High-speed SAR ADCs with integrated reference buffer and integrated LDO

The ADS8900B, ADS8902B, and ADS8904B (ADS890xB), from Texas Instruments, belong to a family of pin-to-pin compatible, high-speed, high-precision SAR ADCs with an integrated reference buffer and integrated LDO. These devices support unipolar, fully differential, analog input signals with ±1ppm INL and 104.5dB SNR specifications under typical operating conditions. The integrated LDO enables single-supply operation with low power consumption. The integrated reference buffer supports burst-mode data acquisition with 20-bit precision for the first sample. External reference voltages in the range 2.5V to 5V are supported, offering a wide selection of input ranges without additional input scaling. The integrated multiSPI digital interface is backward-compatible to the traditional SPI protocol. Additionally, configurable features simplify board layout, timing, and firmware, and support high throughput at lower clock speeds. The multiSPI digital interface allows for easy interface with a variety of microcontrollers, digital signal processors, and field-programmable gate arrays. The family is offered in a space-saving, 4mm × 4mm, VQFN package, and is specified over the extended temperature range of –40C to +125C.