TI ADS8318IBDGST

The ADS8318 is a 16-bit, 500-KSPS analog-to-digital converter. It operates with a 2.048-V to 5.5-V external reference. The device includes a capacitor based, SAR A/D converter with inherent sample and hold. The devices includes a 50-MHz SPI compatible serial interface. The interface is designed to support daisy chaining or cascading of multiple devices. Also a Busy Indicator makes it easy to synchronize with the digital host. The ADS8318 unipolar differential input range supports a differential input swing of -Vref to +Vref with a common-mode of +Vref/2. Device operation is optimized for very low power operation, and the power consumption directly scales with speed. This feature makes it attractive for lower speed applications. It is available in 10-pin MSOP and SON packages. The ADS8318 is a high-speed, low power, successive approximation register (SAR) analog-to-digital converter (ADC) that uses an external reference. The architecture is based on charge redistribution, which inherently includes a sample/hold function. The ADS8318 is a single channel device. The analog input is provided to two input pins: +IN and -IN. When a conversion is initiated, the differential input on these pins is sampled on the internal capacitor array. While a conversion is in progress, both +IN and -IN inputs are disconnected from any internal function. The ADS8318 has an internal clock that is used to run the conversion, and hence the conversion requires a fixed amount of time. After a conversion is completed, the device reconnects the sampling capacitors to the +IN and –IN pins, and the device is in the acquisition phase. During this phase the device is powered down and conversion data can be read. The device digital output is available in SPI compatible format. It easily interfaces with microprocessors, DSPs, or FPGAs. This is a low pin count device; however, it offers six different options for the interface. They can be grossly classified as CS mode (3- or 4-wire interface) and daisy chain mode. In both modes it can either be with or without a busy indicator, where the busy indicator is a bit preceeding the 16-bit serial data.

• 500-kHz Sample Rate
• 16-Bit Resolution
• Zero Latency at Full Speed
• Unipolar, Differential Input, Range: -Vref to Vref
• SPI Compatible Serial Interface with Daisy Chain Option
• 95.2dB SNR Typ at 10-kHz I/P
• –108dB THD Typ at 10-kHz I/P
• ±1.0 LSB Max INL
• ±0.75 LSB Max DNL
• Low Power Dissipation: 18 mW Typ at 500 KSPS
• Power Scales Linearly with Speed: 3.6 mW/100 KSPS
• Power Dissipation During Power-Down State: 0.25 μW Typ
• 10-Pin MSOP and SON Packages

• Battery Powered Equipments
• Data Acquisition Systems
• Instrumentation and Process Control
• Medical Electronics
• Optical Networking