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UG-207

Evaluation Board User Guide

Rev. A | Page 14 of 16

RAM OPERATION

Figure 13. Profiles Window When Using the RAM

Use of RAM on the AD9910 should not be attempted without
using the AD9910 data sheet as a reference. The AD9910 data
sheet contains detailed information on RAM operation. To use
the RAM on the AD9910, select the

Enable RAM

check box

on the

Profiles

window. This changes the appearance of the

window from single-tone mode to RAM control mode.

Each

RAM Segment

section corresponds to a different profile.

RAM Segment 0

corresponds to

Profile 0.

Use the

Beginning

Address

and

Final Address

text boxes to set the beginning and

ending addresses for the RAM sweep. The

Address Step Rate

sets the 16-bit address step rate value. The

Mode Control

drop-

down box sets the 3-bit RAM control word mode. See the
AD9910 data sheet for a complete description of the RAM
operating modes. The

Zero Crossing

check box sets the zero-

crossing bit. This bit is effective only in RAM mode using direct
switch. The

No Dwell

check box

sets the no-dwell high bit. This

bit is only effective when the RAM mode is in ramp-up.

Use the

Activate

area to switch between profiles. Use the

Internal Profile Control

drop-down box to select the internal

profile control configurations. Refer to the AD9910 data sheet
for detailed information on the RAM internal profile control
modes. Use the

RAM Data Type

drop-down box to select the

RAM playback destination. Refer to the AD9910 data sheet for
further details on the RAM playback destination bits.

Use the

LOAD

button to display the

RAM I/O

window.

RAM I/O

Figure 14. RAM I/O Window

Содержание AD9910

Страница 1: ...Factory tested and ready to use PACKAGE CONTENTS AD9910 evaluation board AD9910 PCBZ installation software CD USB cable GENERAL DESCRIPTION This user guide describes how to set up and use the AD9910 evaluation board The AD9910 is a 1 GSPS DDS with a 14 bit DAC The evaluation board software provides a graphical user interface GUI for easy communication with the device along with many user friendly ...

Страница 2: ... Driver 5 Launching the Program 5 Control Window 7 Profiles Window 9 Single Tone Mode 9 View Windows 11 OSK and Digital Ramp Control 12 Multichip Sync Control 13 RAM Operation 14 Debug 15 Register Map Software Buffer Values 15 REVISION HISTORY 10 10 Rev 0 to Rev A Document Title Changed from AD9910 PCBZ to UG 207 Universal Updated Format Universal Changes to Device Clock Oscillator Options Section...

Страница 3: ...k multiplier and connects through J1 The third option allows the user to connect a crystal resonator on the backside of the board Note that the AD9910 evaluation board does not populate the PLL loop filter components Therefore to use the internal PLL of the AD9910 the user must solder down these components or else the PLL is not stable The AD9910 data sheet has helpful formulas to calculate the ap...

Страница 4: ... multidevice synchronous operation DAC Output These connections represent the filtered or unfiltered default output of the DAC Clock Mode Select This connection controls whether the reference clock source is a 20 MHz to 30 MHz crystal or is from an external signal generator A 25 MHz crystal is provided on the underside of the AD9910 evaluation board Ref Clock Input This is the input for the extern...

Страница 5: ...ard After the window has disappeared the USB Status LED CR2 on the AD9910 evaluation board flashes which indicates that the evaluation board is connected properly Windows XP Users 1 Power up the AD9910 evaluation board see Table 2 2 Connect the evaluation board to the computer via the USB port using a USB cable Then the VBUS LED CR1 on the AD9910 evaluation board illuminates 3 When the USB cable i...

Страница 6: ... to scroll up and view the details and possible cause of the error see Figure 3 Most status message errors can be resolved by checking jumper settings making sure that the evaluation board is powered up correctly and inspecting the USB port and cable connections When all power USB port cable connections and jumper settings are correct an error may still appear if the clock input is not properly co...

Страница 7: ... selects the charge pump current output of the PLL in the reference clock multiplier circuitry Selecting a higher current output results in the loop locking faster but there is a trade off Increasing this current output also increases phase noise The default setting of this drop down box is 387 μA VCO Range allows you to select the range of operation for the VCO on the AD9910 The AD9910 evaluation...

Страница 8: ... current of the DAC This number is based on a DAC_RSET resistor value of 10 kΩ Setting Other Control Window Options Enable I O Sync Clock Output Pin allows you to enable or disable the output driver for the I O sync clock output Enable Matched Latency allows you to align the application of the frequency tuning word the phase offset word and the amplitude scale factor at the same time If this bit i...

Страница 9: ... has 14 bits of resolution Note that this can be used in conjunction with DAC Gain Ctrl in the AUX DAC Control section see Figure 5 to increase the flexibility of the output amplitude The spin boxes for amplitude SF are set to 1 bit by default The number of bits can be changed to your preference by typing in the spin box Data Entry Windows The Edit output frequency dialog box see Figure 7 appears ...

Страница 10: ...exadecimal or binary format This window also allows you to type in a tuning word and see the correct decimal hexadecimal or binary representation for this word The Output Scale Factor spin box allows you to scroll through the different tuning words one bit at a time using the up and down arrows 07481 008 Figure 9 Edit Output Scale Factor Pop Up Dialog Box Activate In the Activate area of the Profi...

Страница 11: ...ion Board User Guide UG 207 Rev A Page 11 of 16 VIEW WINDOWS To access additional windows select View from the AD9910 Evaluation Software drop down menu bar 07481 017 Figure 10 Windows Accessed from View Menu ...

Страница 12: ...te box allows you to reload the digital ramp rate when an I O update is issued or when there is a profile change Sweep Frequency 0 and Sweep Frequency 1 are the starting and stopping frequencies of the ramp Note that this is frequency phase or amplitude depending on which ramp generator is selected It is important that the value in the Sweep 0 register is always less than the value in the Sweep 1 ...

Страница 13: ...7481 010 Figure 12 Multi Chip Sync Window The Multi Chip Sync window allows you to set up the sync function This allows you to sync multiple chips to one master AD9910 Refer to the AD9910 data sheet for a full description on multichip sync functions The Input Sync Pulse Delay drop down box sets the input delay of the synchronization receiver in 150 ps steps The Output Sync Pulse Delay sets the out...

Страница 14: ... 16 bit address step rate value The Mode Control drop down box sets the 3 bit RAM control word mode See the AD9910 data sheet for a complete description of the RAM operating modes The Zero Crossing check box sets the zero crossing bit This bit is effective only in RAM mode using direct switch The No Dwell check box sets the no dwell high bit This bit is only effective when the RAM mode is in ramp ...

Страница 15: ...TL DRHOLD REGUD OSK P3 P2 and P1 check boxes control their selected pins REGUD issues an I O update to the device under test DUT whereas REGUD_EN allows the software to control the I O_UPDATE pin P3 P2 and P1 control the profile register pins See the AD9910 data sheet for the logic to control the profiles via the external pins DUT Signals CTL The SCLK serial clock pin check box is used to synchron...

Страница 16: ...sublicense or distribute the Evaluation Board and ii permit any Third Party to access the Evaluation Board As used herein the term Third Party includes any entity other than ADI Customer their employees affiliates and in house consultants The Evaluation Board is NOT sold to Customer all rights not expressly granted herein including ownership of the Evaluation Board are reserved by ADI CONFIDENTIAL...

Страница 17: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Analog Devices Inc AD9910 PCBZ ...

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