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DDS AD9910 Shield for Arduino RF Signal Generator
DDS (Direct Digital Synthesis) Analog Devices AD9910 Shield for Arduino This device is designed to ensure seamless integration with Arduino MEGA 2560 It does not require any extra wires or converters to work properly For maximum performance we recommend Ultra-low noise reference oscillator RCLN1000 All functions of the DDS AD9910 are brought to the contacts from the Arduino MEGA With this you can fully reveal all the capabilities of the DDS AD9910 Shield PCB Design Schematics Case and Software made by GRA & AFCH
DDS AD9910 RF Unit support control from PC via Serial Port Commands
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Key features:
Low harmonics no more than -60dBc. An output RF transformer is used for the correct operation of the current mirror
Small spurs
4 layer board. Signal lines TOP and Bottom, inner layers Ground and Power
Low Noise LDO Stabilizers
Separate power supply for all analog and digital lines (1.8V and 3.3V), 5 pcs IC voltage stabilizers are used. Additionally, there is an RF Ferrite bead interchange
High-speed decoupling Level converter and TTL 5V matching
Types of reference oscillators (optional, choose in selectors):
XO – Crystal 25.000 MHz 20 ppm internal oscillator with PLL at 1 GHz
TCXO – 40.000/50.000MHz MHz 1 ppm internal oscillator with PLL at 1 GHz
OCXO – Oven Controlled Crystal Oscillators deliver the ultimate piezo electric performance with stabilities down to less than ±1 ppm
EGEN – External Generator up to 1.5 GHz (to connect an external clock source of up to 1.5 GHz, NOT INCLUDED)
Additionally balancing transformer is used for TCXO/OCXO and EGEN options
Additionally balancing transformer is used for TCXO, EGEN and OCXO options:
Easy to connect OLED display
Control buttons for control via the program menu
The synthesizer is capable to generate sine wave, AM or FM modulated signal
The software allows you to select and configure the frequency of the clock generator through the user menu (without the need to recompile the program)
Any settings can be stored in non-volatile EEPROM memory (located at Arduino Mega)
Basic settings are applied and saved automatically
This shield support overclocking the AD9910 core to 1.5 GHz (heatsink is recommended)
DDS AD9910 Shield has ability to generate a signal up to 600 MHz with a core overclocking up to 1.5 GHz (to suppress harmonics, it is recommended to overclock the AD9910 for frequencies above 400 MHz)
Has ability to increase output power by +4 dBm when “DAC Current HI” is activated
Detailed description:
Easy to connect OLED display
Control buttons for control via the program menu
The firmware allows you to select and configure the frequency of the clock generator through the user menu (without the need to recompile the program)
Any settings can be stored in non-volatile EEPROM memory (located at Arduino Mega)
Basic settings are applied and saved automatically
Expanded and convenient DDS clock source menu
Offset parameter allows adjusting the clock frequency if the deviation from the specified value
This shield support overclocking the AD9910 core to 1.5 GHz (heatsink is recommended)
DDS AD9910 Shield has ability to generate a signal up to 600 MHz with a core overclocking up to 1.5 GHz (to suppress harmonics it is recommended to overclock the AD9910 for frequencies above 400 MHz)
It is possible to obtain a low frequency at the DDS output from 10 Hz (modification required, see instructions below)
Has ability to increase output power by +4 dBm when “DAC Current HI” is activated
Functional features:
Support of OLED display (selectable in options)
Buttons for navigating and controlling settings through the program menu
DDS Shield is capable to generate Sine Wave, AM/FM modulated signal and SWEEP
Firmware allows selecting and configuring frequency of the clock generator through the user menu (without the need to recompile and upload the program)
All settings can be stored in non-volatile EEPROM memory (located in Arduino Mega 2560 Board)
Basic settings are applied and saved automatically
Expanded and convenient DDS Clock source menu
Offset parameter allows adjusting the core clock frequency if the deviation from the specified value is known
Shield supports overclocking the AD9910 core up to 1.5 GHz (heatsink is recommended in this case)
DDS AD9910 Shield has the ability to generate signal up to 600 MHz with a core overclocking up to 1.5 GHz (to suppress harmonics it is recommended to overclock the AD9910 for frequencies above 400 MHz)
It is possible to obtain a low frequency at the DDS output from 10 Hz (modification required, see instructions below)
Activating ‘DAC Current HI’ increases the output power capability by +4 dBm
Electrical performance:
Ensured low harmonic level with levels not exceeding -60dBc, this is due to the use of an output RF transformer for optimal current mirror operation
Low Noise LDO Stabilizers with separate power supply for all analog and digital lines (1.8V and 3.3V), they utilizes 5 IC voltage stabilizers; additionally there is an RF Ferrite bead interchange
4 layered PCB with signal lines on Top and Bottom and inner layers Ground and Power
High-speed decoupling Level converter and TTL 5V matching
Remote control of the DDS Generator through a USB connection and PC using the terminal serial port
Specifications:
Frequency:
100 kHz – 420 MHz (600 MHz*)
Spurs max:
-60 dBc
Frequency step:
1 Hz
Output power:
+0 dBm (+4**) to -84 dBm (on 50 Ohm load)
Output level up to:
1 V peak-to-peak (at +4 dBm)
Phase noise:
-135 dBc/Hz @ 1 KHz offset (400 MHz Carrier)
Output filter:
LPF LC 7th Order 600 MHz cut-off (-3 dB)
Modulation frequency for AM (Amplitude modulation):
10 Hz to 100 kHz in 1 Hz step
AM modulation depth:
0% to 100% in 1% increments
Modulation frequency for FM (Frequency modulation):
10 Hz to 100 kHz in 1 Hz step
FM modulation deviation frequency:
0 Hz to 100 kHz in 1 Hz step
Reference clock sources (on choice):
XO-Crystal Oscillator, TCXO 1ppm, OCXO 0.1ppm, Crystek, or External Oscillator up to 1.5 Ghz
Power requirements:
USB or External Power Supply 7.5V DC 1A
Shield Board size:
53 x 102 х 32 mm
* When overclocking the core to 1.5 GHz ** When the “DAC Current HI” function is activated
Dear customers! If you have ANY questions, PLEASE ASK us
Phase Noise:
This parameter is very important and interesting for those who wants to buy DDS. Since the intrinsic phase noise of DDS is obviously less than that of PLL generators, the final value is highly dependent on the clock source. Designing our DDS AD9910 Shield for Arduino we strictly adhered to all recommendations from Analog Devices. This was done In order to achieve the values stated in the datasheet for the AD9910. Among these are PCB layout in 4 layers, separate power supply of all 4 power lines (3.3 V digital, 3.3 V analog, 1.8 V digital, and 1.8 V analog).
