INDUSTRIAL VOLTAGE AMPLIFIER IC AM401 PRINCIPLE FUNCTION

Transcription

1 PINCIPLE FUNCTION Amplification and conversion of differential signals referenced to ground to adjustable industrial voltages (0...Vcc-5V, e.g /10V etc.) Variable current/voltage source and integrated protective circuitry V = 6 35V Differential input voltage 00mV Single-ended input voltage 0...5V V OUT = 0...V - 5V adjustable e.g V V = 5/10V EF I = mA S 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 analog microelectronics March 006 Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

2 CONTENTS GENEAL DESCIPTION...3 BLOCK DIAGAM...3 ELECTICAL SPECIFICATIONS... BOUNDAY CONDITIONS...6 DETAILED DESCIPTION OF FUNCTIONS...7 s transfer function... 8 Setting the instrumentation amplifier... 8 Setting the voltage amplification... 9 Selecting the supply voltage... 9 Points to note: initial operation of APPLICATIONS...10 Application 1 Differential input signal, voltage output signal of 0...5/10V Application Voltage output signal of 0...5/10V, current-driven sensing element Application 3 Differential input signal, voltage output signal of V Application Input voltage (referenced to ground) of 0...1V and output voltage of V Application 5 Connecting up OP as a voltage reference CICUIT TOPOLOGY...10 Topology of the 0...5/10V application Topology of the V application BLOCK DIAGAM AND PINOUT...10 EXAMPLE APPLICATIONS...10 DELIVEY...10 PACKAGE DIMENSIONS...10 FUTHE EADING...10 Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

3 FEATUES Supply voltage range: V Wide operating temperature range: 0 C...85 C Adjustable voltage reference: 5 to 10V Additional current/voltage source Instrumentation amplifier input CMVI: Vcc-3V Operational amplifier input Vin: 0...Vcc-5V Adjustable gain and offset Adjustable output voltage range: 0...Vcc-5V, e.g V, 0...5/10V Individually configurable function modules Protection against reverse polarity Output current limitation Short-circuit protection Protection against ESD ohs compliant GENEAL DESCIPTION and P [] 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, 0.5.5V) can be easily generated using transmitter ICs and P. BLOCK DIAGAM CVSET V BG _ OP CVEF 1 VSET VEF 1 15 Voltage eference 11 V IN IN _ 3 _ IA _ OP1 8 VOUT GND ZA OUTIA INOP GAIN Figure 1: Block diagram of (individually configurable function) analog microelectronics March 006 Analog Microelectronics GmbH Telefon: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Telefax: 9 (0)6131/ ev..3 Internet: E Mail: info@analogmicro.de

4 ELECTICAL SPECIFICATIONS T amb = 5 C, V = V, V EF = 5V, I EF = 1mA (unless otherwise stated) Parameter Symbol Conditions Min. Typ. Max. Unit Voltage ange V 6 35 V Quiescent Current I T amb = C, I EF = 0mA 1.5 ma Temperature Specifications Operating T amb 0 85 C Storage T st C Junction T J 150 C Thermal esistance Θ ja DIL16 plastic package 70 C/W Θ ja SSOP plastic package 10 C/W Θ ja SO16 narrow plastic package 10 C/W Voltage eference Voltage V EF VSET not connected V V EF VSET = GND, V 11V V Current I EF ma V EF vs. Temperature dv EF /dt T amb = C ±90 ±10 ppm/ C Line egulation dv EF /dv V = 6V...35V ppm/v dv EF /dv V = 6V...35V, I EF 5mA ppm/v Load egulation dv EF /di %/ma dv EF /di I EF 5mA %/ma Load Capacitance C L µf Current/Voltage Source (OP) Internal eference V BG V V BG vs. Temperature dv BG /dt T amb = C ±60 ±10 ppm/ C Current Source: I CV = V BG / EXT (see page 10 for details) Adjustable Current ange I CV 0 10 ma Output Voltage V CV V < 18V V BG V 5 V V CV V 18V V BG 13 V Voltage Source: V CV = V BG (1 / 3 ) (see page 13 for details) Adjustable Voltage ange V CV V < 18V 0. V 5 V V CV V 18V V Output Current I CV Source 10 ma I CV Sink 100 µa Load Capacitance C L Source mode nf Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

