The DS90CR217 (see DS90CR217/218A datasheet) transmitter converts 21 bits of CMOS/TTL data into three LVDS (Low Voltage Differential Signaling) data streams. A phaselocked 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 DS90CR218 receiver converts the three LVDS data streams back into 21 bits of CMOS/TTL data. At a transmit clock frequency of 75 MHz, 21 bits of TTL data are transmitted at a rate of 525 Mbps per LVDS data channel. Using a 75 MHz clock, the data throughput is 1.575 Gbit/s (197 Mbytes/sec). Complete specifications for the DS90CR217 are located in the DS90CR217/DS90CR218A datasheet. The DS90CR217 supports clock rates from 20 to 85 MHz. This chipset is an ideal means to solve EMI and cable size problems associated with wide, high-speed TTL interfaces.