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AM417 Fiches technique(PDF) 4 Page - Analog Microelectronics

No de pièce AM417
Description  RATIOMETRIC VOLTAGE TRANSMITTER
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Fabricant  AME [Analog Microelectronics]
Site Internet  http://www.ame.com.tw/
Logo AME - Analog Microelectronics

AM417 Fiches technique(HTML) 4 Page - Analog Microelectronics

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RATIOMETRIC VOLTAGE TRANSMITTER
AM417
analog microelectronics
April 99
4/6
FUNCTIONAL DESCRIPTION
The AM417 is an integrated low cost ratiometric voltage transmitter specially designed for bridge
input signals in automotive applications. With its integrated, ratiometrical current source the
AM417 is ideally suited for the signal conditioning of piezoresistive pressure transducers and allows
an easy temperature compensation and span adjustment of a these kinds of sensors.
The AM417 consists of 3 basic functional blocks:
1. A Ratiometrical Current Source for transducer excitation:
The current IIB can be adjusted by the variation of the resistor R1 by the following relation:
I
V
R
IB
VCC
=
10
1
2. An Instrumentation Amplifier Input Stage with a fixed gain GIA = 10 for pre–amplifiing the
bridge input signal.
3. An Open Collector Output Stage with the following functions:
• Voltage Output: As output is used a voltage amplifier which has an external PNP–open col-
lector stage T1 which is able to push a maximum current of IOUT = 5mA. The gain GOUT is ad-
justable by the external resistors R3 and R4 between GOUT = 2...11:
G
R
RR
OUT =
+
3
34
The gain G of the complete system becomes then G = GIA GOUT.
• Current Limitation: A simple clamp stage for the output pin VOUT limits the voltage drop
against VCC to
()
VV
V
T
OUT
VCC
BE
max
.
=−15
1 .
The maximum current can be set by adding a resistor in series to the Emitter of the transistor T1
at the output stage (see figure 4). For the maximum output current is valid:
()
I
VV
T
RR
OUT
TRESH
BE
max =
1
22
370mV
.
If no current limitation is required, the Emitter of the transistor T1 has to be directly connected to
VCC (R2 = 0
Ω). A proper thermic coupling of the Transistor T1 (VBE–Drift: –2mV/°C typ.)
and the AM417 reduces the resulting temperature drift of IOUT and increases the performance
of the current limitation.
Adjustment of Output Voltage Range
The span of the output voltage could be adjusted by the gain GOUT of the output stage. The offset of
the output voltage can be adjusted in the same way as the adjustment of the sensor offset using the
resistors RO1 and RO2 (figure 4).


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