CN-0232

Circuit Note

Rev. 0 | Page 4 of 6

CIRCUIT EVALUATION AND TEST

The CN-0232 uses the EVAL-ADF4350EB2Z board for

evaluation of the described circuit, and with some minor

modifications, allows for quick setup and evaluation. The

EVAL-ADF4350EB2Z board uses the standard ADF4350

programming software, contained on the CD that accompanies

the evaluation board. The EVAL-ADF4153EBZ1 evaluation

board comes with the software for the ADF4153 PLL.

Equipment Needed

•

EVAL-ADF4350EB2Z with programming software.

•

EVAL-ADF4153EBZ1 with programming software.

•

5.5 V power supply.

•

R&S SMA100A signal generator or equivalent.

•

R&S FSUP26 spectrum analyzer or equivalent.

•

Two PCs with Windows® XP, Windows, Vista (32-bit), or

Windows 7 (32-bit), one with an USB port and the other

with a printer port. Alternatively, the EVAL-ADF4xxxX-

USB USB adaptor kit can be used instead of the printer

port, if none is available.

The SMA coaxial cable is required to connect RFOUTB+ of the

EVAL-ADF4350EB2Z to RFIN of the EVAL-ADF4153EBZ1. A

simple SMA splitter is also needed to share the reference source

between the two boards. Some flexible microcoaxial cable is

required to connect the output of the ADF4153 loop filter to the

sides of the cable must be grounded to suitable GND points on

each board.

Functional Block Diagram

For this experiment, the EVAL-ADF4153EBZ1 and the EVAL-

ADF4350EB2Z are used. The EVAL-ADF4350EB2Z is selected

because it contains the auxiliary RFOUTB+ output stage, which is

connected via SMA cable to the EVAL-ADF4153EBZ1, as shown

in Figure 4.

Both PLLs use the same reference input (REFIN) frequency;

therefore, an SMA splitter connects the same REFIN to both

boards.

The loop filter output on the EVAL-ADF4153EBZ1 is connected

ensure that no extra noise or spurs appear on the pin. Both

parts are programmed separately. It may be necessary to use

different PCs for each board to ensure no conflicts occur

between hardware drivers.

Getting Started

The UG-110 user guide details the installation and use of the

EVAL-ADF4350EB2Z evaluation software. UG-110 also

contains board setup instructions and the board schematic,

layout, and bill of materials.

The UG-167 user guide contains similar information relevant to

the EVAL-ADF4153EBZ1. Necessary modifications to the board

are the removal of the VCO (Y1). To reconfigure this board as

an input, remove the R7 resistor and change R8 and R9 to 0 Ω.

The PLL loop filter on the ADF4350 board is unused and

should be removed. At this point, the microcoaxial cable can be

used to connect the output of the ADF4153 loop filter (T7) to

that the outer shielding of this cable is connected to a ground

point on both boards.

REFERENCE

FREQUENCY

GENERATOR

(R&S SMA100A)

SPECTRUM

ANALYZER

(R&S FSUP26)

9V BATTERY

POWER

SUPPLY

50Ω

TERM

50Ω

TERM

RFOUTA+

RFOUTA−

RFOUTB+

RFIN+

CP OUT

VTUNE

PC

PC

USB

PRINTER

COM

5.5V

J14

J15

J4

ADF4350

EVALUATION BOARD

(EVAL-ADF4350EB2Z)

J2

J3

RFOUTB−

J5

J1

T4

T7

ADF4153

EVALUATION BOARD

(EVAL-ADF4153EBZ1)

J5

J2

EVAL-

ADF4xxxX-USB

USB

Figure 4. Test Setup Functional Diagram