High Power 2 Channel RF Driver:For 2 Acousto-optic Q-Switches

MQH0XX-YYDM-ZZZ-2S
Former Model Number:390XX-YYDMZZZ-2CH-A

Description:

Key Features:

The MQH0XX-YYDM-ZZZ-2S module is a HighPower RF Driver with two RF outputs derived
from one oscillator and is designed to drive
two Q-Switches. There are two digitalmodulation control inputs: Fixed andVariable. These controls allow the customer
to issue a pulse command of a "Fixed" pulsewidth, the duration determined by theDriver's pulse width control, settable by thecustomer, or issue a "Variable" pulse
command, the duration determined by theinput signal’s pulse width. The output powerof both channels are controlled by the analog
input, where the mode of operation is definedby ZZZ = A05 normal analog mode, or R05
analog switched to full RF mode or atriggered RF Ramp Down mode where ZZZ =FPS first pulse suppression mode or PPK
pre-pulse kill mode. The choices ofFrequency (XX), Output Power (YY), andPower Control (ZZZ) option are "Factory Set"
when ordered. The driver requires forced aircooling.




24, 27.12, 40.68, 68, or 80 MHz RFFrequency (XX)0.01% Quartz Stabilized
2 Outputs with up to 50 watts RF poweroutput (YY) per channel (2S)
Two TTL Digital Modulation Inputs: fixedand variable pulse width.
Up to 100 kHz pulse rate.
Analogue Modulation or Triggered RF
Ramp Down Mode (ZZZ)
Fault Protection on Low Power, HighPower, and High VSWR
Operates on 28 VDCApplications:RF Driver for an Acousto-Optic Q-Switch
Device used spoiling the “Q” of a CW
laser so as to output an intense pulse oflight.

Used in industrial, medical, or military
applications.

The product delivered will be manufactured
to be compliant with EU Directive 2011/65/EU
for Reduction of Hazardous Substance. Theproduct will be manufactured to otherstandards upon customer request.

IWDS039 V1.0

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MQH0XX-YYDM-ZZZ-2S
SPECIFICATIONSPARAMETER:SPECIFICATION:

Number of Channels

2 Outputs

Output Frequency:

XX = 24, 27, 41, 68, or 80
Where RF Frequency = 24.00, 27.12, 40.68, 68.00, 80.00 MHz ± 0.01%

Spurious Levels:-50 dBc maximum

Harmonic Distortion-30 dBc maximum

Digital Inputs:
Fixed Mod In
Variable Mod In

Modulation Common to Both Outputs.
TTL Levels, Triggered on Rising Edge. Pulse Width Applied >50 ns.
TTL Levels, TTL HIGH = RF off

Extinction Ratio:

35 dB minimum

RF Rise Time 10% to 90%

500 ns maximum

RF Fall Time: 90% to 10%

100 ns maximum

Modulation Repetition Rates:

1 Hz to 100 kHz for Fixed Modulation
DC to 100 kHz for Variable Modulation

Fixed Modulation

Output Pulse Width Adjustment Range: 1 to 14 s, Customer Adjustable(RF Power Split from One Oscillator.)

Available Pulse Control Options:
ZZZ = ModePulse Control Mode is "Factory Set When Ordered":FPS = First Pulse Suppression
PPK = Pre Pulse Kill
A05 = Analog Control
R05 = RF Switched to Analog Control___ = Digital Modulation OnlyFPS Trigger / Analog input

See Figure 2
See Figure 3
See Figure 4
See Figure 5
See Figure 6

Units Configured With FPS, PPK: TTL Levels, Triggered on TTL
Rising Edge.
Units Configured With A05, R05:

0 to 5 Volts Analog.

RF Output Power Per Channel "Factory Set When Ordered": YY = 50 watts nominal for 24, 27, and 41MHz units
Both Outputs Must Have 50 ohm Load
Adjustable from 12 to 50 watts.
*25 watts nominal for 68 and 80 MHz unit, Adjustable from 12 to 25 watts.
Output Impedance:

50 ohms Nominal

Shutter Output:

0.3 sec delay. Opens on fault.
Capable of sinking 1 amp at 28 volts maximum.

