HMC981 데이터 시트보기 (PDF) - Analog Devices
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HMC981 Datasheet PDF : 18 Pages
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v00.0611
HMC981
ACTIVE BIAS CONTROLLER
Pad Descriptions
Pad Number
1, 5, 8, 10,
13, 15, 20,
23, 25, 26,
Die Bottom
Function
GND
2
EN
3
SW
Description
These pads and the die bottom must be connected to a
high quality RF/DC ground.
Enable pad. System is enabled when Ven is HIGH (VDIG).
If left floating, Ven defaults to HIGH (enabled).
Internal switch resistance control pad. If left floating, VSW
defaults to HIGH.
12
DISBLSC
Disables short circuit lock down when pulled to ground.
Leave it floating to enable short circuit lock down.
Control voltage of the VG2. Use a resistor divider between
4
VG2CONT
VDD and GND to set the voltage. VG2 is typically 1.3V
lower than the VG2CONT
Interface Schematic
19
VG2
6-7, 29-30
VDD, VDIG
Second gate control.
Bias supply pan. Connect supply voltage
to this pad with appropriate filtering.
9
VREF
1.5V reference voltage. 0.1uF or greater capacitor to GND
is needed for noise filtering.
To adjust the bias current of the external amplifier connect
11
ISENSE
a resistor (Rsense) from ISENSE pad to GND. Use Eqn.2
to
determine the required Rsense value.
7
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