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VOLTAGE TRANSMITTER IC
FEATURES
* Wide Supply Voltage Range: 6...35V * Wide Operating Temperature Range: -40C...+85C * Voltage Reference: 5V * Instrumentation Amplifier Input (Reversible Polarity) * Operational Amplifier Input * Adjustable Gain and Offset * Adjustable Output Voltage Range: 0.5...4.5V, 0...5/10V, other * Protection Against Reverse Polarity * Output Current Limitation
AM411
GENERAL DESCRIPTION
The AM411 is a monolithic voltage transmitter, designed for flexible bridge input signal conditioning. The integrated circuit is ideally suited for a wide variety of transducers with an differential 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 internal instrumentation amplifier the AM411 is a standard sensor transmitter with the possibility to indicate an over range signal. With the internal connected operational amplifier input this IC can be used as an adjustable voltage-to- voltage transmitter.
APPLICATIONS
* Industrial Process Control * Sensor Transmitter (e.g. pressure) * Programmable Voltage Source
DELIVERY
* DIL8 packages (samples) * SOP8 packages * Dice on 5" blue foil
BLOCK DIAGRAM
ZA 6
VREF 8 5 Reference Voltage VCC
AM411
1 IN+ IN- 2 IA Output Stage 4 VOUT
3 GAIN
7 GND
Figure 1
analog microelectronics
Analog Microelectronics GmbH An der Fahrt 13, D - 55124 Mainz Internet: www.analogmicro.de Phone: +49 (0)6131/91 073 - 0 Fax: +49 (0)6131/91 073 - 30 E-Mail: info@analogmicro.de
April 99 1/6 Rev. 2.1
VOLTAGE TRANSMITTER IC
ELECTRICAL SPECIFICATIONS
Tamb = 25C, VCC = 24V, VREF = 5V, IREF = 1mA (unless otherwise noted)
Parameter Voltage Range Quiescent Current Temperature Specifications Operating Storage Junction Thermal Resistance Tamb Tst TJ ja ja Voltage Reference Voltage Current VREF vs. Temperature Line Regulation VREF IREF dVREF/dT dVREF/dV dVREF/dV Load Regulation dVREF/dI dVREF/dI Load Capacitance Instrumentation Amplifier Internal Gain Differential Input Voltage Range Common Mode Input Range GIA VIN CMIR CMIR Common Mode Rejection Ratio Power Supply Rejection Ratio Offset Voltage VOS vs. Temperature Input Bias Current IB vs. Temperature Output Voltage Range CMRR PSRR VOS dVOS/dT IB dIB/dT VOUTIA VOUTIA Load Capacitance Zero Adjust Stage Internal Gain Input Voltage Offset Voltage VOS vs. Temperature Input Bias Current IB vs. Temperature Voltage Output Stage Adjustable Gain Input Range GOP IR IR VCC < 10V VCC 10V 1 0 0 GZA VZA VOS dVOS/dT IB dIB/dT VZA VOUTIA - GIA VIN 0 0.5 1.6 38 24 1 CL VCC < 9V, VOUTIA = GIA VIN + VZA VCC 9V, VOUTIA = GIA VIN + VZA 0.02 0.02 VCC < 9V VCC 9V 4.9 0 1.5 1.5 80 80 90 90 1.5 5 -120 -0.35 5 CL IREF 5mA 1.9 Tamb = - 40...+85C VCC = 6V...35V VCC = 6V...35V, IREF 5mA 4.75 0.2 90 30 60 0.05 0.06 2.2 5.00 DIL8 plastic package SO8 plastic package 110 180 -40 -55 Symbol VCC ICC Tamb = - 40...+85C, IREF = 0mA Conditions Min. 6 Typ.
