12-Bit, 250-MSPS Analog-to-Digital Converter (ADC)

The ADS61B49 (ADS61B29) is a 14-bit

(12-bit) A/D converter with a sampling rate up to 250 MSPS. It combines high dynamic

performance and low power consumption in a compact 48-QFN package. An integrated

analog buffer makes it well-suited for multi-carrier, wide bandwidth communications

applications. The buffer maintains constant performance and input impedance across a

wide frequency range.

The ADS61B49 (ADS61B29) has fine gain

options that can be used to improve SFDR performance at lower full-scale input

ranges. It includes a dc offset correction loop that can be used to cancel the ADC

offset. Both Double Data Rate (DDR) LVDS and parallel CMOS digital output interfaces

are available. At lower sampling rates, the ADC automatically operates at scaled

down power with no loss in performance.

It includes internal references while

the traditional reference pins and associated decoupling capacitors have been

eliminated. The device is specified over the industrial temperature range (–40°C to

85°C).