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ADS1282 Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza ADS1282
Descripción Electrónicos  High-Resolution Analog-to-Digital Converter
Download  42 Pages
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

ADS1282 Datasheet(HTML) 11 Page - Texas Instruments

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Frequency(Hz)
0
-20
-40
-60
-80
-100
-180
1
10
100
100k
1k
10k
-120
-140
-160
1HzResolution
V
=20mV
IN
DC
MODULATOR INPUT IMPEDANCE
MODULATOR OVER-RANGE
MODULATOR OVER-RANGE DETECTION
ADS1282
SBAS418A – SEPTEMBER 2007 – REVISED DECEMBER 2007
The modulator is optimized for input signals within a
If the inputs are sufficiently overdriven to drive the
4kHz passband. As Figure 7 shows, the noise
modulator to full duty cycle (that is, all 1s, all 0s,
shaping of the modulator results in a sharp increase
or±110%FSR),
the
modulator
enters
a
stable
in noise above 6kHz. The modulator has a chopped
saturated state. The digital output code may clip to
input structure that further reduces noise within the
+FS or –FS, again depending on the duration. A
passband. The noise is moved out of the passband
small duration overdrive may not always clip the
and appears at the chopping frequency (fCLK/512 =
output code. When the input returns to the normal
8kHz). The component at 6.5kHz is the tone
range, the modulator requires up to 12 modulator
frequency, shifted out of band by a 20mV external
clock cycles (fMOD) to exit saturation and return to the
input. The frequency of the tone is approximately
linear region. The digital filter requires an additional
VIN/3 (in kHz).
62 conversions for fully settled data (linear phase
FIR).
In the extreme case of over-range, either input is
overdriven
exceeding
that
either
analog
supply
voltage plus an internal ESD diode drop. The internal
ESD diodes begin to conduct and the signal on the
input is clipped. If the differential input signal range is
not exceeded, the modulator remains in linear
operation. If the differential input signal range is
exceeded, the modulator is saturated but stable, and
outputs all 1s or 0s. When the input overdrive is
removed, the diodes recovery quickly
and
the
ADS1282 recovers as normal. Note that the linear
input range is ±100mV beyond the analog supply
voltages; with input levels above this, use care to limit
the input current to 100mA peak transient and 10mA
continuous.
Figure 7. Modulator Output Spectrum
The modulator samples the buffered input voltage
with an internal capacitor to perform conversions. The
The ADS1282 modulator is inherently stable, and
charging of the input sampling capacitor draws a
therefore, has predictable recovery behavior that
transient current from the PGA output. The average
results
from
an
input
overdrive
condition.
The
value of the current can be used to calculate an
modulator does not exhibit self-resetting behavior,
effective input impedance of REFF = 1/(fMOD × CS).
which often results in an unstable output data stream.
Where:
The ADS1282 modulator outputs a 1s density data
fMOD = Modulator sample frequency (CLK/4)
stream at 90% duty cycle with the positive full-scale
CS = Input sampling capacitor (22pF, typ)
input signal applied (10% duty cycle with the negative
full-scale signal). If the input is overdriven past 90%
The resulting modulator input impedance for CLK =
modulation, but below 100% modulation (10% and
4.096MHz is 55k
Ω. Note that the modulator input
0%
for
negative
overdrive,
respectively),
the
impedance and the PGA output anti-alias resistors
modulator remains stable and continues to output the
result in a systematic gain error of –1%. CS can vary
1s density data stream. The digital filter may or may
±20% or more over production lots, affecting the gain
not clip the output codes to +FS or –FS, depending
error.
on the duration of the overdrive. When the input
returns to the normal range from a long duration
overdrive
(worst
case),
the
modulator
returns
(MFLAG)
immediately to the normal range, but the group delay
The ADS1282 has a fast-responding over-range
of the digital filter delays the return of the conversion
detection,
indicating
when
the
differential
input
result to within the linear range (31 readings for linear
exceeds
approximately
100%
over-range.
The
phase FIR). 31 additional readings (62 total) are
threshold tolerance is ±2.5%.The MFLAG output
required for completely settled data.
asserts high when in an over-range condition. As
Copyright © 2007, Texas Instruments Incorporated
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