1 Features
1• High Resolution:
130-dB SNR (250 SPS)
• High Accuracy:
THD: –122 dB
INL: 0.5 ppm
• Low-Noise PGA
• Two-Channel Input Mux
• Inherently-Stable Modulator with Fast Responding
Overrange Detection
• Flexible Digital Filter:
Sinc + FIR + IIR (Selectable)
Linear or Minimum Phase Response
Programmable High-Pass Filter
Selectable FIR Data Rates: 250 SPS to 4 kSPS
• Filter Bypass Option
• Low Power Consumption: 25 mW
Shutdown: 10 μW
• Offset and Gain Calibration Engine
• SYNC Input high•
Analog Supply:
Unipolar (+5 V) or Bipolar (±2.5 V)
• Digital Supply: 1.8 V to 3.3 V

2 Applications
• Energy Exploration
• Seismic Monitoring
• High-Accuracy Instrumentation

3 Description
The ADS1282 is an extremely high-performance,
single-chip analog-to-digital converter (ADC) with an
integrated, low-noise programmable gain amplifier
(PGA) and two-channel input multiplexer (mux). The
ADS1282 is suitable for the demanding needs of
energy exploration and seismic monitoring
environments.
The converter uses a fourth-order, inherently stable,
delta-sigma (ΔΣ) modulator that provides outstanding
noise and linearity performance. The modulator is
used either in conjunction with the on-chip digital filter, or can be bypassed for use with post
processing filters.
The flexible input MUX provides an additional
external input for measurement, as well as internal
self-test connections. The PGA features outstanding
low noise (5 nV/√Hz) and high input impedance,
allowing easy interfacing to geophones and
hydrophones over a wide range of gains.
The digital filter provides selectable data rates from
250 to 4000 samples per second (SPS). The high•
pass filter (HPF) features an adjustable corner
frequency. On-chip gain and offset scaling registers support system calibration.
The synchronization input (SYNC) can be used to
synchronize the conversions of multiple ADS1282s. The SYNC input also accepts a clock input for
continuous alignment of conversions from an external
source.
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.