OPERATING MANUAL

DIGITALLY CONTROLLED

FREQUENCY SYNTHESIZER

MODEL NUMBER: MSD040-150-0.2ADM-A5H-8X1

Formerly R64040-150-0.2ADMDFS-8x1-A

DOCUMENT NUMBER: 51A20405

Document approved for release: W Seale Date: 3/14/09

US OFFICE: Gooch & Housego (Florida) LLC ♦ 4005 Opportunity Drive Melbourne FL 32934 ♦ USA Tel: 1-321-242-7818 ♦ Fax: 1-321-242-1019

UK OFFICE: Gooch & Housego ♦ Dowlish Ford ♦ Ilminster, Somerset TA19 0PF ♦ UK

Tel: +44 (0)1460 256440 ♦ Fax: +44 1460 256441

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TABLE OF CONTENTS

Section Title Page

I INSPECTION PROCEDURE 3

II GENERAL DESCRIPTION 4

III SPECIFICATIONS 5

IV OUTLINE DRAWING 6

V CONNECTOR DIAGRAMS 7

VI COMMAND LIST 10

VII SAMPLE PROGRAMMING STREAM 11

VIII OPERATING PROCEDURE 12

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SECTION I

INSPECTION

Examine the shipping carton for damage. If the shipping carton or packing material is damaged it

should be kept for the carrier’s inspection. . Notify the carrier and Gooch & Housego. Check the contents

of the shipment for completeness, mechanical damage, and then test the equipment electronically.

Operating procedures are contained in Section IX. If the contents are incomplete, or the equipment does

not pass the electrical testing please notify Gooch & Housego.

If there is any problem with the use of this equipment, or if the equipment fails to function as

expected contact Gooch & Housego, do not try to trouble shoot or repair this equipment. Consult with a

Gooch & Housego service engineer. If the equipment needs repair or replacement, contact Gooch &

Housego for a Return Authorization Number.

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SECTION II

GENERAL DESCRIPTION

64040-150-0.2ADMDFS-8x1

The 64040-150-0.2ADMDFS-8x1 is a digitally frequency synthesized driver which has eight

programmable channels coherently mixed into one output channel. It can support any Acousto-Optic

Tunable Filter (AOTF) that operates in the frequency range between 40 and 150 MHz with an output

power of up to 200 mW per channel. The driver can output up to 8 simultaneous frequencies. Each

frequency controls a wavelength of light passing through the AOTF. The frequency, phase, and

amplitude of the output can be adjusted in through the USB connection. Any or all of the channels can be

turned completely off through the USB connection as well. This allows the output of the driver to be

precisely optimized for the individual AOTF. These settings are retained even after the driver has been

turned off. The driver also allows independent analog and digital (blanking) amplitude modulation of

each of the channels through the D-sub 25 pin connector.

The driver also contains a Thermo Electric Cooler (TEC) controller. This allows the driver to

work with optics which use active thermal stabilization.

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SECTION III

SPECIFICATION

PARAMETER SPECIFICATION

Number of Channels: 8

Frequency Stability: + .01%

Power Out: up to 200 mW per channel

Tuning Range: 40 to 150 MHz in 1 kHz Steps

Input through the D-sub 25 pin connector:

Analog Inputs (8): 0-5 volts into 10 k ohms

Blanking Inputs (8): TTL with 4.7 k ohms pull up TTL HIGH or open = full output (not blanked) TTL LOW = minimum output (blanked)

Rise/Fall Time: 150 ns maximum

Extinction Ratio: 70 dB minimum

Intermodulation Distortion -30 dBc maximum with 8 equally spaced frequencies of 100 mW each - Phases set to 4π phase mask.

TEC Output 5A @ 2V maximum

Optimized for a MELCOR CP1.4-17-06L TEC with a

YSI 44006 Thermistor

Applied Power: +24 VDC @ 3A maximum +5 VDC @ 2A maximum (only required if TEC section is active.) Connectors: Part No.

RF out: BNC Female 1-1478035-0

Modulation in: 25 Pin D-Sub Female RDM25SA5

Reference Out SMB Male 1060464-1

RS-232 interface (currently inactive) 9 Pin D-Sub Female RDM9SA5

USB interface USB B style receptacle* 61729-0010BLF

Power + TEC 6 pin 1-794448-1

Remote (currently inactive) 5 pin Spox 22-05-7055

*The software driver connects the communications program to a standard USB port and emulates a standard COM port. The port is USB 2.0 protocol with a data rate is 300K byte/sec

Outline Drawing 53D4875

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SECTION IV

OUTLINE DRAWING

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SECTION V

CONNECTOR DIAGRAMS

D-sub 25 Pin

For Analog Intensity Control and TTL Blanking

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Figure 3 Pinout of TEC connector

Figure 4

Pinout of Power connector

Pin No. Name

1 +24V 2 GND 3 +5 V TEC 4 NC 5 GND 6 NC

Pin No. Name

1 No Connection 2 GND

(Thermistor) 3 No Connection 4 Thermistor 5 TEC P 6 TEC N

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Figure 5 RS 232 connector (currently inactive)

Pin No. Name Dir Notes / Description

1 DCD IN No Connection

2 RD IN Receive Data (a.k.a RxD, Rx). Arriving data from DCE.

3 TD OUT Transmit Data (a.k.a TxD, Tx). Sending data from DTE.

4 DTR OUT No Connection

5 SGND - Ground

6 DSR IN No Connection 7 RTS OUT No Connection 8 CTS IN No Connection 9 RI IN No Connection

DB9: View looking into female connector

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SECTION VI

COMMAND LIST

There are 11 basic commands that communicate with the driver via the USB port. The commands are as

follows:

ch# Sets the active channel. # = 1 - 8 fr ###.### Sets the frequency of the active channel.

