Description
AD9854 DDS High Speed Module Programmable Clock Generator 1-400 MHz Square Wave Sine Waveform Generator
Product Description
The AD9854 digital frequency synthesizer is a highly integrated device that uses advanced DDS technology and built-in two high-speed, high-performance quadrature DACs to form a digitally programmable 1 and Q frequency synthesizer. Using a precision clock source as a reference, the AD9854 can produce highly stable frequency phase, amplitude programmable sine and cosine outputs, and can be used as an agile L0 in communications, radar and many other applications. The innovative high-speed DDS core provides 48-bit frequency resolution (with 300 MHz SYSCLK, the tuning resolution is 1 μHz) Maintaining 17 bits ensures that the device has excellent spurious-free dynamic range (SFDR).
Specification
item
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value
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Module model
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AD9854
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Module type
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digital synthesis frequency source
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Module power supply
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DC7-9V
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Module current
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650mA (MAX); quiescent current 90mA (TYP) normal drive current 620mA (TYP)
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Module communication protocol
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SPI parallel
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Module provides routines
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STM32F103RCT6
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Routine platform
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STM32F103X-M3 KEIL5 version source code
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Module system main frequency
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300MHz (MAX)
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DAC resolution digits
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12
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Phase accumulator digits
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48 bits
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Module output interface
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SMA; 24-hour salt spray anti-oxidation
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Module output signals
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sine wave, square wave; sine wave with 120MHz low-pass filter. Square wave coupling output.
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Module output channel
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5 channels; the phase difference between each pair is 90 degrees, the output of 1,4 channels has filters, and 2,3 channels have no filters. The square wave has a separate output.
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The signal characteristics of the module
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the sine wave square wave has no coupling output; the output has its own DC component. If it is connected to the radio frequency equipment, please add a DC blocker, or you can directly measure it with an oscilloscope. Square wave duty cycle adjustable range 5%-95%
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Highest main frequency output sine wave signal range
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1Hz-120MHz
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Max square frequency output square wave signal range
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1Hz-50MHz; oscilloscope input impedance above 50MHz requires 50 ohms
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Output amplitude
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sine wave 540mVpp (MAX) square wave 3.3Vpp; sine wave amplitude decreases with increasing frequency, square wave waveform changes with increasing frequency
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Output impedance
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50 ohms
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Module features
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multiple; support external FSK signal input, high-performance DDS sine wave signal generator, high-order elliptic filter, low-noise voltage regulator chip, etc.
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Module application
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multiple; frequency signal generation, sine wave, square wave signal generation, sensor excitation
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Module weight
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55g
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Module specifications
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85*65*12; length * width * height-PCB size
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Module interface type
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SMA signal output and external clock input, DC5.5 power socket, XH2.54-26PIN double-row pin data interface
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Installation Instructions
Precautions for module use
(1) The current consumption of the module is large, and the power supply needs to have a certain margin. It is recommended to use more than 7V1A for power supply. (2) Since the module is a high-precision device, in order to avoid unnecessary interference, it is recommended to use a linear power supply. (3) It is recommended to use the SMA to BNC cable for the output signal to observe the effect directly with the oscilloscope. Poor contact or inferior cable may cause signal attenuation or excessive noise. (4) Due to high power consumption and heat generation, pay attention to ventilation and heat dissipation during long-term work. (5) If you need to simply test the function of the module, it is recommended to use it with the control panel of our store. First, power the DDS module, and then power the control panel to generate a waveform. Long press the middle button to switch the function. (6) The delivered code is only for the supporting main control board, no MCU tutorial is provided, and additional functions need to be developed by yourself.
FAQ
Q: Can the main frequency and output amplitude of the module be adjusted? A: The main frequency of the module is determined by the input clock and the program. The module can input the clock externally. The onboard default clock is 20MHz, and the program control multiplier is 15 times. That is, the default main frequency is 300MHz. You can modify the input clock and The frequency multiplier changes the main frequency, and the output amplitude can be controlled by modifying the 12-bit amplitude register. You need to modify the program yourself. Q: Can the module realize frequency sweep? Can it generate AM and FSK signals? A: The module can realize frequency sweep, and the code provided by our shop can support frequency sweep. The module can generate simple AM signals, which need to be programmed by yourself. To generate FSK signals, you need to configure the registers, and then input high and low levels from the FSK port of the module to generate FSK signals. Q: Why is the waveform between channels not orthogonal after the frequency is increased? A: Due to the filter's tolerance and time delay effect, the frequency increase produces different phase shifts, so only when the frequency is lower, it is strictly orthogonal.
Details Images