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CS3301A датащи(PDF) 9 Page - Cirrus Logic |
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CS3301A датащи(HTML) 9 Page - Cirrus Logic |
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9 / 16 page ![]() CS3301A DS757F1 9 2. GENERAL DESCRIPTION The CS3301A is a low-noise chopper-stabilized CMOS differential input, differential output ampli- fier for precision analog signals between DC and 2 kHz. It has multiplexed inputs, rough / fine out- puts and programmable gains of x1, x2, x4, x8, x16, x32, and x64. The amplifier’s performance makes it ideal for low-frequency, high dynamic range applications requiring low distortion and minimal power con- sumption. It’s optimized for use in acquisition sys- tems designed around the CS5371A/72A single/dual ∆Σ modulators and the CS5376A quad digital filter or the CS5373A ∆Σ modulator and CS5378 digital filter. Figure 3 on page 9 shows the system architecture of a 4-channel acquisition system using four CS3301A, two CS5372A, one CS4373A, and one CS5376A. Figure 4 on page 10 shows the system architecture of a single channel acquisition system using a CS3301A, CS5373A, and CS5378. 2.1 Analog Signals 2.1.1 Analog Inputs The amplifier analog inputs are designed for differ- ential sensors. Input multiplexing simplifies sys- tem connections by providing separate inputs for a sensor and test DAC (INA, INB) as well as an in- ternal termination for noise tests. The MUX0, MUX1 digital pins determine which multiplexed input is connected to the amplifier. 2.1.2 Analog Outputs The amplifier analog outputs are separated into rough charge / fine charge signals to easily connect to the CS5371A/72A/73A modulator inputs. Each differential output requires two series resistors and a differential capacitor to create the modulator anti- alias RC filter. ∆Σ Modulator ∆Σ Modulator Digital Filter AMP AMP AMP AMP Geophone or Hydrophone Sensor Geophone or Hydrophone Sensor Geophone or Hydrophone Sensor Geophone or Hydrophone Sensor M U X M U X M U X M U X Test DAC µController or Configuration EEPROM Communication Interface CS3301A CS3302A CS5371A CS5371A CS5376A CS4373A System Telemetry CS3301A CS3302A CS3301A CS3302A CS3301A CS3302A CS5372A CS5372A Switch MUX Switch MUX Figure 3. Multi-Channel System Architecture |
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