ADS9850 Signal Generator Module
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- Stella Morris
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1 1. Introduction ADS9850 Signal Generator Module This module described here is based on ADS9850, a CMOS, 125MHz, and Complete DDS Synthesizer. The AD9850 is a highly integrated device that uses advanced DDS technology coupled with an internal high speed, high performance, D/A converter and comparator, to form a complete digitally programmable frequency synthesizer and clock generator function. All the external components which are needed are integrated on the board and the designer don t need to care more about the detailed design of ADS9850. The designer only needs to add the power and control signals to this module to driver this module
2 2. FEATURES and APPLICATIONS 2.1 FEATURES: Signal Frequency output range: 0-40MHz 4 Signal outputs: 2 sine wave outputs and 2 square wave outputs DAC SFDR > MHz AOUT 32-Bit Frequency Tuning Word Simplified Control Interface: Parallel Byte or Serial Loading Format Phase Modulation Capability +3.3 V or +5 V Single Supply Operation Low Power: MHz (+5 V) Low Power: MHz (+3.3 V) Power-Down Function 2.2 APPLICATIONS Frequency/Phase Agile Sine-Wave Synthesis Clock Recovery and Locking Circuitry for Digital Communications Digitally Controlled ADC Encode Generator Agile Local Oscillator Applications
3 3. The assembly drawing
4 4. Schematic
5 4. How to drive this module 1) Pin definition Symbol Type Function VCC P This is a voltage supply pin. 3.3V or 5V power input GND P This is a ground pin. W_CLK I Word Load Clock. This clock is used to load the parallel or serial frequency/phase/control words FQ_UD I Frequency Update. On the rising edge of this clock, the DDS will update to the frequency (or phase) loaded in the data input register, it then resets the pointer to Word 0 DATA I D7, Serial Load RESET I Reset. This is the master reset function; when set high it clears all registers (except the input register) and
6 the DAC output will go to Cosine 0 after additional clock cycles D0 D7 I 8-Bit Data Input. This is the 8-bit data port for iteratively loading the 32-bit frequency and 8-bit phase/ control word. D7 = MSB; D0 = LSB. D7 (Pin 25) also serves as the input pin for the 40-bit serial data word. Square Wave O This is the comparator s true output Ouput1 Square Wave O This is the comparator s complement output. Ouput1 Sine Wave O Analog Current Output of the DAC. Ouput1 Sine Wave Ouput1 O The Complementary Analog Output of the DAC. 2) DC Characteristics 1) Power supply: 3.3V or 5.0V 2) Interface voltage: 3.3V if power supply is 3.3V. 5.0V if power supply is 5.0V Characteristics Symb Min Typ Max Unit ol Logic 1 Voltage +5 V Supply V IH V Logic 1 Voltage +3.3 V Supply V IH V Logic 0 Voltage V IL V
7 3) Software description The AD9850 contains a 40-bit register that is used to program the 32-bit frequency control word, the 5-bit phase modulation word and the power-down function. This register can be loaded in a parallel or serial mode. In the parallel load mode, the register is loaded via an 8-bit bus; the full 40-bit word requires five iterations of the 8-bit word. The W_CLK and FQ_UD signals are used to address and load the registers. The rising edge of FQ_UD loads the (up to) 40-bit control data word into the device and resets the address pointer to the first register. Subsequent W_CLK rising edges load the 8-bit data on words [7:0] and move the pointer to the next register. After five loads, W_CLK edges are ignored until either a reset or an FQ_UD rising edge resets the address pointer to the first register. In serial load mode, subsequent rising edges of W_CLK shift the 1-bit data on Lead 25 (D7) through the 40 bits of programming information. After 40 bits are shifted through, an FQ_UD pulse is required to update the output frequency (or phase). For detailed information for Programming the AD9850, please download the following two documents on our website: (Search EIM377) 1. AD9850_specification.pdf (From Page 9) 2. AD9850_SW_samples.zip We also have demo board for this module for you. See the picture on the next page.
8 5. Pictures for working module
9 6. Test results 1MHZ 正 弦 波 输 出 图 : 1KHZ 正 弦 波 输 出 图 :
10 1MHZ 方 波 输 出 图 : 1KHZ 方 波 输 出 图 :
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