DSM202
Linear Chirping Source

DSM202 – 2.0 GHz Linear Chirping Source
GENERAL DESCRIPTION
The DSM202 is a linear chirping waveform module that generates two types ofchirping waveforms at 32 clocks per frequency update. The DSM202 can becontrolled using a user-friendly GUI on a PC. The sole RF input source is the 2.0
GHz clock source DDSCK with a minimum input power of 0 dBm. The outputs ofthe module consist of a pair of differential analog outputs: DDSOP and DDSON.

FEATURES•••••••••

11-bit amplitude and 13-bit phase resolution ROM
Input clock frequency up to 2.0 GHz
Frequency update rate of 32 clocks per update
2 running modes: Free run (Continuous) and Burst Run (Triggered)
2 kinds of chirping waveforms: Ramp and Triangle
Programmable marker length
USB 2.0 compliant interface (other interfaces available upon request)
Powered by a 12V AC/DC Power Adapter
5.8 W power consumption (at 2.0 GHz clock)Figure 1 – DSM202 Module Snapshot

Rev 3-1-DSM202
Linear Chirping Source

Electrical Specifications
Parameter
Operating Temperature
Output Level (V out )Output Power (P out )Residual phase noise* (Nf )Output Port Return Loss (RLRF )Power Supply Voltage (V)Power Supply Current (I)Min

Typical25

Max-635-4-145
1512V
480Units
C°0mV
0dBm
dBc/HzdBVmA*1 KHz away from carrier

Detailed Specifications
GeneralDDS Frequency Resolution
Frequency Update Rate
Running Modes

User Interface
Input ClockType
Connector TypeFrequency Range
Power Level
Return Loss
Output
TypeConnector Type
Output Sampling Rate Range
Output Maximum Frequency
Output Level
Output Power
Residual Phase Noise
Output Return Loss
TriggerConnector TypeSource
Logic Level Standard32 bits
32 clocks per update
Continuous
Triggered Continuous
Triggered Burst
Windows Graphical User Interface, USB
Single Ended 50Ω terminated
SMA
1.0 GHz to 2.0 GHz0 dBm to 10 dBm
10 dB
Differential, 50Ω terminatedSMA
1 GSPS to 2 GSPS
Half of sampling rate
-635 mV to 0 V-4 dBm to 0 dBm-145 dBc/Hz @ 1KHz
15 dB
SMA
External or Software
LVCMOS 3.3 V

Detailed Specifications Continued
Waveforms
Max Waveform Length
Minimum Waveform Length
Waveform Types
MarkerNumber of Markers
Marker Level
Marker Length

Rev 3Continuous
16 data points
Ramp and Triangle1
LVCMOS 3.3 V
Programmable-2-DSM202
Linear Chirping Source

Waveform Snapshots
The following snapshots feature the DSM202 module’s startup waveform
parameters running at different modes and waveform types. The startup
waveform starts at 7.8125 MHz, stops at 125 MHz, and has step of 7.8125 MHz.
The input clock frequency for all four outputs is 2.0 GHz.

Figure 2- Ramped Chirping Waveform in Free Run Mode

Rev 3-3-DSM202
Linear Chirping Source

Figure 3- Ramped Chirping Waveform in Burst Run Mode

Figure 4- Triangular Chirping Waveform in Free Run Mode

Rev 3-4-DSM202
Linear Chirping Source

Figure 5- Triangular Chirping Waveform in Free Run Mode

The DSM202 module has a minor flaw to the triangular chirping waveform due todifficult synchronization issues. A spike occurs at the end of the triangularchirping waveform. Besides this imperfection, the waveform output is correct.

Rev 3-5-DSM202
Linear Chirping Source

Board Diagram

Figure 6- DSM202 Module Board Diagram

Physical Dimensions
LengthWidth
HeightMounthole Locations:(in mils)

Rev 3

4 inches (nominal)
4 inches (nominal)
0.6 inches (nominal)
1.
2.
3.
4.

(125 , 3875)(125 ,125)(3875 , 125)
(3875 , 3875)-6-DSM202
Linear Chirping Source

Euvis Inc.
Ordering Information:
Email to: Sales@euvis.com
Or call: (805) 583-9888 x108 Sales Department
Or fax: (805) 583-9889
The information contained in this document is based on measured data andsimulation results. Characteristic data and other specifications are subject tochange without notice. Customers are advised to confirm information in thisadvanced datasheet prior to using this information or placing the order.
Euvis Inc. does not assume any liability arising from the application or use of any
product or circuit described herein, neither does it convey any license under its
patents or any other rights.

Rev 3-7-