CHIPSEA CS1237-SOP8

CS1237 is a high-precision, low-power Sigma-Delta ADC chip with one built-in Sigma-Delta ADC, one differential input channel, and one temperature sensor. The ADC employs a second-order Sigma-Delta modulator and achieves PGA amplification through a low-noise instrumentation amplifier architecture, with selectable gain settings of 1, 2, 64, and 128. At PGA=128, the effective resolution can reach 20 bits (operating at 5V). CS1237 features a built-in RC oscillator, eliminating the need for an external crystal. CS1237 supports multiple functional mode configurations via DRDY/DOUT and SCLK, including temperature sensing, PGA selection, ADC output data rate selection, and more. CS1237 features a power-down mode.

• Integrated crystal oscillator
• Integrated temperature sensor
• Power-down function
• 2-wire SPI interface, maximum rate 1.1MHz
• ADC features:
• 24-bit no missing codes
• Selectable PGA gain: 1, 2, 64, 128
• 1-channel 24-bit no missing code differential input, ENOB 20 bits (5V) / 19.5 bits (3.3V) at PGA=128
• P-P noise: PGA=128, 10Hz: 180nV
• INL less than 0.0015%
• Selectable output rate: 10Hz, 40Hz, 640Hz, 1.28kHz
• Internal short function

• Industrial process control
• Electronic scales
• Liquid/gas chemical analysis
• Blood analyzers
• Smart transducers
• Portable devices