AM411

AM411 WOLFSPEED | Alldatasheet

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Low-Cost Voltage Transmitter IC Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz March 2015 - Rev. 4.0 Phone:+49 (0)6131/91 0730-0 Fax: +49 (0)6131/91 073-30 Internet: www.analogmicro.de E–Mail: info@analogmicro.de Principle Function Industrial amplifier / transmitter IC for differential input voltages with integrated voltage reference and protection functions Typical Applications

• Universal voltage-transmitter with adjustable gain and offset
• Analog interface IC for differential input voltage signals
• Protected output stage for industrial applications (e.g. 0 .. 10 V)
• Interface and protection IC for microcontrollers
• Non-ratiometric sensor transmitter IC

Low-Cost Voltage Transmitter IC March 2015 - Rev. 4.0 Page 3/10 www.analogmicro.de

FEATURES

• supply voltage range: 6 .. 35 V
• operating temperature range: -40 °C .. +85 °C
• voltage reference: 5 V (max. 10 mA)
• differential input voltage range: V IN = 0 .. ±600 mV
• large common-mode input range: 1.5 .. 6.0 V
• output voltage up to 13 V
• adjustable gain and offset
• several integrated protection functions: - reverse polarity protection - protection against permutation of V CC , V OUT , GND - output current limitation - short circuit protection
• ESD protection
• REACH and RoHS conform GENERAL DESCRIPTION AM411 is a universal voltage amplifier / transmit- ter IC for signal-conditioning applications. It con - verts a differential input voltage into an amplifie d, single-ended output voltage. Using this IC stan- dardized industrial output voltage ranges (e.g. The IC consists of an instrumentation amplifier with adjustable offset as input stage and an op- erational amplifier output stage with adjustable gain. Offset and gain can be set using external resistors. A reference voltage source delivering 5 V with a source current up to 10 mA can be used to power external components (e.g. measurement bridges, microcontrollers). The IC is internally protected against reverse po- larity and permutation of V CC , V OUT and GND. Furthermore it is protected against short circuit o f VOUT by an integrated output current limitation. With its industrial voltage output, protection func - tions and wide input voltage range AM411 is suit- able for a large variety of transducers and sen- sors. BLOCK DIAGRAM Figure 1: AM411’s block diagram

Low-Cost Voltage Transmitter IC March 2015 - Rev. 4.0 Page 4/10 www.analogmicro.de SPECIFICATIONS 1. Electric Specifications Tamb = 25°C , VCC = 24 V, VREF = 5 V , IREF = 1 mA (unless otherwise noted) Parameter Symbol Conditions Min. Typ. Max. Unit System Supply Voltage VCC 6 24 35 V Quiescent Current ICC Tamb = -40 .. +85°C, I REF = 0 mA 1.5 mA Temperature Specifications Operating Temperature Tamb -40 85 °C Storage Tst -55 125 °C Junction TJ 150 °C Thermal Resistance Θja SO8 plastic package 140 °C/W Voltage Reference Voltage VREF 4.90 5.00 5.10 V Current IREF 0 10 mA VREF vs. Temperature dVREF /dT Tamb = -40 .. +85°C ±90 ±140 ppm/°C Line Regulation dV REF /dV VCC = 6V .. 35V, I REF = 1 mA 30 80 ppm/V dV REF /dV VCC = 6V .. 35V, I REF ≈ 5 mA 60 150 ppm/V Load Regulation dV REF /dI IREF = 1 mA 0.05 0.10 %/mA dV REF /dI IREF ≈ 5 mA 0.06 0.15 %/mA Load Capacitance CL 1.9 2.2 5.0 µF Instrumentation Amplifier (IA) Internal Gain GIA 4.9 5 5.1 Differential Input Voltage Range VIN 0 ±600 mV Common Mode Input Range CMIR VCC < 9 V, I CV < 2 mA 1.5 V CC - 3 V CMIR VCC ≥ 9 V, I CV < 2 mA 1.5 6.0 V Common Mode Rejection Ratio CMRR 80 90 dB Power Supply Rejection Ratio PSRR 77 90 dB Offset Voltage VOS -6.0 6.0 mV VOS vs. Temperatur dV OS /dT ±5 µV/°C Input Bias Current IB -300 nA IB vs. Temperature dI B/dT -0.9 nA/°C Zero Adjust Stage Internal Gain GZA 0.98 1.00 1.02 Input Voltage ZA VZA 0 3 V Offset Voltage V OS -3.0 2.0 mV VOS vs. Temperature dV OS /dT ±3 ±7 µV/°C Input Bias Current IB 100 nA IB vs. Temperature dI B/dT 75 pA/°C

