Jesd204b vs lvds driver

Simplified diagram of lvds driver and receiver connected via 100w differential impedancemedia lvds outputs consist of a current source nominal 3. The max9124 quad low voltage differential signaling lvds line driver is ideal for applications requiring high data rates, low power, and low noise. Electrical engineering stack exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Implementing jesd204b sysref and achieving deterministic. The hmc7043 is designed to meet the requirements of multicarrier gsm and lte base station designs, and offers a wide range of clock management and distribution features to simplify baseband and radio card clock tree designs. This protocol offers higher bandwidth, low io count and supports scalability in both number of lanes and data rates. Jesd204b clock generator with 14 lvdshstl outputs data. Jesd204b clock generator with 14 lvdshstl outputs data sheet ad9528 rev. A standard lvds driver from the lmk04828 clock chip can be used as sysref, as shown in figure 3. Lvds interface ic are available at mouser electronics. Synthesis vivado synthesis support provided by xilinx at the xilinx support web page notes.

In this post, we are going to take a step back and examine how to convert between lvpecl, vml, cml, lvds, and sublvds interfaces. The jesd204b intel fpga ip is a highspeed pointtopoint serial interface for digitaltoanalog dac or analogtodigital adc converters to transfer data to fpga. The max9164 highspeed lvds driverreceiver is designed specifically for lowpower pointtopoint applications. Name has been derived from jedec joint electron device engineering council low voltage differential signaling. Welcome back to the get connected blog series here on analog wire.

This board can drive a single channel or a dual channel lvds lcd. The device features an independent differential driver and receiver. This greatly simplifies the layout and the clock to data phase relationship. This standard is expected to replace the use of lvds interfaces in many of todays wireless, medical, and aerospace and defense applications. Adis low voltage differential signaling lvds offer designers robust, high speed signaling singleended to differential solutions for pointtopoint applications. On ice40 fpgas, however, differential outputs are constructed using a. For some differential io standards, such as lvds, the output driver is actually a current source. Jesd204bc link transmit peripheral analog devices wiki. Since converter resolution and speed have increased, there is a growing demand for a more efficient interface, which has caused a strong shift toward using jesd204b. To increase the performance of software radio and electronic warfare systems, it has.

For a complete listing of supported devices, see the vivado ip catalog. New applications are driving the need for wideband data converters with increasingly higher sampling frequencies and data resolutions. However, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. An old fluorescentbacklit lcd panel out of a toshiba pt200a a transflective. The use of lvds increased in the late 1990s and the serial lvds vs. If driving two output loads or trace length is longer than. The altera jesd204b ip core offers two design examples. Video converter, dvi to lvds, hdmi to lvds,vga to lvds. In the previous get connected blog post, serdes xaui to sfi design, we took an indepth look at using the tlk10232 in a xaui to sfi protocol converter design. Driver dc specifications table 1 gives the lvds reduced range link driver dc specifications for a. Jesd204b vs lvds difference between jesd204b and lvds. Xilinx working with our analog partners provides a rich set of jesd204b reference designs and highspeed analog fmc cards to jump start development. Watch the ad9250 a dual, 14bit, 250 msps, adc with a jesd204b high speed serial interface connected to a xilinx kc705 development system run the analog devi. Jesd204a serial interface for data converters, april 2008.

Jesd204b is a rapidly emerging standard for interfacing analog data converters to fpgas using highspeed serial transceivers. These adc devices are available with either lvds or jesd204b. Long thought to be not possible or easy, i will show it is actually quite easy. Demystifying the jesd204b highspeed data converterto. Differential impedance media nationals lvds outputs consist of a current source nominal 3. Cmos vs lvds oscillator electrical engineering stack. The pll reconfiguration and transceiver reconfiguration controller instances are. Serial lvds interface considerations for wideband data converter applications. The lvds interface also improved noise coupling on. Sn65lvds049 duallvds differential drivers and receivers. Lvds is quite straight forward, and is just parallel data serialised 7. Jesd204b transmit linux driver support restrictions during the design of the peripheral the deliberate decision was made to support only a subset of the features mandated by the jesd204b standard for transmitter logic devices. Jesd204b, a multigigabit serial data link between the data.

For better analog video, try differential signaling. Very highspeed sampling and serial adcs in embedded systems. The jesd204 and the jesd204b revision data converter serial interface standard was created through the jedec committee to standardize and reduce the number of data inputsoutputs between highspeed data converters and other devices, such as fpgas fieldprogrammable gate arrays. The sn65lvds049 device is a dual flowthrough 1 ds90lv049 compatible differential line driverreceiver pair that uses low up to 400mbps signaling rates voltage differential signaling lvds to achieve flowthrough pinout signaling rates as high as 400 mbps. When sl is high, the driver is reduce swing level 200mv.

