VOLTAGE/CURRENT CONVERTER
Parameter
V/I Converter
Internal Gain
Trim Range
Voltage Range at
R
0
FS
Offset Voltage
V
OS
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
V
R0
FS
V
OS
dV
OS
/dT
I
OUTOS
dI
OUTOS
/dT
I
OUTOS
dI
OUTOS
/dT
I
OUTC
dI
OUTC
/dT
V
OUT
V
OUT
Output Current Range FS
Output Resistance
Load Capacitance
Protection Functions
Voltage Limitation at
R
0
Temperature Limitation
Protection against reverse polarity
Current in case of reverse polarity
System Parameters
Nonlinearity
ideal input
0.05
V
LIMR0
V
LIMR0
T
LIMIT
Ground
vs.
V
S
vs.
I
OUT
Ground
= 35V,
V
S
=
I
OUT
= 0
3.8
V
R0
=
V
IN
/2,
SET
=
V
REF
/2
V
IN
= 0,
V
R0
=
V
SET
/2 –
V
REF
/2
580
580
110
635
640
130
I
OUTFS
R
OUT
C
L
G
VI
adjustable by
R
0
0.75
400
1.00
1.00
500
±2
±7
–35
55
14
22
5
–9
0
0
20
0.5
0
1.0
Symbol
Conditions
Min.
Typ.
AM422
Max.
Unit
1.25
580
±6
±20
–50
80
22
35
mV
mV
µV/°C
µA
nA/°C
µA
nA/°C
µA
nA/°C
V
CC
– 6
10
V
V
mA
MΩ
500
nF
β
F
≥
100
β
F
≥
100
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
< 16V
V
OUT
=
R
L
I
OUT
,
V
CC
≥
16V
I
OUT
=
V
R0
/R
0
, 3–wire operation
690
700
150
35
mV
mV
°C
V
mA
0.15
%FS
* In 2–wire operation a maximum current of
I
OUTmin
–
I
CC
is valid
Currents flowing into the IC are negative
BOUNDARY CONDITIONS
Parameter
Sense Resistor
Symbol
R
0
R
0
Stabilisation Resistor
R
5
R
5
Load Resistance
Sum Offset Resistors
V
REF
Capacitance
Output Capacitance
D
1
Breakdown Voltage
T
1
Forward Current Gain
R
L
R
3
+
R
4
C
1
C
2
V
BR
only for 2–wire operation
Conditions
I
OUTFS
= 20mA
c
= 20mA/I
OUTFS
I
OUTFS
= 20mA
c
= 20mA/I
OUTFS
limitation only for 3–wire operation
Min.
20
c
⋅
20
35
c
⋅
35
0
20
1.9
90
35
50
2.2
100
50
150
Typ.
25
c
⋅
25
40
c
⋅
40
Max.
29
c
⋅
29
45
c
⋅
45
500
200
5.0
250
Unit
Ω
Ω
Ω
Ω
Ω
kΩ
µF
nF
V
β
F
analog microelectronics
April 99
3/10
AME [ ANALOG MICROELECTRONICS ]
