JAJSDZ9 October 2017 ADS54J64
PRODUCTION DATA.
The ADS54J64 is a quad-channel device with a complex digital down-converter (DDC) and digital decimation to allow flexible signal processing to suit different usage cases. Each channel is composed of two interleaved analog-to-digital converters (ADCs) sampling at half the input clock rate. The 2x interleaved data are decimated by 2 to provide a processing gain of 3 dB. The decimation filter has a programmable option to be configured as low pass (default) or high pass. In default mode, the device operates in DDC mode 0, where the input is mixed with a constant frequency of –fS / 4 and transmitted as complex IQ. In DDC bypass mode (mode 8), the DDC is bypassed and the 2x decimated data are available on the JESD output. The different operational modes of the ADS54J64 are listed in Table 1.
The ADS54J64 can also be operated in a dual-channel interleaved mode (dual mode), in which two channels are averaged and the 2x interleaved and averaged data are available directly at the JESD output.