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ADS1131ID bảng dữ liệu(PDF) 6 Page - Texas Instruments

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ADS1131ID bảng dữ liệu(HTML) 6 Page - Texas Instruments

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R
INT
R
INT
R
F1
R
1
R
F2
ADC
A3
Gain=1
CAP
AINP
CAP
A2
A1
450W
18pF
AINN
450W
18pF
ADS1131
SBAS449B
– JULY 2009 – REVISED SEPTEMBER 2011
www.ti.com
OVERVIEW
ranges from 0mV to +39mV. The inputs of the
The ADS1131 is a precision, 18-bit ADC that includes
ADS1131
are
protected
with
internal
diodes
a
low-noise
PGA,
internal
oscillator,
third-order
connected to the power-supply rails. These diodes
delta-sigma (
ΔΣ) modulator, and fourth-order digital
clamp the applied signal to prevent it from damaging
filter. The ADS1131 provides a complete front-end
the input circuitry.
solution for bridge sensor applications such as weigh
scales, strain gauges, and pressure sensors.
Data can be output at 10SPS for excellent 50Hz and
60Hz rejection, or at 80SPS when higher speeds are
needed. The ADS1131 is easy to configure, and all
digital control is accomplished through dedicated
pins; there are no registers to program. A simple
two-wire serial interface retrieves the data.
ANALOG INPUTS (AINP, AINN)
The input signal to be measured is applied to the
input pins AINP and AINN. The ADS1131 accepts
differential input signals, but can also measure
unipolar
signals.
When
measuring
unipolar
(or
single-ended signals) with respect to ground, connect
the negative input (AINN) to ground and connect the
input signal to the positive input (AINP). Note that
when the ADS1131 is configured this way, only half
of the converter full-scale range is used, because
Figure 1. Simplified Diagram of the Amplifier
only positive digital output codes are produced.
External Capacitor
LOW-NOISE AMPLIFIER
An external capacitor (CEXT) across the ADS1131 two
The ADS1131 features a low-drift, low-noise amplifier
CAP pins combines with the internal resistor RINT
that provides a complete front-end solution for bridge
(on-chip)
to
create
a
low-pass
filter.
The
sensors. A simplified diagram of the amplifier is
recommended value for CEXT is 0.1μF which provides
shown
in
Figure
1.
It
consists
of
two
a corner frequency of 720Hz. This low-pass filter
chopper-stabilized amplifiers (A1 and A2) and three
serves two purposes. First, the input signal is
accurately matched resistors (R1, RF1, and RF2) that
bandlimited to prevent aliasing by the ADC and to
construct a differential front-end stage with a gain of
filter
out
the
high-frequency
noise.
Second,
it
64, followed by gain stage A3 (Gain = 1). The inputs
attenuates the chopping residue from the amplifier to
are equipped with an EMI filter, as shown in Figure 1.
improve temperature drift performance. NPO or C0G
The cutoff frequency of the EMI filter is 20MHz. By
capacitors
are
recommended.
For
optimal
using AVDD as the reference input, the bipolar input
performance, place the external capacitor very close
ranges from
–39mV to +39mV, and the unipolar input
to the CAP pins.
6
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Copyright
© 2009–2011, Texas Instruments Incorporated


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