TDC-GPX2 Standard Board
ams Eval Kit Manual
Page 6
[v1-00] 2016-Oct-20
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3 Hardware Description
3.1
Introduction
An on-board FPGA [1] manages the communication to the TDC-GPX [2]. It writes the configuration
into the chip via the SPI interface and can use the same to read data. In addition, the FPGA
manages the readout from the serial LVDS outputs of the TDC-GPX2. The SPI signals are available
via additional pads [3]. A jumper selects the supply voltage as 3.0 V, 3.3 V or 3.6 V [4]. A separate
jumper allows measuring the current into the TDC-GPX2 [5].
Figure 2: GPX2-EVA BOARD
Solder pads are prepared to apply an external oscillator. This may be used as a reference instead
of the RefClk input.
Further, solder pads are available to connect the signal lines. Here the user may solder cables
directly, apply pin connectors, or in case of CMOS signals pads for SMB connectors are prepared.
Note: The FPGA manages the SPI communication and blocks the lines. Therefore, it is not
possible to use the SPI for communication between an external device and TDC-GPX2.
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