Supply Voltage Input+28 VDC  1%

Supply Current Input

6.5 A for 25 W /ch units 9.0 A for 50 W /ch units

Operating Temperature+10C to +55C

Air Flow through Heat Sink

> 36 CFM (> 17 litres / second) @ 25CMAXIMUM RATINGS:
Supply Voltage:

30 volts DC maximum

Power Output:

No DC Feedback allowed

Storage Temperature:-20C to +85CPage 2 of 11

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CONNECTORS & MECHANICAL:

Located on front panel

RF Output Connector:

BNC Female

Power Supply Connections:

Vcc
Solder PostReturn Ground Lug

25PIN SUB D CONNECTOR PINOUT:

Located on front panel See Detail A of Outline Drawing.

1+5V+5V output for external fault indicators, 75 mA available.

2–3

NCNo connection.

4THERM RTN

Ground – to be used as a return for Both THERM and THERM 2.

5

THERM 2

Thermostat connection – driver enters a fault condition unless this is shorted to ground.

6THERM

Thermostat connection – driver enters a fault condition unless this is shorted to ground.

7DRV TEMP

Normally HIGH, goes LOW when the driver is in an overheat fault.

8QS TEMP

Normally HIGH, goes LOW when no short present on THERM.

9HVSWR

High VSWR fault, normally HIGH, goes LOW during fault.

10LP

11HP

Low RF Power indicator, normally HIGH, goes LOW while driver output is below theLow RF Power threshold.
High RF Power fault, normally HIGH, goes LOW during fault.

12MOD IN ANALOG

13

FAULT RESET

Pulse LOW to reset the driver from a fault condition. This line should not beheld LOW or it will defeat some of the fault conditions.

14FPS TRGTriggers a suppression pulse on a RISING edge.

15

MOD IN FIXED

Turns the driver off for the duration set by the pulse width control.

16

MOD IN VARIABLE

Turns the driver off while this input is HIGH.

17

SYNC OUT

Outputs a signal synchronized to the modulation output.

18-19

NC

No connection.

20

SHUTTER

0.3 sec delay. Opens on fault. Capable of sinking 1 amps at 28 volts maximum.

21 -24NC

No Connection

25

GNDGround.

Controls the output power level in A05 and R05 models

Note: Some Control Signals Shown on Outline Drawing are Not Available on Standard Units.
INDICATORS:

Located on front panel

PowerPower Indicator – The module has 28V applied on the DC connector.

Low PowerFaults after 0.3 second, power below LP Set Point.
Resets on power adjusted above Set Point.

High Power

Faults when power above HP Set Point.
Reset required after removing fault.

High VSWR

Faults when reflected power above VSWR Set Point.
Reset required after removing fault.

QS Temp

Faults on open Thermostat.
Resets on closed Thermostat. (Q-Switch below set temperature)

DRV Temp Driver

The internal temperature of the module has reached 60C. The driver willremain in this fault condition until it cools down.

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ADJUSTMENTS:

Located Inside Unit Through Holes in Module Top Cover

RF Power Level Adjustment

Adjusts the output RF Power.

LP Set Point

Adjusts the minimum power threshold. If the module’s output goes below
this set value, the low power warning light will turn on, but the driver willcontinue to output power. This is a warning, not a true fault condition.

HP Set Point

Adjusts the maximum power threshold for the module. If the output rises
above this threshold, the module will cease output until it is reset.

VSWR Set Point

Adjusts the module’s tolerance for a mismatched load connected to RF Out.
If a mismatch is detected, the driver will cease outputting power until reset.

Pulse Width

Adjusts the length of time the driver outputs no RF energy after receiving atrigger. 1s to 14s.

The following adjustment is not used on units configured with FPS or PPK:
ThresholdSets the point below which the analog voltage is ignored and the system
output is shut off.

The following adjustments are not used on units configured with Analog Input (A05, R05):
FPS Start

Adjusts the initial power level of the first pulse.

FPS Slope

Adjusts how quickly the RF pulses return to their normal level after the FPS
has been triggered. 20 s to 300 s.

FPS Window

Adjusts the duration of the suppression pulse cycle. 20 s to 300 s.

Note: Some Adjustments Shown on Outline Drawing are Not Available on Standard Units.

