ADL8122ACPZN-R7 datasheet(23/28 Pages) AD

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Data Sheet

ADL8122

APPLICATIONS INFORMATION

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Rev. 0 | 23 of 28

The basic connections for operating the ADL8122 from 10 MHz to

10 GHz are shown in Figure 94. AC-couple the input and output

of the ADL8122 with appropriately sized capacitors (such as Ameri-

can Technical Ceramics Part Number 560L104YTRN). Connect a

ferrite bead between the VBIAS pin and the RFIN pin to provide

a DC bias voltage to the RF input. A 5 V DC bias is provided

to the amplifier using two ferrite beads connected to the RFOUT/

VDD1 pin. The recommended bias inductor is a TDK Corporation

MMZ1005A222ET000 2.2 kΩ at 100 MHz.

Figure 92. Gain and Return Loss vs. Frequency of 10 MHz to 12 GHz

Application Circuit, 10 kHz to 200 MHz,

VDD = 5 V, IDQ = 95 mA, RBIAS = 620 Ω

The 5 V DC bias voltage must also be connected to the VDD2

pin. The bias conditions, VDD = 5 V and IDQ = 95 mA, are the

recommended operating point to achieve specified performance.

The gain and return loss of this circuit are shown in Figure 92 and

Figure 93 across frequencies. To set other bias conditions, adjust

the RBIAS value. Table 9 shows the recommended RBIAS values and

their associated IDQ values.

Figure 93. Gain and Return Loss vs. Frequency of 10 MHz to 12 GHz

Application Circuit, 200 MHz to 12 GHz,

VDD = 5 V, IDQ = 95 mA, RBIAS = 620 Ω

Figure 94. Typical Application Circuit for Operation from 10 MHz to 10 GHz

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