ADS1218数据手册集成电路（IC）的模数转换器（ADC）规格书PDF

描述 Description

The ADS1218 is a precision, wide dynamic range, delta-sigma, Analog-to-Digital (A/D) converter with 24-bit resolution and Flash memory operating from 2.7V to 5.25V supplies. The delta-sigma, A/D converter provides up to 24 bits of no missing code performance and effective resolution of 22 bits. The eight input channels are multiplexed. Internal buffering can be selected to provide a very high input impedance for direct connection to transducers or low-level voltage signals. Burnout current sources are provided that allow for the detection of an open or shorted sensor. An 8-bit Digital-to-Analog (D/A) converter provides an offset correction with a range of 50% of the FSR (Full-Scale Range). The PGA (Programmable Gain Amplifier) provides selectable gains of 1 to 128 with an effective resolution of 19 bits at a gain of 128. The A/D conversion is accomplished with a second-order delta-sigma modulator and programmable sinc filter. The reference input is differential and can be used for ratiometric conversion. The on-board current DACs (Digital-to-Analog Converters) operate independently with the maximum current set by an external resistor. The serial interface is SPI-compatible. Eight bits of digital I/O are also provided that can be used for input or output. The ADS1218 is designed for high-resolution measurement applications in smart transmitters, industrial process control, weight scales, chromatography, and portable instrumentation.

特性 Features

• 24 BITS NO MISSING CODES
• 0.0015% INL
• 22 BITS EFFECTIVE RESOLUTION (PGA = 1), 19 BITS (PGA = 128)
• 4K BYTES OF FLASH MEMORY PROGRAMMABLE FROM 2.7V TO 5.25V
• PGA FROM 1 TO 128
• SINGLE CYCLE SETTLING MODE
• PROGRAMMABLE DATA OUTPUT RATES UP TO 1kHz
• PRECISION ON-CHIP 1.25V/2.5V REFERENCE: ACCURACY: 0.2% DRIFT: 5ppm/°C
• EXTERNAL DIFFERENTIAL REFERENCE OF 0.1V TO 2.5V
• ON-CHIP CALIBRATION
• PIN-COMPATIBLE WITH ADS1216
• SPI™ COMPATIBLE
• 2.7V TO 5.25V
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SPI is a trademark of Motorola.