Data Sheet

ADPA7009-2

BIASING THE ADPA7009-2 WITH THE HMC980LP4E

analog.com

Rev. 0 | 21 of 24

Figure 69. Application Circuit Using the HMC980LP4E with the ADPA7009-2 (Internal Negative Voltage Source)

Figure 70. Application Circuit Using the HMC980LP4E with the ADPA7009-2 (External Negative Voltage Source)

HMC980LP4E BIAS SEQUENCE

The DC supply sequence described in this section is required to

prevent damage to the HMC980LP4E when using the device to

control the ADPA7009-2.

Power-Up Sequence

The power-up sequence for the HMC980LP4E is as follows:

1. Set VDIG = 3.3 V.

2. Set S0 = 3.3 V.

3. Set VDD = 5.81 V.

4. Set VNEG = −1.5 V (this step is unnecessary if using an

internally generated voltage).

5. Set EN = 3.3 V (the transition from 0 V to 3.3 V turns on VGATE

and VDRAIN).

Power-Down Sequence

The power-down sequence for the HMC980LP4E is as follows:

1. Set EN = 0 V (the transition from 3.3 V to 0 V turns off VDRAIN

and VGATE).

2. Set VNEG = 0 V (this step is unnecessary if using and internally

generated voltage).

3. Set VDD = 0 V.

4. Set S0 = 0 V.

5. Set VDIG = 0 V.