Low-Cost Voltage Transmitter IC March 2015 - Rev. 4.0 Page 5/10 www.analogmicro.de Voltage Output Stage Adjustable Gain GOP 1 Power Supply Rejection Ratio PSRR 80 90 dB Offset Voltage VOS -2 2 mV VOS vs. Temperature dV OS /dT ±3 ±7 µV/°C Input Bias Current IB 5 12 nA IB vs. Temperature dIB/dV 3.5 10 pA/°C Output Voltage Range VOUT VCC < 18 V 0 VCC -5 V VOUT VCC ≥ 18 V 0 13 V Output Current IOUT 0 IOUT,max mA Maximum Output Current IOUT,max 5 mA Load Resistance RL 2 kΩ Protection Functions Protection against reverse polarity GND vs. V CC 35 V Protection against permutation GND vs. V CC vs. V OUT 35 V Short circuit protection of VOUT VOUT at GND. / V OUT at V CC,max 0 35 V System Parameters Nonlinearity Ideal input 0.03 0.1 % FS Notes: 1) Currents flowing into the IC are negative. Muss im Test geändert werden 2. Boundary Conditions Parameter Symbol Conditions Min. Typ. Max. Unit Sum Gain Resistors R1 + R 2 for GOP ≠ 1 20 200 k Ω Stabilization Capacitance @ V REF C1 -40 ≤ T amb ≤ 85°C 1.9 2.2 5.0 µF Table 1: AM411 's electric specifications Table 2: Boundary Conditions

Low-Cost Voltage Transmitter IC March 2015 - Rev. 4.0 Page 6/10 www.analogmicro.de

APPLICATION INFORMATION

1. Functional Principle AM411 is an integrated voltage amplifier / transmit ter, which can be used for the signal-conditioning of differ- ential voltage input signals. As shown in Figure 2 AM411 basically consists of three functional blocks: 1. An instrumentation amplifier with an internal ga in of GIA = 5 as input stage for a differential voltage input signal. Using pin ZA the instrumentation ampl ifier’s offset voltage can be adjusted / increased to accept negative differential voltage input signals. 1 2. An operational amplifier as output stage, whose gain can be adjusted using two external resistors R1 and R2. 3. A voltage reference generating a stable 5 V outp ut, which is able to source up to 10 mA and can be used to power external devices like microprocessors or sensors. It is essential to stabilize the refer - ence voltage with an external ceramic capacitor C1. This capacitor has to be connected even if the voltage reference is not used. Furthermore AM411 has a multitude of integrated protection functions, which satisfy industrial needs:

• AM411 is protected against reverse polarity (pin V CC at GND and pin GND at VCC )
• AM411’s output is protected against short circuit (pin VOUT at GND or pin VOUT at VCC ) by an inte- grated current limitation.
• The pins VOUT, VCC and GND are protected against p ermutation across the entire supply voltage range without the need for any additional external components.
• Except for the pins VOUT, VCC and GND all pins are protected by internal ESD diodes. 1 The pin ZA has to be connected to GND or to a voltage within VZA ’s input range at all times.

