 : AM401 with an op input stage
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 16 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de v bg AM401 1 v in op2 connected as voltage ref erence v cvref r 4 r 3 op2 + _ 1 2 3 figure 7: AM401?s op2 as a voltage reference application 5 ? connecting up op2 as a voltage reference in addition to the integrated voltage reference of the AM401, the op2 can also be used as a voltage supply for external components, such as a/d converters or microprocessors, for example. lower voltages can be generated (e.g. 3.3v) which with the increasing miniaturisation of devices and need for ever lower levels of power dissipation in digital components is today of growing importance. if in addition to the 5/10v reference a further voltage source is required to power external components the second operational amplifier op2 can be used to this end. this operational amplifier can be easily configured as a voltage reference. using the circuit in figure 7 the following equation is given: ? ? ? ? ? ? ? ? + = ? ? ? ? ? ? ? ? + = 3 4 3 4 1 v 27 . 1 1 r r r r v v bg cvref (9) a voltage of v cvref = 3.3v is to be set. with reference to equation 9 the following ratio is obtained for the external resistors r 3 and r 4 : 6 . 1 1 6 . 2 1 3 4 = ? ? = bg cvref v v r r with reference to the boundary conditions for ex ternal components given on page 6 the following values are obtained for the resistors: r 3 = 10k ? r 4 = 16k ?
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 17 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de circuit topology topology of the 0...5/10v application topology of the 0.5...4.5v application 1234 5 67 8 9 10 11 12 13 14 15 16 AM401 n.c. n.c. n.c. c 1 c 2 r 1 r 2 v cc v out ground figure 8 : circuit topology of a 0...5/10v output 1234 5 67 8 9 10 11 12 13 14 15 16 AM401 n.c. n.c. n.c. c 1 c 2 r 1 r 2 r 4 r 3 v cc v out ground figure 9 : circuit topology of a 0.5...4.5v output
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 18 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de block diagram and pinout abbildung 11 : pinout AM401 1 2 3 4 14 13 5 6 11 15 12 v bg cvref cvset in+ in _ gnd za outia inop 7 8 gain vout vcc vref vset vo l t ag e r e f e r en c e AM401 + _ op2 + _ op1 + _ ia figure 10: block diagram of AM401 (individually configurable function modules) 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 cvref cvset in+ in- outia inop gain vout n.c. vref gnd za vset vcc n.c. n.c. figure 11: AM401 pin out pin name designation 1 cvref current/voltage reference 2 cvset current/voltage reference set 3 in+ positive input 4 in? negative input 5 outia instrumentation amplifier output 6 inop operational amplifier input 7 gain gain adjustment 8 vout voltage output 9 n.c. not connected 10 n.c. not connected 11 vcc supply voltage 12 vset voltage select 13 za zero adjustment (offset) 14 gnd ic ground 15 vref reference voltage 16 n.c. not connected table 1: pin out
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 19 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de example applications ? application as a voltage converter [3] ? application as an amplifier ic and impedance converter ? application as a processor interface AM401 v=6...35v cc 0...v -5v (adjustable) e.g. 0..5/10v cc protection agains t short circuiting and reverse polarity single-ended signal 0...v -5v cc figure 12: application as a voltage converter for signals referenced to ground v =6...35v cc 0...v -5v (adjustable) e.g. 0..5/10v cc protection against short circuiting and reverse polarity AM401 i=1,5ma figure 13: application as an amplifier ic and im pedance converter for differential signals v=6...35v cc 0...v -5v (adjustable) e.g. 0..5/10v cc protection against short circuiting and reverse polarity AM401 vref=5/10v d a figure 14: application as a processor interface
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 20 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de ? application as a processor periphery ic ? application as a front-end/back-end ic for microprocessors a d v ref = 5v v cv ref = 3.3v protection agains t short circuiting and reverse polarity AM401 p v =6...35v cc 0...v -5v (adjustable) e.g. 0..5/10v cc figure 15: application as a processor periphery ic v ref = 5v AM401 p i=1.5ma protection against short circuiting and reverse polarity v=6...35v cc 0...v -5v (adjustable) e.g. 0..5/10v cc figure 16: application as an analog front end and back end for microprocessors (the frame asic concept)
industrial voltage amplifier ic AM401 analog microelectronics mars 2006 analog microelectronics gmbh phone: +49 (0)6131/91 073 ? 0 21 / 21 an der fahrt 13, d ? 55124 mainz fax: +49 (0)6131/91 073 ? 30 rev. 2.3 internet: http://www.analogmicro .de email: info@analogmicro . de delivery AM401 is available as the following packages: ? 16-pin dil (samples, small series) ? so 16 (n): please see our website (data sheets: package.pdf) ? ssop 16: please see our website (data sheets: package.pdf) ? dice on 5? blue foil (on request) package dimensions please see our website (data sheets: package.pdf). further reading [1] the frame asic concept: http://www.frame-asic.de/ [2] the analog microelectronics gmbh website: http://www.analogmicro.de/ [3] available also for the AM401: applicati on notes an1013 on the analog microelectronics website: http://www.analogmicro.de/ analog microelectronics reserves the right to make amendments to any dimensions, technical data or other information contained herein without further notice.

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