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PLEASE need some help on ths1206EVM . .

KIRAN KUMAR4
Prodigy 165 points
Other Parts Discussed in Thread: THS1206, MSP430G2553

Iam providing an analog input of 0.1 -0.2v to AINP and GND to obtain its digital form . .But  i am not able to obtain the outputs. I also have few doubts which are described below : .

Is the pin Avdd,Dvdd,Bvdd ,to be connected to power supply?What is  the ideal supply votage to be given ?

Where should i apply the reference voltage , i.e, at +ref & -ref or at refp & refm ?

What about the connections to the pin - 5VA ,5VD,3.3V,REFIN ? are those pins to be left open ?

And in the j1 the unused odd pins are to be grounded externally or are they grounded internally?

  • 0
    TI__Guru**** 180751 points

    Hi again Kiran,

    As I mentioned before, the THS1206 cannot accept an input voltage below REFM and REFM has to be at least 1.4V.  All power pins on the THS1206 must be connected to an appropriate supply.  AVdd has to be at least 4.75V and BVdd, DVdd can be tied to a 3.3V to 5.25V source.  The THS1206 has an internal reference, so its easiest to simply use that source, you do not need to connect an external reference to the EVM.  -5VA is not used.  The odd pins on J1 need to be referenced back to your controller, all ground connections on the EVM are reference together at JP1 by means of a zero ohm resistor (R8).

    If your intention is to use the THS1206MEVM with the MSP430G2553, your going to have to configure 12 pins on the MSP430 as GPIO's to accommodate the THS1206 parallel data bus.  You are also going to need to control CONV_CLK/CONVST and figure out a means to control the RD/WR functions required to operate the THS1206.  If you use the internal conversion clock, a GPIO or simple timer function can act as the convert start mechanism.  You can configure the /WR input as RD/WR, so your looking at connecting at least 14 pins between your launch pad and the THS1206 EVM.  Power and grounds are at least another 3 pins (5V, 3.3V and GND).  The THS1206 does not run 'on its own' - it has to be reset and configured for your desired operating mode, please review the configuration flow chart on page 17 of the data sheet.

  • 0 in reply to Tom Hendrick
    Prodigy 165 points

    Hi Tom Hendrick,

    Does THS1206EVM has an inbuilt clock ? Or is it to be provided externally ? Which pins are used for external provision ?

    And you stated that ("The odd pins on J1 need to be referenced back to your controller, all ground connections on the EVM are reference together at JP1 by means of a zero ohm resistor (R8).") are these connections to be wired externally ?

  • 0 in reply to KIRAN KUMAR4
    TI__Guru**** 180751 points

    Kiran,

    The EVM does not, but there is a BNC option on the board and a jumper that can allow you to supply an external conversion clock if you are running in continuous conversion mode.  If you use the internal conversion clock of the THS1206 in single conversion mode, you have to supply an external CONVST signal.  This detail is in the THS1206 data sheet on pages 16-18.

    All grounds on the board are wired together.  You must reference the ground of the EVM to the ground of your controller - any ground node will do, but this would be an 'external' connection with respect to the hardware.