ADL5570 データシートの表示（PDF） - Analog Devices

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ADL5570

2.3 GHz to 2.4 GHz WiMAX Power Amplifier

Analog Devices 

ADL5570

EVALUATION BOARD

The evaluation board layout is shown in Figure 16. The ADL5570

performance data was taken on a FR4 board. During board

layout, 50 Ω RF trace impedance must be ensured. The output

matching capacitor, C3, is placed 30 mils from the package edge.

Figure 16. Evaluation Board Layout

Table 6. Evaluation Board Configuration Options

Component

Function

VPOS, VPOS1, GND Supply and Ground Connections.

TP1 (STBY)

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 10 mA.

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. When high, VREG draws a bias current of

approximately 10 mA.

TP5 (MODE), R1

High/Low Power Mode: Switches between high power mode and low power

mode. When MODE is low (0 V), the device operates in high power mode.

When MODE is high (2.5 V), the device operates in low power mode.

L3

Input Interface: L3 matches the input to 50 Ω.

C3, C4

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

C2

C7 to C12

L1, L2, C6, C5

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

node to reduce bias line noise.

Power Supply Decoupling: The capacitors, C7 through C12, are used for power

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

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

on the dc supply lines.

Default Value

W1 = Installed

Not applicable

Not applicable

R1 = 50 kΩ (Size 0402)

L3 = 2.7 nH (Size 0402)

C4 = 39 pF (Size 0402)

C3 = 3.3 pF (Size 0402)

(Tight tolerance recommended)

C2 = 2.2 pF (Size 0402)

C7 to C10 = 0.01 μF (Size 0402)

C11, C12 = 1 μF (Size 0402)

L1 = 1 nH (Size 0402)

C6 = 3.6 pF (Size 0402)

L2 = 11 nH (Size 0402)

C5 = Open

Rev. 0 | Page 10 of 12

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