4th-Order
DS
Modulator
Programmable
Digital Filter
SPI
Interface
Calibration
Control
CLK
AVDD
AVSS
DVDD
DGND
Over-Range
Modulator Output
ADS1282
DOUT
DIN
DRDY
SCLK
SYNC
RESET
PWDN
3
PGA
MUX
Input 1
Input 2
VREFN
VREFP
V
COM
SBAS418I – SEPTEMBER 2007 – REVISED MARCH 2015
ADS1282 High-Resolution Analog-To-Digital Converter
1 Features
3 Description
The ADS1282 is an extremely high-performance,
1
•
High Resolution:
single-chip analog-to-digital converter (ADC) with an
130-dB SNR (250 SPS)
integrated, low-noise programmable gain amplifier
•
High Accuracy:
(PGA) and two-channel input multiplexer (mux). The
THD: –122 dB
ADS1282 is suitable for the demanding needs of
INL: 0.5 ppm
energy
exploration
and
seismic
monitoring
environments.
•
Low-Noise PGA
•
Two-Channel Input Mux
The converter uses a fourth-order, inherently stable,
delta-sigma (
ΔΣ
) modulator that provides outstanding
•
Inherently-Stable Modulator with Fast Responding
noise and linearity performance. The modulator is
Overrange Detection
used either in conjunction with the on-chip digital
•
Flexible Digital Filter:
filter,
or
can
be
bypassed
for
use
with
post
Sinc + FIR + IIR (Selectable)
processing filters.
Linear or Minimum Phase Response
The
flexible
input
MUX
provides
an
additional
Programmable High-Pass Filter
external input for measurement, as well as internal
Selectable FIR Data Rates: 250 SPS to 4 kSPS
self-test connections. The PGA features outstanding
•
Filter Bypass Option
low noise (5 nV/
√
Hz) and high input impedance,
•
Low Power Consumption: 25 mW
allowing
easy
interfacing
to
geophones
and
hydrophones over a wide range of gains.
Shutdown: 10
μ
W
•
Offset and Gain Calibration Engine
The digital filter provides selectable data rates from
250 to 4000 samples per second (SPS). The high-
•
SYNC Input
pass filter (HPF) features an adjustable corner
•
Analog Supply:
frequency. On-chip gain and offset scaling registers
Unipolar (+5 V) or Bipolar (±2.5 V)
support system calibration.
•
Digital Supply: 1.8 V to 3.3 V
The synchronization input (SYNC) can be used to
synchronize the conversions of multiple ADS1282s.
2 Applications
The SYNC input also accepts a clock input for
•
Energy Exploration
continuous alignment of conversions from an external
source.
•
Seismic Monitoring
•
High-Accuracy Instrumentation
Together, the amplifier, modulator, and filter dissipate
25 mW. The ADS1282 is available in a compact
TSSOP-28 package and is fully specified from –40°C
to +85°C, with a maximum operating range to
+125°C.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