Low-Cost Voltage Transmitter IC March 2015 - Rev. 4.0 Page 7/10 www.analogmicro.de 2. Transfer Function AM411’s transfer function is given by: ( )ZA IN IA OP OUT VVGGV +⋅⋅= with 11 R RGOP += (1) with VOUT = output voltage VIN = differential input voltage VZA = voltage at pin ZA GIA = the instrumentation amplifier’s internal gain (GIA = 5) GOP = the output stage’s gain set by R 1 and R 2 R1, R 2 = external resistors used to adjust G OP (see Figure 2) 3. Choosing the supply voltage In principle AM411 can be used in the complete spec ified supply voltage range ( VCC = 6 .. 35 V ), but it has to be noted that for small supply voltages VCC ≤ 18 V the possible maximum output voltage VOUT,MAX is given by 2: VVV CC MAX OUT 5, −= (2) For example a supply voltage of VCC = 10 V limits the possible maximum output voltage to VOUT,MAX = 5 V . 4. Adjusting the system’s gain and offset As can be seen from equation (1) AM411’s gain can be adjusted using the external resistors R1 and R2 and a positive offset can be set using pin ZA 3. R1 and R2 can be calculated for a given system with a desire d maximum and minimum output voltage as well as a given maximum and minimum differential input v oltage using the following equation: ( ) 15 min ,max , min ,max , 1 −−⋅ IN IN OUT OUT VV VV R R (3) with VIN,min = minimum differential input voltage VIN,max = maximum differential input voltage VOUT,min = minimum output voltage VOUT,max = maximum output voltage Using VOUT,min the required voltage at pin ZA can be determined u sing equations (1) and (3) ( ) min ,min , min ,max , min ,max , 55 IN OUT OUT OUT IN IN ZA VVVV VVV ⋅−⋅− −⋅= (4) Please note, that for a positive differential input voltage signal, VIN ≥ 0 , a mimum output voltage VOUT,min = 0 V can only be achieved if the minimum input voltage VIN,min = 0 V and pin ZA is connected to GND . For a nega- tive differential or bidirectional differential inp ut voltage signals with VIN,min < 0 , a voltage VZA ≥ 5 · V IN,min at pin ZA is necessary for operation. Furthermore the bound ary conditions in Table 2 have to be respected during the dimensioning of R1 and R2. 2 For supply voltages VCC > 18 V the maximum output voltage VOUT,max cannot be larger than 13 V. 3 Please note, that only a positive offset can be set using pin ZA. Figure 2: AM411 with necessary external components

Low-Cost Voltage Transmitter IC March 2015 - Rev. 4.0 Page 8/10 www.analogmicro.de Example 1: Desired output voltage range 0 .. 5 V, input voltage range 0 .. 200 mV In the following example a differential input volta ge range of VIN = 0 .. 200 mV has to be amplified to an out- put voltage range of 0 .. 5 V . Because of the desired maximum output voltage VOUT,max = 5 V a minimum supply voltage of VCC,min = 10 V is needed. The dimensioning of the resistors R1 and R2 can be done using equation (3). With V IN,min = 0 V , VIN,max = 200 mV , VOUT,min = 0 V and VOUT,max = 5 V the following relation can be obtained from equation (3): 21 4 RR ⋅= Together with the boundary conditions given in Table 2 the following dimensioning of the external compo- nents can be obtained: R1 = 100 k Ω R 2 = 25 k Ω C 1 = 2.2 µF Example 2: Desired output voltage range 1 .. 5 V, input voltage range 0 .. 160 mV The circuit shown in Figure 3 can be used, if the system’s offset and gain have t o be adjusted. To generate VZA AM411’s voltage reference is used in combination w ith a voltage divider consisting of R3 and R4. Using equation (3) as well as V IN,min = 0 V , VIN,max = 160 mV , VOUT,min = 1 V and VOUT,max = 5 V the following relation can be obtained for R1 and R2: 21 4 RR ⋅= and with equation (4) the voltage at pin ZA can be calculated to VZA = 200 mV . Since VZA is adjusted using R3 and R4 and VREF = 5 V the following relation can be obtained: 3 −= ZA V V R R (5) With VZA = 200 mV this leads to R3 = 24 · R 4. Figure 3: AM411's external circuit for offset and gain adjustment

