Cirrus Logic CS5530-ISZ

The CS5530 is a highly integrated ΔΣ Analog-to-Digital Converter (ADC) which uses charge-balance techniques to achieve 24-bit performance. The ADC is optimized for measuring low-level unipolar or bipolar signals in weigh scale, process control, scientific, and medical applications. To accommodate these applications, the ADC includes a very-low-noise, chopper-stabilized instrumentation amplifier (12nV/√Hz @ 0.1Hz) with a gain of 64X. This device also includes a fourth-order ΔΣ modulator followed by a digital filter which provides twenty selectable output word rates of 6.25, 7.5, 12.5, 15, 25, 30, 50, 60, 100, 120, 200, 240, 400, 480, 800, 960, 1600, 1920, 3200, and 3840 Sps (MCLK = 4.9152 MHz). To ease communication between the ADC and a microcontroller, the converter includes a simple three-wire serial interface which is SPI and Microwire compatible with a Schmitt-trigger input on the serial clock (SCLK). High dynamic range, programmable output rates, and flexible power supply options make this device an ideal solution for weigh scale and process control applications.

• Chopper-stabilized Instrumentation Amplifier, 64X
• 12 nV/√Hz @ 0.1 Hz (No 1/f noise)
• 1200 pA Input Current
• Digital Gain Scaling up to 40X
• Delta-sigma Analog-to-digital Converter
• Linearity Error: 0.0015% FS
• Noise Free Resolution: Up to 19 bits
• Scalable VREF Input: Up to Analog Supply
• Simple Three-wire Serial Interface
• SPI and Microwire Compatible
• Schmitt-trigger on Serial Clock (SCLK)
• Onboard Offset and Gain Calibration Registers
• Selectable Word Rates: 6.25 to 3,840 Sps
• Selectable 50 or 60 Hz Rejection

• weigh scale
• process control
• scientific
• medical