ADL8113ACCZ-R7 datasheet(35/37 Pages) AD

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Data Sheet

ADL8113

APPLICATIONS INFORMATION

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Rev. 0 | 35 of 37

The basic connections for operating the ADL8113 are shown in

Figure 120. A 5V DC bias is supplied to the amplifier via VDD PA.

The bias current of the amplifier is set by a resistor (R1) connected

between RBIAS and VDD PA. Table 13 details various RBIAS values

vs. IDQ, IDQ_AMP, and IRBIAS for a given 5V DC operation. Do not

leave RBIAS open.

Figure 120. ADL8113 Basic Connections and Evaluation Board Schematic

Table 13. Recommended RBIAS Values at VDD PA Voltage (VDD_PA) = 5V

RBIAS (Ω)

IDQ (mA)

IDQ_AMP (mA)

IRBIAS (mA)

121

130

125

187

120

115

280

110

105

360

100

470

619

787

1050

Power for the two SP4T switches comes from the +3.3V and −3.3V

applied to the VDD_SW and VSS pins, respectively.

The VA and VB digital inputs, signal path states are detailed in

Table 12. A high logic state is between 1.2V and 3.3V, and a low

logic state is between 0.8V and 0V.

Figure 121 shows the time domain response at RFOUT to the

switching voltages on VA and VB when RFIN is driven by a steady

level of approximately 2.5dBm at 250MHz. Both of the external

bypass connection paths (External Bypass A and External Bypass

B) are left open. When VA and VB are low, the ADL8113 is in

internal amplifier mode. When VA and VB are high, the ADL8113

switches to internal bypass mode, and the output drops accordingly.

When VA and VB are nonsimultaneously low or high, the ADL8113

switches to either External Bypass A or External Bypass B because

these two paths are left open; therefore, no signal appears at the

output for both cases.

Figure 121. Time Domain Response of RFOUT to the Switching of the VA and

VB Voltages with a Continuous 2.5dBm RF Input

RECOMMENDED TURN-ON AND TURN-OFF

BIAS SEQUENCING

Turn-On Bias Sequencing

The recommended bias sequence during power-up is as follows:

1. Set VDD_SW = 3.3V.

2. Set VSS = −3.3V.

3. Set VDD PA = 5V.

4. Set VA = 0V or 3.3V.

5. Set VB = 0V or 3.3V.

6. Apply the RF signal.

Turn-Off Bias Sequencing

The recommended bias sequence during power-down is as follows:

1. Turn off the RF signal.

2. Set VB = 0V

3. Set VA = 0V

4. Set VDD PA = 0V.

5. Set VSS = 0V.

6. Set VDD_SW = 0V.

ADL8113ACCZ-R7 数据表(PDF) 35 Page - Analog Devices

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