ADL8124ACPZN-R7 datasheet(26/29 Pages) AD

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Data Sheet

ADL8124

APPLICATIONS INFORMATION

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Rev. 0 | 26 of 29

The basic connections for operating the ADL8124 over the speci-

fied frequency range are shown in Figure 100 . No external biasing

inductor is required, which allows the 3.3V supply to be connected

to the VDD pin. Alternatively, 5V supply operation is also supported.

It is recommended to use 100pF power-supply decoupling capaci-

tor. The power-supply decoupling capacitor shown in Figure 100

represents the configuration used to characterize and qualify the

ADL8124.

To set IDQ, connect a resistor (R3) between the RBIAS and VDD

pins. A default value of 1540Ω is recommended, which results in

a nominal IDQ of 55mA. Table 12 shows how IDQ and IDQ_AMP vary

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

RBIAS value (see Table 12). Do not leave the RBIAS pin open.

The VTEMP pin provides an output voltage that is proportional to

the die temperature. The VTEMP pin has a high output resistance

that must be buffered using an op amp. The temperature sensor is

internally supplied through the VDD pin.

The VENBL pin provides a convenient method to power up or

power down the ADL8124. To enable the amplifier, connect the

VENBL pin to a supply. To disable the amplifier, connect the VENBL

pin to ground.

Figure 100. Typical Application Circuit

ADL8124ACPZN-R7 Fiches technique(PDF) 26 Page - Analog Devices