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DDSFunctionGenerator
RobertGawron/DDSFunctionGenerator6A 6 MHz Direct Digital Synthesis (DDS) function generator, fully configurable via SCPI (Standard Commands for Programmable Instruments) protocol. Designed for precision waveform generation with flexible control through standardized commands.
- Size
- 80 × 65 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 156
- Nets
- 86
- Pads
- 461
- Tracks, vias
- 749, 102
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 19 Oct 2019
- Updated
- 7 Feb 2026
Overview
DDSFunctionGenerator is an open-source printed circuit board by RobertGawron, from the RobertGawron/DDSFunctionGenerator repository on GitHub, published under the MIT licence. It is a 2-layer board of 80 × 65 mm with 156 parts on 86 nets, routed with 749 tracks and 102 vias.
It is built around the AD8325ARU, FT200XD-R and TC1107-3.3VOA, with the DG128-5.0-02P-14-00A(H) among its other parts. Its parts include 66 capacitors, 39 resistors, 9 connectors, 8 ICs and 8 diodes. It belongs with the STM32 boards of this library.
Main components
4
AD8325ARU
TSSOP-28-40℃~+85℃ 133mA 4.75V~5.25V Differential VGA TSSOP-28 Programmable / Variable Gain Amplifiers (PGA/VGA) ROHSAnalog DevicesInterface - Specialized
FT200XD-R
DFN-10-EP(3x3)-40℃~+85℃ 125uA 5V 8mA USB 2.0 USB to I2C DFN-10-EP(3x3) USB Converters ROHSFTDIUSB Converters
TC1107-3.3VOA
SOIC-8-40℃~+125℃@(Tj) 1 3.3V 300mA 480mV@(300mA) 50uA 60dB@(1kHz) 6V Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOIC-8 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMicrochip TechnologyVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
DG128-5.0-02P-14-00A(H)
插件,P=5mm-40℃~+105℃ 1 12~30 1x2P 2 2.5 20A 2P 300V 5mm Green Through Hole 插件,P=5mm Screw Terminal Blocks ROHSDEGSONScrew Terminal Blocks
README
README.md6MHz DDS Function Generator
This project is unfinished.
Summary
A function generator is a laboratory instrument used to generate various electrical waveforms. This project utilizes DDS DDS (direct digital synthesis), a technique that allows the creation of arbitrary waveforms from a single base frequency.
Current Version
The current version of the PCB uses components with 0402 (or similar) footprints. Use of these components wasn’t the best choice - they're too difficult to solder, and there was no need to minimize the board size. The next version of the PCB will switch to 0805 components for easier assembly.
System Architecture
Tools: PlantUML
Hardware
Tools: KiCad (for PCB design).
Software
Tools:
- Business Logic: Written in Forth, a stack-based programming language designed for embedded systems and control applications.
- Drivers: Developed in C++17.
- Hardware Abstraction Layer (HAL): Auto-generated using CubeMX, a tool from STMicroelectronics.
Simulation
This project includes an LCD for user interaction. To simplify the creation of the layout, a simulation environment has been developed.
This simulation combines the following:
- UI: Built using PyQt for rendering the LCD layout and facilitating user interaction.
- Business Logic: Reuses the core firmware logic directly from the hardware codebase.
- HAL and Driver Mocks: Created in C++.
Enclosure
The device's enclosure is designed using OpenSCAD, a script-based 3D CAD modeler that allows precise and parametric design.
Devops
Repetitive setup tasks are best left to automation, which is why the development environment is managed with Docker. This approach eliminates the need to deal with outdated installation lists or READMEs—just run the container, and everything is ready to go.
Parts
156| Qty | Value | Footprint | References |
|---|---|---|---|
| 35 | 100n | Capacitor_SMD:C_0402_1005Metric | C3, C19, C20, C26, C27, C28, C29, C30, C31, C32, C33, C34, C35, C36, C38, C41 +19 |
| 9 | 10k | Resistor_SMD:R_0402_1005Metric | R2, R5, R13, R14, R21, R28, R29, R35, R39 |
| 7 | 53R6 | Resistor_SMD:R_0402_1005Metric | R3, R7, R10, R15, R18, R23, R26 |
| 7 | D | Diode_SMD:D_MiniMELF | D1, D2, D3, D5, D6, D7, D8 |
| 5 | 2k2 | Resistor_SMD:R_0402_1005Metric | R4, R12, R20, R32, R33 |
| 4 | 10n | Capacitor_SMD:C_0402_1005Metric | C17, C18, C39, C48 |
| 4 | 10u | Inductor_SMD:L_0805_2012Metric | L2, L3, L7, L9 |
