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TS1004IT14 bảng dữ liệu(PDF) 8 Page - Silicon Laboratories

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Giải thích chi tiết về linh kiện  THE ONLY 0.8V/0.6A RAIL-TO-RAIL DUAL/QUAD OP AMPS
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TS1002/TS1004
Page 8
TS1002/4 Rev. 1.0
is 20.9% and air samples containing less than 18%
oxygen are considered dangerous. In industrial
applications, oxygen sensors are used to detect the
absence of oxygen; for example, vacuum-packaging
of food products is one example.
The
circuit
in
Figure
1
illustrates
a
typical
implementation used to amplify the output of an
oxygen detector. Either amplifier makes an
excellent choice for this application as it only draws
0.6µA of supply current per amplifier and operates
on supply voltages down to 0.65V. With the
components
shown
in
the
figure,
the
circuit
consumes less than 0.7
μA of supply current
ensuring that small form-factor single- or button-cell
batteries (exhibiting low mAh charge ratings) could
last beyond the operating life of the oxygen sensor.
The precision specifications of these amplifiers, such
as their low offset voltage, low TCVOS, low input bias
current, high CMRR, and high PSRR are other
factors
which
make
these
amplifiers
excellent
choices for this application. Since oxygen sensors
typically exhibit an operating life of one to two years,
an oxygen sensor amplifier built around one of these
amplifiers
can
operate
from
a
conventionally-
available single 1.5-V alkaline AA battery for over
290 years! At such low power consumption from a
single cell, the oxygen sensor could be replaced
over 150 times before the battery requires replacing!
NanoWatt, Buffered Single-pole Low-Pass Filters
When
receiving
low-level
signals,
limiting
the
bandwidth of the incoming signals into the system is
often required. As shown in Figure 2, the simplest
way to achieve this objective is to use an RC filter at
the noninverting terminal of the amplifier.
If additional attenuation is needed, a two-pole
Sallen-Key filter can be used to provide the
additional attenuation as shown in Figure 3.
For best results, the filter’s cutoff frequency should
be 8 to 10 times lower than the amplfier’s crossover
frequency. Additional operational amplifier phase
margin
shift
can
be
avoided
if
the
amplifier
bandwidth-to-signal bandwidth ratio is greater than
8.
The design equations for the 2-pole Sallen-Key low-
pass filter are given below with component values
selected to set a 400Hz low-pass filter cutoff
frequency:
R1 = R2 = R = 1M
C1 = C2 = C = 400pF
Q = Filter Peaking Factor = 1
f–3dB = 1/(2 x
π x RC) = 400 Hz
R3 = R4/(2-1/Q); with Q = 1, R3 = R4.
A Single +1.5 V Supply, Two Op Amp
Instrumentation Amplifier
The amplifiers’ ultra-low supply current and ultra-low
voltage operation make them ideal for battery-
powered applications such as the instrumentation
amplifier shown in Figure 4 using a TS1002.
Figure 2: A Simple, Single-pole Active Low-Pass Filter.
Figure 3: A Nanopower 2-Pole Sallen-Key Low-Pass Filter.
Figure 1: A Nanopower, Precision Oxygen Gas Sensor
Amplifier.


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