DS90C3202 for 2560x1440 resolution

Hi Kai,

We will need some more details to assess whether the DS90C3202 can support 2560 x 1440. 

From a rough estimate, we can say that 2560 * 1440 * 60 fps * 1.2 (approximation of blanking interval) = approximately 265 MHz. This means that, if you use dual pixel, the receiver must be able to tolerate a 133 MHz clock, which it can. 

However, there are a few more things we need to know about the system that incorporates more than just this timing estimate: 

- Is the frame rate going to be 60 Hz?

- What is the color depth (how many bits are you using)?

- What kind of interface/standard are you using for 2560 x 1440? Is dual pixel signaling acceptable?

- What is the exact amount of time used for horizontal and vertical blanking based on your design?

Thanks,

Michael

Dear Sir

- Is the frame rate going to be 60 Hz? => 60Hz

- What is the color depth (how many bits are you using)? => 24bit

- What kind of interface/standard are you using for 2560 x 1440? Is dual pixel signaling acceptable? => dual pixel input TTL (Even30bit ,Odd30bit)

- What is the exact amount of time used for horizontal and vertical blanking based on your design => Could you give me a example ? What value i can find in the datasheet 

Hi Kai,

I went back and double-checked the numbers from the timing spec you provided and was able to derive some values. 

Are you sure that the input is dual pixel? The timing spec for this panel display implies that quad pixel signaling is used, so I am not sure if it can accept dual pixel signaling from the DS90C3202. You can determine the exact timing for the blanking period by looking at the horizontal blank value and vertical blank value. Since the number of horizontal pixels = 2560 and only 640 pixels are shown in horizontal valid, we must multiply the horizontal valid and horizontal blank value in the spec by 4. Therefore, you can calculate clock frequency by:

4 x [Horizontal_Valid + Horizontal_Blank] x [Vertical_Valid + Vertical_Blank] x f_V = f_CLK

Thus, 4 x (640 + 40) x (1440 + 41) x 59.95 = 241.498 MHz, which is the pixel frequency (typ. 241.5 MHz in spec)

If we assume that this is a quad pixel input, then f_CLK = 241.498/4 = 60.374 MHz (typ. 60.38 MHz in spec)

The DS90C3202 can support dual pixel, up to 30bit color depth with a clock frequency ranging from 8 MHz - 135 MHz. This means that, if you are searching for a single IC that can meet the quad pixel specs of the panel you show, a single DS90C3202 cannot be used. You would need to have 2 x DS90C3202 to implement quad pixel. If you can use 2 x DS90C3202 to receive the quad data, then the color depth and acceptable clock frequency may be used with this panel.

Do you happen to have the part number for the panel display? Do you have a block diagram of how you plan to connect the DS90C3202 with the panel display? This may be helpful for us to confirm whether you can go with the approach of using 2 x DS90C3202.

Thanks,

Michael