Unit are configured for a standard range from ###.### = 40.000 MHz to 150.000 MHz. am #### Sets the amplitude of the active channel. #### = 0 - 1023

Refer to the table for the approximate power level for a given power level (amplitude) setting.

Output Power AMP Level 0 100 200 300 400 500 600 700 800 900 1000 1023

Output Power (mW) 0 5 10 25 30 70 100 135 180 225 280 300

ph ##### Set the phase of the RF relative to the other channels. The control range represents an adjustment from 0 to 2π. ##### = 0 - 16383 Only required in applications in which the frequency has a regular spacing.

on Sets the modulation mode of the active channel.

In this mode, the analog modulation input on the D25 has been deactivated. The "am" command and digital modulation function normally.

mod Sets the modulation mode of the active channel.

In this mode, both the analog and digital modulation input on the D25 control port function normally.

off Turns off the active channel. tec ## Activates the TEC section and sets it to an arbitrary control level.

The control range is from 1 to 99. Temperature set points are listed on the test report of the unit. to Turns off the TEC section. ts Polls the driver for the status of the TEC section. The driver reports the TEC set level. st Polls the driver for the status of the current channel.

The driver reports the Frequency, Amplitude, Phase, and Modulation State of the current channel.

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SECTION VII

SAMPLE PROGRAMMING STREAM Sets the frequency, amplitude, and modulation state of all channels. Puts the TEC controller in the off state.

CH 1 FR 78.19 AM 600 ON CH 2 FR 73.85 AM 600 ON CH 3 FR 71.38 AM 600 ON CH 4 FR 66.39 AM 600 ON CH 5 FR 65.32 AM 600 ON CH 6 FR 58.35 AM 600 ON CH 7 FR 49.72 AM 600 ON CH 8 FR 47.17 AM 600 ON TO

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SECTION VIII

OPERATING PROCEDURE

1. Connect the RF output of the driver to the AOTF or to a good, 50-ohm load.

2. Connect driver to a 24V power supply and apply power.

3. Connect the driver to the USB port on a computer.

4. Follow the procedures outlined by FTDI Chip at www.ftdichip.com/Drivers/VCP.htm to install a

VCP driver on the computer. This step will only need to be done the first time the computer is

connected to the driver.

5. Once this is completed, there should be a virtual COM port active on the computer. The

identification of this unit can be found listed in the port summary of the computer.

Note: Control Panel → Systems → Hardware → Device Manager → Ports (COM & LPT)

6. The driver can now be accessed through any program that connects to the COM port such as

Windows Hyperterminal, PuTTY, or Lab Windows.

7. If using Windows Hyperterminal:

A. Create a new connection.

B. Open Properties in the File dropdown menu.

C. Click the Settings tab.

D. Click the ASCII Setup button.

a. Check Boxes:

ü Send line ends with line feeds

ü Echo typed characters locally

E. Click Ok to continue.

F. Hit Enter before inputting first command.

Note: If an error occurs while inputting a command, hit enter and re-type correct

command.

8. Align the PCAOM / AOTF using the procedures provided with the optic.

9. If the optic uses an alignment wavelength, set a channel to the frequency specified for this

wavelength -- “FR XX.XXX”.

10. Set the power to a relatively low value -- "AM 200".

11. Turn the channel on either by setting modulation state of the channel to "on", or by setting the

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channel to "mod" and providing the proper modulation on the D25 connector to turn on the

channel.

12. Optimize the optical alignment.

13. Increase the RF power by increasing the amplitude in steps of 100 to find the roughly maximized

optical output. Using increments of 10 – 25 make finer adjustments until the optical output is

maximized. *

14. Turn active channel off when all adjustments have been completed.

15. Once the PCAOM / AOTF has been aligned, a similar procedure can be followed for other

wavelengths.

16. Activate the desired channel for the next target wavelength.

17. Set the frequency for the target wavelength as listed on the AOTF's documentation

18. Set the channel amplitude to AM 200.

19. Turn the channel on.

20. Fine-tune the frequency to maximize output.

21. Increase the amplitude to further optimize output, as executed in step 12. *

22. Repeat steps 15 - 20 for any additional wavelengths.

* CAUTION: Be careful to not exceed the electrical power rating of the optic.

To Activate the TEC section:

1. Connect the thermistor and TEC to the TEC interface port on the back of the unit.

2. Connect a 5V supply to the +5V TEC connection on the power connector.

3. Connect driver to a 24V power supply and apply power.

4. Establish an USB connection.

5. Send a “TE 50” command.

6. Verify that the temperature of the optic is approximately the set point listed on the test report. If

the unit starts to heat above 45 degrees C or cool below 15 degrees C, the TEC power connections

may need to be reversed.

7. Operate the unit normally, as specified above.