AM411 MINI | Alldatasheet

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VOLTAGE TRANSMITTER IC AM411 analog microelectronics April 99 Analog Microelectronics GmbH Phone: +49 (0)6131/91 073 – 0 1/6 An der Fahrt 13, D – 55124 Mainz Fax: +49 (0)6131/91 073 – 30 Rev. 2.1 Internet: www.analogmicro.de E–Mail: info@analogmicro .de

FEATURES

  • Wide Supply Voltage Range: 6...35V
  • Wide Operating Temperature Range: –40°C...+85°C
  • Voltage Reference: 5V
  • Instrumentation Amplifier Input (Reversible Polarity)
  • Operational Amplifier Input
  • Adjustable Gain and Offset
  • Adjustable Output Voltage Range:
  • Protection Against Reverse Polarity
  • Output Current Limitation

APPLICATIONS

  • Industrial Process Control
  • Sensor Transmitter (e.g. pressure)
  • Programmable Voltage Source GENERAL DESCRIPTION The AM411 is a monolithic voltage transmitter, designed for flexible bridge input signal condi- tioning. The integrated circuit is ideally suited for a wide variety of transducers with an differ- ential output signal. It contains a high accuracy instrumentation amplifier for differential input signals, an operational amplifier output stage, and a 5V reference. Output range and gain are adjustable by external resistors. Using the inter- nal instrumentation amplifier the AM411 is a standard sensor transmitter with the possibility to indicate an over range signal. With the inter- nal connected operational amplifier input this IC can be used as an adjustable voltage–to– voltage transmitter. DELIVERY
  • DIL8 packages (samples)
  • SOP8 packages
  • Dice on 5“ blue foil BLOCK DIAGRAM Reference Voltage IA GAIN VOUT VREF IN+ IN− AM411 GND VCC ZA Output Stage Figure 1

VOLTAGE TRANSMITTER IC AM411 analog microelectronics April 99 ELECTRICAL SPECIFICATIONS Tamb = 25°C, VCC = 24V, VREF = 5V, IREF = 1mA (unless otherwise noted) Parameter Symbol Conditions Min. Typ. Max. Unit Voltage Range VCC 63 5 V Quiescent Current ICC Tamb = – 40...+85°C, IREF = 0mA 1.5 mA Temperature Specifications Operating Tamb –40 85 °C Storage Tst –55 125 °C Junction TJ 150 °C Thermal Resistance Θja DIL8 plastic package 110 °C/W Θja SO8 plastic package 180 °C/W Voltage Reference Voltage VREF 4.75 5.00 5.25 V Current IREF 0.2 10.0 mA VREF vs. Temperature d VREF/dTT amb = – 40...+85°C ±90 ±140 ppm/°C Line Regulation d VREF/dVV CC = 6V...35V 30 80 ppm/V dVREF/dV VCC = 6V...35V, IREF ≈ 5mA 60 150 ppm/V Load Regulation d VREF/dI 0.05 0.10 %/mA dVREF/dI IREF ≈ 5mA 0.06 0.15 %/mA Load Capacitance CL 1.9 2.2 5.0 µF Instrumentation Amplifier Internal Gain GIA 4.9 5 5.1 Differential Input Voltage Range VIN 0 ±400 mV Common Mode Input Range CMIR V CC < 9V 1.5 VCC – 3 V CMIR VCC ≥ 9V 1.5 6.0 V Common Mode Rejection Ratio CMRR 80 90 dB Power Supply Rejection Ratio PSRR 80 90 dB Offset Voltage VOS ±1.5 ±6m V VOS vs. Temperature d VOS/dT ±5µ V / ° C Input Bias Current IB –120 –300 nA IB vs. Temperature d IB/dT –0.35 –0.8 nA/°C Output Voltage Range VOUTIA VCC < 9V, VOUTIA = GIA VIN + VZA 0.02 VCC – 3 V VOUTIA VCC ≥ 9V, VOUTIA = GIA VIN + VZA 0.02 6 V Load Capacitance CL 250 pF Zero Adjust Stage Internal Gain GZA 1 Input Voltage VZA VZA ≤ VOUTIA – GIA VIN 0 VOUTIA V Offset Voltage VOS ±0.5 ±2.0 mV VOS vs. Temperature d VOS/dT ±1.6 ±5µ V / ° C Input Bias Current IB 38 100 nA IB vs. Temperature d IB/dT 24 75 pA/°C Voltage Output Stage Adjustable Gain GOP 1 Input Range IR V CC < 10V 0 VCC – 5 V IR VCC ≥ 10V 05 V

