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CS3302A-IS Scheda tecnica(PDF) 10 Page - Cirrus Logic |
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CS3302A-IS Scheda tecnica(HTML) 10 Page - Cirrus Logic |
10 / 16 page CS3302A CS3302A DS765PP1 10 DS765PP1 2. GENERAL DESCRIPTION The CS3302A 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 performance of this amplifier makes it ideal for low-frequency, high-dynamic-range applica- tions requiring low distortion and minimal power consumption. It is optimized for use in acquisition systems designed around the CS5371A/72A sin- gle/dual ∆Σ modulators and the CS5376A quad digital filter or the CS5373A ∆Σ modulator and CS5378 digital filter. Figure 3 shows the system- level architecture of a 4-channel acquisition system using four CS3302A, two CS5372A, one CS4373A, and one CS5376A. Figure 4 shows the system architecture of a single channel acquisition system using a CS3302A, CS5373A, and CS5378. 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 CS5371A/72A/73A inputs. Each differential output ∆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. System Architecture |
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