AMPLIFIER AND PROTECTION IC
PRINCIPLE FUNCTION
Amplification of Single Ended Signals (Voltage)
Protection Functions for External Devices
Additional Adjustable Current/Voltage Source
AM461
V
CC
= 6...35V
Input voltage
single ended
V
OUT
= e.g. 0...5/10V
AM461
e.g. 0...1V, 0...5V
V
REF
= z.B. 5V or 3.3V
I
S
= 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:
–40°C...+85°C
•
Voltage Reference: 5V
•
Additional Voltage/Current Source
•
Operational Amplifier Stage with Inte-
grated 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 func-
tions. The IC contains of an externally adjustable
operational amplifier for conditioning of single
ended input signals. This amplifier has an inte-
grated output driver stage with the ability to source
up to 5mA without the need of any external tran-
sistor. 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 inte-
grated 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
V
BG
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
T
amb
= 25°C,
V
CC
= 24V,
I
REF
= 1mA,
C
1
= 2.2µF (unless otherwise noted)
Parameter
Voltage Range
Quiescent Current
Temperature Specifications
Operating
Storage
Junction
Thermal Resistance
T
amb
T
st
T
J
Θ
ja
Θ
ja
Voltage Reference
Voltage
Current
V
REF
vs. Temperature
Line Regulation
V
REF
I
REF
dV
REF
/dT
dV
REF
/dV
dV
REF
/dV
Load Regulation
dV
REF
/dI
dV
REF
/dI
Current/Voltage Source OP2
Internal Reference
V
BG
vs. Temperature
Current Source:
I
CV
=
V
BG
/R
SET
Adjustable Current Range
Output Voltage
I
CVREF
V
CVREF
V
CVREF
Voltage Source:
V
CV
=
V
BG
(1 +
R
4
/
R
3
)
Adjustable Voltage Range
V
CVREF
V
CVREF
Output Current
I
CVREF
I
CVREF
Load Capacitance @
CVREF
C
CVREF
V
CC
< 18V
V
CC
≥
18V
Source,
R
3
+
R
4
≥
100kΩ
Sink
Source mode
0
1
0.4
0.4
V
CC
< 18V
V
CC
≥
18V
0
V
BG
V
BG
V
BG
dV
BG
/dT
T
amb
= – 40...+85°C
1.20
1.27
±60
I
REF
≈
5mA
T
amb
= – 40...+85°C
V
CC
= 6V...35V
V
CC
= 6V...35V,
I
REF
≈
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
V
CC
I
CC
T
amb
= – 40...+85°C,
I
REF
= 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
V
CC
– 4
13
mA
V
V
V
CC
– 4
13
10
–100
10
V
V
mA
µA
nF
analog microelectronics
October 2002
4/8
AMPLIFIER AND PROTECTION IC
Parameter
Voltage Output Stage OP1
Adjustable Gain
Input Range
G
OP1
IR
IR
Power Supply Rejection Ratio
Offset Voltage
V
OS
vs. Temperature
Input Bias Current
I
B
vs. Temperature
Output Voltage Range
PSRR
V
OS
dV
OS
/dT
I
B
dI
B
/dT
V
OUT
V
OUT
Output Current Limitation
Output Current
Output Resistance
Load Resistance
Load Capacitance @
VOUT
Protection Functions
Protection against reverse polarity
Ground
vs.
V
CC
vs.
V
OUT
,
R
1
≥
20kΩ
I
LIM
I
OUT
R
OUT
R
L
C
L
V
CC
< 18V
V
CC
≥
18V
V
OUT
≥
10V,
R
1
+
R
2
≥
100kΩ
Source
Source
2
0
0
0
5
0
0.5
10
7
V
CC
< 10V
V
CC
≥
10V
1
0
0
80
90
±0.5
±3
5
3.5
Symbol
Conditions
Min.
Typ.
AM461
Max.
Unit
V
CC
– 5
5
V
V
dB
±2
±7
12
10
V
CC
– 5
13
10
I
LIM
100
500
mV
µV/°C
nA
pA/°C
V
V
mA
mA
Ω
kΩ
nF
35
V
Currents flowing into the IC are negative
BOUNDARY CONDITIONS
Parameter
Sum Gain Resistors
Sum Reference Adjustment Resistors
Stabilisation Capacitance @
VREF
Symbol
R
1
+
R
2
R
3
+
R
4
C
1
Conditions
Min.
20
20
1.9
Typ.
100
100
2.2
Max.
200
200
5.0
Unit
kΩ
kΩ
µF
analog microelectronics
October 2002
5/8
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