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DS90UB935-Q1: 3Mpixel clock rate

Hirokazu Takahashi
Expert 8420 points
Part Number: DS90UB935-Q1

Hello Support team,

We will use 3Mpxel image sensor.
The output foramt is below.
HMAX : 2050, VMAX:1750, YUV422 1pix:16bit, 30fps, MIPI CSI2 4lane, 430.5Mbps/lane
How can we calculate the clock frequency?
Can DS90UB935 and DS90UB953 support it?

Best Regards,
Hirokazu Takahashi

  • 0
    TI__Mastermind 28680 points

    Hi Hirokazu,

    The pixel clock (PCLK) is calculated using this equation: PCLK = (HMAX * VMAX) * Frame Rate = (2050 * 1750) * 30 = 107.625 MHz

    You can use the PCLK to calculate the CSI Bit Rate of your image sensor: CSI Bit Rate = PCLK * BPP (bits per pixel) = 107.625 MHz * 16 = 1722 Mbps

    By dividing the CSI Bit Rate by 4, then you can calculate the required bit rate of each lane in your MIPI CSI-2 4-Lane: 1722 Mbps / 4 Lanes = 430.5 Mbps/Lane

    The DS90UB935 is capable of up to 2.5 Gbps throughput (625 Mbps/Lane). The DS90UB953 is capable of up to 3.3 Gbps throughput (832 Mbps/Lane). Both Serializers are compatible with your 3 Megapixel image sensor.

    Best Regards,

    Justin Phan