5 ELECTICAL SPECIFICATIONS Parameter Symbol Conditions Min. Typ. Max. Unit Instrumentation Amplifier (IA) Internal Gain G IA Differential Input Voltage ange V IN 0 ±00 mv Common Mode Input ange CMI V < 9V, I CV < ma 1.5 V 3 V CMI V 9V, I CV < ma V Common Mode ejection atio CM db Power Supply ejection atio PS db Offset Voltage V OS ±1.5 ±6 mv V OS vs. Temperature dv OS /dt ±5 µv/ C Input Bias Current I B na I B vs. Temperature di B /dt na/ C Output Voltage ange* V OUTIA V < 9V, LIA 10kΩ 0* V 3 V V OUTIA V 9V, LIA 10kΩ 0* 6 V Minimum Output Voltage V OUTIAmin Without external load resistance LIA 5 17 mv Load Capacitance C L 50 pf Instrumentation Amplifier (IA) P Internal Gain G IA Differential Input Voltage ange V IN 0 ±00 mv Common Mode Input ange CMI V < 9V, I CV < ma 1.5 V 3 V CMI V 9V, I CV < ma V Common Mode ejection atio CM db Power Supply ejection atio PS db Offset Voltage V OS ±1,5 mv V OS vs. Temperature dv OS /dt ±5 µv/ C Input Bias Current I B na I B vs. Temperature di B /dt na/ C Output Voltage ange* V OUTIA V < 9V, LIA 10kΩ 0* V 3 V V OUTIA V 9V, LIA 10kΩ 0* 6 V Minimum Output Voltage V OUTIAmin Without external load resistance LIA 5 17 mv Load Capacitance C L 50 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 ±.0 mv V OS vs. Temperature dv OS /dt ±1.6 ±5 µv/ C Input Bias Current I B na I B vs. Temperature di B /dt 75 pa/ C Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

6 ELECTICAL SPECIFICATIONS Parameter Symbol Conditions Min. Typ. Max. Unit Voltage Output Stage (OP1) Adjustable Gain G OP 1 Input ange I V < 10V 0 V 5 V I V 10V 0 5 V Power Supply ejection atio PS db Offset Voltage V OS ±0.5 ± mv V OS vs. Temperature dv OS /dt ±3 ±7 µv/ C Input Bias Current I B 5 1 na I B vs. Temperature di B /dt pa/ C Output Voltage ange V OUT V < 18V 0 V 5 V V OUT V 18V 0 13 V Output Current Limitation I LIM V OUT 10V ma Output Current I OUT 0 I LIM ma Load esistance L kω Load Capacitance C L 500 nf Protection Functions Protection against reverse polarity Ground vs. V S vs. V OUT 1 0 kω 35 V Output current limitation I LIM V OUT 10V 10 ma System Parameters Nonlinearity Ideal input %FS * Depending on external load resistance at output IA ( LIA 10kΩ V OUTIA < 3mV); internal load resistance is 100kΩ Currents flowing into the IC are negative BOUNDAY CONDITIONS Parameter Symbol Conditions Min. Typ. Max. Unit Sum Gain esistors kω Sum eference Adjustment esistors kω Stabilization V EF C µf V IA Capacitance C pf IMPOTANT CONDITION: *The reference output always has to source 1mA. Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

7 DETAILED DESCIPTION OF FUNCTIONS 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 accessible, enabling them to be used as functional units or, using the relevant external circuitry, configured as an application-specific device. Typical applications and values for external components are given in the examples described in the following. In essence consists of functional blocks as shown in Figure 1. The individual blocks are as follows: 1. The core element of 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.. There is also an operational amplifier stage (OP1). OP1 s gain of G OP1 can be set using external resistors 1 and (see Figure ). The operational amplifier 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 transistor 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. s voltage reference permits voltage to be supplied by external components (such as sensors, microprocessors, etc.). The reference voltage V EF 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 ).. An additional operational amplifier (OP) can be used as a current or voltage source for the supply of external components. OP 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 applications can be found on the following pages. The operational amplifier output has a sufficiently high drive power. One of s main features is its range of integrated protective circuits which make the IC an effective output stage. Pins VOUT, V 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, V and GND) are protected by internal ESD diodes. Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

8 s transfer function In compliance with Figure the transfer function for when used as an amplifier for differential signals with a voltage output is: OUT OP ( G V V ) V = G (1) where: G G G = G ( 1 ) IA IN ZA = IA OP IA 1 () C 1 3 V OFFSET A CVSET V BG _ OP 1 CVEF 1 15 VSET VEF Voltage eference V 11 V IN V IN 3 IN IN IA _ OP1 VOUT 8 V OUT B GND ZA OUTIA INOP GAIN C 1 Ground Figure : The general functions of Setting the instrumentation amplifier The transfer function of the instrumentation amplifier is determined by: V = G V V OUTIA IA IN ZA with an offset voltage of V ZA which can be set at pin ZA. With the circuitry shown in Figure and using the additional operational amplifier the offset voltage is determined thus: Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

