DDS2
9 Mar 2019 Revised by Kazuyuki Takeda 2 Mar 2019 Kazuyuki Takeda
This board serves for a direct digital synthesizer (DDS). Each rf channel of the Opencore NMR spectrometer is equipped with two separate DDS. The first DDS is implemented on the mother board. Here, we described the second one, which we call DDS2.
Board design
- The board was designed on EAGLE 6.2.0 Professional
- There are 4 layers. That is, in addition to the top and bottom layers, the board has two inner layers.
EAGLE schematic and board files
- Schematic: DDS2-03.sch
- Board: DDS2-03.brd
Gerber files
- DDS2-03.cmp (Component side pattern)
- DDS2-03.plc (Component side silkscreen)
- DDS2-03.sol (Solder side pattern)
- DDS2-03.stc (Component side solder resist)
- DDS2-03.sts (Solder side solder resist)
- DDS2-03.pls (Solder side silkscreen)
- DDS2-03.2l (2nd (inner) layer pattern)
- DDS2-03.3l (3rd (inner) layer pattern)
- DDS2-03.out (outline)
- DDS2-03.dri (drill list)
- DDS2-03.drd (drill data)
Note: The component side mean the top (1st) layer, while the solder side does the bottom layer.
Component side (1st layer)
2nd (inner) layer
3rd (inner) layer
Solder side (bottom layer)
Parts List
| Part | Value | Device | Package | Description |
|---|---|---|---|---|
| C1 | 1000p | C | 1005 | |
| C2 | 1000p | C | 1005 | |
| C3 | 0.1u | C | 1005 | |
| C4 | 6p | C | 1608 | |
| C5 | 12p | C | 1608 | |
| C6 | 12p | C | 1608 | |
| C7 | 33u | C | 3216 (polar) | tantalum |
| C8 | 0.01u | C | 1608 | |
| C9 | 0.1u | C | 1005 | |
| C10 | 0.1u | C | 1005 | |
| C11 | 0.1u | C | 1005 | |
| C12 | 0.01u | C | 1005 | |
| C13 | 0.01u | C | 1005 | |
| C14 | 0.01u | C | 1005 | |
| C15 | 0.01u | C | 1005 | |
| C16 | 0.01u | C | 1005 | |
| C17 | 0.01u | C | 1005 | |
| C18 | 0.01u | C | 1005 | |
| C19 | 0.01u | C | 1005 | |
| C20 | 0.01u | C | 1005 | |
| C21 | 0.01u | C | 1005 | |
| C22 | 0.01u | C | 1005 | |
| C23 | 0.1u | C | 1005 | |
| C24 | 0.01u | C | 1005 | |
| C25 | 33u | C | 3216 (polar) | tantalum |
| CN1 | U.FL-R-SMT | (HIROSE) | ||
| CN2 | FH12-30S-0.5SH | (HIROSE) 0.5mm pitch FPC connector | ||
| CN3 | U.FL-R-SMT | (HIROSE) | ||
| CN4 | U.FL-R-SMT | (HIROSE) | ||
| CN5 | DF13-2P-1.25V | (HIROSE) | ||
| FB1 | 30 Ohm @ 100 MHz | MPZ1608S300A | 1608 | Ferrite bead (TDK) |
| FB2 | 30 Ohm @ 100 MHz | MPZ1608S300A | 1608 | Ferrite bead (TDK) |
| FB3 | 30 Ohm @ 100 MHz | MPZ1608S300A | 1608 | Ferrite bead (TDK) |
| FB4 | 30 Ohm @ 100 MHz | MPZ1608S300A | 1608 | Ferrite bead (TDK) |
| U1 | AD9858 | (Analog Divices) DDS chip | ||
| L1 | 12nH | L | 1608 | |
| R1 | 2k | R | 1005 | |
| R2 | 27 | R | 1005 | |
| R3 | 27 | R | 1005 | |
| T1 | TC1-1-13M+ | (Mini Circuits) AT224 RF transformer | ||
| T2 | TC1-1T+ | (Mini Circuits) AT224 RF transformer | ||
| U2 | ADP-2-1W | (Mini Circuits) RF splitter |