CS5378

Highly Integrated, Multi-Function Decimation Filter with PLL

Overview

Description

The CS5378 is a multifunction digital filter utilizing a low-power signal processing architecture to achieve efficient filtering for Delta-Sigma modulators. Digital filter coefficients for the FIR and IIR filters are included on-chip or can be programmed for custom applications. Using the on-chip selectable coefficient sets, the digital filter decimation ratios produce output word rates ranging from 4,000 SPS to 1 SPS, resulting in measurement bandwidths ranging from 1,720 Hz down to 430 mHz.

The CS5378 provides highly integrated peripherals that simplify system design by offering selectable digital filter decimation ratios, offset and gain corrections, a CS5378 digital test D/A bit-stream signal generator, a time-break controller, eight general-purpose I/O pins and an on-chip PLL and SPI port.

The CS5373A Delta-Sigma modulator with integrated test DAC and the CS5378 digital filter are the foundation of our Single-S™ seismic platform. When combined with the CS3301/02 differential amplifiers, this chipset can easily and quickly create a flexible high-resolution single-sensor measurement system for seismic and geophysical data acquisition.

Features

• Single-channel digital decimation filter
• Multiple on-chip FIR and IIR coefficient sets
• Programmable coefficients for custom filters
• Synchronous operation
• Selectable-output word rate (SPS)
• 4,000, 2,000, 1,000, 500, 333 and 250 SPS
• 200, 125, 100, 50, 40, 25, 20, 10, 5 and 1 SPS
• Integrated PLL for clock generation
• 1.024 MHz, 2.048 MHz or 4.096 MHz input
• Standard clock or Manchester-encoded input
• Digital calibration, gain and offset correction
• Digital test bit-stream signal generator
• Sine wave or impulse output mode
• Programmable waveform data
• Ideal for use with the CS5373A Seismic Test DAC
• Time break controller, 8 general-purpose I/O
• Microcontroller or EEPROM configuration
• Low-power consumption
• 20 mW at 500 SPS OWR
• Flexible-power supplies
• Small footprint: 28-pin SSOP

Diagram