ADL5910ACPZN-R7 datasheet(20/22 Pages) AD

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ADL5910

Data Sheet

Rev. 0 | Page 20 of 22

Figure 24. Evaluation Board Layout

Table 6. Evaluation Board Configuration Options

Component

Function

Notes

Default Values1

RFIN_SW, RFOUT_SW,

R2, R45, R46, R47

RF switch path

To operate the full input protection circuit, route

the input signal through the RFIN_SW and

RFOUT_SW SMA connectors. The values of the

R46, R2, R47, and R45 resistors determine the

coupling factor (20 dB) and insertion loss of the

asymmetrical splitter/coupler.

R2, R46 = 4.99 Ω (0402),

R45 = 62 Ω (0402),

R47 = 220 Ω (0402)

RFIN_ADL5910, R9, R16

RF input

To drive the ADL5910 directly and bypass the

coupler/switch circuit, apply the RF input signal

to the RFIN_ADL5910 SMA. To operate in this

mode, remove R16 and place a 0 Ω resistor on R9.

R9 = open/DNI (0402),

R16 = 0 Ω (0402)

R6, R10 to R14, C2, C4, C5,

L1, L2

Input preemphasis and

termination network

The resistance on R6 combines with the internal

impedance to provide a broad 50 Ω input match.

C2 provides ac coupling between R6 and the RF

inpu.t (The RF input of the ADL5910 is internally

dc-coupled.) A broadband 50 Ω match is achieved

using 82.5 Ω on R6 and a 0.47 µF ac coupling

capacitor on C2. A pre-emphasis network can be

implemented by placing capacitors and inductors

on the pads to the left of R6.

R6 = 82.5 Ω,

R10 = 0 Ω (0402)

R11, R13 = open/DNI (0402),

R12, R14 = 0 Ω (0402),

C2 = 0.47 µF,

C4, C5 = open/DNI (0402),

L1, L2 = open/DNI (0402)

TCAL, R7, R8, VNEXT, VIN−

VCAL threshold calibration

The output voltage from the threshold calibration

pin (VCAL, Pin 3) is available on the yellow TCAL

clip lead. Use the voltage on this pin to determine

the correct threshold voltage that must be applied

to Pin 16 (VIN−) to set a particular RF power

threshold. This process includes two steps. First,

measure the output voltage on the TCAL yellow

clip lead with no RF signal applied to RFIN (this

voltage is approximately 750 mV). Second, apply

the RF input power to RFIN, which causes the

circuit to trip, and again measure the voltage on

the TCAL yellow clip lead. The difference between

these two voltages is equal to the voltage that

must be applied to VIN− during operation. This

voltage can be applied either to the VNEXT SMA

connector or to the VIN− yellow clip lead. This

voltage can also be set by the R8 mechanical

potentiometer on the board.

R7 = 1.1 kΩ (0603),

R8 = 1 kΩ (mechanical

potentiometer)

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