Texas Instruments ADS5277

The ADS5277 is a high-performance, CMOS, 65MSPS, 8-channel analog-to-digital converter (ADC). Internal references are provided, simplifying system design requirements. Low power consumption allows for the highest of system integration densities. Serial LVDS (low-voltage differential signaling) outputs reduce the number of interface lines and package size. An integrated phase lock loop (PLL) multiplies the incoming ADC sampling clock by a factor of 12. This high-frequency clock is used in the data serialization and transmission process. The word output of each internal ADC is serialized and transmitted either MSB or LSB first. The word consists of 12 bits, of which the 2 LSBs are zeroes and the remaining 10 bits correspond to the output from the ADC. This formatting is done in order to keep the interface compatible with the 12-bit parts of the family. In addition to the eight data outputs, a bit clock and a word clock are also transmitted. The bit clock is at 6x the speed of the sampling clock, whereas the word clock is at the same speed of the sampling clock. The ADS5277 provides internal references, or can optionally be driven with external references. Best performance is achieved through the internal reference mode. The ADS5277 is available in a PowerPAD TQFP-80 package and is specified over a -40C to 85C operating range.