ADS1218是TI公司的一款精密ADC(<=10MSPS)产品，ADS1218是具有闪存、8 个通道、参考电压、缓冲器、2 个 IDAC、串行输出和数字 I/O 的超低功耗 24 位、780SPS ADC，本页介绍了ADS1218的产品说明、应用、特性等，并给出了与ADS1218相关的TI元器件型号供参考。
ADS1218 - 具有闪存、8 个通道、参考电压、缓冲器、2 个 IDAC、串行输出和数字 I/O 的超低功耗 24 位、780SPS ADC - 精密ADC(<=10MSPS) - 模数转换器 - TI公司（Texas Instruments，德州仪器）
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.
- 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
- < 1mW POWER CONSUMPTION
- APPLICATIONS
- INDUSTRIAL PROCESS CONTROL
- LIQUID/GAS CHROMATOGRAPHY
- BLOOD ANALYSIS
- SMART TRANSMITTERS
- PORTABLE INSTRUMENTATION
- WEIGHT SCALES
- PRESSURE TRANSDUCERS
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