ADL8107ACPZN-R7 datasheet(20/23 Pages) AD

20 / 23 page

Data Sheet

ADL8107

APPLICATIONS INFORMATION

analog.com

Rev. B | 20 of 23

The basic connections for operating the ADL8107 over the speci-

fied frequency range are shown in Figure 79. No external biasing

inductor is required, allowing the 5 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 79 represent the configuration used to

characterize and qualify the ADL8107.

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

pins. A default value of 4.12 kΩ is recommended, which results in

a nominal IDQ of 90 mA. Table 9 shows how the IDQ and IDQ_AMP

varies vs. the RBIAS. The RBIAS pin also draws a current that

varies with the value of RBIAS (see Table 9). Do not leave the

RBIAS pin open.

Correct sequencing of the dc and RF power is required to safely

operate the ADL8107. During power up, apply VDD before the RF

power is applied to RFIN, and during power off, remove the RF

power from RFIN before VDD is powered off.

Figure 79. Typical Application Circuit

RECOMMENDED BIAS SEQUENCING

See the ADL8107-EVALZ user guide for the recommended bias

sequencing information.

Table 9. Recommended Bias Resistor Values for VDD = 5 V

RBIAS (kΩ)

IDQ (mA)

IDQ_AMP (mA)

IRBIAS (mA)

1.74

110

108.06

1.94

2.13

105

103.34

1.66

2.67

100

98.61

1.39

3.32

93.84

1.16

4.12

89.0

1.0

5.11

84.2

0.8

6.57

79.36

0.64

8.45

74.5

0.5

11.3

69.6

0.4

64.7

0.3

20.8

59.78

0.22

29.8

54.85

0.15

49.91

0.09

64.9

44.93

0.07

102

39.95

0.05

169

34.97

0.03

301

29.98

0.02

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