HMC981 Просмотр технического описания (PDF) - Analog Devices

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HMC981

ACTIVE BIAS CONTROLLER

Analog Devices 

v00.0611

Pad Descriptions (Continued)

Pad Number

Function

Description

HMC981

ACTIVE BIAS CONTROLLER



Interface Schematic

Trigger out signal. Generates a HIGH (3.5V) signal when

14

TRGOUT

the active bias system stabilizes. This signal can be

used to trigger next device (ENABLE) if more than one

HMC981 is used in a daisy chain.

16, 17

VDRAIN

Drain voltage. Should be connected to the supply

terminal of the external amplifier. A minimum 100 nF

capacitor has to be placed close to the external amplifier to

improve load regulation.

Gate Control pad for external amplifier. Connect to the gate

(base) of the external amplifier. In order to guarantee

18

VGATE

stability,a 10μF capacitor should be connected between

the gate (base) terminal of the external amplifier and GND

as close to the amplifier as possible.

Negative input to the chip. Should be supplied with CPOUT

when negative voltage generator is enabled, or connect to

21

VNEG

external VSS when negative voltage generator is enabled.

For detailed usage please refer to the “Negative Voltage

Generator” section.

Feedback (Control) pad for Negative Voltage Generator

22

VNEGFB

Charge Pump. Float to activate the negative voltage

generator / Sort to GND to disable the negative voltage

generator.

Control pad for VGATEFB. Float VGATEFB when a

24

VGATEFB

depletion mode transistor is biased. Selects the mode of

operation along with VNEGFB pad. For detailed usage

please refer to the Table 2.

27, 28

CPOUT

Negative voltage generator charge pump output. Negative

voltage generator needs a flying capacitor, a reservoir

capacitor and two diodes to operate. Please refer to the

application schematic for more info.

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