TDC7200EVM: Which one is better for LED(or laser) ToF sensing through air between TDC7200 and TDC7200EVM?

Minseong Park

Prodigy 180 points

Part Number: TDC7200EVM
Other Parts Discussed in Thread: TIDA-01187, TDC7200, , TIDA-00663

Hello,

I am trying to implement Lidar system with fabricated emitter(LED or laser) and receiver(photodiode).

Because I am not a circuit guy, PCB design is pretty challenging to me; therefore, TIDA-01187 is somewhat hard to me.

So, here are two choices

1. using TDC7200, self-soldering and connecting with Arduino and my fabricated receiver and emitter on a breadboard.

2. using TDC7200EVM, connecting to MSP430, and wiring the SMA connector with my fabricated receiver and emitter on a breadboard.

Which one is more desirable for my project? If any other options extist, please let me know as well. Thank you very much.

Best,

Ted

over 5 years ago

0 Bharat Aravamudhan over 5 years ago

TI__Genius 11015 points

Minseong,

Please refer the schematic in www.ti.com/.../TIDA-00663 for a reference on how to setup the schematic for a photodiode with the TDC7200 device.

0 Minseong Park over 5 years ago in reply to Bharat Aravamudhan

Prodigy 180 points

Dear Bharat,

Thank you for your reply. It seems that this reference design(TIDA-00663) is for fiber front-end design; is this still available for air-based transmission and receive? Additionally, can I use TIDA-00663 for only one detector? The 'START' signal can be come from fire signal(not from optical signal), and 'STOP' signal as same(from optical signal).

Best,
Minseong

0 Bharat Aravamudhan over 5 years ago in reply to Minseong Park

TI__Genius 11015 points

Minseong,

The photodiodes used will transmit & receive the signals through air. The START signal is received from the MCU & the STOP is generated/received from the optical end.

0 Minseong Park over 5 years ago in reply to Bharat Aravamudhan

Prodigy 180 points

Hello Bharat,

I appreciate you for the reply. This will be last question. For my fabricated receivers, Is it possible for TIDA-00663 to use only one TDC7200? That is, START signal from MCU and STOP signal from photodiode, and then it calculates ToF time = STOP - START. Sorry for the continuous asking.

Best,

Minseong

0 Bharat Aravamudhan over 5 years ago in reply to Minseong Park

TI__Genius 11015 points

Minseog,

Please note that the TDC7200 performs the function of a stopwatch and measures the elapsed time (time-of-flight or TOF) between a START pulse and up to five STOP pulses. For this device both the START & STOP are input pulses. In case your photodiode can generate the STOP pulse on its own without the need for any AFE and also if the Freq of both the START & STOP can be same then you could use just the TDC7200 device for ToF measurement.

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TDC7200EVM: Which one is better for LED(or laser) ToF sensing through air between TDC7200 and TDC7200EVM?