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AMPLIFIER AND PROTECTION IC
PRINCIPLE FUNCTION
Amplification of Single Ended Signals (Voltage) Protection Functions for External Devices Additional Adjustable Current/Voltage Source
AM461
VCC = 6...35V
Input voltage single ended
VOUT = e.g. 0...5/10V
AM461
e.g. 0...1V, 0...5V
VREF = z.B. 5V or 3.3V
IS = 1.5mA
TYPICAL APPLICATIONS
* * * * * Impedance Converter Adjustable Voltage Source Voltage Regulator with Additional Functions Protection IC for Microcontroller (Frame ASIC Concept [1]) Protected Current Source
analog microelectronics
Analog Microelectronics GmbH An der Fahrt 13, 55124 Mainz, Germany Internet: http://www.analogmicro.info Phone: Fax: E-mail: +49 (0)6131/91 073 - 0 +49 (0)6131/91 073 - 30 info@analogmicro.info
October 2002 1/8 Rev. 1.1
AMPLIFIER AND PROTECTION IC
TABLE OF CONTENTS
Features Description Block Diagram Electrical Specifications Block diagram and Pinout AM461 Principial Application Examples Delivery Additional Literature
AM461
3 3 3 4 6 7 8 8
TABLE OF FIGURES
Table1: Pinout AM461 Figure 1: Block diagram AM461 Figure 2: Block diagram AM461 Figure 3: Pinout AM461 Figure 4: Application as processor interface Figure 5: Application as amplifiers IC and impedance converter Figure 6: Application as voltage regulator and protection IC for controllers 6 3 6 6 7 7 7
analog microelectronics
October 2002 2/8
AMPLIFIER AND PROTECTION IC
FEATURES
* Supply Voltage Range: 6...35V * Wide Operating Temperature Range: -40C...+85C * Voltage Reference: 5V * Additional Voltage/Current Source * Operational Amplifier Stage with Integrated Driver Output * Adjustable Gain * Adjustable Output Voltage Range e.g. 0...5/10V, others * Reverse Polarity Protection * Short Circuit Protection * Output Current Limitation * Low-Cost: Replaces a Multitude Number of Discrete Components
AM461
DESCRIPTION
The AM461 is a universal useable amplifier and protection IC with a multitude of additional functions. The IC contains of an externally adjustable operational amplifier for conditioning of single ended input signals. This amplifier has an integrated output driver stage with the ability to source up to 5mA without the need of any external transistor. In addition, a voltage reference for the supply of external components and another operational amplifier that can be used as current/voltage source or comparator is integrated. Basic features of the IC are the wide range integrated of protection functions. The IC is protected against reverse polarity and has a build-in output current limitation. Using the amplifier IC AM461 it is possible to generate stable standard voltages ranges (e.g. 0-5/10V) in an easy and low-cost way.
BLOCK DIAGRAM
CVREF 1 8
VREF
AM461
CVSET 2
OP2
VBG INP 3
Voltage Reference
6
VCC
OP1
5 VOUT
7 GND INN
4
Figure 1: Block diagram AM461
analog microelectronics
October 2002 3/8
AMPLIFIER AND PROTECTION IC
ELECTRICAL SPECIFICATIONS
Tamb = 25C, VCC = 24V, IREF = 1mA, C1 = 2.2F (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 Current/Voltage Source OP2 Internal Reference VBG vs. Temperature Current Source: ICV = VBG/RSET Adjustable Current Range Output Voltage ICVREF VCVREF VCVREF Voltage Source: VCV = VBG (1 + R4 / R3) Adjustable Voltage Range VCVREF VCVREF Output Current ICVREF ICVREF Load Capacitance @ CVREF CCVREF VCC < 18V VCC 18V Source, R3 + R4 100k Sink Source mode 0 1 0.4 0.4 VCC < 18V VCC 18V 0 VBG VBG VBG dVBG/dT Tamb = - 40...+85C 1.20 1.27 60 IREF 5mA Tamb = - 40...+85C VCC = 6V...35V VCC = 6V...35V, IREF 5mA 4.75 1.0 90 30 60 0.05 0.06 5.00 DIL8 plastic package SO8 plastic package 110 180 -40 -55 Symbol VCC ICC Tamb = - 40...+85C, IREF = 0mA Conditions Min. 6 Typ.
