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Questions tagged [lvds]

LVDS stands for Low Voltage Differential Signalling. It is a popular high-speed (>100 Mb/s) way to connect chips.

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1answer
206 views

Poor man's clock MUX with an LVDS input

I want to send two different 10MHz clock signals to a device. My board have tight volume and power constraints and I would rather not use a complicated clock buffer/PLL/MUX IC. The first source have ...
3
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1answer
524 views

Convert single-ended (analog) signal to LVDS

I am looking for recommendation of a converter/cable to convert a digital pulse to LVDS. Attachment is the schematic of the whole design. Basically, my task is to measure the photon arrival time, ...
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1answer
285 views

How to generate a continuous clock from one that periodically turns off?

I have a LVDS clock signal that is gated about ever 30us. This is a MIPI D-PHY clock that switches from HS mode to LP mode when the data lanes go to LP mode (and are auto-clocked). The problem is that ...
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1answer
929 views

What type of cable/connector is this 30 PIN LCD display cable?

I need help identifying the type of cable this is. It is used to connect an LCD display panel to a processor board. The width of each connector is about 15 mm and each end attaches to a 30 PIN ...
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0answers
59 views

24-30pin connector for digital picture frame

Hey all I have 3 27" lcd panels that I will be making digital picture frames out of and I am looking for advice on what i can use in order to use only 1 cable going to the digital picture frame since ...
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1answer
322 views

LVDS-SPI bridge, asic or FPGA, and what FPGA

I'm going to develop a camera utilizing the NanEye 2D image sensor. This has LVDS interface. I'm using a MCU for data processing that does not have LVDS interface, but it has SPI and I2C. Therefore I ...
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1answer
65 views

How can I connect this LCD panel to my Raspberry Pi?

I want connect my Raspberry Pi to this LCD. How I can do this? I have read about lvds controller. Is this the solution to my problem? Could someone help me in my research? I'm Italian and I'm ...
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1answer
569 views

LVDS cable between a camera and a FPGA

I'm using a development kit which is made a camera board and a FPGA board. So far, in this kit, the camera board is directly plugged onto the FPGA board. I have tested a new code for my FPGA. ...
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1answer
172 views

Cables for LVDS RS-644

To use SPI over a 5m long cable we plan to use LVDS RS-644 which calls for a twisted-pair cable with 100ohm characteristic impedance. Evaluating our cable options we looked into Cat5 cable (...
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2answers
196 views

Interfacing an LVDS driver with an LVPECL receiver

I'm trying to understand how the below circuit allows interfacing LVDS levels with LVPECL levels. Assuming: Driver: Voh = 1.4V, Vol = 1V, Vcm = 1.2V Receiver: VBB = 2V After the transmission ...
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1answer
2k views

How to connect LVDS signals to oscilloscope?

I have a bunch of LVDS signals on a PCB I want to look at with a scope (without wanting to tear my hair out). They range in speed from hundreds of Hz to ~200 MHz. How can I do this in a way that will ...
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4answers
389 views

Self-clocking driver / transceiver

I'm looking for a way to transmit a clock signal and data over a single line, perhaps using a self-clocking signal such as Manchester coding. The design I'm working on has a number of chained units, ...
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1answer
2k views

LVDS Displays - Swapped EVEN and ODD Channels?

A friend of mine gave me 2 LCD display driver boards (VGA/HDMI to LVDS). One has RTD2553V chip (from Realtek) and the other has RTD2660H (I cannot share the datasheets because they are not public). ...
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0answers
267 views

Sometimes LCD display is initialized half white

Rarely right after the startup my LCD display shows half the screen completely white, the other half shows the software without problems. The main problem here is that to see this problem I have to ...
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2answers
303 views

Can series capacitors (DC block) be used to clean up LVDS signals over long distance

I have a system driving LVDS over ~ 140 ft of CAT6 cable. I am using the SN65LVDS series devices from TI to accomplish this. I'm aware that there will be low-frequency distortion in the signal at ...
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1answer
275 views

iCE40 LVDS clock input

I'm trying to figure out how to correctly connect 200MHz LVDS oscillator (DSC1103CE1-200.0000T Datasheet) to ICE40LP1K-QN84 FPGA. After reading Lattice's guide to differential signals (Link) this is ...
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2answers
130 views

Input clock of a Direct Digital Synthesizer

I need to create a circuit based around one of Analog Digital DDSs (AD9102) to create a sinusoidal signal at 150kHz. For this purpose I think that a clock line at around 10MHz would be sufficient. I ...
4
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1answer
1k views

LVDS_25 voltage range

I understand that thee voltage level for LVDS standard has a typical offset voltage of 1.25V and voltage swing of 350mV. However, when I am doing some pin mapping on Xilinx FPGA, I encountered some ...
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1answer
1k views

Can I use an ethernet jack to send LVDS signals?

