FREQUENCY SYNTHESーZER UNーT DSG
Contents
1. FREQUENCY SYNTHESIZER UNIT DSG 2235 USER S MANUAL DIGITAL SIGNAL TECHNOLOGY INC 1 6 28 HIGASHI BENZAI ASAKA CITY SAITAMA JAPAN 351 0022 TEL 81 48 468 6094 FAX 81 48 468 6210 e mail info dst co jp 1 Description The programmable PLL unit DSG 2235 can generate any desired signal from 2250MHz to 3550MHz with 1Hz resolution 2 Specification 2 1 Electrical specification 1 Output frequency range 2 Frequency resolution 3 Output level 4 Output impedance 5 Frequency stability 6 Phase noise 7 Spurious 8 Harmonics spurious 9 Supply voltage current 10 How to set frequency 2 2 Environment Specifications 1 Operating temperature range 2 3 Construction and dimensions 1 Dimensions 2 Output connector 3 Reference input connector 4 5 Power Supply 6 Weight 4 Frequency control connector 2250MHz 3550MHz 1Hz 10dBm 2dB 500 1ppm 90dBc Hz at 100KHz less than 55dBc less than 10dBc 6V 15 less than 1A 15V 10 less than 0 2A RS 232C asynchronous serial data 0 C 50 C 125x110x27mm not including connectors See the drawing of 0010785 SMA J SMA J D SUB 9 pin female Feed through capacitor lead 460g 3 Control command 3 1 Asynchronous Communication setting speed 9600BPS data length 8 bit stop bit 1 bit parity None flow control None 3 2 D SUB 9 pin connector pin2. assignment pin signal name equipment lt gt terminal Remarks 1 CD not used 2 RD gt 3 TD e 4 not used 5 GND O 6 DSR not used 7 RTS not used 3 3 Type of control command 1 Frequency setting command This is to set output frequency 2 STAT command This is to confirm the setting value 3 SAVE command This is to memorize the current frequency 4 EXT command This is to switch the reference clock input source to internal or external 4 Details of the control command 4 1 Definition Character strings with is ASCII code CR LF are the control command and mean OD hex or OA hex If the data format is not correct or some errors occurred during the transfer INVALID LF CR will be returned When the command is transferred correctly code is returned DSG 2235 is echo backed all input data 4 2 Frequency setting command Frequency data can be entered in three different types of formats MHz KHz and Hz 7 1 How to set frequency at MHz unit The example below shows the data of setting 2479MHz 2479M CR In this case the data under 100KHz is set 0 2 How to set frequency at KHz unit The example below shows the data of setting 2479001 KHz 2479001K CR In this case the data under 100Hz is set O 3 How to set frequency at Hz unit The example below shows the data of setting 2479000001 Hz 2479000001 CR Cautions When DSG 2235 has optional frequency divider the out
3. put frequency is divided according to the optianl divider ratio 4 3 STAT command When STAT CR is entered the current status of DSG 2235 is obtained The response format is as follows H HZ ssssss CR LF x f shows the present output frequency at Hz sssss shows the status of PLL lock displayed LOCK OR UNLOCKED 4 4 SAVE command When SAVE CR is entered the current frequency can be memorized into non volatile RAM When power is off and on again the stored frequency can be retrieved 4 5 EXT command When EXT CR is entered the status of reference clock source is displayed as follows CURRENT CLOCK SOURCE IS XXXXXX Do you want to change clock source Y N xxxxxx Should be displayed EXTERNAL or INTERNAL If changed input is i 5 Cautions 5 1 Use the power supply stabilized by low noise series regulators When the switching power supply is used use filter to reduce switching noise from power supply 5 2 Attach DSG 2235 side panel to chassis or heat sink not to raise the units temparature mi OLOO aquny Suimoug rr nu tazrpoug Pa A li Sel GAGYI
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