1 Features
1• High Resolution:
– SNR: 130 dB (250 SPS, PGA = 1)
• High Accuracy:
– THD: –122 dB
• Low Power Consumption:
– 18 mW (PGA = 1, 2, 4, or 8)
– Shutdown Mode: 10 μW
• Low-Noise PGA: 5 nV/√Hz
• Two-Channel Input Multiplexer
• Inherently-Stable Modulator With Fast Responding
Overrange Detector
• 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
• Offset and Gain Calibration Engine
• SYNC Input
• Analog Supply: 5 V or ±2.5 V
• Digital Supply: 1.8 V to 3.3 V

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

3 Description
The ADS1283 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
ADS1283 is suitable for the demanding needs of
seismic monitoring equipment.
The converter uses a fourth-order, inherently stable,
delta-sigma (ΔΣ) modulator that provides outstanding
noise and linearity performance. The modulator digital
output is digitally filtered and decimated by the onchip
digital filter to yield the ADC conversion result.
The flexible input mux provides an additional external
input for measurement, as well as internal self-test
input connections. The PGA features outstanding low
noise (5 nV/√Hz) and very-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 highpass
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 ADS1283
devices.
The ADS1283 is available in a compact 24-lead, 5-
mm × 4-mm VQFN package, and is fully specified
from –40°C to +85°C, with a maximum operating
temperature range of –50°C to +125°C.