Hi Jari,
ADS7865 is a dual simultaneous sampling 2MSPS 12 bit device with 3+3 or 2+2 channels and parallel interface. Conversion time is as low as 406ns (13 clks at Fclk=32MHz). Full-scale Input range is +/-VREF; where VREF=2.5V; absolute input range -0.1 to AVDD=0.1V. The user controls/triggers the conversions by toggling the CONVST pin.
The ADS7882 is a single 12-bit SAR converter with a parallel interface, 0-2.5V input range, offering sampling rates up to 3 MSPS with conversion times to 280ns. The ADS7891 is a similar device with 14 bit resolution and 273ns conversion time.
Best Regards,
Luis