CS1242 – 24-bit High-Precision Sigma-Delta ADC with Dual Differential Input – CHIPSEA

The CS1242 from CHIPSEA is a high-performance 24-bit Sigma-Delta analog-to-digital converter (ADC) designed for precision signal acquisition and measurement applications. It integrates a low-noise programmable gain amplifier (PGA), dual-channel differential inputs, and an advanced noise-reduction filter. With an effective number of bits (ENOB) up to 22, the CS1242 is ideal for industrial, scientific, and medical applications requiring accurate analog signal digitization.

The chip supports a programmable gain range from 1 to 128x and offers output data rates from 1.875Hz to 30Hz. It features a built-in 50Hz/60Hz notch filter (attenuation up to –90dB) for interference rejection in power-line environments. Communication with the host controller is via a 5-wire SPI interface, allowing flexible integration into various embedded systems. Additionally, it supports a wide external reference voltage range from 0.1V to 5V and includes auto-calibration for consistent performance.

🔧 Key Features:

• 24-bit resolution with 22-bit effective precision (ENOB)

• Integrated low-noise PGA with gain settings from 1x to 128x

• Dual differential analog input channels

• Integrated 50Hz/60Hz notch filter (–90dB)

• Programmable output data rate: 1.875Hz to 30Hz

• INL less than 0.0015% for high linearity

• Single clock cycle ready

• 5-wire SPI digital interface

• Supports external reference voltage: 0.1V to 5V

• Built-in calibration function

• Ultra-low power consumption: as low as 0.6mW

📌 Typical Applications:

• Industrial precision control systems

• Electronic weighing scales

• Medical instrumentation (blood analyzers, chemical analysis)

• Environmental monitoring sensors

• Smart transmitters

• Portable measurement devices