Industrial V/I Converter and Protector IC
AM462
PRINCIPLE FUNCTION
Conversion of input voltage referenced to ground to output current
Integrated protection for IC and external components
Integrated, adjustable current/voltage sources for external components
V
CC
= 6...35V
Single-ended
input voltage
0...V
CC
-5V
AM462
I
OUT
= e.g. 0/4...20mA
V
REF
= 5/10V
I
CC
= up to 10mA
TYPICAL APPLICATIONS
•
•
•
•
•
•
Adjustable voltage-to-current (V/I) converter
Adjustable voltage and current source (supply unit)
Voltage regulator with additional functions
Industrial protector and output IC for microprocessors (the Frame ASIC concept [1])
Peripheral processor IC
For examples of typical applications see
Example Applications
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: http://www.analogmicro.de
Phone:
Fax:
Email:
+49 (0)6131/91 073 - 0
+49 (0)6131/91 073 – 30
info@analogmicro.de
December2006
1/20
Rev. 2.4
Industrial V/I Converter and Protector IC
AM462
CONTENTS
CONTENTS
FEATURES
GENERAL DESCRIPTION
BLOCK DIAGRAM
ELECTRICAL SPECIFICATIONS
BOUNDARY CONDITIONS
DETAILED DESCRIPTION OF FUNCTIONS
INITIAL OPERATION OF AM462
General information on 2- and 3-wire applications and the use of current
Setting the output current range
Selecting the supply voltage
Using OP2 as a current source
Using OP2 as a voltage reference
2
3
3
3
4
6
6
6
6
6
6
6
6
POINTS TO NOTE: INITIAL OPERATION OF AM462
APPLICATIONS
Typical 3-wire application with an input signal referenced to ground
Typical 2-wire application with an input signal referenced to ground
Application for an input signal with an offset
6
6
6
6
6
BLOCK DIAGRAM AND PINOUT
EXAMPLE APPLICATIONS
DELIVERY
PACKAGE DIMENSIONS
FURTHER READING
6
6
6
6
6
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: http://www.analogmicro.de
Phone:
Fax:
Email:
+49 (0)6131/91 073 - 0
+49 (0)6131/91 073 – 30
info@analogmicro.de
December2006
2/20
Rev. 2.4
Industrial V/I Converter and Protector IC
AM462
FEATURES
•
Supply voltage: 6...35V
•
Wide working temperature range:
–40°C...+85°C
•
Adjustable integrated reference voltage
source: 4.5 to 10V
•
Additional voltage/current source
•
Adjustable amplification
•
Adjustable offset
•
Industrial current output (e.g.
0/4...20mA)
•
Protection against reverse polarity
•
Short-circuit protection
•
Output current limitation
•
Low-cost device: replaces a number of
discrete elements
•
2- and 3-wire operation
•
Individually configurable function
modules
•
RoHS compilant
GENERAL DESCRIPTION
AM462 is a universal V/I converter and
amplifier IC with a number of additional
functions. The IC basically consists of an
amplifier, whose gain can be set externally,
and an output stage which can convert voltage
signals referenced to ground to industrial
current signals. An additional reference
voltage source for the supply of external
components is also included in the device. A
further operational amplifier can be connected
up as a current source, voltage reference or
comparator.
One of the main features of the IC is its
integrated protective circuitry. The device is
protected against reverse polarity and has a
built-in output current limit. Converter IC
AM462 enables industrial current loop signals
(e.g. of 0/4–20mA) to be produced relatively
easily.
Using the Frame ASIC concept [1] the IC can
be connected up to a processor for signal
correction.
BLOCK DIAGRAM
CVREF
CVSET
2
AM462
OP2
V
BG
1
VSET VREF
SET
16
15
13
I
Voltage Reference
11
10
9
RS+
VCC
RS-
IOUT
INP
3
V
OP1
4
INN
5
OUTAD
6
INDAI
14
8
GND
Figure 1:
Block diagram of AM462 (individually configurable function modules)
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: http://www.analogmicro.de
Phone:
Fax:
Email:
+49 (0)6131/91 073 - 0
+49 (0)6131/91 073 – 30
info@analogmicro.de
December2006
3/20
Rev. 2.4
Industrial V/I Converter and Protector IC
AM462
ELECTRICAL SPECIFICATIONS
T
amb
= 25°C,
V
CC
= 24V,
V
REF
= 5V,
I
REF
= 1mA (unless otherwise stated); currents flowing into the IC are negative.
Parameter
Supply Voltage Range
Quiescent Current
Temperature Specifications
Operating
Storage
Junction
Thermal Resistance
T
amb
T
st
T
J
Θ
ja
Θ
ja
Voltage Reference
Voltage
Trim Range
Current
V
REF
vs. Temperature
Line Regulation
Load Regulation
Load Capacitance
Current/Voltage Source OP2
Internal Reference
V
BG
vs. Temperature
Current Source:
I
CV
=
V
BG
/R
SET
, from Figure
Adjustable Current Range
Output Voltage
V
BG
dV
BG
/dT
T
amb
= – 40...+85°C
1.20
1.27
±60
1.35
±140
V
ppm/°C
V
REF
V
REF10
V
REFADJ
I
REF
*
dV
REF
/dT
dV
REF
/dV
dV
REF
/dV
dV
REF
/dI
dV
REF
/dI
C
L
I
REF
≈
5mA
1.9
T
amb
= - 40...+85°C
V
CC
= 6V...35V
V
CC
= 6V...35V,
I
REF
≈
5mA
VSET
not connected
VSET
=
GND, V
CC
≥
11V
4.75
9.5
4.5
0
±90
30
60
0.05
0.06
2.2
5.00
10.0
5.25
10.5
V
REF10
10.0
±140
80
150
0.10
0.15
5.0
V
V
V
mA
ppm/°C
ppm/V
ppm/V
%/mA
%/mA
µF
DIL16 plastic package
SO16 narrow plastic package
70
140
-40
-55
85
125
150
°C
°C
°C
°C/W
°C/W
Symbol
V
CC
I
CC
T
amb
= - 40...+85°C,
I
REF
= 0mA
Conditions
Min.
