Serial interfaces between PCs or embedded processors and their peripherals are hot, and with good reason: they save power, space, and cost compared to wide parallel busses. A trio of similar parts from Maxim shows how advanced the interface ICs now are. Their MAX9234, MAX9236, and MAX9238—which differ in some details and features—provide the deserializer function in a 21-bit, dc-balanced LVDS format. Each IC deserializes three LVDS serial inputs into 21 singleended LVTTL/LVCMOS outputs and communicates over a three-wire twisted pair or differential line. Equally critical for may of the applications, the 3.3V ICs support hot-swapping for each of test and maintenance in the field.
Typical application for these ICs is driving a 480_ 800 or 768_1024 pixel LCD. Maximum aggregate payload data rate is 1.386Gbps. The dc-balance design allows eigneers to use isolation between the serializer and deserializer and ac coupling, which reduces bit errors due to ground shift and common mode problems. In addition, the operating frequency of these devices can be reprogrammed in circuit, on-the-fly during operation.
