Geophone Low Noise, Programmable Gain Differential Amplifier

Delivering low noise, high performance, and a small footprint, the CS3301A seismic amplifiers is designed for use with geophone sensors. This highly integrated, programmable gain differential amplifier is engineered for precise low frequency, high dynamic range measurements. Based on Cirrus Logic’s patented Multipath amplifier architecture, this powerful amplifier provides unrivaled noise and drift performance. Low-power consumption combined with outstanding THD performance makes them ideal for today’s seismic applications. Chopper stabilized and designed for use with geophone sensors, the CS3301A delivers impressive low noise, low drift performance down to 0.1 Hz. With an extensive feature set and available in a 24-pin SSOP package, this amplifier provides an outstanding price/performance combination for seismic applications.


  • Signal bandwidth: DC to 2 kHz
  • Differential inputs, differential outputs
    • Multiplexed inputs: INA, INB, 800 Ω termination
  • Max signal amplitude: 5 Vp-p differential
  • High performance
    • Outstanding noise performance
      • 0.18 µVp-p between 0.1 Hz and 10 Hz
      • 8.5 nV/Hz from 0.1 Hz to 2 kHz
    • Low total harmonic distortion
      • -121 dB THD typical (0.000089%)
      • -112 dB THD maximum (0.000251%)
    • Low input bias: 1 nA
    • Low drift: 0.05 µV/°C max
  • Low-power consumption
    • Normal/PWDN: 5.5 mA, 10 µA
  • High integration
    • Pin-selectable gain: x1, x2, x4, x8, x16, x32, x64
  • Dual power supply configuration
    • VA+ = +2.5 V; VA- = -2.5 V; VD = +3.3 V
  • Available in a 24-pin SSOP package

Parametric Specifications

THD (dB) -121
Power Consumption Per Channel (mW) 27.5
Signal Range (Vp-p diff) 5
Package 24 SSOP

Technical Documents

Errata: CS3301 Rev. C

Dec 4, 2007, ER595A3 : 39 Kb

CS3301A/02A Product Bulletin

Sep 25, 2007, 0076-0807-PB-W : 572 Kb

CS3301A Product Data Sheet

Sep 25, 2007, DS757F1 : 338 Kb


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