Diodes ZNBG3118 - Manual

ZNBG3118
ZNBG3118
Document number: DS32049 Rev. 2 - 2
1 of 10
www.diodes.com
February 2010
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LNA GaAs FET BIAS CONTROLLER WITH POLARIZATION AND BAND SELECT
Summary
The ZNBG3118 is a bias and control solution designed for Satellite Low Noise Blocks (LNB’s). Providing three bias stages to
power control and protect the GaAs or HEMT FET low noise amplifier’s (LNA’s). The ZNBG3118 integrates an accurate voltage
detector to select the LNB polarisation channel and an advanced tone detector to select the local oscillator (LO) for band
switching.
Features
•
Provides bias for up to three GaAs and HEMT FETs
•
Dynamic FET protection and temperature compensation
•
Drain current set by external resistor
•
Regulated negative rail generator requires only 2 external
capacitors
•
Accurate voltage detector and polarisation switch for
LNB’s
•
22kHz tone detection for band switching with rejection of
unwanted signals
•
Band switch supports both Discrete, MIMIC and PLL
local oscillators
•
Compliant with ASTRA control specifications
•
Low current for power efficient systems
•
Wide operating supply range of 3.3V to 8V
Pin Assignments
Application
• Single
Output LNB’s
•
Two single type twin LNB’s
•
Low power LNB’s
•
PLL Single LNB’s
Single Universal LNB System Diagram
Top View
Bottom View
GND
C
NB1
C
NB2
LB G1
G3
V
CC
L
OV
HB
D3 D12 G2
F
IN
V
PO
L
R
CAL
C
SU
B
C
SUB