Acquisition Module : First prototype inside:)

[Citizen]

Hi there:)


Remember   this thread over here?
https://www.eevblog.com/forum/projects/new-project-analog-acquisition-board/

Probably not

Here is the short summery:
 The Acquisition Module is an addon Module for any Dev- Board that need high speed ADC but  doesn't have any(like the most of them). Especially high speed FPGA boards sometimes need a high speed analog frontend for data acquisition. Like my Altera DE1 FPGA.
 So  i started to design my own acquisition module


Here are specs for this prototype:

3xADC08200 =200MSPS, 8bit ( will be overclocked to 250MSPS)

3xDAC5311 = one DAC for each ADC. It is generating the Vref-Top, the reference voltage for ADC. So if your signal has  max. Value of 1.5 V, you can set  the reference voltage  to use the whole 8 Bit resolution.

The main CLK-Source is Fox electronics 250  Mhz Oscillator. Its is very expensive! ( 80 € or so) But considering i got it  as sample...

The data Acquisition /Preprocessing and so on will be done by Altera CPLD MAXII. It also controls ADC/DAC , and generate CLK for ADC ( so you can choose from 250,125,62.5 and 31.25 Msps in order o spare some energy)
You also have 7  Blue LEds to play with:P

 The A-Module has ca. 48 GPIO so even if you assign all 3x8 bit channels , you will still have  24 GPIO for your special features;)
Speaking of features, you can always upgrade the CPLD-Firmware to fit your project via JTAG. My Current Firmware takes about 300 LE, so you still have 270 free LE to play with.(or you write your own from scratch:) )

 The current firmware allows the user to change the configuration like samplerate, Vref's, switch ADC on/off  via simple 2-Wire interface, it makes this module completely autonomous, so it can be used with any kind of  Dev. Boards, even with arduino;)
The PCB has 4 layers: Signal, GND, Vcc,Signal.

Now, i am glad to show  you  my first prototype  assembled last night.

It has some FAILS like  wrong footprint for voltage regulator ( not a big problem through) and i forgot 4 Vias for bypass caps....what a  noob. But  i could fix it with copper wire. Also my hand soldering it  not the first class, but considering this is my first project and first PCB-Design in my life, i still consider it as success:))

Now it is  running a simple  LED-Counter, the main Firmware is almost  done  and will be tested this weekend.

[benemorius]

Nice job.

Probably you can design out most or all of the tantalums. Most people avoid them unless there is absolutely no choice. Ceramics have come a long way.

[Jebnor]

Very Nice.

[PuterGeek]

Especially nice for a first effort! I've seen much worse from seasoned 'professionals'!