ADS1217中文资料8 通道 24 位模数转换器数据手册TI规格书

描述 Description

The ADS1217 is a precision, wide dynamic range, delta-sigma, Analog-to-Digital (A/D) converter with 24-bit resolution 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 Converter (DAC) 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 2nd-order delta-sigma modulator and programmable sinc filter. The reference input is differential and can be used for ratiometric cancellation. The onboard current DACs 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 ADS1217 is designed for high-resolution measurement applications in smart transmitters, industrial process control, weigh scales, chromatography, and portable instrumentation.

特性 Features

• 24 BITS NO MISSING CODES
• INL: 0.0012% of FSR max
• FULL-SCALE INPUT = ±2VREF
• PGA FROM 1 TO 128
• 22 BITS EFFECTIVE RESOLUTION (PGA =1), 19 BITS (PGA = 128)
• SINGLE CYCLE SETTLING MODE
• PROGRAMMABLE DATA OUTPUT RATES UP TO 1kHz
• ON-CHIP 1.25V/2.5V REFERENCE
• ON-CHIP CALIBRATION
• SPI COMPATIBLE
• POWER SUPPLY: 2.7V to 5.25V
• DD = 3V
• APPLICATIONS
• INDUSTRIAL PROCESS CONTROL
• LIQUID/GAS CHROMATOGRAPHY
• BLOOD ANALYSIS
• SMART TRANSMITTERS
• PORTABLE INSTRUMENTATION
• WEIGH SCALES
• PRESSURE TRANSDUCERS

简介

ADS1217属于集成电路（IC）的模数转换器（ADC）。由TI制造生产的ADS1217模数转换器（ADC）模数转换器（ADC、A/D 或 A 转 D）对模拟信号进行采样，例如由麦克风采集的声音或传感器的输出，然后将其转换为数字信号。一般来说，数字输出是二进制补码二进制数，与输入成比例。输入类型可能是差分、伪差分或单端输入。模数转换器可按照位数、采样率、输入数、接口、转换器数和架构（例如自适应增量、双斜率、折叠、流水线、SAR、三角积分、两步式）进行选择。