DS90CR215MTD/NOPB (TEXAS INSTRUMENTS)

The DS90CR215MTD/NOPB is a Transmitter converts 21-bits of CMOS/TTL data into three LVDS (low voltage differential signalling) data streams. A phase-locked transmit clock is transmitted in parallel with the data streams over a fourth LVDS link. Every cycle of the transmit clock 21- bits of input data are sampled and transmitted. The multiplexing of the data lines provides a substantial cable reduction. Long distance parallel single-ended buses typically require a ground wire per active signal (and have very limited noise rejection capability). Thus, for a 21-bit wide data and one clock, up to 44 conductors are required. With the Channel Link chipset as few as 9 conductors (3 data pairs, 1 clock pair and a minimum of one ground) are needed. This provides a 80% reduction in required cable width, which provides a system cost savings, reduces connector physical size and cost and reduces shielding requirements due to the cables' smaller form factor.