Figure below shows the phase noise level when using the built-in PLL in DDS. The PLL multiplies the frequency of the on-board 50 MHz TCXO generator by a factor of 20. The output frequency is 100 MHz.
Figure below shows the phase noise level when using an external reference clock frequency of 1 GHz (RCLN1000), with the PLL OFF. The output frequency of the DDS is 100 MHz.
Let’s compare these two graphs, for example, at a 10 kHz offset from the carrier: with the internal PLL system engaged, the phase noise level is -129 dBc/Hz, while with the PLL system disengaged and using external clocking, the phase noise is -140 dBc/Hz. This means that using an external clock signal results in a phase noise that is 11 dBc/Hz better (lower).
For the same output frequency, but at a 1 MHz offset from the carrier, with the internal PLL system engaged, the phase noise level is -124 dBc/Hz, while with the PLL system disengaged and using external clocking, the phase noise is -152 dBc/Hz. This means that using external clocking results in phase noise that is 23 dBc/Hz better (lower).
Conclusion: When using external clock, you can get much lower phase noise than using the built-in PLL. But do not forget that in order to achieve such results, increased requirements are put forward to the external oscillator. For maximum performance we recommend our Ultra-low noise reference oscillator 1GHz RCLN1000.
We recommend to use Ultra Low Noise Reference Oscillator with our DDS Shield Boards:
The first and simplest method to increase the power from the nominal 0 dBm to +4 dBm is by activating the “Hi-Current” option in the menu (refer to Operation instruction).
NOTE: enabling this setting leads to increase in harmonic levels of the output signal.
If this level of power is still insufficient, there is a second method – connecting an external RF signal Amplifier, such as the MMIC MRFA89. It allows obtaining a DDS signal output power of up to +20 dBm.
IMPORTANT: Since the MMIC MRFA89 Amplifier has maximum output power of +20 dBm and gain of 20 dB, the recommended maximum input signal level is 0 dBm. Therefore, the ‘Hi-Current’ parameter should be deactivated in the AD9910 Shield menu.
NOTE: as most amplifiers generate harmonics, it is advised to connect an LPF Filter to the Amplifier output for harmonic suppression. For example, one from the LPF 7th Order Elliptical series that we offer.
We recommend to use RF Amplifier and Low Pass Filter with our DDS Shield Boards:
RF Amplifier LNA 8-2000 MHz, GAIN = 20 dB, P = +20 dBm + LDO MMIC MRFA89 SOT-89 https://www.ebay.com/itm/184629327037
Remote control of DDS Generator through USB connection from PC using the terminal serial port:
List of Serial Port Commands:
Starting with version 1.02, the ability to control via the serial port has been added.
F – Set Frequency in Hz (100000 – 600000000) P – Set Output Power in dBm (-72 — 0 OR -68 — +4, depending on “DAC current”) E – Enable Output D – Disable Output M – Get Model V – Get Firmware Version h – Help ; – Commands Separator
Example: F100000;P-2 Set Frequency to 100 kHz, and Output Power to -2 dBm. Any number of commands in any order is allowed.
Serial Port Settings:
Speed – 115200 Bouds Data Bits – 8 Stop Bits – 1 Parity – No DTR – OFF
Windows:
An example of setting up a serial port in the Windows console:
mode COM3 baud=115200 DTR=OFF Data=8
Usage example:
echo F100000000 > COM3
Ubuntu 22.04:
An example of setting up a serial port in the Ubuntu:
Dear customers! If you have ANY questions, PLEASE ASK us
Shipping and Return information
All Items are shipped from Ukraine Via International registered Airmail Shipments are made within 1 business day After the payments are received and verified It takes about 4-7 days via UPS Express delivery It takes about 10-18 days via Standerd shipping It takes about 35-45 days via Economy shipping We combine multiple Items to save on shipping
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Standard Shipping time:
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10-12 days
Germany:
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Asia, South America:
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Australia, New Zeland:
12-18 days
Africa, Central America:
12-18 days
Economy Shipping time:
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Germany:
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Africa, Central America:
45-55 days
Return Policy
All Returns are accepted
For Return you should contact Us within 14 Days after receiving the Item
Refunds are made as Money back or Replacements (buyer’s choice)
Return Shaipments are paid by the buyer
No restocking fees are charged
Dear customers! If you have ANY questions, PLEASE ASK us