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... | @@ -2,7 +2,8 @@ |
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## The connections
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## The connections
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![](/uploads/b5d0b0ef7de272f3f716ddae341ca6b2/adcBoard_expl.jpg)
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![](/uploads/b5d0b0ef7de272f3f716ddae341ca6b2/adcBoard_expl.jpg)
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*Figure 1 - Card features*
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<table>
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<table>
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<tbody>
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<tbody>
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... | @@ -56,7 +57,292 @@ ADC 100M](https://www.ohwr.org/project/fmc-adc-100m14b4cha-hw/wiki) |
... | @@ -56,7 +57,292 @@ ADC 100M](https://www.ohwr.org/project/fmc-adc-100m14b4cha-hw/wiki) |
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This board is designed to work with a 12 V DC at 3 A.
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This board is designed to work with a 12 V DC at 3 A.
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## Using the local oscillator
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By default, the board is mounted to be able to use an external
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oscillator (connector J13, 50 Ohm). To use the local oscillator, the
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ferrite bead L14 has to be mounted. The resistor R42 has to be removed
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and replaced by R33. The clock splitter LT6957 can also be used as a
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filter. Its cutting frequency can be set by the jumpers J15 and J16
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(table 1), by default (without the jumpers), the bandwidth is set to
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1200 MHz. The low position of the jumper is indicated by the 1 on the
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silkscreen. For example, if we want a bandwidth of 160 MHz, the jumper
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on J15 has to be placed linking the pin3 and the pin2 and J16 with the
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jumper linking the pin2 and pin1.
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<table>
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<tbody>
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<tr class="odd">
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<td><strong>J15</strong></td>
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<td><strong>J16</strong></td>
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<td><strong>Bandwidth</strong></td>
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</tr>
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<tr class="even">
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<td>LOW</td>
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<td>LOW</td>
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<td>1200 MHz (Full Bandwidth)</td>
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</tr>
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<tr class="odd">
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<td>LOW</td>
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<td>HIGH</td>
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<td>500 MHz (-3 dB)</td>
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</tr>
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<tr class="even">
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<td>HIGH</td>
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<td>LOW</td>
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<td>160 MHz (-3 dB)</td>
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</tr>
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<tr class="odd">
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<td>HIGH</td>
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<td>HIGH</td>
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<td>50 MHz (-3 dB)</td>
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</tr>
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</tbody>
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</table>
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*Table 1 - LT6957 bandwith according to the jumper position*
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## Changing the buck converter switching frequency
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It is possible to change the LM43603 switching frequency. On one hand,
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it is possible to change it by replacing the R19 resistor (Table 2). By
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default, this frequency is set to around 1 MHz by the use of a 39k
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resistor. The Table 2 is used as information, any resistor value in
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between two values of the table will give a switching frequency in
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between the corresponding frequencies. If no resistor is connected, the
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switching frequency is 500 kHz.
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On the other hand, it is possible to use an external oscillator to set
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this switching frequency. The clock signal is given on the J14 connector
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(50 Ohm). It is recommended to connect a resistor R19 such that the
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internal oscillator frequency is the same as the external one. More
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information on the LM43603
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[datasheet](http://www.ti.com/lit/ds/symlink/lm43603.pdf).
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<table>
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<tbody>
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<tr class="odd">
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<td><strong>Fs [kHz]</strong></td>
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<td><strong>R19 [kOhm]</strong></td>
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</tr>
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<tr class="even">
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<td>200</td>
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<td>200</td>
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</tr>
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<tr class="odd">
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<td>350</td>
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<td>115</td>
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</tr>
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<tr class="even">
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<td>500</td>
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<td>78.7</td>
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</tr>
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<tr class="odd">
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<td>750</td>
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<td>53.6</td>
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</tr>
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<tr class="even">
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<td>1000</td>
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<td>39.2</td>
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</tr>
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<tr class="odd">
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<td>1500</td>
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<td>26.1</td>
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</tr>
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<tr class="even">
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<td>2000</td>
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<td>19.6</td>
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</tr>
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<tr class="odd">
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<td>2200</td>
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<td>17.8</td>
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</tr>
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</tbody>
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</table>
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*Table 2 - LM43603 switching frequency according to the R19 resistor*
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## Board GPIO connectors
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Some GPIO pins are provided to be able to use the board for other
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purposes. While turning the card as on the above picture (Figure 1), the
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pin 1 for each connector is the one on the bottom left. Pin 2 is
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directly to its right etc. The pin 7 is placed above the pin1, next to
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it is the pin 8 etc. The table Table 3 shows the used GPIO.
