CS5321/22

24-Bit Geophysical, Single-Channel A/D Converter Chipset

Overview

Description

The CS5321/22 chipset functions as unique analog-to-digital (A/D) converters intended for very high-resolution measurement of signals below 1,600 Hz. It is specifically designed for applications that require both a high dynamic range and a low total harmonic distortion. The chipset performs sampling, A/D conversion and anti-alias filtering.

The CS5321 uses Delta-Sigma modulation to produce highly accurate conversions. The Delta-Sigma modulator oversamples, virtually eliminating the need for external analog anti-alias filters.

The CS5322 linear-phase FIR (finite impulse response) digital filter decimates the output to any one of seven selectable update periods: 16, 8, 4, 2, 1, 0.5 and 0.25 milliseconds. Data is output from the digital filter in a 24-bit serial format.

Features

• CMOS A/D converter chipset
• Dynamic range
• 130 dB at 25 Hz bandwidth
• 121 dB at 411 Hz bandwidth
• Delta-Sigma architecture
• Fourth-order modulator
• Variable oversampling: 64x to 4,096x
• Internal track-and-hold amplifier
• CS5321 signal-to-distortion: 115 dB
• Clock-jitter-tolerant architecture
• Input Voltage Range ±4.5 V
• Flexible filter chip
• Hardware or software selectable options
• Seven selectable filter corners (-3 dB) frequencies: 25 Hz, 51 Hz, 102 Hz, 205 Hz, 411 Hz, 824 Hz, and 1650 Hz
• Input voltage range: 4.5 V
• Low power dissipation: <100 mW
• Package: 28-pin PLCC

Diagram