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IN S T R U M E N T S
INSTRUCTION MANUAL
Model DDS9m 170MHz 4-Channel Signal Generator Module
DDS9m
Table of Contents
Section
Page
Contents
1.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . . . . . . . . . . . . . . . . . . . . . . Description
2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . . . . . . . . . . . . . . . . . . . . Specifications
3.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . . . . . . . . . . . . . . Hardware Installation
4.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 . . . . . . . . . . . . . . . . . . . . . . . . . . .Operation
5.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 . . . . . . . . . . . . . . . . . . Theory of Operation
6.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 . . . . . . . . . . . . . . . . . . . . .Performance Test
7.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 . . . . . . . . . . . . . . . . . . . . . . . . . .Calibration
--. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 . . . . . . . . . . . . . . . . . . . . . . . . . . . Warranty
NOVATECH INSTRUMENTS
1
DDS9m Manual
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Summary of Contents for Novatech DDS9m
- Page 1 IN S T R U M E N T S INSTRUCTION MANUAL Model DDS9m 170MHz 4-Channel Signal Generator Module DDS9m Table of Contents Section Page Contents 1.0 ......2 ......Description 2.0 .
- Page 2 <-55dBc below 20MHz greater than 1MHz and less 125MHz). <-45dBc below 80MHz <-35dBc below 160MHz 1.2 The DDS9m can also be used with an External (channel-channel isolation: <-60dBc) Clock input. An on-board programmable frequency multiplier generates the master clock allowing user 2.7 TABLE MODE...
- Page 3 NOTE: that the data TO the DDS9m is on pin 3; the data FROM the DDS9m is on pin 2 and the COMMON The program SOF8 is available for the DDS9m.
- Page 4 Select clock source. x=E for External clock, x=I for Internal Clock. May require adjustment of Kp and external filtering of output when an external clock is used. Reset. This command resets the DDS9m. EEPROM data is preserved and, if valid, is used upon restart. This is the same as cycling power.
- Page 5 5.08, 3.81 0.20, 0.15 78.7, 3.81 3.10, 0.15 78.7, 85.1 3.10, 3.35 22.9, 85.1 0.90, 3.35 5.08, 85.1 0.20, 3.35 Lower Left Corner of board (as shown by 0,0) is origin of X,Y coordinates for hole location. NOVATECH INSTRUMENTS DDS9m Manual...
- Page 6 DDS9m. If your system is 5V, it is suggested that VHC buffers powered by 3.3V be placed between the DDS9m and your system. You may use the 3.3 V on pin 2 of P4 for this power (up to 50mA).
- Page 7 Note that no flow control is provided. Depend- vided on MCX connectors (Johnson Components, ing upon your host, the DDS9m may not be able to 133-3701-133 or equivalent) on the board edge. keep up with serial characters. The DDS9m will Simply connect your 50Ω...
- Page 8 RAM, so they will not show in the “QUE” command output nor can they be saved in EEPROM. Consult 4.10 The command then sent to the DDS9m for the the Analog Devices AD9959 data sheet for detailed 1.544MHz output, with a 10MHz external clock,...
- Page 9 CLK SEL System Control Voltage µC RS232 Control DDS9m Module Figure 3. Simplified System Block Diagram “Que” command output (all values are hexadecimal) values: 05F5E100 0000 0000 03FF 00000000 00000000 000301 05F5E100 0000 0000 03FF 00000000 00000000 000301 05F5E100 0000 0000 03FF 00000000 00000000 000301...
- Page 10 In the “I m” mode, an 5.2 At every cycle of the DDS9m master clock, the update pulse will not be sent to the DDS chip until 32-bit DDS integrated circuit increments the phase an “I p”...
- Page 11 Therefore, the NOTE: output is limited to approximately 40% of the sys- Allow the DDS9m to warm up for at least 15 minutes tem clock and steep output filters are provided on before performing any measurements. For best...
- Page 12 Sine Out Amplitude Verification. Note the volt- fication values. age reading. NOTE: 6.7 Set the DDS9m to the values of Table 4. Verify that the oscilloscope amplitude reading remains Allow the DDS9m to warm up for at least 15 minutes within 3dB (1.414 to 0.707) of the value noted in...
- Page 13 8.5 The current values stored in RAM can be read 8.3 The command sequence (bold) is of this form back by the “Dn aaaa” command. N=0 or 1 and (comments after the ‘;’ are not sent to the DDS9m, “aaaa” is the address. but are here for explanation purposes): 8.6 The RAM table is backed-up by a “supercap”...
- Page 14 WARRANTY NOVATECH INSTRUMENTS warrants that all instruments it manufactures are free from defects in material and workmanship and agrees to replace or repair any instrument found defective during a period of one year from date of shipment to original purchaser.
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