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CS3302 Datasheet(PDF) 10 Page - Cirrus Logic |
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CS3302 Datasheet(HTML) 10 Page - Cirrus Logic |
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10 / 16 page  CS3302 10 DS596F3 2. GENERAL DESCRIPTION The CS3302 is a high-impedance, low-noise CMOS differential input, differential output ampli- fier for precision analog signals between DC and 2 kHz. It has multiplexed inputs, rough/fine charge outputs, 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 CS5371/72 single/dual ∆Σ modulators and the CS5376A quad digital fil- ter. Figure 3 shows the system-level architecture of a 4-channel acquisition system using four CS3302, two CS5372, one CS4373A, and one CS5376A. 2.1 Analog Signals 2.1.1 Analog Inputs The amplifier analog inputs are designed for high- impedance differential sensors. Input multiplexing simplifies system connections by providing sepa- rate inputs for a sensor and test DAC (INA, INB) as well as an internal termination for noise tests. The MUX0, MUX1 digital pins determine which multi- plexed 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 CS5371/72 inputs. Each output also includes a series resistor, requiring only two differential ca- pacitors to create the CS5371/72 input anti-alias filter. ∆Σ M odulator ∆Σ M odulator Digital Filter AM P AM P AM P AM P 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 Comm unication Interface CS3301 CS3302 CS5371 CS5371 CS5376A CS4373A System Telemetry CS3301 CS3302 CS3301 CS3302 CS3301 CS3302 CS5372 CS5372 Switch MUX Switch MUX Figure 3. System Architecture |
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