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PDF AM402 Data sheet ( Hoja de datos )
| Número de pieza | AM402 | |
| Descripción | CURRENT CONVERTER IC | |
| Fabricantes | Analog Microelectronics | |
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DataSheet.in
CURRENT CONVERTER IC
AM402
FEATURES
• Wide Supply Voltage Range: 6...35V
• Wide Operating Temperature Range:
–40°C...+85°C
• Adjustable Reference Voltage
Source: 4.5 to 10V
• Wide Common Mode Range Instru-
mentation Amplifier
• Adjustable Gain and Offset
• Two–Wire Output: 4...20mA
• Three–Wire Output: 0/4...20mA
• Adjustable Output Current Range
• Protection Against Reverse Polarity
• Current Shutdown with Overvoltage
• Shutdown with Excessive Tempera-
ture
APPLICATIONS
• Industrial Process Control
• Sensor Signal Converter (e.g. pressure)
• Programmable Current Source
BLOCK DIAGRAM
GENERAL DESCRIPTION
AM402 is a monolithically integrated current
converter which has been specially developed
for the processing of differential bridge sig-
nals. AM402 is suitable for two- and three-
wire applications and has four function blocks.
A high-precision instrumentation amplifier
(IA) serves as an input stage. A reference volt-
age source, which can be adjusted to values of
between 4.5 and 10V, excites external compo-
nents and a voltage-controlled current output
stage converts the voltage signal. It is thus
possible to generate output currents which cor-
respond to the normal industrial standards
(0/4–20mA, 12 ± 8mA).
DELIVERY
• DIL16 packages (samples)
• SO16(n) packages
• Dice on 5“ blue foil
GAIN− GAIN GAIN+
10 11 12
AM402
VSET
13
VREF
16
Reference Voltage
9
IN+
8
IN−
Figure 1
Instrumentation
Amplifier
V
14
GND
7
SET
1
RS+
2
VCC
I
3 RS−
5
OUT
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: www.analogmicro.de
Phone: +49 (0)6131/91 073 – 0
Fax: +49 (0)6131/91 073 – 30
E–Mail: info@analogmicro.de
April 99
1/8
Rev. 2.1
1 page  
DataSheet.in
CURRENT CONVERTER IC
AM402
VCC = VS − IOUT ⋅ RL
AM402 is basically made up of three function blocks (see Figure 1):
1. The amplification of the high-precision instrumentation amplifier as the input stage is adjustable and thus
makes applications for a number of input signals and sensors possible. Gain GIA is set via the two exter-
nal resistors R1 and R2. When selecting the resistors, the sum of R1 + R2 given in the Boundary Conditions
must be heeded. When configuring the instrumentation amplifier, the user should ensure that the input
signal has the correct polarity.
2. At the voltage-controlled current output an offset current can be set at the output with the help of the
internal voltage reference across external resistors R3 and R4 (see the Description of Applications, begin-
ning on page 7). Output current IOUT is provided by external transistor T1 which is driven by the output
(IOUT) of the IC. One particular feature of AM402 is that the output current is switched–off if overvolt-
age occurs on the input side of the device. Another safety feature included in AM402 is the integrated
power-down function with excessive temperature. With this, the output current is switched off if the IC
gets too warm.
3. The adjustable reference voltage source supplies sensors or other external components with voltage of 5
or 10V (VSET = N.C. or VSET = GND). Additionally, any voltage value between 4.5 and 10V can be set
via an external voltage divider. Please note, that Capacitor C1 (ceramic) must also be connected even
when the voltage reference is not used.
Initial Operation of AM402
To compensate the offset of the output current for the first time, the input must be short-circuited (VIN = 0).
In doing so, it should be ensured that the input pins of the instrumentation amplifier have the voltage poten-
tials given in the Electrical Specifications (input voltage range). The short circuit at the input produces an
output current IOUT = ISET with
( )I SET
VIN
=0
= VREF
2R0
⋅ R4
R3 + R4
The adjustment of the output current range depends on the choice of external resistors R1 and R2. The maxi-
mum output current is defined by the general transfer function of the IC. The following equation is given for
the output current IOUT:
I OUT
=
VIN
GIA
R0
+ I SET
The gain factor of the instrumentation amplifier GIA = 1 + R1 R2 is determined by the input voltage VIN and
the maximum output current IOUTmax.
The minimum supply voltage is dependent on the value of the reference voltage. The following applies:
VCC ≥ VREF + 1V .
The choice of supply voltage VS also de-
pends on the load resistor RL used by the
application. The following inequation de-
termines the minimum supply voltage:
RL [Ω]
500
RL
≤
VS −VCCmin
IOUTmax
VCCmin = 6V
RLmax = 500Ω
IOUTmax = 20mA
VS ≥ IOUTmax RL + VCCmin .
300
The resulting operating range is given in
Figure 4. Example calculations and typical
values for the external components can be
found in the example application shown in
0
0
the Applications from page 7 onwards.
Figure 4
6
Operating Area
12 16
24
35 VS [V]
analog microelectronics
April 99
5/8
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