AM411
Max. 35 1.5
Unit V mA
85 125 150
C C C C/W C/W
5.25 10.0 140 80 150 0.10 0.15 5.0
V mA ppm/C ppm/V ppm/V %/mA %/mA F
5.1 400 VCC - 3 6.0 mV V V dB dB 6 mV V/C -300 -0.8 VCC - 3 6 250 nA nA/C V V pF
VOUTIA 2.0 5 100 75
V mV V/C nA pA/C
VCC - 5 5
V V
analog microelectronics
April 99 2/6
VOLTAGE TRANSMITTER IC
Parameter Voltage Output Stage (cont.) Power Supply Rejection Ratio Offset Voltage VOS vs. Temperature Input Bias Current IB vs. Temperature Output Voltage Range PSRR VOS dVOS/dT IB dIB/dT VOUT VOUT Output Current Limitation Output Current Load Resistance Load Capacitance Protection Functions Protection against reverse polarity System Parameters Nonlinearity ideal input 0.05 Ground vs. VS vs. VOUT ILIM IOUT RL CL VCC < 18V VCC 18V VOUT 10V 0 0 5 0 2 7 80 90 0.5 3 5 3.5 Symbol Conditions Min. Typ.
AM411
Max. Unit
dB 2 7 12 10 VCC - 5 13 10 ILIM 500 mV V/C nA pA/C V V mA mA k nF
35
V
0.15
%FS
Currents flowing into the IC are negative
BOUNDARY CONDITIONS
Parameter Sum Offset Resistors VREF Capacitance Symbol R3 + R4 C1 Conditions Min. 20 1.9 2.2 Typ. Max. 200 5.0 Unit k F
FUNCTIONAL DIAGRAM
Reference Voltage
RA VOUT VS
VIN
RIN
AMP
RB
Ground
Figure 2
analog microelectronics
April 99 3/6
VOLTAGE TRANSMITTER IC
FUNCTIONAL DESCRIPTION
AM411
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 resistors R1 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 GIA 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: VOUTIA = G IAVIN + VZA with the offset voltage VZA which can be adjusted on pin ZA. For die entire output voltage VOUT of the IC is valid VOUT = GOP VINOP with the adjustable gain GOP GOP = R1 +1 R2
The minimum supply voltage, which has to be adjusted, can be calculated over VS VOUTmax + 5V
analog microelectronics
April 99 4/6
VOLTAGE TRANSMITTER IC
PINOUT
PIN NAME IN+ IN- GAIN VOUT VCC ZA GND VREF
AM411
DESIGNATION Non Inverting Bridge Input Inverting Bridge Input Gain Adjustment Voltage Output Supply Voltage Zero Adjust IC Ground Reference Voltage
IN+ IN- GAIN VOUT
1 2 3 4
8 7 6 5
VREF GND ZA VCC
1 2 3 4 5 6 7 8
Figure 3
DELIVERY
The AM411 is available in version: * DIL8 packages (samples) * SOP8 packages * Dice on 5" blue foil
PACKAGE DIMENSIONS SOP8
4,98 0,1 1,45 0,1 0,2 0,05 0,2 0,1 0,42 0,07 1,27 0,635 0,3 0-10 6,2 0,2 4,0 + 0,2 - 0,1
2,00
8
1
4
Figure 4
analog microelectronics
April 99 5/6
VOLTAGE TRANSMITTER IC
TYPICAL APPLICATION
AM411
C1
8
AM411
Reference Voltage 1 IA 2 Output Stage 4 R1 7 6 3 R2 5
VS
VOUT
Ground
Figure 5 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 calculated by G = G IA GOP The transfer function of the output voltage VOUT becomes VOUT = G VIN With this equations the external resistors R1 and R2 can be adjusted V R1 = OUT -1 R2 GIA VIN Example 1: Output voltage range 0...10V In this case the values of the external devices ( VIN = 0K50 mV , R1 R2 = 39 ) are as follows R1 39k R2 1k GIA = 5 C1 = 2.2F
Example 2: Output voltage range 0...5V In this case the values of the external devices (VIN = 0K100mV , R1 R2 = 9 ) are as follows R1 90k R2 10k GIA = 5 C1 = 2.2F
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.
analog microelectronics
April 99 6/6

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