AD9510-VCO/PCB Analog Devices Inc, AD9510-VCO/PCB Datasheet - Page 5

• Manufacturer Part Number: AD9510-VCO/PCB
• Description: BOARD EVAL CLOCK DISTR 64LFCSP
• Manufacturer: Analog Devices Inc

Specifications of AD9510-VCO/PCB

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PHASE-LOCKED LOOP (PLL)
The on-chip PLL frequency synthesizer requires an external
oscillator and charge pump filter to operate. The AD9510
evaluation board has three options to provide an external
oscillator: an on-board VCXO, an on-board VCO, or an off-
board oscillator. All three options require an appropriate charge
pump filter. For the on-board configurations, pads are provided
for the charge pump filter. If the off-board configuration is
desired, an SMA allows the user to take the charge pump
current to another board.
Configuration Options
There are three primary configurations for the AD9510
evaluation board when using the PLL. A VCXO, a VCO, or an
off-board oscillator and charge pump filter can be used. If the
PLL is not used, but the CLK2 input is still desired, the board
should be configured as if an off-board oscillator was being used.
A summary of configuration components is presented in Table 3.
Using the VCXO (Default Setup on AD9510-VCO/PCB)
To configure the AD9510 evaluation board for use with a
VCXO, the first step is to populate the board with the VCXO
and an appropriate charge pump filter. These components
should be placed on the top of the board. Next, the CLK2 SMA
must be electrically disconnected from the part by the removal
of Balun T3.
In addition, the signal traces from the VCXO that is to be
shorted to the part input traces through 0 Ω resistors at R33 and
R34. The charge pump trace should be shorted to the VCXO
charge pump filter through a 0 Ω resistor at R8. There should be
no resistors at R38 or R6 for the VCXO configuration. Finally, a
0 Ω resistor is placed at R35 [R37] to reference the charge pump
filter to GND [V_OSC/VCP].
Table 3. PLL Configuration Components
PLL Configuration
Not in Use
VCXO
VCO
Off-Board Oscillator
Table 4. AD9510 Evaluation Board Configurations
Part Number
AD9510/PCB
AD9510-VCO/PCB
VCXO
Required
PLL Configuration (Default)
No VCO/VCXO
VCXO
VCO
Required
Rev. 0 | Page 5 of 28
T3
Required
Open
Required
Required
Oscillator Frequency (Default)
N/A
245.76 MHz
Using the VCO
To configure the AD9510 evaluation board for use with an
on-board VCO, the first step is to populate the VCO and VCO
charge pump filter on the bottom of the board. Just as with
the charge pump filter for the VCXO, the VCO charge pump
filter needs to be referenced to V_OSC/VCP or GND. This
can be accomplished by placing a 0 Ω resistor at R29 or R31,
respectively. Next, the charge pump current trace from the
part must be connected to the charge pump filter. This is
accomplished by placing a 0 Ω resistor at R38 and R6. In
addition, there should be no resistor at R8. Next, the VCO
output needs to be connected to the CLK2 input trace. This is
accomplished placing a 0 Ω resistor at R9. Finally, the CLK2
input must be configured for single-ended input. Any resistors
at R33 and R34 should be removed and then Balun T3 should
be replaced. (See the Single-Ended Input Configuration
section.)
Using an Off-Board Oscillator and Charge Pump Filter
To configure the AD9510 evaluation board for use with an off-
board oscillator and charge pump filter, the charge pump output
SMA and CLK2 SMA input (through Balun T3) must be
connected. The charge pump SMA is connected by removing
any resistors at R8 or R6, and placing a 0 Ω resistor at R38. The
CLK2 input can be configured by first removing any resistors at
R9, R33, R34, and then placing a balun at T3.
Default PLL Configuration
Depending on the evaluation board part number, the
AD9510/PCB can come with or without a 245.76 MHz VCXO.
R33
Open
0 Ω
Open
Open
R34
Open
0 Ω
Open
Open
R8
Open
0 Ω
Open
Open
Charge Pump Filter (Default)
Not Present
Present
R38
Open
Open
0 Ω
0 Ω
AD9510/PCB
R6
Open
Open
0 Ω
Open