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AM417 Folha de dados(PDF) 6 Page - Analog Devices

Nome de Peças AM417
Descrição Electrónicos  Ratiometric instrumentation amplifier with adjustable output stage
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Página de início  http://www.analog.com
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AM417 – Ratiometric instrumentation
amplifier with adjustable output stage
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
July 2008 –Rev 3.1- Page 6/18
Phone:+49 (0)6131/91 073-0
Fax: +49 (0)6131/91 073-30
Internet: http://www.analogmicro.de
Email: info@analogmicro.de
DESCRIPTION OF FUNCTIONS
AM417 is a ratiometric, adjustable interface IC which has been specially developed for the
conditioning of bridge signals for automotive applications. With its integrated, ratiometric current
source it is particularly suitable for the excitation of piezoresistive bridge devices in a constant
current mode. The IC enables simple calibration and temperature compensation of the input signals.
AM417 consist of three functional units:
Instrumentation amplifier
Using the input stage of the instrumentation amplifier (IA) the input signal is preamplified by
GIA = 10. The IA can only process positive input signals. A negative input voltage or negative
input offset must be balanced by using additional resistor at positive input pin VIN+ (c.f. Setting
the output offset).
Current source
The additional operational amplifier (OP) is linked internally to supply voltage VCC via a voltage
divider (10:1). With the OP acting as a ratiometric current source a resistor measuring cell can be
supplied with constant current within a range of 0.5 – 1.25mA.
The supply current of the external sensing element IIB can be set by varying resistor R1 at the
minus input of the OP (VIN-) using the following ratio:
1
10 R
V
I
VCC
IB =
(1)
Output stage
A voltage amplifier with an external PNP open collector stage (T1) acts as a voltage output and
can provide a maximum current of IOUT = 11mA. Using external resistors R3 and R4 the Gain
GOUT can be adjusted between 2.and 11.
4
4
3
R
R
R
G
OUT
+
=
(2)
The gain of the entire circuit AM417 is thus: GSYS = GIA GOUT.
A current limitation has been integrated into the output stage. The limit circuit restricts output
voltage VOUTmin with reference to VCC, where VBE is the basic emitter voltage of external
transistor T1.
( )
1
min
5
.
1
T
V
V
V
BE
VCC
VOUT
=
(3)
With this the maximum output current can be adjusted using resistor R2 in series with the T1
transistor emitter (see Figure 2). The current is thus calculated as:
()
2
2
1
max
mV
380
R
R
T
V
V
I
BE
THRESH
OUT
=
(4)


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