Data Sheet

ADL8141

RECOMMENDED POWER MANAGEMENT CIRCUIT

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Rev. 0 | 21 of 22

Figure 75 shows a recommended power management circuit that

uses the LT3083 low dropout (LDO) regulator. With the IN and

VCONTROL pins tied together, the minimum input voltage (VIN) is 3.6

V when an output voltage (VOUT) of 2 V is required along with a

current draw of up to 3 A. Assuming that the ADL8141 is used in

a large array, a single LT3083 can easily provide power to the low

noise amplifier in a 64-element array.

Table 10 provides recommended resistor values to set the other

VDD voltages. In each case, the minimum external supply is the

minimum dropout voltage from the VCONTROL input to VOUT.

Table 10. Recommended Resistor Values for the Various LDO Output Voltages

LDO VOUT (V)

R2 (kΩ)

Minimum VDD (V)

1.5

30.1

3.1

2

40.2

3.6

2.5

49.9

4.1

3.3

66.5

4.9

4

80.6

5.6

Figure 75. Recommended Power Management Circuit