Datasheet

UG-161 EV-ADF411XSD1Z User Guide

Rev. A | Page 4 of 28

EVALUATION BOARD HARDWARE

The evaluation board requires the use of an SDP-S motherboard to

program the device. The SDP-S is not included with the evaluation

board. The EV-ADF411XSD1Z schematics are shown in Figure 37,

Figure 38, and Figure 39.

POWER SUPPLIES

The board is powered from external banana connectors. The

voltage can vary between 6 V and 12 V. The power supply circuit

provides 3.0 V to the V

of the frequency synthesizer and allows

the user to choose either 3.0 V or 5 V for the V

of the frequency

synthesizer. The default settings for V

and V

are 3.0 V and

5 V, respectively. Note that V

should never exceed 3.3 V because

exceeding this voltage level may damage the device.

External power supplies can be used to directly drive the

frequency synthesizer. In this case, the user must insert SMA

connectors as shown in Figure 2.

INPUT SIGNALS

A 10 MHz TCXO reference source from Fox Electronics is fitted as

the default option. An external reference generator can also be used

as the reference input. A low noise, high slew rate reference source

is required to achieve the specified performance of the frequency

synthesizer. An SMA connector fitted to J11 can be connected to an

external reference generator and used as the reference source. If

preferable, the edge mount connector, J5, can be inserted and used

instead of J11. To use any external reference option, remove the 0 Ω

R16 and R14 links.

Digital SPI signals are supplied through the SDP connector, J1.

The SDP-S board is recommended. The SDP-Blackfin (SDP-B)

board can also be used, but Resistor R57 must be removed from

the SDP-B board. Some additional spurious low frequencies

may appear if the SDP-B connector is used.

Figure 2. Evaluation Board Silkscreen

OUTPUT SIGNALS

The PLL comprises the frequency synthesizer, a passive loop

filter, and the VCO. The VCO output is available at RFOUT

through a standard SMA connector, J2. The MUXOUT signal

can be monitored at Test Point T8 or at SMA Connector J3.

09146-002