CS5376A

Highly Integrated, Multi-Function 4-Channel Decimation Filter

Overview

Description

The CS5376A is a multifunction digital filter using a low-power signal processing architecture to achieve efficient filtering for up to four Delta-Sigma modulators. By combining the CS5376A with CS3301/02 differential amplifiers, the CS5371/72 Delta-Sigma modulators and the CS4373A Delta-Sigma digital-to-analog (D/A) converters, a synchronous high-resolution multichannel measurement system can be designed quickly and easily.

Digital filter coefficients for the CS5376A FIR (finite impulse response) and IIR (infinite impulse response) filters are included on-chip for a simple setup, or they can be programmed for custom applications. Selectable digital filter decimation ratios produce output word rates from 4,000 samples per second (SPS) down to 1 SPS, resulting in measurement bandwidths ranging from 1,720 Hz to 430 mHz when using the on-chip coefficient sets.

The CS5376A includes integrated peripherals to simplify system design: offset and gain corrections; a test D/A converter bitstream generator; a time-break controller; 12 general-purpose input/output pins; and a secondary SPI port.

Features

• 3- or 4-channel digital decimation filter
• Multiple on-chip FIR and IIR coefficient sets
• Programmable coefficients for custom filters
• Synchronous operation
• Selectable-output word rate
• 4,000, 2,000, 1,000, 500, 333 and 250 SPS
• 200, 125, 100, 50, 40, 25, 20, 10, 5 and 1 SPS
• Digital calibration, gain and offset corrections
• Digital test bit-stream signal generator
• Sine wave or impulse output mode
• Programmable waveform data
• Ideal for use with the CS4373A Seismic Test DAC
• Time-break controller, general-purpose I/O
• Secondary SPI port
• Microcontroller or EEPROM configuration
• Low-power consumption
• 9.5 mW per channel at 500 SPS OWR
• Flexible-power supplies
• I/O interface: 3.3 V or 5 V
• Digital logic core: 3.0 V, 3.3 V or 5 V
• Small footprint: 64-pin TQFP

Diagram