Data Sheet

ADL8142

RECOMMENDED POWER MANAGEMENT CIRCUIT

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Rev. B | 19 of 20

Figure 67 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 ADL8142 is being

used in a large array, a single LT3083 can easily provide power to

the low noise amplifiers in a 64-element array. For applications that

require a lower dropout voltage, LT3033 can be used.

Table 9 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 9. Recommended Resistor Values for the Various LDO Output Voltages

LDO VOUT (V)

R1 (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

Figure 67. Recommended Power Management Circuit