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.
SPI is a trademark of Motorola.
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|Sample Rate (Max) (kSPS)|
|Number of input channels|
|Operating temperature range (C)|
|Approx. price (US$)|
|Power consumption (Typ) (mW)|
|Package size: mm2:W x L (PKG)|
|Input range (Max) (V)|
|Input range (Min) (V)|
|Analog voltage AVDD (Min) (V)|
|Analog voltage AVDD (Max) (V)|
|Digital supply (Min) (V)|
|Digital supply (Max) (V)|
|INL (Max) (+/-LSB)|
|-40 to 85|
|TQFP | 48|
|9.91 | 1ku|
|48TQFP: 81 mm2: 9 x 9 (TQFP | 48)|
50/60 Hz Rejection
Excitation Current Sources (iDACs)