HMC1126ACEZ-R7 datasheet(16/21 Pages) AD

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HMC1126ACEZ

Data Sheet

Rev. 0 | Page 16 of 21

APPLICATIONS INFORMATION

Figure 57 shows the basic connections for operating the

HMC1126ACEZ. Because the RFIN and RFOUT pins are

internally ac-coupled, no external ac coupling is required.

Because VDD, VGG1, and VGG2 are internally decoupled, no

external components are required on these pins. Figure 57 shows

the configuration used to characterize and qualify the device.

See the HMC1126-EVALZ user guide for information on using

the evaluation board.

POWER-UP AND POWER-DOWN SEQUENCING

To avoid damaging the device, careful attention must be paid to

the power-up and power-down sequencing of the RF input, the

gate bias voltages, and the drain bias voltage.

Power-Up

The following power-up sequencing is recommended:

1. Connect GND to ground.

2. Set VGG1 to −2 V.

3. Set VDD to 5 V.

4. Set VGG2 to 1 V.

5. Increase VGG1 to achieve an IDQ = 85 mA.

6. Apply the RF signal.

Power-Down

The following power-down sequencing is recommended:

1. Turn off the RF signal.

2. Decrease VGG1 to −2 V to achieve an IDQ = 0 mA.

3. Decrease VGG2 to 0 V.

4. Decrease VDD to 0 V.

5. Increase VGG1 to 0 V.

GND

RFIN

GND

RFOUT

VGG1

(–2V TO 0V)

VGG2

(1V)

VDD

(5V)

GND

Figure 57. Basic Connections

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