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<table>
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<tbody>
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<tr class="odd">
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<td><strong>ADC board connection</strong></td>
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<td><strong>MicroHeader Connection</strong></td>
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<td><strong>Zynq AP SoC Connection</strong></td>
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</tr>
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<tr class="even">
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<td>P2 pin 1</td>
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<td>pin 73 Bank 35</td>
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<td>K14</td>
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</tr>
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<tr class="odd">
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<td>P2 pin 2</td>
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<td>pin 75 Bank 35</td>
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<td>J14</td>
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</tr>
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<tr class="even">
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<td>P2 pin 3</td>
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<td>pin 74 Bank 35</td>
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<td>H15</td>
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</tr>
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<tr class="odd">
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<td>P2 pin 4</td>
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<td>pin 76 Bank 35</td>
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<td>G15</td>
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</tr>
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<tr class="even">
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<td>P2 pin 7</td>
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<td>pin 81 Bank 35</td>
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<td>N15</td>
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</tr>
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<tr class="odd">
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<td>P2 pin 8</td>
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<td>pin 83 Bank 35</td>
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<td>N16</td>
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</tr>
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<tr class="even">
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<td>P2 pin 9</td>
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<td>pin 82 Bank 35</td>
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<td>L14</td>
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</tr>
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<tr class="odd">
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<td>P2 pin 10</td>
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<td>pin 84 Bank 35</td>
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<td>L15</td>
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</tr>
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<tr class="even">
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<td>P3 pin 1</td>
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<td>pin 62 Bank 35</td>
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<td>F19</td>
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</tr>
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<tr class="odd">
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<td>P3 pin 2</td>
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<td>pin 64 Bank 35</td>
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<td>F20</td>
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</tr>
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<tr class="even">
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<td>P3 pin 3</td>
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<td>pin 61 Bank 35</td>
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<td>G17</td>
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</tr>
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<tr class="odd">
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<td>P3 pin 4</td>
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<td>pin 63 Bank 35</td>
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<td>G18</td>
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</tr>
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<tr class="even">
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<td>P3 pin 7</td>
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<td>pin 53 Bank 35</td>
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<td>H16</td>
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</tr>
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<tr class="odd">
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<td>P3 pin 8</td>
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<td>pin 55 Bank 35</td>
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<td>H17</td>
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</tr>
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<tr class="even">
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<td>P3 pin 9</td>
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<td>pin 54 Bank 35</td>
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<td>J18</td>
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</tr>
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<tr class="odd">
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<td>P3 pin 10</td>
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<td>pin 56 Bank 35</td>
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<td>H18</td>
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</tr>
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<tr class="even">
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<td>P4 pin 1</td>
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<td>pin 36 Bank 35</td>
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<td>M19</td>
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</tr>
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<tr class="odd">
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<td>P4 pin 2</td>
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<td>pin 38 Bank 35</td>
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<td>M20</td>
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</tr>
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<tr class="even">
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<td>P4 pin 3</td>
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<td>pin 41 Bank 35</td>
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<td>M17</td>
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</tr>
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<tr class="odd">
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<td>P4 pin 4</td>
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<td>pin 43 Bank 35</td>
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<td>M18</td>
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</tr>
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<tr class="even">
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<td>P4 pin 7</td>
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<td>pin 35 Bank 35</td>
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<td>L19</td>
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</tr>
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<tr class="odd">
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<td>P4 pin 8</td>
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<td>pin 37 Bank 35</td>
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<td>L20</td>
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</tr>
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<tr class="even">
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<td>P4 pin 9</td>
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<td>pin 42 Bank 35</td>
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<td>K19</td>
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</tr>
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<tr class="odd">
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<td>P4 pin 10</td>
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<td>pin 44 Bank 35</td>
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<td>J19</td>
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</tr>
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<tr class="even">
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<td>P5 pin 1</td>
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<td>pin 23 Bank 35</td>
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<td>E17</td>
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</tr>
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<tr class="odd">
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<td>P5 pin 2</td>
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<td>pin 25 Bank 35</td>
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<td>D18</td>
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</tr>
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<tr class="even">
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<td>P5 pin 3</td>
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<td>pin 24 Bank 35</td>
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<td>D19</td>
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</tr>
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<tr class="odd">
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<td>P5 pin 4</td>
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<td>pin 26 Bank 35</td>
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<td>D20</td>
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</tr>
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<tr class="even">
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<td>P5 pin 7</td>
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<td>pin 29 Bank 35</td>
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<td>E18</td>
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</tr>
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<tr class="odd">
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<td>P5 pin 8</td>
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<td>pin 31 Bank 35</td>
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<td>E19</td>
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</tr>
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<tr class="even">
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<td>P5 pin 9</td>
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<td>pin 30 Bank 35</td>
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<td>F16</td>
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</tr>
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<tr class="odd">
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<td>P5 pin 10</td>
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<td>pin 32 Bank 35</td>
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<td>F17</td>
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</tr>
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</tbody>
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</table>
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*Table 3 - GPIO connections to the Zynq*
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-----
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-----
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18th of October 2016 - Nicolas Boucquey
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05th of December 2016 - Nicolas Boucquey
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