| 4 | 1n | Capacitor_SMD:C_0402_1005Metric | C21, C22, C23, C40 |
| 3 | 100R | Resistor_SMD:R_0402_1005Metric | R6, R8, R42 |
| 3 | 1k | Resistor_SMD:R_0402_1005Metric | R9, R17, R25 |
| 3 | 49R9 | Resistor_SMD:R_0402_1005Metric | R1, R30, R37 |
| 3 | Q_NPN_BEC | Package_TO_SOT_SMD:SOT-323_SC-70 | Q1, Q2, Q3 |
| 3 | RSM850B-6112-85-1005 | Relay_THT:Relay_DPDT_Omron_G6K-2P-Y | Rel1, Rel2, Rel3 |
| 3 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2, JP3 |
| 3 | TestPoint | TestPoint:TestPoint_Pad_1.0x1.0mm | TP1, TP4, TP6 |
| 2 | 0R | Resistor_SMD:R_0402_1005Metric | R34, R36 |
| 2 | 15p | Capacitor_SMD:C_0402_1005Metric | C47, C56 |
| 2 | 1u | Inductor_SMD:L_0805_2012Metric | L1, L4 |
| 2 | 1u | Capacitor_SMD:C_0402_1005Metric | C1, C7 |
| 2 | 220R | Resistor_SMD:R_0402_1005Metric | R16, R19 |
| 2 | 220u | Capacitor_SMD:CP_Elec_6.3x5.8 | C62, C65 |
| 2 | 27R | Resistor_SMD:R_0402_1005Metric | R40, R41 |
| 2 | 47p | Capacitor_SMD:C_0402_1005Metric | C9, C42 |
| 2 | 47u/10V | Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B | C2, C45 |
| 2 | 47u/6V3 | Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B | C37, C49 |
| 2 | 8p2 | Capacitor_SMD:C_0402_1005Metric | C24, C25 |
| 2 | Conn_01x04_Female | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J8, J9 |
| 2 | Conn_Coaxial | Connector_Coaxial:U.FL_Molex_MCRF_73412-0110_Vertical | J5, J6 |
| 1 | 100n | Inductor_SMD:L_0805_2012Metric | L6 |
| 1 | 120R | Resistor_SMD:R_0402_1005Metric | R31 |
| 1 | 1u8 | Inductor_SMD:L_0805_2012Metric | L5 |
| 1 | 20MHz | Oscillator:Oscillator_SMD_EuroQuartz_XO53-4Pin_5.0x3.2mm | Y1 |
| 1 | 25R5 | Resistor_SMD:R_0402_1005Metric | R44 |
| 1 | 330p | Capacitor_SMD:C_0603_1608Metric | C15 |
| 1 | 390p | Capacitor_SMD:C_0603_1608Metric | C57 |
| 1 | 430p | Capacitor_SMD:C_0603_1608Metric | C13 |
| 1 | 470p | Capacitor_SMD:C_0603_1608Metric | C16 |
| 1 | 470p | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | 4k7 | Resistor_SMD:R_0402_1005Metric | R38 |
| 1 | 560p | Capacitor_SMD:C_0603_1608Metric | C10 |
| 1 | 680p | Capacitor_SMD:C_0603_1608Metric | C14 |
| 1 | 750p | Capacitor_SMD:C_0603_1608Metric | C11 |
| 1 | 91p | Capacitor_SMD:C_0603_1608Metric | C12 |
| 1 | AD8325 | Package_SO:TSSOP-28_4.4x9.7mm_P0.65mm | U7 |
| 1 | AD9832 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U4 |
| 1 | Conn_01x02_Female | DDSFunctionGenerator:DG128-5.0-02P-14-00A | J4 |
| 1 | Conn_01x04_Male | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J7 |
| 1 | Conn_Coaxial | Connector_Coaxial:BNC_Amphenol_B6252HB-NPP3G-50_Horizontal | J1 |
| 1 | DG128-5.0-02P-14-00A | DDSFunctionGenerator:DG128-5.0-02P-14-00A | J3 |
| 1 | EN11-VSB1AQ15 | DDSFunctionGenerator:EN11-VNB1BQ15 | SW1 |
| 1 | FT200XD | Package_DFN_QFN:DFN-10-1EP_3x3mm_P0.5mm_EP1.55x2.48mm | U6 |
| 1 | Jumper_NC_Small | Jumper:SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP4 |
| 1 | L78L08_SOT89 | Package_TO_SOT_SMD:SOT-89-3 | U2 |
| 1 | L78L33_SO8 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U3 |
| 1 | LED | LED_SMD:LED_0402_1005Metric | D4 |
| 1 | MCP3425A0T-ECH | Package_TO_SOT_SMD:SOT-23-6_Handsoldering | U8 |
| 1 | MountingHole_Pad | MountingHole:MountingHole_2.5mm_Pad | H1 |
| 1 | STM32F030K6Tx | Package_QFP:LQFP-32_7x7mm_P0.8mm | U5 |
| 1 | TC1107-3.3VOA | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | Transformer_1P_1S | DDSFunctionGenerator:Transformer_B62152_8.3 | T1 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Molex_47346-0001 | J2 |
| 1 | XO91 | DDSFunctionGenerator:LF_SPXO018035 | X1 |
Questions
How big is the DDSFunctionGenerator PCB?
It measures 80 × 65 mm and has 2 copper layers, 1.6 mm thick.
What parts does the DDSFunctionGenerator use?
156 parts, built around the AD8325ARU, FT200XD-R, TC1107-3.3VOA and DG128-5.0-02P-14-00A(H). The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the DDSFunctionGenerator KiCad files?
From the RobertGawron/DDSFunctionGenerator repository on GitHub, at the commit this page was made from: the board is Hardware/DDSFunctionGenerator/DDSFunctionGenerator.kicad_pcb and its schematic Hardware/DDSFunctionGenerator/ADC.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the DDSFunctionGenerator design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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