9 V OFFSET = V BG 3 ( V V ) EF The following applies to the IC s actual output voltage V OUT (transfer function of OP1): BG (3) V OUT = G V () OP INOP with an adjustable gain of G OP : G = 1 OP 1 (5) Setting the voltage amplification The gain of operational amplifier stage OP1 can be set using the suitably selected external resistors 1 and. If OP1 is connected up as a non-inverting amplifier (see: Figure) output voltage V OUT at pin VOUT is calculated as follows: V OUT 1 = V G with = 1 IN OP1 G OP 1 where V IN is the voltage at OP1 s input pin INOP. Selecting the supply voltage In principle 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 : When using voltage output pin VOUT the IC s minimum supply voltage V necessary for the operation of the device depends on the maximum output voltage V OUTmax required by the application. The following applies: V V OUT max 5V (6) If the additional operational amplifier OP is used as a voltage reference or current source, the minimum supply voltage selected (V ) depends on the maximum voltage at pin CVEF. The following applies: V V CVEF max 5V (7) When using pin VOUT and operational amplifier OP as a voltage reference or current source the higher value of Vcc must be set. Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

10 C 1 Ground INDUSTIAL VOLTAGE AMPLIFIE IC Points to note: initial operation of 1. When operating it is imperative that 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 EF = 10mA.. All of the function blocks not used by the application (e.g. OP) 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 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 kω. The values of external resistors 1,, 3 and must be selected so that they lie within the permitted range specified in the boundary conditions on. C 1 CVSET V BG _ OP 1 CVEF 1 15 VSET VEF Voltage eference V 11 V 3 IN IN IA _ OP1 VOUT 8 V OUT GND ZA OUTIA INOP GAIN Figure 3: used as an industrial bridge amplifier Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

11 APPLICATIONS Application 1 Differential input signal, 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 1 and : ( 1 ) G = GIA GOP = GIA 1 () If no offset voltage is present, the transfer function of the output voltage (Gl.1) is: V OUT = G V IN Using these equations the values of resistors 1 and can be set as follows: 1 VOUT = 1 G V IA IN Example 1: Input voltage (differential) of mV and output voltage range of V If V IN = mV, 1 / = 39 and I EF 1mA the values of the external components are as follows: 1 117kΩ 3kΩ G IA = 5 C 1 =.µf C = 10nF Example : Input voltage (differential) of mV and output voltage range of 0...5V If V IN = mV, 1 / = 9 and I EF 1mA the values of the external components are as follows: 1 90kΩ 10kΩ G IA = 5 C 1 =.µf C = 10nF Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

12 Application Voltage output signal of 0...5/10V, current-driven sensing element EF C 1 CVSET V BG _ OP 1 CVEF 1 15 VSET VEF Voltage eference V 11 V SET V IN 3 IN IN IA _ OP1 VOUT 8 V OUT GND ZA OUTIA INOP GAIN C 1 Ground Figure : Application for current-driven sensing elements 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 calculated 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 1 and : ( 1 ) G = GIA GOP = GIA 1 () If no offset voltage is present, the transfer function of the output voltage (Gl.1) is: V OUT = G V IN (1) Using these equations the values of resistors 1 and can be set as follows: 1 V = G V OUT IA IN 1 Supply current I S for the sensor bridge can be determined using resistance SET : I S VBG = (8) SET Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

13 Example 3: Input voltage (differential) of mV and output voltage range of 0...5V If V IN = mV, 1 / = 9, I S = 1.5mA V BG = 1.7V and I EF = 1mA the values of the external components are as follows: 1 90kΩ 10kΩ G IA = 5 C 1 =.µf C = 10nF SET 86.7Ω EF 5kΩ Application 3 Differential input signal, voltage output signal of V With applications which require an output voltage of V 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 1 and : ( 1 ) G = GIA GOP = GIA 1 () 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: V V ( ) V V 3 OFFSET = BG EF BG = 3 V V BG V V EF BG OFFSET Using these equations the values of resistors 1 and can be set as follows: 1 = V OUT V G V IA OFFSET IN 1 Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

14 C 1 3 V OFFSET CVSET V BG _ OP 1 CVEF 1 15 VSET VEF Voltage eference V 11 V V IN 3 IN IN IA _ OP1 VOUT 8 V OUT GND ZA OUTIA INOP GAIN C 1 Ground Figure 5: Application as a bridge amplifier for an output voltage of V Example : Input voltage (differential) of mV and output voltage range of V If V IN = mV, I EF 1mA, 1 / =. and 3 / =.8 the values of the external components are as follows: 1 100kΩ 7kΩ 3 75kΩ 15.5kΩ V OFFSET = 0.5V C 1 =.µf C = 10nF Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

