ISOMET RFA741 Series Instruction Manual Download Page 17

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ISOMET

+Vcc

+24Vdc

+Vcc

+Vset

Gnd

Out

Vcc

Gnd

Out

Vcc

PWR
Adj

Mixer

Oscillator

S0 = 1 = Dig Pot
S0 = 0 = Man Adj

Pot
Select

FREQ
Modulation
Input

PA Transistor

4 Channel Digital Pot

RF
Output

RF
SET

Pre-Amp

I2C

GATE
Input

PWR
Adj

Oscillator

Osc
Select

Figure 3: Driver Block Diagram

Summary of Contents for RFA741 Series

Page 1: ...l Models RFA741 40MHz 50 7MHz 180W output Options xxx combinations possible BR Brass water cooled heatsink ISOMET CORP 5263 Port Royal Rd Springfield VA 22151 USA Tel 703 321 8301 Fax 703 321 8546 e m...

Page 2: ...wer Amplifier is a fixed dual frequency RF power source specifically designed to operate with the AOM740 series of acousto optic high power modulators A block diagram of the driver is shown in Figure...

Page 3: ...ts the RF waveform and AO response is shown below Time FREQ MODULATION Input FREQ Modulated RF Output Zero Order Max Laser O P 0 W Ton Minimum not 0 Maximum Maximum Laser O P First Order Control Range...

Page 4: ...is selectable by the user a A manual adjust multi turn potentiometer PWR ADJ for each frequency Maximum RF power fully clockwise or b A quad 256 step digital potentiometer configured to give independ...

Page 5: ...s 32deg C The hysterisis of the thermal switches is 7 10deg C Once in a fault state the coolant temperature may need to be reduced to reset the thermal switches Precautions TTL digital input levels mu...

Page 6: ...r if the RF connection between the AOM and driver is broken Resetting Once the fault condition is corrected it will be necessary to reset the driver 1 Turn the DC power OFF and ON or 2 Press momentary...

Page 7: ...ock input d the DC supply is off The RED LED should be OFF Monitor Outputs The status of the YELLOW and GREEN LEDS is available at the D type connector These outputs are opto isolated 12V 5V 5V 15 way...

Page 8: ...o optic modulator mini 3 pin snap connector to the RF driver INT input mini 3 pin snap connector Connect pin 1 to pin 1 and pin 2 to pin 2 If the temperature of the modulator exceeds 32 C or the inter...

Page 9: ...i e OFF then clockwise CW approx 5 turns 3 8 Apply DC to the amplifier 3 9 Apply a constant TTL high signal to the Freq Modulation input on the D type connector of the RFA741 Connect pin 7 of D to the...

Page 10: ...ptic modulator and the undeflected zeroth order beam Adjust the Bragg angle rotate the modulator to maximise first order beam intensity with the 40MHz Frequency selected 3 13 After Bragg angle has bee...

Page 11: ...W1 Vss A2 B2 W2 SCL AD1 A3 SDA Vdd GNDd W0 B3 W3 10T Pot 50MHz 1 3 2 12 13 1 14 2 4 5 11 10 6 7 8 9 3 Vdd Gnd A0 A1 en S1 S2 S3 S4 D nc nc1 nc2 Vss 15 way D Ty pe 8 15 7 14 6 13 5 12 4 11 3 10 2 9 1 5...

Page 12: ...Pots W3 and W0 apply to both 40MHz and 50MHz powers AD5254 configuration RDAC2 defines the 50 MHz power control factor V50_Control VL VH VL x W2 255 where W2 8 bit value programmed into RDAC2 RDAC1 d...

Page 13: ...6 0 7 0 8 0 9 1 0 V_Control Volts RF Power W By adjusting the values of RDAC0 and RDAC3 it is possible to increase the adjustment resolution of the 8 bit power level control at 40 0 MHz RDAC1 and 50 7...

Page 14: ...ft ball of brushed short fibres removed cotton slightly moistened with clean alcohol Before the alcohol has had time to dry on the surface wipe again with dry cotton in a smooth continuous stroke Exam...

Page 15: ...Normally closed OPTIONAL Enabled monitor Output Signal pin 2 Open collector logic Low OK Return pin 10 Maximum applied voltage via external pull up resistor 24V Maximum current 20mA RF Status monitor...

Page 16: ...ut Binder 719 Series Male Socket 50 6MHz 40 0MHz RF PWR ADJ POT Modulation and Gate Input connections 3 1 2 J1 1 2 15way 8 15 7 14 6 13 5 12 4 11 3 10 2 9 1 J2 1 2 3 1 2 AOM Thermal Interlock Plug OK...

Page 17: ...1 3 2 1 3 2 Gnd En Out Vcc PWR Adj Mixer Oscillator S0 1 Dig Pot S0 0 Man Adj Pot Select FREQ Modulation Input PA Transistor 4 Channel Digital Pot RF Output RF SET Pre Amp I2C GATE Input PWR Adj Oscil...

Page 18: ...deg C DC supply 24Vdc 14A 1 2 3 Interlock Connector Normally Closed Contacts Pins 1 2 Not connected Pin 3 Bragg Angle at 40MHz 9 4um 34 2mrad 10 6um 38 5mrad Bragg Angle 2 1 Main Beam Dummy Beam First...

Page 19: ...o the optical surface and in the plane of deflection is BRAGG fc 2 v The separation angle between the Zeroth order and the First order is SEP fc v Optical rise time for a Gaussian input beam is approx...

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