ADS1283 - Ultra-High Resolution, 4kSPS, 2-Ch Delta-Sigma ADC With PGA for Seismic and Energy Exploration

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 inputmultiplexer (mux). The ADS1283 is suitable for the demanding needs of seismic monitoringequipment.

The converter uses a fourth-order, inherently stable, delta-sigma (ΔΣ) modulator thatprovides outstanding noise and linearity performance. The modulator digital output is digitallyfiltered and decimated by the on-chip digital filter to yield the ADC conversion result.

The flexible input mux provides an additional external input for measurement, as well asinternal self-test input connections. The PGA features outstanding low noise (5nV/√Hz) and very-high input impedance, allowing easy interfacing togeophones 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 offsetscaling registers support system calibration.

The synchronization input (SYNC) can be used to synchronize the conversions of multipleADS1283 devices.

The ADS1283 is available in a compact 24-lead, 5-mm × 4-mm VQFN package, and is fullyspecified from –40°C to +85°C, with a maximum operating temperature range of –50°C to+125°C.

• 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

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