CM1348 ΔΣ ADC ,16-channel ，24-bit

Overview

CM1348 is a low-noise, 24-bit ΔΣ ADC that supports 16 single-ended inputs or 8 differential input pairs. It can operate in either single conversion mode or continuous conversion mode: in single conversion mode, the maximum data rate is 29.5kSPS, while in continuous conversion mode, the maximum data rate is 125kSPS. The device includes an internal PLL circuit, which can boost a 32.768kHz crystal oscillator clock to 15.729MHz for use as the system clock. It can also accept an external clock up to 16MHz for the system clock.

CM1348 has a system self-test function, allowing the reading of supply voltage, internal temperature, reference voltage, gain, offset voltage, and other data through registers. It supports serial SPI communication, enabling configuration of input channels, data rates, GPIO, detection functions, etc.

Features

• 24-bit no missing codes

• Fixed channel mode or auto scan mode

• Fixed channel mode data rate: 125kSPS

• Auto scan mode data rate: 29.5kSPS/channel

• Single conversion data stability

• 16 single-ended inputs or 8 differential input pairs

• Unipolar (5V) or bipolar (±2.5V) operating voltage

• Low noise: 2.8μVrms (1.8kSPS)

• INL: 0.0003%

• Offset voltage temperature drift: 0.02μV/°C

• Gain temperature drift: 0.4ppm/°C

• Open-circuit detection function

• Conversion start control pin

• Internal signals can be output to external circuitry for signal conditioning

• On-chip temperature, reference voltage, offset voltage, ADC gain, and power supply voltage readback

• Self-test

• Conversion power consumption: 21mW

• Standby, sleep, and power-off modes

• 8 GPIO ports

• Crystal oscillator or external clock: 32.768kHz

Applications:

• Medical, avionics, and process control

• Mechanical and system monitoring

• High-speed multi-channel scanning instruments

• Industrial systems

• Laboratory measurement systems

QFN10