am452 AME, Inc., am452 Datasheet - Page 7

• Manufacturer Part Number: am452
• Description: Voltage-to-current Transducer Ic With A Differential Input - Analog Microelectronics
• Manufacturer: AME, Inc.

Figure 2: Block diagram of AM452 (3-wire version).
Parameter
Sense Resistor
Stabilization Resistor
Load Resistance
Sum Gain Resistors
Sum Offset Resistors
Sum IA Offset Resistor
V
Output Capacitance
D
T
BOUNDARY CONDITIONS
Table 2: Boundary conditions
NB: In 2-wire operation and with the connected resistors capacitance C
filter with a time constant of 2 = R
V
V
V
1
REF
1
V
C VSET
IN+
IN-
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Forward Current Gain
Breakdown Voltage
R EF
Capacitance
AM452 – Voltage-to-current transducer IC
2
4
3
V
R
AM452
BG
6
ZERO Stage
V
OP2
ZA
IA
V
13
C VREF
R
7
1
Voltage Reference
V
SET
12
5
C
R
V
with a differential input
OP1
2
REF
1
15
Symbol
R
R
R
R
6
1
1
3
V
C
C
R
R
R
R
R
R
+ R
+ R
+ R
BR
L
F
0
1
2
3
16
2
4
7
V
7
OP
L
R
G
G
G
4
G
C
SET
S ET
VI
V I
I
c = 20mA/I
I
c = 20mA/I
Only for 3-wire operation
Min. value for T
Only for 2-wire operation
e.g. BCX54/55/56
OUTFS
OUTFS
2
V/I Converter
SET Stage
.
= 20mA
= 20mA
OUTFS
OUTFS
Conditions
14
amb
GND
85°C
11
10
9
8
T
Ground
1
D
R
R
1
0
5
V
I
OUT
S
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February 2008 - Rev 1.2 - Page 7/21
c 16
c 35
Min.
1.9
16
35
20
20
20
90
35
50
0
Figure 2 shows AM452 as
a 3-wire application where
output current I
0mA is set using the
instrumentation amplifier
(with a negative offset at
the IA input) and the SET
stage. The gain on the
maximum output current
is adjusted using OP1.
+49 (0)6131/91 073-30
http://www.analogmicro.de
2
c 27
c 40
acts as a low pass
Typ.
100
150
2.2
27
40
50
Max.
c 38
c 45
600
200
200
200
250
5.0
OUT min
38
45
>
Unit
k
k
k
nF
V
F