VOLTAGE TRANSMITTER IC AM411 analog microelectronics April 99 Parameter Symbol Conditions Min. Typ. Max. Unit Voltage Output Stage (cont.) Power Supply Rejection Ratio PSRR 80 90 dB Offset Voltage VOS ±0.5 ±2m V VOS vs. Temperature d VOS/dT ±3 ±7µ V / ° C Input Bias Current IB 51 2 n A IB vs. Temperature d IB/dT 3.5 10 pA/°C Output Voltage Range VOUT VCC < 18V 0 VCC – 5 V VOUT VCC ≥ 18V 01 3 V Output Current Limitation ILIM VOUT ≥ 10V 57 1 0 m A Output Current IOUT 0 ILIM mA Load Resistance RL 2 kΩ Load Capacitance CL 500 nF Protection Functions Protection against reverse polarity Ground vs. VS vs. VOUT 35 V System Parameters Nonlinearity ideal input 0.05 0.15 %FS Currents flowing into the IC are negative BOUNDARY CONDITIONS Parameter Symbol Conditions Min. Typ. Max. Unit Sum Offset Resistors R3 + R4 20 200 kΩ VREF Capacitance C1 1.9 2.2 5.0 µF FUNCTIONAL DIAGRAM AMP Ground VS VOUT VIN Reference Voltage RIN RA RB Figure 2

VOLTAGE TRANSMITTER IC AM411 analog microelectronics April 99 FUNCTIONAL DESCRIPTION The IC AM411 is an integrated voltage transmitter for bridge input signals. With variations of a few external components the output voltage can be adjusted over a wide range. In addition to the resis- tors R 1 and R2 the circuitry needs only one external capacitor C1 for a basic application. Using the input of the voltage output stage the AM411 can be used for single ended input signals as well. Typical values for the external components are listed in the Application Notes. Basically the AM411 consists of 3 functional blocks as they are shown in Figure 1: 1. A high accuracy instrumentation amplifier with an internal gain G IA and the possibility to adjust the bias voltage (pin ZA) for differential input signals. 2. An operational amplifier output stage used for voltage transmission and as the voltage output. The output stage has an output current limitation protecting the IC. 3. A voltage reference can be used as an excitation for constant voltage sensors or as supply for other external devices. The transfer function for the output voltage of the instrumentation amplifier is: ZAINIAOUTIA VVGV += with the offset voltage VZA which can be adjusted on pin ZA. For die entire output voltage VOUT of the IC is valid INOPOPOUT VGV ⋅= with the adjustable gain GOP 1 += R RGOP The minimum supply voltage, which has to be adjusted, can be calculated over VS ≥ VOUTmax + 5V

VOLTAGE TRANSMITTER IC AM411 analog microelectronics April 99 PINOUT IN+ IN− GAIN VOUT VREF ZA VCC GND Figure 3 DELIVERY The AM411 is available in version:

  • DIL8 packages (samples)
  • SOP8 packages
  • Dice on 5“ blue foil PACKAGE DIMENSIONS SOP8 PIN NAME DESIGNATION

1 IN+ Non Inverting Bridge Input

2 IN– Inverting Bridge 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

0°-10°≥ 0,3 1,27 ≤ 2,00 4,98 ± 0,1 1,45 ± 0,1 0,2 ± 0,1 6,2 ± 0,2 4,0 + 0,2 - 0,1 0,2 ± 0,05 Figure 4

VOLTAGE TRANSMITTER IC AM411 analog microelectronics April 99 TYPICAL APPLICATION For Applications with an output signal of 0...5/10V zero adjust pin ZA has to be connected to IC Ground GND (Figure 5). The Gain G is adjusted by external resistors R1 and R2 and can be calcu- lated by OPIAGGG = The transfer function of the output voltage VOUT becomes VOUT = G VIN With this equations the external resistors R1 and R2 can be adjusted R R V GV OUT IA IN 1=− Example 1: Output voltage range 0...10V In this case the values of the external devices (VIN =05 0K mV , RR12 39= ) are as follows R1 ≈ 39kΩ R 2 ≈ 1kΩ GIA = 5 C1 = 2.2µF Example 2: Output voltage range 0...5V In this case the values of the external devices (VIN = 0 100K mV , RR12 9= ) are as follows R1 ≈ 90kΩ R 2 ≈ 10kΩ GIA = 5 C1 = 2.2µF Reference Voltage IA AM411 Output Stage VS VOUT Ground Figure 5 The information provided herein is believed to be reliable; however, Analog Microelectronics assumes no responsibility for inaccuracies or omissions. Analog Microelectronics assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change without notice. No patent rights or licences to any of the circuits described herein are implied or granted to any third party. Analog Microelectronics does not authorise or warrant any Analog Microelectronics product use in life support devices and/or systems.