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参数资料
型号： XE8000EV104
厂商： Semtech
文件页数： 37/156页
文件大小： 0K
描述： EVAL BOARD FOR XE8805AMI028LF
标准包装： 1
类型： MCU
适用于相关产品： XE88LC05AMI028
所含物品： 完全组装的评估板
Semtech 2006
www.semtech.com
18-10
XE8805/05A
XE88xx
DAS_OUT
DAS_AI_M
DAS_AO
DAS_AI_P
amp
analog ground
R
C
nR
mC
kR
D
A
c
o
n
t
r
o
l
Figure 18-3. Second order low pass filter.
18.7
4-20mA loop
18.7.1
2-wire loop with first order filtering
The amplifier can be used to build a 4-20mA loop externally. Figure 18-4 shows the principle of such a 2-wire loop
using a first order low pass filter.
In a 2-wire loop, the current consumption of the sensor and read-out electronics is drawn on the same wires as the
signal current. The current consumption of the sensor and read-out electronics should therefore remain below
4mA. The signal current is then added by the bipolar transistor. The resistors Rlim1 and Rlim2 are added to protect
the bipolar transistor against high transient currents during power-up. Rlim1 is generally set to a few k. The value
of Rlim2 is chosen as a function of the external loop voltage VEXT and the transistor saturation voltage VCEsat.
mA
R
V
R
sense
CEsat
EXT
20
)
20
(
2
lim
=
If VEXT is larger than 5.5V, a voltage regulator has to be inserted. Since the quiescent current of the regulator adds
up to the 4mA budget, a component with sufficiently low quiescent current has to be selected.
The resistor Rsense measures the total current in the loop (if Rsense<<Rf2). The resistors Rf1 and Rf2 are used to set
the gain and Rf2 and Cf to set the bandwidth of the filter. The resistor Roffset adds an offset to the filter voltage so
that the code 0 of the D/A corresponds to 4mA. The amplifier will force a current through the bipolar transistor so
that the voltage on the filter Vf and VSS on Rsense is equal. This transforms the filter voltage into a loop current
Iloop=(VSS-VEXT-)/Rsense.
Not
Recommended
for
New
Designs
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