ADI’s AD9914 is an integrated 12-bit DAC 3.5 GSPS direct digital synthesizer (DDS), using advanced DDS technology, and high-speed high-performance DAC together to form a digital programmable complete high-frequency synthesizer, can generate up to 1.4GHz analog Output sine wave, FM resolution 190 pHz, 16-bit phase modulation resolution, programmable analog-to-digital, automatic linear and nonlinear frequency sweep function, 32-bit parallel data path interface, phase noise −128 dBc/Hz, wideband SFDR less than- 50dBc, mainly used for LO frequency synthesis, programmable clock generators, FM FM pulses for radar and scanning systems, test and measurement equipment, polar modulators, fast frequency hopping and acousto-optic device drivers, etc. This article introduces the AD9914 Key features, block and functional block diagrams, and AD9914 evaluation board circuit diagram and bill of materials (BOM).
The AD9914 is a direct digital synthesizer (DDS) featuring a 12-bit DAC. The AD9914 uses advanced DDS technology, coupled with an internal high speed, high performance DAC to form a digitally programmable, complete high frequency synthesizer capable of generating a frequency- agile analog output sinusoidal waveform at up to 1.4 GHz. The AD9914 enables fast frequency hopping and fine tuning resolution (64-bit capable using programmable modulus mode). The AD9914 also offers fast phase and amplitude hopping capability. The frequency tuning and control words are loaded into the AD9914 via a serial or parallel I/O port. The AD9914 also supports a user defined linear sweep mode of operation for generating linear swept waveforms of frequency, phase, or amplitude. A high speed, 32-bit parallel data input port is included, enabling high data rates for polar modulation schemes and fast reprogramming of the phase, frequency, and amplitude tuning words.
The AD9914 is specified to operate over the extended industrial temperature range.
AD9914 main features:
3.5 GSPS internal clock speed
Integrated 12-bit DAC
Frequency tuning resolution to 190 pHz
16-bit phase tuning resolution
12-bit amplitude scaling
Automatic linear and nonlinear frequency sweeping capability
32-bit parallel datapath interface
8 frequency/phase offset profiles
Phase noise: −128 dBc/Hz (1 kHz offset at 1396 MHz)
Wideband SFDR < −50 dBc
Serial or parallel I/O control
1.8V/3.3V power supplies
Software and hardware controlled power-down
88-lead LFCSP package
PLL REF CLK multiplier
Phase modulation capability
Amplitude modulation capability
Agile LO frequency synthesis
Programmable clock generator
FM chirp source for radar and scanning systems
Test and measurement equipment
Acousto-optic device drivers
Fast frequency hopping
Figure 1. AD9914 Block Diagram
Figure 2. AD9914 functional block diagram
AD9914 Evaluation Board
This user guide describes how to set up and use the AD9914evaluation board. The AD9914 is a 3.5 GSPS DDS with a 12-bit DAC.
The evaluation board software provides a graphical user interface (GUI) for easy communication with the device along with many user-friendly features such as the mouse-over effect.
This user guide is intended for use in conjunction with the AD9914 data sheet.
Figure 3. AD9914 Evaluation Board Outline Drawing
Figure 4. AD9914 Evaluation Board Circuit Diagram (1)
Figure 5. AD9914 Evaluation Board Circuit Diagram (2)
Figure 6. AD9914 Evaluation Board Circuit Diagram (3)
AD9914 Evaluation Board Bill of Materials See:
AD9914 Evaluation Board Bill of Materials.xls
For details, see:
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