Engineers and system designers now have three options to consider when designing in their fpgatoconverter links low voltage differential signaling lvds, cmos and jesd204b. While the current and power consumption remain relatively flat for lvds, the interface has an upper speed bound. The hmc7043 provides 14 low noise and configurable outputs to offer flexibility in interfacing with many different components. This elastic buffer stores the data until the data from the slowest lane arrives. Enhanced vled driver updates jfet constantcurrent source. The jesd204b ip core supports line rates of up to 12. All in all, the comparison of lvds to jesd204b is very similar to comparing pci to pci express take a look at the following table for the ads42jb69 dual 16bit, 250 msps adc and you decide. Jesd204b standard was revised with the publication of tiaeia644a choosing between series lvds and jesd204b interface in 2001. This specification describes the electrical and logical specifications of this interface. The transmission is pointtopoint, unidirectional, and is usually terminated at the destination with 50. Engineers and system designers now have three options to consider when designing in their fpgatoconverter links lowvoltage differential signaling lvds, cmos and jesd204b. The jesd204, jesd204a, jesd204b and the jesd204c data converter serial interface standard was created through the jedec committee to standardize and reduce the number of data inputsoutputs between highspeed data converters and other devices, such as fpgas fieldprogrammable gate arrays. You can find many driver boards for old lvds laptop displays on ebay for quite cheap, they can all be converted to vga, hdmi, dvi or dp or even all 4 on the same board if you wish, and theyre. Sysref capture delay 50 50 100 clkinpm v cm sysrefpm valid transition.

In addition, common highperformance metrics that are associated with high. The ip core can be configured as jesd204b transmitter for interfacing to dac device or jesd204b receiver for interfacing to. The jesd204 serial interface standard the latest version of which is the jesd204b revision was created under the auspices of the jedec committee to standardize and reduce the number of data inputsoutputs between highspeed data converters, such as analogtodigital converters and digitaltoanalog converters, and other. The max9124 is guaranteed to transmit data at speeds up to 800mbps 400mhz over controlled impedance media of approximately 100 the transmission media may be printed circuit pc board traces. The lvds clock tends to be 75mhz max, and data lines tend to top out at 525mhz 7x75m. The differential output impedance is typically 100 refer to table. Current mode logic cml, or sourcecoupled logic scl, is a differential digital logic family intended to transmit data at speeds between 312. Pg066 details the procedure for calculating the magnitude of endtoend latency of jesd204b systems, while simultaneously ensuring that latency is robustly repeatable. It is normally a clock pair, and 3 lvds pairs for 18bpp, or 4 lvds pairs for 24bpp, or 5 lvds pairs for 30bpp. Max maxfield, designline editor eetimes 12172014 04.

Lvds driver properties the characteristics of the mdtasd lvdsdrivers on an asd99d were assessed according to the specifications in the ieee p1596. Market forces continue to press for more features, functionality, and performance in a given system, driving the need for higher datahandling capacity. Implementing jesd204b sysref and achieving deterministic latency with adc32rf45. Monitoring a co sensor or any other gas sensor is a slow process so high communication rates are not required.

Enter the jedec standard jesd204 version b or simply jesd204b. The basic receiver has a high dc input impedance, so the majority of driver current flows across the 100w. Interface considerations for wideband dataconverter apps new applications are driving the need for wideband data converters with increasingly higher sampling frequencies. References jesd204 serial interface for data converters, april 2006.

Laying out the pcb for the jesd204b interface is quite a bit easier and provides much more functionality. The jesd204a jesd204b industry standard for serial interfaces was developed to address the problem of interconnecting the newest wideband data converters with other system ics in an efficient and cost saving manner. Jesd204 serial interface and jedec standard data converters. Jesd204b serial interface for data converters, august 2011. Jesd204b high speed adc interface standard cern indico. Lvds and lvpecl specifications and resistor termination information are available in the fpga dc and switching characteristics section of the data sheet. Its low swing and currentmode driver outputs create low noise and provide very low power consumption across frequency. This unidirectional serial interface runs at a maximum data rate of 17.

Jesd204b benefits 7 reducedsimplified pcb area reduced package size comparable power for large throughput scalable to higher frequencies simplified interface timing standard interface 3. This webcast will provide an overview of the jesd204 standard from its original version up to the current b revision. In systems using jesd204b sub class 1 interfaces to communicate sample data between data converters and xilinx devices, it might be preferable to employ a simple method of synchronizing the interface in a repeatable manner. The jesd204a industry standard for serial interfaces was developed to address the problem of interconnecting the newest wideband data converters with other system ics in an efficient and cost saving manner. Jesd204b introduces the sync signal october 19, 2016. This project is an experiment into the world of lvds laptop screens.