AM461
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
V mA ppm/C ppm/V ppm/V %/mA %/mA
1.35 140
V ppm/C
10 VCC - 4 13
mA V V
VCC - 4 13 10 -100 10
V V mA A nF
analog microelectronics
October 2002 4/8
AMPLIFIER AND PROTECTION IC
Parameter Voltage Output Stage OP1 Adjustable Gain Input Range GOP1 IR IR 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 Output Resistance Load Resistance Load Capacitance @ VOUT Protection Functions Protection against reverse polarity Ground vs. VCC vs. VOUT, R1 20k ILIM IOUT ROUT RL CL VCC < 18V VCC 18V VOUT 10V, R1 + R2 100k Source Source 2 0 0 0 5 0 0.5 10 7 VCC < 10V VCC 10V 1 0 0 80 90 0.5 3 5 3.5 Symbol Conditions Min. Typ.
AM461
Max. Unit
VCC - 5 5
V V dB
2 7 12 10 VCC - 5 13 10 ILIM 100 500
mV V/C nA pA/C V V mA mA k nF
35
V
Currents flowing into the IC are negative
BOUNDARY CONDITIONS
Parameter Sum Gain Resistors Sum Reference Adjustment Resistors Stabilisation Capacitance @ VREF Symbol R1 + R2 R3 + R4 C1 Conditions Min. 20 20 1.9 Typ. 100 100 2.2 Max. 200 200 5.0 Unit k k F
analog microelectronics
October 2002 5/8
AMPLIFIER AND PROTECTION IC
BLOCK DIAGRAM AND PINOUT AM461
AM461
CVREF 1 8
VREF
AM461
CVSET 2
OP2
VBG INP 3
Voltage Reference
6
VCC
OP1
5 VOUT
7 GND INN
4
Figure 2: Block diagram AM461
PIN
NAME CVREF CVSET INP INN VOUT VCC GND VREF
DESIGNATION Output OP2 Input OP2 Positive input OP1 Negative input OP1 Voltage output Supply voltage IC ground Output voltage reference
CVREF CVSET INP INN
1 2 3 4
8 7 6 5
VREF GND VCC VOUT
Figure 3: Pinout AM461
1 2 3 4 5 6 7 8
Table1: Pinout AM461
analog microelectronics
October 2002 6/8
AMPLIFIER AND PROTECTION IC
PRINCIPLE APPLICATION EXAMPLES
* Application as processor interface
AM461
Reverse polarity and short circuit protection VCVREF = 3.3V VREF = 5V 6...35V
P
D
AM461
A
Figure 4: Application as processor interface
e.g. 0...5/10V
*
Application as amplifier IC and impedance converter
Reverse polarity and short circuit protection 6...35V
VIN = 0...1, 0...5V others
AM461
e.g. 0...5/10V
Figure 5: Application as amplifier IC and impedance converter
*
Application as voltage regulator and protection IC for controllers
6...35V Reverse polarity and short circuit protection
VREF = 5V
P
AM461
Figure 6: Application as voltage regulator and protection IC for controllers
analog microelectronics
October 2002 7/8
AMPLIFIER AND PROTECTION IC
DELIVERY
The AM461 amplifier and protection IC is available in * DIP08, SO08
AM461
ADDITIONAL LITERATURE
[1] [2] Concept of Frame ASICs: http://www.Frame-ASIC.com/ Analog Microelectronics` Homepage: http://www.analogmicro.info/
NOTES
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
October 2002 8/8

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