6
Typ.
Max.
35
1.5
Unit
V
mA
5
I
CV
*
V
CV
V
CV
V
CC
< 19V
V
CC
≥
19V
0
V
BG
V
BG
10
V
CC
– 4
15
mA
V
V
Voltage Source:
V
CV
=
V
BG
(1 +
R
7
/
R
6
), from Figure
Adjustable Voltage Range
Output Current
Load Capacitance
Operational Amplifier Gain Stage (OP1)
Adjustable Gain
Input Range
Power Supply Rejection Ratio
Offset Voltage
G
GAIN
IR
IR
PSRR
V
OS
V
CV
V
CV
I
CV
*
I
CV
C
L
6
V
CC
< 19V
V
CC
≥
19V
Source
Sink
Source mode
0
1
V
CC
< 10V
V
CC
≥
10V
0
0
80
90
±0.5
±2
V
CC
– 5
5
V
V
dB
mV
1
0.4
0.4
V
CC
– 4
15
10
–100
10
V
V
mA
µA
nF
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: http://www.analogmicro.de
Phone:
Fax:
Email:
+49 (0)6131/91 073 - 0
+49 (0)6131/91 073 – 30
info@analogmicro.de
December2006
4/20
Rev. 2.4
Industrial V/I Converter and Protector IC
AM462
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Operational Amplifier Gain Stage (OP1) (cont.)
V
OS
vs. Temperature
Input Bias Current
I
B
vs. Temperature
Output Voltage Limitation
Output Voltage Range
Load Capacitance
V/I Converter
Internal Gain
Trim Range
Voltage Range at
R
0
FS
Offset Voltage
V
OS
vs. Temperature
Input Resistance
R
IN
vs. Temperature
Output Offset Current
I
OUTOS
vs. Temperature
Output Offset Current
I
OUTOS
vs. Temperature
Output Control Current
I
OUTC
vs. Temperature
Output Voltage Range
Output Current Range FS
Output Resistance
Load Capacitance
SET Stage
Internal Gain
Input Voltage
Offset Voltage
V
OS
vs. Temperature
Input Bias Current
I
B
vs. Temperature
Protection Functions
Voltage Limitation at
R
0
Protection against reverse polarity
Current in the event of reverse polarity
System Parameters
Nonlinearity
Ideal input
0.05
0.15
%FS
V
LIMR0
V
INDAI
= 0,
V
R0
=
G
SET
V
SET
Ground
vs.
V
S
vs.
V
OUT
Ground
vs.
V
S
vs.
I
OUT
Ground
= 35V,
V
S
=
I
OUT
= 0
4.5
580
635
690
35
35
mV
V
V
mA
G
SET
V
SET
V
OS
dV
OS
/dT
I
B
dI
B
/dT
0
±0.5
±1.6
8
7
0.5
1.15
±1.5
±5
20
18
V
mV
µV/°C
nA
pA/°C
V
R0
FS
V
OS
dV
OS
/dT
R
IN
dR
IN
/dT
I
OUTOS
dI
OUTOS
/dT
I
OUTOS
dI
OUTOS
/dT
I
OUTC
dI
OUTC
/dT
V
OUT
V
OUT
I
OUTFS
R
OUT
C
L
3-wire operation
3-wire operation
2-wire operation
2-wire operation
2-wire operation,
V
R0
/100mV
2-wire operation
V
OUT
=
R
L
I
OUT
,
V
CC
< 18V
V
OUT
=
R
L
I
OUT
,
V
CC
≥
18V
I
OUT
=
V
R0
/R
0
, 3-wire operation
0.5
0
0
0
20
1.0
500
F
F
dV
OS
/dT
I
B
dI
B
/dT
V
LIM
V
OUTAD
V
OUTAD
C
L
G
VI
Adjustable by
R
0
≥
100
≥
100
120
0.2
0,12
0.75
350
V
CC
< 10V
V
CC
≥
10V
0
0
±3
10
7
V
REF
±7
25
20
V
CC
– 5
V
REF
250
µV/°C
nA
pA/°C
V
V
V
pF
0.125
1.00
±2
±7
160
0.3
–25
16
9.5
6
6
–10
0,13
1.25
750
±4
±14
mV
mV
µV/°C
kΩ
kΩ/°C
–35
26
14
8
8
–15
V
CC
– 6
12
µA
nA/°C
µA
nA/°C
µA
nA/°C
V
V
mA
MΩ
nF
* In 2-wire operation a maximum current of
I
OUTmin
–
I
CC
is valid
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: http://www.analogmicro.de
Phone:
Fax:
Email:
+49 (0)6131/91 073 - 0
+49 (0)6131/91 073 – 30
info@analogmicro.de
December2006
5/20
Rev. 2.4
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