I would like to use an Ethernet jack for the form factor and CAT5e+ cable properties (shielded/twisted, characteristic impedance, etc) to send LVDS signals over a long length of cable (100+ ft). When ...
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1answer
843 views

Voltage Swing in Differential Signal

My Doubt is in voltage swing of a differential signal. Here is the scenario :- The voltage swing of LVPECL is 800 mV. Assume it as my driver. So, in case I want to drive an LVDS input, I would go ...
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1answer
834 views

Can I Hook a Raspberry Pi Zero to a Laptop Display Via HDMI to TTL and TTL to LVDS?

Dilemma: I have a project in which I am trying to use a Raspberry Pi Zero to display static content through a laptop screen. I am trying to make my unit as thin as possible and use as little power as ...
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1answer
333 views

LVDS signal distortion w.r.t switching power supply

We are using DC-DC switching regulators on board (switching freq. of regulators are ~540KHz). There is periodic noise in power/gnd at 540Khz. If we change the switching freq. of regulator, the ...
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3answers
886 views

Is it possible to extend LVDS and SPI to 3 meter distance

In a hardware design application, we need to extend below signals to 3-meter cable. LVDS data @ 720Mbps Clock: 72Mhz SPI signals So, I wanted to know Is it possible to extend above signal to 3-...
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1answer
634 views

LVDS signals having different ground reference with coupling capacitor

I'm simulating a LVDS driver connected to a LVDS receiver with a 100nF series coupling capacitor in between the +ve and -ve signal lines using the respective IBIS model of the same buffer. (DS25BR100 ...
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0answers
2k views

LCD driver board M.NT68676.2 issue: Screen compressed, fills only part of display

I am trying to build a portable Raspberry Pi/Retropie system with an LCD screen I got from my old laptop (the idea is to have a portable gaming console to be used in a car). To drive the screen, I am ...
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2answers
3k views

HDMI to LVDS converter [closed]

I am a software developer and now working on a touch screen based project of which I have no or little knowledge. Attached is the schematic of the circuit we obtained from chalkboard electronics. It ...
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3answers
625 views

CML/LVDS driver for several GHz, parasitic RC filter formed by terminating resistance and load capacitance

Update: Based on useful comments of The Photon, Andy aka and PlasmaHH. As I got, there is indeed the parasitic low-pass. There is no magic bullet that will mitigate it. Large receiver capacitance is ...
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1answer
1k views

STM32 FSMC/FMC and DS90CR285

I don't want to use an FPGA. I need to quickly put together a prototype that will relay DCMI data (small resolution camera sensor) to DS90CR285. Here performance doesn't matter that much – later it ...
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0answers
198 views

Half duplex to full duplex LVDS

Suppose I have a half-duplex LVDS source that I want to interface with a full-duplex LVDS device operating in a half-duplex capacity (i.e. the full-duplex device has both a TX and an RX interface, but ...
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2answers
1k views

How to Send Video from a Raspberry Pi (HDMI) to 20 pin LVDS

Through shenanigans, I have come to possess 4 small LCD screens. I've found the pin-out for video data on page 12 of this datasheet. I think it's LVDS. I'd like to know what I need to learn to be able ...
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2answers
67 views

What options do I have to combine and format 18 600Mbps ADC serial streams over QSFP+?