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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeMechanical Dimensions:
Dimensions in inches and [mm]Page 5 of 11

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Control Diagrams
Figure 2

MQH0XX-YYDM-ZZZ-2S (HIGH POWER) First Pulse Suppression Control
Connection and Control Diagrams

External Fault Indicators

HPLP

HVSWR

QS Temp

DRV Temp

Thermostat on Q Switch

NC

Fault Reset+5V Output

14514 15 16 17678910 11 12 132025

Shutter Out

C A B
Sync OutTTL HIGH

Mod InA
Fixed TTL LOW
Mod In TTL HIGH
VariableB

TTL LOWCTTL HIGH
FPS
Trigger
TTL LOW

RF OutPulse Width
1-14 μsFPS Window
20-300 μs

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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeFigure 3

MQH0XX-YYDM-ZZZ-2S (HIGH POWER) Pre-Pulse Kill Control
Connection and Control diagrams

HPLP

HVSWR

QS Temp

DRV Temp

Thermostat on Q Switch

External Fault Indicators

NC+5V OUTPUT

Fault Reset

141415165617789101120121325Shutter Out

C A B
Sync OutTTL HIGH

Mod InA
FixedB

TTL LOWMod In TTL HIGH
Variable
TTL LOW

CFPSTrigger

TTL HIGH

TTL LOW

RF OutPulse Width
1-14μsFPS Window
20-300μs

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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeFigure 4

MQH0XX-YYDM-ZZZ-2S (HIGH POWER) Analog 5 Volt Control
Connection and Control Diagrams

External Fault Indicators

HP

LP

HVSWR

QS Temp

DRV Temp

Thermostat

Fault Reset

C1414NCA

Mod InFixed15166717

A B

89101112201325

Shutter Out
Sync OutTTL HIGH

TTL LOWB

Mod InVariable

TTL HIGH

TTL LOW
5V

Mod InCAnalog
Threshold0VRF OutPulse Width
1-14 μs

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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeFigure 5

MQH0XX-YYDM-ZZZ-2S (HIGH POWER) RF Switch to Analog 5 Volt Control
Connection and Control Diagrams
DRV QS HV
Te Te SWmp mp R

Thermostat on Q Switch

LP HP

External Fault Indicators

CFault Reset+5V OUTPUT

1414NCAMod InFixed151656717A B89101120121325

Shutter OutSync OutTTL HIGH

TTL LOWMod InB
Variable

TTLHIGH

TTL LOWCMod InAnalog

5VThreshold0V

RF OutPulse Width
1-14 μs

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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeFigure 6

MQH0XX-YYDM-ZZZ-2S (HIGH POWER) Digital Control Only
Connection and Control Diagrams

Thermostat on Q Switch
DRQS
V
Te Te
mp mp

HVSW
RLPHP

External Fault Indicators
Mod in Analog(Not Used for thisControl Mode.)+5V OutputFault Reset

1414FPS Trigger(Not Used for thisControl Mode.)

15567816 1791011 12201325Shutter OutA BSync Out

TTL HIGHMod InA
FixedMod In
B
Variable

TTL LOWTTL HIGH

TTL LOW

RF OutPulse Width
1-14 μs

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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeOrdering Codes:
Example: MQH027-50DM-A05-2SA two channel 27 MHz RF Driver with two TTL Digital Modulation inputs (fixed and variable pulsewidth) and an analog input (A05) which enables control of the RF output power. Designed to
Drive two AO Q-Switches requiring 50 watts RF Power or less per channel. Delivered as a RoHS
compliant, forced air cooled OEM Module.
Optional

M Q H X X X

Option- Y Y D M -Option

Z Z Z

Code – StandardFrequencies
024 24.000MHz
027 27.120 MHz
041 40.680 MHz
068 68.000 MHz
080 80.000 MHz-

Optional

2 S -Optional company
information if customized(2 letters +number)
RF Split into 2 Outputs
Code – Standard Control Options
A05 – Analog 0 to +5 V Power Control
R05 – Analog 0 to +5 V Power Control - Switched
FPS – First Pulse Suppression
PPK – Pre Pulse Kill
No Code when specified as TTL Digital only

Q-Switch DriverM – OEM Module
S – Rack Mountable Box
D - Digital
RF Power 12 to 50
Watts range

Technical Assistance & Customization
Our Engineering and Sales team are available to discuss your requirements and will assist you
in selecting the most appropriate acousto-optic Q-Switch/ Driver combination for your application.

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As part of our policy of continuous product improvement we reserve the right to change specifications at any time