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TS3V340: Support Component(SOG) Signal or Not

Expert 2550 points

Replies: 6

Views: 395

Part Number: TS3V340

Hi E2E,

Could it support pure Component(SOG) Signal or not? (ex:720p or 1080p)

  • Julian,

    The TS3V340 device, like all Ti passive FET switches, will support any signal as long as the protocol is within the recommended operating conditions of 0-5.5 V and signal bandwidth is about 150 MHz or less. We recommend the switch bandwidth is about 3 times the signal bandwidth to have margin for system and PCB parasitic effects.

    What is the voltage range and bandwidth of your composite video signals?

    It looks like NTSC signals are 1 V p-p with a 0.714 V DC offset which is within the recommended operating conditions of 0-5.5v of the device.

    Also the bandwidth will depend on how many factors such as the screen resolution, screen refresh rate, etc. 


     
    Thank you,
    Adam

  • In reply to Adam Torma:

    Hi Adam,

    Thanks for your reply.

    I have another  question as below.

    1.   As I know,  "Composite Video Switching" need to support negative sync  level which about -300mV.
    But IC recommand just only 0V, is it OK for this condition?

    2. VCC recommand is 3.6V. If I use 5V input, Does IC have any issue?

  • In reply to Julian Chen:

    Julian,

    1) TI cannot guarantee the datasheet performance in the electrical specifications table if the device is operated outside the recommended operating conditions.  It could be possible to add a DC bias if you are concerned about the device receiving a negative voltage.

    2)  The recommended I/O voltage for this device is 0 to 5.5V.  This spec is not referenced to Vcc.

    Thank you,

    Adam

  • In reply to Adam Torma:

    Hi Adam,

    Datasheet show can support Composite Video switch which  voltage as low as -300mV.
    It confuse me about the datasheet.

  • In reply to Julian Chen:

    Hi Adam,

    Could you clear up confusion?

    Thanks a lot!

  • In reply to Julian Chen:

    Julian,

    This device was designed for video applications back in 2004 and many customers have successfully used this device over the years.

    You can see in the abs max spec there is a note 2 that states I/O voltage ratings may be exceeded if the current clamp ratings are observed.  There are protection circuits that act like diodes on the I/O pins.  If the I/O voltage becomes increasingly negative the protection circuit will become forward biased and begin to sink current clamping the voltage on the pin.  Based on this spec you can see that this will happen around -0.5 V. 

    Thank you,

    Adam   

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