ADL5571

Rev. 0 | Page 13 of 16

EVALUATION BOARD

The ADL5571 performance data was taken on a FR4 board

layout. Care should be taken to ensure 50 Ω impedance for

all RF traces. For optimal performance in linearity, gain, and

efficiency, the output matching capacitor, C3, should be placed

35 mils from the edge of the package.

Figure 25. Evaluation Board Top Layer

Figure 26. Evaluation Board Bottom Layer

Table 6. Evaluation Board Configuration Options

Component

Function

Default Value

VPOS, VPOS1, GND

Supply and Ground Connections.

W1 = installed

TP1 (STBY/PWDN)

Transmit/Standby Mode. When STBY is low (0 V), the device operates in transmit mode.

When the radio is receiving data, STBY can be taken high (2.5 V), reducing the supply

current to 9 mA.

Not applicable

TP2 (VREG)

Normal/Sleep Mode. When VREG is low, the device goes into sleep mode, reducing

the supply current to 10 μA. When VREG is high (2.85 V), the device operates in its

normal transmit mode and the VREG pin draws a bias current of approximately 9 mA.

Not applicable

L3

Input Interface. L3 matches the input to 50 Ω.

L3 = 2.7 nH (Size 0402)

C3, C4

Output Interface. C4 provides dc blocking. C3 matches the output to 50 Ω.

C3 = 2.7 pF (Size 0402)

(C3 value for 2.5 GHz to

2.7 GHz operation, tight

tolerance recommended)

C4 = 39 pF (Size 0402)

C2, C10

Filter Interface. A ground-referenced capacitor should be connected to this node to

reduce bias line noise.

C2 = 2.2 pF (Size 0402)

C10 = 0.01 μF (Size 0402)

C7, C8, C9, C11, C12

Power Supply Decoupling. Capacitors C7 through C12 are used for power supply

decoupling. They should be placed as close as possible to the DUT.

C7 = 0.01 μF (Size 0402)

C8 = 0.01 μF (Size 0402)

C9 = 0.01 μF (Size 0402)

C11 = 1 μF (Size 0402)

C12 = 1 μF (Size 0402)

L1, C6, L2, C5

RF Trap. L1, C6 and L2, C5 form tank circuits and prevent RF from propagating on

the dc supply lines

L1 = 1 nH (Size 0402)

C6 = 3.3 pF (Size 0402)

L2 = 11 nH (Size 0402)

C5 = Open

RFIN, RFOUT

RF Input and Output SMA Connections.