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Product Description

Chip Function Description
The CS1238 is a high-precision, low-power analog-to-digital converter (ADC) chip with two differential input channels, a built-in temperature sensor, and a high-precision oscillator.
The CS1238's PGA can be selected from 1, 2, 64, or 128, with 128 being the default.
The CS1238's ADC data output rate can be selected from 10Hz, 40Hz, 640Hz, and 1.28kHz, with 10Hz being the default.
The MCU can communicate with the CS1238 via the 2-wire SPI interface (SCLK, DRDY/DOUT) to configure the CS1238, such as channel selection, PGA selection, and output rate selection.

1.1 Key Chip Features
? Built-in crystal oscillator
? Integrated temperature sensor
? Power-down function
? 2-wire SPI interface, maximum speed 1.1MHz
ADC Features:
? 24-bit no missing codes
? Selectable PGA gain: 1, 2, 64, 128
? Integrated two-channel 24-bit differential input with no missing codes. ENOB (when PGA = 128) is 20.7 bits (5V operation) and 20.2 bits (3.3V operation).
? P-P noise: PGA = 128, 10Hz: 150nV
? INL less than 0.0015%
? Selectable output rates: 10Hz, 40Hz, 640Hz, 1.28kHz
? Internal short-circuit protection

1.2 Chip Applications
? Industrial Process Control
? Electronic Scales
? Liquid/Gas Chemical Analysis
? Blood Meters
? Smart Transducers
? Portable Devices

It comes with an external voltage regulator and uses the external voltage (2.5V) of the TL431 chip as the excitation source for the external pressure sensor, making the voltage more stable.

Product Photos

CS1238 24-bit ADC module onboard TL431 external reference chip dual-channel load sensing 24bit

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Product Description