24-Bit Variable Bandwidth A/D Converter Chipset

The CS5321 chipset functions as unique A/D converters intended for very high-resolution measurement of signals below 1500 Hz. 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 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.

• CMOS A/D converter chipset
• Dynamic range
  • 130 dB @ 25 Hz bandwidth
  • 121 dB @ 411 Hz bandwidth
• Delta-Sigma architecture
  • 4th-order modulator
  • Variable oversampling: 64X to 4096X
  • Internal track-and-hold amplifier
• CS5321 signal-to-distortion: 115 dB
• Clock jitter tolerant architecture
• Flexible filter chip
  • Hardware or software selectable options
  • 7 selectable filter corners (-3 dB) frequencies:
• 25, 51, 102, 205, 411, 824 and 1650 Hz
• Input voltage range: 4.5V
• Low power dissipation: <100 mW
• Package: 28-pin PLCC