The 18 serial streams are not encoded or scrambled. The idea is to multiplex them onto one or more encoded serial streams at higher rates for onwards transmission over optical fiber.
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1answer
464 views

FPGA: Choose RAM or FIFO for ADC input to be filtered

I will connect an ADS4125 12-bit 125-MSPS ADC with 6-bit parallel DDR LVDS output, with an Altera MAX10 FPGA. The sampled data is over a duration of 100 us, and will be filtered in the FPGA. I will ...
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3answers
141 views

USB3 activity detection

Some USB hubs have status LED that shows activity. Let's say, I want to make a USB3 cable with status LED that would indicate any activity on the bus (changes of differential voltage). Is there a way ...
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1answer
253 views

Pulling RGB24 signal out directly instead of LVDS interface

I am designing a display driver board. I have used a HDMI receiver ADV7619 for the same, I am using HDMI input to my board coming from PC. This receiver has RGB and YCrCb signal out. I have already ...
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1answer
47k views

LVDS 30 pin cable confusion [closed]

I'm trying to salvage a Samsung LTN154AT07 LCD from a laptop. I've ordered an MT6820-B rev.3 universal LVDS driver and a 5A step-down module (XL4005), and I think I have a decent grasp of how ...
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3answers
394 views

Profiling for FPGA requirements for a high-performance camera

I would like to know how to do the profiling of an image acquisition and storing pipeline on an FPGA based system, capturing images from a CMOS image sensor through LVDS interface, do some basic image ...
5
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2answers
572 views

Inner layer routing of LVDS traces in between ground vias

I have ground vias underneath an ADC on a multi-layer board for thermal relief. I am using inner layers to route the LVDS signals for the ADC. The image shows diff pairs on layer 4, which is in ...
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1answer
1k views

How can I determine the the Wiring Configuration of an LVDT sensor?

I have an LVDT Sensor for measuring linear displacement similar to the one on the picture. The problem is that I don't have the manufacturer's wiring diagram and they don't provide it, because ...
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0answers
102 views

DisplayPort cable 2.5V for non standard use

I want to use a DisplayPort connector and cable for transmission of a custom 8b/10b protocol (not the DisplayPort protocol). Does anyone know if these cables are good for use at 2.5V instead of 3.3V ...
0
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1answer
136 views

Differential POE 1000base-t signaling through analog multiplexer

I want to make a test device which can route network inputs to one output. For example it could sit between two computers and a network switch. The TS3L301 looks promising, but I am unclear about the ...
4
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1answer
577 views

High-Speed PCB Design - Routing on Power Plane Layer?

I am working on designing my first high-speed PCB with 4 layers (in order): Top Layer: Single-ended/TTL signals Internal Layer 1: Power Plane (3.3V) Internal Layer 2: Ground Plane Bottom Layer: ...
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1answer
534 views

LVDS cable - Impedance measurement

I am using twisted pair cable for LVDS communication between the Host and the display. It was recommended that the differential impedance of cable should be 100ohm (+/-5%). Let me know how to ...
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1answer
844 views

How can I drive this laptop screen?

How can I drive this screen? It's a 1920x1200 display from an old Dell Inspiron 6000 which is now dead, but the screen is great and I want to use it in a project. Is that a standard (either physical ...
1
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1answer
634 views

Differential Signals (LVDS)

Talking about diff signals, we hear that they carry equal & opposite voltage. How will I conclude that referring the figure below :- What is the significance of common mode voltage in diff ...
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1answer
1k views

How can I understand the interface to connect from motherboard to lcd display?

I want to connect motherboard directly (without controller) to lcd display, i.e. this: http://www.panelook.com/LP173WF1-TLA2_LG%20Display_17.3_LCM_overview_18016.html Please give me the manual how ...
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1answer
2k views

Serial LVDS camera interface

I am interested in using the greyscale version (VM-010-BW-LVDS) of this camera module: VM-010: phyCAM-S camera module, WVGA monochrome I want to use the camera with external trigger (in snapshot ...
2
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1answer
150 views

what is the voltage direction and current direction of LVDS signal at particular time?

What is the voltage and current direction LVDS signal (how it is related) ? i.e at a time (t1) there is only one current direction and one voltage ( D+ or D-)
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1answer
563 views

CMOS vs LVDS oscillator

I am trying to select a 160MHz clock oscillator for my FPGA. The least expensive I found was either LVDS or LVPECL type for this frequency. I used a CMOS type before, so the output of the oscillator ...
7
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2answers
7k views

Transmitting HDMI/DVI over an FPGA with no support for TMDS

I'm hoping to be able to output HDMI/DVI-D for my next FGPA project but my FPGA doesn't have native support for TMDS outputs. The FPGA is a Spartan 3E and I believe it only has support for LVDS ...
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1answer
195 views

Can anyone identify if this is a standard connector or not?

Or let me know if there's a decision tree process to find out myself. It's from the LVDS connector on an apple motherboard. Foxconn part number m38&39, 01-01003047-00-b. I'm wondering if the ...