Data Sheet

ADL8142

APPLICATIONS INFORMATION

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Rev. B | 17 of 20

The basic connections for operating the ADL8142 over the speci-

fied frequency range are shown in Figure 64. No external biasing

inductor is required, allowing the 2 V supply to be connected

to the VDD pin. It is recommended to use 0.1 µF and 100 pF

power supply decoupling capacitors. The power supply decoupling

capacitors shown in Figure 64 represent the configuration used to

characterize and qualify the ADL8142.

To set IDQ, connect a resistor (R2) between the RBIAS and VDD

pins. A default value of 634 Ω is recommended, which results in

a nominal IDQ of 25 mA. The RBIAS pin also draws a current that

varies with the value of RBIAS, and this current is typically a few mA.

Do not leave the RBIAS pin open.

The RFIN and RFOUT pins are internally ac-coupled. If the RFOUT

pin is connected to a dc bias level other than 0 V, ac-couple this pin

because of the internal dc path to ground on RFOUT.

Figure 64. Typical Application Circuit

RECOMMENDED BIAS SEQUENCING

See the ADL8142-EVALZ user guide for the recommended bias

sequencing information.

Table 8. Recommended Bias Resistor Values for VDD = 2 V

RBIAS (Ω)

IDQ (mA)

IDQ_AMP (mA)

IRBIAS (mA)

203

50

45

5

301

40

36.2

3.8

487

30

27.5

2.5

634

25

23.0

2.0

909

20

18.5

1.5

1500

15

14.1

0.9