CS5550K-ISZ

Analog To Digital Converters (ADC) Overview

The CS5550K-ISZ is a dual-channel, low-cost analog-to-digital converter (ADC) from Cirrus Logic. It integrates two delta-sigma modulators and a serial interface on a single chip. The device features adjustable input ranges for AIN1±, supporting GND-referenced signals with a single supply. An on-chip 2.5 V reference with a typical temperature coefficient of 25 ppm/°C is included. Power consumption is less than 12 mW with VD+ at 3.3 V. It operates within a temperature range of -40°C to +85°C and is housed in a 24-pin SSOP package.

Analog To Digital Converters (ADC) Feature Summary

• Dual-channel architecture with separate offset and gain calibration registers for each channel.
• On-chip 2.5 V voltage reference with 25 ppm/°C typical drift.
• Adjustable differential input range for AIN1± (500 mV P-P at Gain=10; 100 mV P-P at Gain=50).
• Simple three-wire digital serial interface compatible with microcontrollers.

Analog To Digital Converters (ADC) Applications

• Electronic scales and weighing systems.
• Industrial process control requiring high precision.
• Energy metering applications.

Analog To Digital Converters (ADC) Procurement Notes

Verify component authenticity due to potential availability issues. Confirm the specific suffix 'K' indicates lead-free composition as per the ordering information. Ensure the 24-pin SSOP package matches the design footprint. Check for moisture sensitivity level requirements during storage and handling.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a dual-channel ADC with integrated calibration is required. Ensure the system clock frequency allows DCLK to remain between 2.5 MHz and 5 MHz. Verify that the external reference or internal 2.5 V reference meets the accuracy needs, as linearity is guaranteed within ±0.1% only after calibration.

Analog To Digital Converters (ADC) Part Context

The CS5550K-ISZ belongs to the CS5550 series of low-cost ADCs. The 'ISZ' suffix denotes the 24-pin SSOP package and industrial temperature range (-40°C to +85°C). The 'K' suffix typically indicates lead-free manufacturing compliance. This part is designed for cost-sensitive applications requiring moderate resolution and dual-channel capability.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternatives based on pin compatibility, package type (24-SSOP), and similar delta-sigma architecture if direct replacement is necessary.

Analog To Digital Converters (ADC) FAQ

What is the maximum master clock frequency for the CS5550?

The master clock frequency (MCLK) can range from 2.5 MHz to 5 MHz when using the internal gate oscillator. If an external clock is used, it can range up to 20 MHz, provided the K divider ensures DCLK remains between 2.5 MHz and 5 MHz.

How does the CS5550 handle calibration?

The CS5550 supports digital offset and gain calibration. Separate registers store calibration values for each channel. Offset calibration requires grounding the inputs, while gain calibration requires applying a known positive DC voltage. The DRDY bit indicates when calibration is complete.

What is the power consumption of the CS5550?

Power consumption is less than 12 mW when VD+ is 3.3 V. At VD+ = 5 V, active state power consumption is approximately 21 mW. Stand-by state consumes 6.75 mW, and sleep state consumes 10 µW.