15 Application Input voltage (referenced to ground) of 0...1V and output voltage of V EF C 1 CVSET V BG _ OP 1 CVEF 1 15 VSET VEF Voltage eference V 11 V 3 IN IN IA _ OP1 VOUT 8 V OUT GND ZA OUTIA INOP GAIN Ground Figure 6: with an OP input stage INOP = IN For a signal of V IN = 0...1V at the OP1 input the external components are to be dimensioned in such a way that there is an output voltage range of V OUT = V. Using the values in Equation the settable gain has a value of: G V 10V = 1V OUT max OP1 = = VIN max 10 where V IN is the voltage at OP1 input pin INOP. According to Equation 5 the below value is calculated for the resistance ratio of the adjustment resistors: 1 1 = G OP 1 = 9 With reference to the boundary conditions for external components given on page 6 the following values are obtained: 1 90kΩ = 10kΩ EF = 5kΩ C 1 =.µf Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

16 Application 5 Connecting up OP as a voltage reference OP connected as voltage reference V IN 3 3 _ OP V BG 11 V CVEF Figure 7: s OP as a voltage reference In addition to the integrated voltage reference of the, the OP 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 OP 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: = = V V V 1 (9) CVEF BG 3 3 A voltage of V CVEF = 3.3V is to be set. With reference to Equation 9 the following ratio is obtained for the external resistors 3 and : VCVEF = = V BG With reference to the boundary conditions for external components given on page 6 the following values are obtained for the resistors: 3 = 10kΩ = 16kΩ Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

17 CICUIT TOPOLOGY Topology of the 0...5/10V application V C 1 N.C. N.C. N.C V OUT C 1 Ground Figure 8: Circuit topology of a 0...5/10V output Topology of the V application C 1 V N.C. N.C. N.C V OUT 3 1 C Ground Figure 9: Circuit topology of a V output Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

18 BLOCK DIAGAM AND PINOUT CVSET V BG _ OP CVEF 1 VSET VEF 1 15 Voltage eference 11 V IN IN _ 3 _ IA _ OP1 8 VOUT GND ZA OUTIA INOP 7 GAIN Figure 10: Block diagram of (individually configurable function modules) PIN NAME DESIGNATION 1 CVEF Current/Voltage eference CVSET Current/Voltage eference Set 3 IN Positive Input 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 V Supply Voltage 1 VSET Voltage Select 13 ZA Zero Adjustment (Offset) Abbildung 1 GND 11: Pinout IC Ground 15 VEF eference Voltage 16 N.C. Not Connected Table 1: Pin out CVEF CVSET IN IN- OUTIA INOP GAIN VOUT Figure 11: Pin out N.C. VEF GND ZA VSET V N.C. N.C. Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

19 EXAMPLE APPLICATIONS Application as a voltage converter [3] V =6...35V Protection against short circuiting and reverse polarity Single-ended signal 0...V -5V 0...V -5V (adjustable) e.g. 0..5/10V Figure 1: Application as a voltage converter for signals referenced to ground Application as an amplifier IC and impedance converter I=1,5mA V =6...35V Protection against short circuiting and reverse polarity 0...V -5V (adjustable) e.g. 0..5/10V Figure 13: Application as an amplifier IC and impedance converter for differential signals Application as a processor interface VEF=5/10V D A V =6...35V 0...V -5V (adjustable) e.g. 0..5/10V Protection against short circuiting and reverse polarity Figure 1: Application as a processor interface Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

20 Application as a processor periphery IC V CV EF = 3.3V V EF = 5V V =6...35V Protection against short circuiting and reverse polarity µp D A 0...V -5V (adjustable) e.g. 0..5/10V Figure 15: Application as a processor periphery IC Application as a front-end/back-end IC for microprocessors I=1.5mA V =6...35V Protection against short circuiting and reverse polarity 0...V -5V (adjustable) e.g. 0..5/10V V EF = 5V µp Figure 16: Application as an analog front end and back end for microprocessors (the Frame ASIC concept) Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3

21 DELIVEY 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). FUTHE EADING [1] The Frame ASIC concept: [] The Analog Microelectronics GmbH website: [3] Available also for the : Application notes AN1013 on the Analog Microelectronics website: Analog Microelectronics reserves the right to make amendments to any dimensions, technical data or other information contained herein without further notice. Analog Microelectronics GmbH Phone: 9 (0)6131/ /1 An der Fahrt 13, D 551 Mainz Fax: 9 (0)6131/ ev..3