The CS5374 combines two marine seismic analog measurement channels into one 7 x 7 mm QFN package. Each measurement channel consists of a high input impedance programmable gain differential amplifier that buffers analog signals into a high-performance, fourth-order Delta-Sigma modulator. The low-noise Delta-Sigma modulator converts the analog signal into a one-bit serial bit stream suitable for the CS5376A digital filter.
Each amplifier has two sets of external inputs, INA and INB, to simplify system design as inputs from a hydrophone sensor or the CS4373A test DAC. An internal 800Ω termination can also be selected for noise tests. Gain settings are binary weighted (1x, 2x, 4x, 8x, 16x, 32x, 64x) and match the CS4373A test DAC output attenuation settings for full-scale testing at all gain ranges. Both the input multiplexer and gain are set by registers accessed through a standard SPI™ port.
Each fourth-order Delta-Sigma modulator has very high dynamic range combined with low total harmonic distortion and low power consumption. It converts differential analog signals from the amplifier to an oversampled Delta-Sigma serial bit stream which is decimated by the CS5376A digital filter to a 24-bit output at the final output word rate.
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| Part | Description | Resolution (bits) | Dynamic Range (dB) | THD (dB) | Power Consumption Per Channel (mW) | Signal Range (V) |  Package |
|---|---|---|---|---|---|---|---|
| CS5374 | Dual Hydrophone Amplifier and ADC | 24 | 124 | -118 | 32.5 | 5 Vp-p diff | 48 QFN |
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