Analog Devices UG-200, User Manual

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Evaluation Board User Guide UG-200
Rev. 0 | Page 3 of 28
EVALUATION BOARD HARDWARE
The AD9467 evaluation board provides all of the support
circuitry required to operate the AD9467 in its various modes
and configurations. Figure 2 shows the typical bench charac-
terization setup used to evaluate the performance of the AD9467.
It is critical that the signal sources used for the analog input and
clock have very low phase noise (<1 ps rms jitter) to realize the
optimum performance of the signal chain. Proper filtering of
the analog input signal to remove harmonics and lower the
integrated or broadband noise at the input is necessary to
achieve the specified noise performance (see the AD9467
data sheet).
See the Evaluation Board Software Quick Start Procedures
section to get started and Figure 17 to Figure 31 for the
complete schematics and layout diagrams that demonstrate
the r outing and grounding techniques that should be applied
at the s ystem level.
POWER SUPPLIES
This evaluation board comes with a wall-mountable switching
power supply that provides a 6 V, 2.5 A maximum output. Connect
the supply to the rated 100 V ac to 240 V ac wall outlet at 47 Hz
to 63 Hz. The other end is a 2.1 mm inner diameter jack that
connects to the PCB at P700. Once on the PC board, the 6 V
supply is fused and conditioned before connecting to low dropout
linear regulators that supply the proper bias to each of the various
sections on the board.
When operating the evaluation board in a nondefault condition,
E704, E705, E706, E707 can be removed to disconnect the
switching power supply. This enables the user to bias each section
of the board individually. Use P700 and P701 to connect a different
supply for each section. At least one 1.8 V supply is needed with
a 1 A current capability for 1.8 V AVDD1 and 1.8 V DRVDD;
however, it is recommended that separate supplies be used for
both analog and digital domains. An additional supply is also
required to supply 3.3 V to the DUT, 3.3 V AVDD2. This should
also have a 1 A current capability. To operate the evaluation board
using the SPI and alternate clock and amplifier options, a separate
3.3 V analog supply is needed in addition to the other supplies.
The 3.3 V supply, or 3.3 V 3P3V_AVDD, should have a 1 A
current capability.
INPUT SIGNALS
When connecting the ADC clock and analog source, use clean
signal generators with low phase noise, such as Rohde & Schwarz
SMA or HP8644B signal generators or the equivalent. Use a 1 m
shielded, RG-58, 50 Ω coaxial cable for making connections to
the evaluation board. Enter the desired frequency and amplitude
(refer to the specifications in the AD9467 data sheet).
If a different or external ADC clock source is desired, follow the
instructions in the Clock Circuitry section or use the on-board
crystal oscillator, Y200. Typically, most Analog Devices, Inc.,
evaluation boards can accept ~2.8 V p-p or 13 dBm sine wave
input for the clock. When connecting the analog input source,
it is recommended to use a multipole, narrow-band band-pass
filter with 50 Ω terminations. Analog Devices uses TTE and
K&L Microwave, Inc., band-pass filters. The filter should be
connected directly to the evaluation board.
OUTPUT SIGNALS
The default setup uses the FIFO5 high speed, dual-channel
FIFO data capture board (HSC-ADC-EVALCZ). For more
information on this board and its optional settings, visit
http://www.analog.com/fifo.