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Original question:

TINA/Spice/OPA549-HIREL: Composite amplifier for OPA549-HiRel using OPA192 with improved DC accuracy and drift

TDC1000-C2000EVM: TDC1000-C2000EVM

SUNIL MEENA
Prodigy 20 points
Part Number: TDC1000-C2000EVM
Other Parts Discussed in Thread: TDC1000, OPA549

I just want to check start and stop pulses without using any sensor but i am not getting as given in the data sheet , my CRO shows AC pulse instant of square pulse, it shows like sine wave with 50Hz frequency.

my resister setting is given below.

Address    Values

0x00:        0x42

0x01:      0x41

0x02:      0x00

0x03:      0x04

0x04:      0x5F

0x05:      0x03

0x06:     0xFF

0x07:     0x00

0x08:     0x23

0x09:     0x00

  • 0
    TI__Genius 11015 points
    Hello Sunil,

    The EVM will need a transducer for it to transmit and receive signal. Please hook up any transducer and then check the plots.
  • 0 in reply to Bharat Aravamudhan
    Prodigy 20 points

    Ya but for start and stop pulses are generated by TDC1000 this is output pin for that also need transducer?.

    I also check with using 10mm 40kHz Piezo Ultrasonic Transmitter / Receiver Sensor, still it showing only sin waves.

    How to varies the transducer transmitter frequency?

    According to data sheet it can varies with input clock frequency. But crystal oscillator internally produces 8Mhz how I can control that clock frequency without using external clock.

  • 0 in reply to SUNIL MEENA
    TI__Genius 11015 points
    Sunil,

    Please let me know your application, you seems to continue or refer a different thread which points to OPA549 device.

    The START & STOP Pulses are the output of the TDC1000 device and these are generated based on the input that the device receives from the transducer attached to it. Kindly read the TDC1000 datasheet for a basic understanding of the device.

    www.ti.com/.../tdc1000-q1.pdf

    Do you find sine waves at the START & STOP Pulses ? The START and STOP pulses should be square pulses.

    Yes, the Tx & Rx signals will be a sine wave only.

    Please note that the transducer transmitting frequency will depend on the transducer you plan to use. For example when you use 40kHz Piezo, the resonant frequency of the transducer is 40Khz, now we need to sync the internal clock of the device with this resonant frequency. So you select the on board Osc (which is 8Mhz) and then divide this clock Tx_Clock_Div with 256 to get 31Khz which is close to the resonant frequency of the transducer. Incase you use a 1Mhz Piezo then the Tx_Clock_Div will be 8 to get 1Mhz.