DS90CR482 48-Bit LVDS Channel Link Deserializer - 65 - 112 MHz | TI.com

DS90CR482
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48-Bit LVDS Channel Link Deserializer - 65 - 112 MHz

 

Recommended alternative parts

  • DS90CR481  -  Companion 48-bit channel link serializer

Description

The DS90CR481 transmitter converts 48 bits of CMOS/TTL data into eight LVDS (Low Voltage Differential Signaling) data streams. A phase-locked transmit clock is transmitted in parallel with the data streams over a ninth LVDS link. Every cycle of the transmit clock 48 bits of input data are sampled and transmitted. The DS90CR482 receiver converts the LVDS data streams back into 48 bits of LVCMOS/TTL data. At a transmit clock frequency of 112MHz, 48 bits of TTL data are transmitted at a rate of 672Mbps per LVDS data channel. Using a 112MHz clock, the data throughput is 5.38Gbit/s (672Mbytes/s). At a transmit clock frequency of 112MHz, 48 bits of TTL data are transmitted at a rate of 672Mbps per LVDS data channel. Using a 66MHz clock, the data throughput is 3.168Gbit/s (396Mbytes/s).

The multiplexing of 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 48-bit wide data and one clock, up to 98 conductors are required. With this Channel Link chipset as few as 19 conductors (8 data pairs, 1 clock pair and a minimum of one ground) are needed. This provides an 80% reduction in 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.

The 48 CMOS/TTL inputs can support a variety of signal combinations. For example, 6 8-bit words or 5 9-bit (byte + parity) and 3 controls.

The DS90CR481/DS90CR482 chipset is improved over prior generations of Channel Link devices and offers higher bandwidth support and longer cable drive with three areas of enhancement. To increase bandwidth, the maximum clock rate is increased to 112 MHz and 8 serialized LVDS outputs are provided. Cable drive is enhanced with a user selectable pre-emphasis feature that provides additional output current during transitions to counteract cable loading effects. Optional DC balancing on a cycle-to-cycle basis, is also provided to reduce ISI (Inter-Symbol Interference). With pre-emphasis and DC balancing, a low distortion eye-pattern is provided at the receiver end of the cable. A cable deskew capability has been added to deskew long cables of pair-to-pair skew of up to +/−1 LVDS data bit time (up to 80 MHz Clock Rate). These three enhancements allow cables 5+ meters in length to be driven.

The chipset is an ideal means to solve EMI and cable size problems associated with wide, high speed TTL interfaces.

Features

  • 3.168 Gbits/sec Bandwidth with 66 MHz Clock
  • 5.376 Gbits/sec Bandwidth with 112 MHz Clock
  • 65 - 112 MHz Input Clock Support
  • LVDS SER/DES Reduces Cable and Connector Size
  • Pre-Emphasis Reduces Cable Loading Effects
  • Optional DC Balance Encoding Reduces ISI Distortion
  • Cable Deskew of +/−1 LVDS Data Bit Time (up to 80 MHz Clock Rate)
  • 5V Tolerant TxIN and Control Input Pins
  • Flow Through Pinout for Easy PCB Design
  • +3.3V Supply Voltage
  • Transmitter Rejects Cycle-to-Cycle Jitter
  • Conforms to ANSI/TIA/EIA-644-1995 LVDS Standard

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Parametrics

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Part number Order Function Protocols Parallel bus width (bits) Signaling rate (Mbps) Input signal Output signal Package Group Operating temperature range (C) Rating
DS90CR482 Order now Deserializer     Channel-Link I     48     5376     LVDS     LVCMOS     TQFP | 100     -10 to 70     Catalog    
DS90CR481 Samples not available Serializer     Channel-Link I     48     5376     LVCMOS     LVDS     TQFP | 100     -10 to 70     Catalog