Low-Cost Voltage Transmitter IC March 2015 - Rev. 4.0 Page 9/10 www.analogmicro.de With IREF = 0.2 mA and the boundary conditions for R1 and R2 given in Table 2 the following dimensioning of the external components can be obtained: R1 = 100 k Ω R 2 = 25 k Ω R 3 = 24 k Ω R 4 = 1 k Ω C 1 = 2.2 µF Example 3: Desired output voltage range 0 .. 10 V, input voltage range -100 .. 100 mV In this example a differential input voltage range of VIN = -100 mV .. 100 mV will be amplified and offset ad- justed to an output voltage range of VOUT = 0 .. 10 V using the circuit shown in Figure 3. With VIN,min = -100 mV , VIN,max = 100 mV , VOUT,min = 0 V and VOUT,max = 10 V and equation (3) the following relation can be obtained for R1 and R2: 21 9 RR ⋅= and with equation (4) the voltage at pin ZA can be calculated to V ZA = 500 mV. Using equation (5) this leads to: 43 9 RR ⋅= With IREF = 0.16 mA ( < 10 mA ) and the boundary conditions for R1 and R2 given in Table 2 the following di- mensioning of the external components can be obtain ed: R1 = 27 k Ω R 2 = 3 k Ω R 3 = 27 k Ω R 4 = 3 k Ω C 1 = 2.2 µF 5. Operation Instructions The following points have to be considered while wo rking with AM411: 1. A high quality ceramic capacitor has to be conne cted at pin VREF, even if the reference voltage sou rce is not used. If AM411 is exposed to large temperatu re changes, special care must be taken that this ca - pacitor’s value stays inside the specified range (see Table 2). 2. The external resistors R1 and R2, which are used for gain adjustment, have to fullf ill the boundary condi- tion R1 + R 2 = 20 .. 200 k Ω. 3. Under normal operating conditions components pow ered using the voltage reference (pin VREF) may not drain more than 10 mA. 4. Generally only positive voltage offsets can be g enerated if a voltage is applied at pin ZA. If Pin ZA is not used it has to be connected to GND . 5. In general for positive differential input volta ge signals, VIN ≥ 0 , a mimum output voltage VOUT,min = 0 V can only be achieved if the minimum input voltage VIN,min = 0 V and VZA = 0 V . 6. For negative differential or bidirectional difff erential input voltage signals with VIN,min < 0 , a voltage VZA ≥ 5 · V IN,min is necessary for operation of AM411. 7. AM411’s output short circuit protection is reali zed by a continous current limitation of the output . The minimal threshold for the current limitation is 5 m A, leading to a thermal power deposition of 180 mW (at VCC = 36 V ), when no further components are powered by the IC . 8. AM411 is protected against reverse polarity and permutation of VOUT, VCC and GND. Please take care that components powered by VREF have to be protected seperately in case of reverse polarity or permu- tation of VCC versus GND . In general ESD precautions are necessary during ass embly and handling of the device. It is essential t o ground machines and personnel properly.

Low-Cost Voltage Transmitter IC March 2015 - Rev. 4.0 Page 10/10 www.analogmicro.de PACKAGE AND PINOUT The AM411’s standard packaging is a SO8 package (fo r dimensions please see the packaging catalog DELIVERY FORMS AM411 is available as: ORDER NUMBER DELIVERY FORM AM411-0-SO8 AM411 in an SO8(n) package AM411-WAF sawn 6“ wafer on blue foil AM411-Adapt AM411 soldered to an SO8-DIL8 adapter FURTHER LITERATURE 1. Package catalog (see www.analogmicro.de) 2. AM411 – Die Size and Padout (on request) 3. AM411 Application Notes (see www.analogmicro.de) NOTES PIN NAME BESCHREIBUNG

1 IN+ Non-inverting instrumentation amplifier input

2 IN- Inverting instrumentation amplifier input

3 GAIN Gain adjustment

4 VOUT Voltage output

5 VCC Supply voltage

6 ZA Zero adjust

7 GND IC Ground

8 VREF Reference voltage

Table 3: Pin assignment AM411 SO8 Package Analog Microelectronics GmbH reserves the right to amend any dimensions, technical data or other information contained herein without prior notification. Figure 4: Pinout AM402 SO8