HMC981LP3E 데이터 시트보기 (PDF) - Analog Devices

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HMC981LP3E

ACTIVE BIAS CONTROLLER

Analog Devices 

v01.0411

HMC981LP3E

ACTIVE BIAS CONTROLLER

Pin Descriptions (Continued)

Pin Number

Function

Description

Gate Control pin for external amplifier. Connect to the gate

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

11

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.

Interface Schematic

Drain voltage. Should be connected to the supply

12

VDRAIN

terminal of the external amplifier. A minimum 100 nF

capacitor has to be placed close to the external amplifier to

improve load regulation.

13

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

13

TRIGOUT

the active bias system stabilizes. This signal can be

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

HMC981LP3E is used in a daisy chain.

To adjust the bias current of the external amplifier connect

15

ISENSE

a resistor (Rsense) from ISENSE pin to GND. Use Eqn.2 to

determine the required Rsense value.

16

VREF

1.5V reference voltage. 0.1uF or greater capacitor to GND

is needed for noise filtering.

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