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.