ADMFM2000ABVZ datasheet(27/28 Pages) AD

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Data Sheet

ADMFM2000

APPLICATIONS INFORMATION

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Rev. 0 | 27 of 28

LAYOUT RECOMMENDATIONS

Solder the ground balls on the underside of the ADMFM2000 to

a low thermal and electrical impedance connection. Utilize multi-

ple ground vias throughout the ground plane on the ADMFM2000-

EVALZ to maximize heat dissipation from the device package.

Referring to the layout shown in Figure 62, the green dots with PCB

traces attached are the inputs and outputs of the ADMFM2000.

The gray dots are the ground vias, and the gray dots that are

encircled in red are vias either to the power plane or vias for

digital control. For more information on the ADMFM2000-EVALZ,

visit www.analog.com/EVAL-ADMF2000.

Ensure that the decoupling capacitors are located as close as

possible to the supply voltage balls.

Figure 62. Evaluation Board Layout for the ADMFM2000-EVALZ, Top View

(Through the ADMFM2000)

VENT HOLE

The ADMFM2000 package contains a vent hole on the top of the

metal lid. Keep this vent hole open during the ADMFM2000-EVALZ

reflow process and cover it with Kapton tape during board wash.

After board washing, remove the Kapton tape. When the fully

assembled PCB is either in storage or operation, the vent hole

must be left open and a gas-permeable tape is recommended for

protecting the ADMFM2000 from moisture and water. If a heatsink

is added on the top of the package, the hole must not be blocked so

that air can circulate.

POWER MANAGEMENT RECOMMENDATIONS

The ADMFM2000 has three voltage supplies, two +5 V supplies

and a −5 V supply, and each supply has different maximum current

requirements. To supply both voltages to several ADMFM2000

devices, follow the power management recommendations detailed

within this section and shown in Figure 63. A 12 V supply is

assumed available in the application, and this supply is used as the

input voltage for two LT8627SP (+5 V) devices and one LTM8074

(−5 V) device.

Figure 63. Power Management

For the two 5 V supplies, the voltage steps down from 12 V to

5 V with the LT8627SP. For the −5 V supply, the voltage steps

down from +12 V to −5 V with the LTM8074. The LT8627SP output

can drive the two 5 V supplies of up to 32 ADMFM2000 devices.

The maximum expected 5 V current on one LT8627SP for the LO

driver supplies is 267 mA per ADMFM2000 device, totaling 8.54 A

for the 32 LO driver inputs. The maximum expected 5 V current

on the second LT8627SP for the LNA supplies is 289 mA per

ADMFM2000 device, totaling 9.25 A for the 32 LO driver inputs.

For the −5 V supply, the voltage steps down from 12 V to −5 V

using the LTM8074. The maximum expected −5 V current is 16 mA

per ADMFM2000 device, totaling 512 mA for the 32 ADMFM2000

devices.

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