DDS AD9912 Arduino Shield Signal Generator up to Sine-wave output 600Mhz @1.3GSPS overclock, We provide FREE WORLDWIDE Economy shipping | ||||||||||||||||||||||||||||||||||||
DDS AD9912 Arduino Shield RF Signal Generator
DDS (Direct Digital Synthesis) Analog Devices AD9912 Arduino Shield by GRA & AFCH Opensource Software available on our GitHub repository: https://github.com/afch/DDS-AD9912-Arduino-Shield
Dear customers! If you have ANY questions, (PLEASE ASK us).
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Frequency: | 100 kHz – 400 MHz (600 MHz*) 1 Hz step |
Spurs max: | -70 dBc |
Frequency step: | 1 Hz |
Output power: | +4 dBm to -7 dBm (on 50 Ohm load) |
Output level up to: | 1 Vpeak-to-peak (at +4 dBm) |
Power Supply: | USB or External Power Supply 7.5V DC 1A |
Output filter (LPF): | 9th order (Cut 600 MHz) |
CMOS Output | up to 200 MHz, Level 1.8/3.3V |
HSTL Output | up to 750 MHz (1000 MHz*) |
Reference clock sources (optional): | XO-Crystal Oscillator, TCXO 1ppm, External Oscillator up to 1.3 GHz |
PCB Size: | 53.26 x 102 mm |
* when overclocking the core to 1.3 GHz
This parameter is very important and interesting for those who buy and want to use DDS Shield Board.
Since the internal phase noise of DDS is obviously less than that of PLL generators, the final value are highly dependent on the clock source.
In order to achieve the values stated in the datasheet on AD9912, when designing our DDS AD9912 Arduino Shield, we strictly adhered to all recommendations from Analog Devices:
PCB layout in 4 layers, 8 low noise voltage regulators for all power lines (3.3 V digital, 3.3 V analog, 1.8 V digital, and 1.8 V analog and etc.).
We measured the phase noise of our DDS AD9912 with the Anritsu MS2781B and found that the phase noise is below the instrument’s measurement capability
(shown as a red line on the graph).
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 of DDS9912 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 -133 dBc/Hz, while with the PLL system disengaged and using external clocking, the phase noise is -143 dBc/Hz.
This means that using an external clock signal results in a phase noise that is 10 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 -130 dBc/Hz, while with the PLL system disengaged and using external clocking, the phase noise is -146 dBc/Hz.
This means that using external clocking results in phase noise that is 16 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 simplest method to increase the power is 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.
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.
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 – 500000000)
H – Set HSTL Output: 0 – OFF, 1 – ON, 2 – Doubler ON
C – Set CMOS Output: 0 – OFF, 1 – ON
D – Set CMOS Divider (1 – 65353)
P – Set Output Power in dBm (-7 – +4)
M – Get Model
E – Enable Outputs (ALL)
S – Shut down Outputs (ALL)
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.
Speed – 115200 Bouds
Data Bits – 8
Stop Bits – 1
Parity – No
DTR – OFF
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
An example of setting up a serial port in the Ubuntu:
sudo usermod -aG dialout $USER_NAME$
sudo chmod a+rw /dev/ttyUSB0
sudo stty -F /dev/ttyUSB0 115200 cs8 ixoff -hupcl -echo
Usage example:
echo “F100000000” > /dev/ttyUSB0
example of command prompt with serial commands for AD9910 DDS RF Unit
Full Overview of AD9912 Shield Board available on our YouTube channel: "GRA & AFCH"
DDS AD9912 Shield Board Operating Instruction
DDS AD9912 Shield Board v1.x Operating Instruction (rev.B) with Connection Diagram [title]
DDS AD9912 Shield Board v1.x Operating Instruction (rev.B) with Connection Diagram [page 1]
DDS AD9912 Shield Board v1.x Operating Instruction (rev.B) with Connection Diagram [page 2]
DDS AD9912 Shield Board v1.x Operating Instruction (rev.B) with Connection Diagram [page 3]
DDS AD9912 Shield Board v1.x Operating Instruction (rev.B) with Connection Diagram [connection diagram]
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 Standard shipping
It takes about 35-45 days via Economy shipping
We combine multiple Items to save on shipping
Europe: | 3-5 days |
Germany: | 3-5 days |
USA, Canada: | 4-7 days |
Asia, South America: | 5-7 days |
Australia, New Zealand: | 5-7 days |
Africa, Central America: | 5-7 days |
Europe: | 10-12 days |
Germany: | 10-12 days |
USA, Canada: | 10-15 days |
Asia, South America: | 10-18 days |
Australia, New Zealand: | 12-18 days |
Africa, Central America: | 12-18 days |
Europe: | 25-30 days |
Germany: | 25-30 days |
USA, Canada: | 30-35 days |
Asia, South America: | 35-45 days |
Australia, New Zealand: | 45-55 days |
Africa, Central America: | 45-55 days |
All Returns are accepted