zlnb2012 Zetex Semiconductors plc., zlnb2012 Datasheet - Page 5

• Manufacturer Part Number: zlnb2012
• Description: Dual Tone And Polarity Switch Lnb Multiplex Controller
• Manufacturer: Zetex Semiconductors plc.

The following diagram shows a typical block diagram
for a twin universal LNB design. The ZLNB2012 device
provides the two polarity and two tone
required to decode the two independent receiver
feeds. The device is also able to detect the absence of a
revceiver connection to either port of the LNB
providing all outputs to go high hence disabling of the
port. This allows the avoidance of unwanted signal
reflections from an unterminated down feed cable.
PROVISIONAL ISSUE A - OCTOBER 2001
ASTRA
10.95 GHz-11.7 GHz
Standard Band
10.7 GHz-11.8 GHz
Enhanced Band
Horizontal
Antenna
Vertical
Antenna
Gain Stage
GaAs/HEMTFET
Gain Stage
GaAs/HEMTFET
Bias Generator
ZNBG40XX
Series
1
2
4
3
High Band
High Band
Low Band
Low Band
Mixer
Mixer
switches
+
+
+
+
Control Input
<=13V-Horizontal
>=14.5V-Vertical
5
Additionally the front end bias requirements of the LNB
are provided by the ZNBG4000 or ZNBG6000 offering a
very efficient and cost effective solution
ZLNB2012 Series
Dual H/V Switch
22kHz Switch
&
High Band
Horizontal
Low Band
Horizontal
High Band
Vertical
Low Band
Vertical
Control
PIN
Diode
MUX
ZLNB2012
IF down feed
950-1750 MHz
- Standard Band
950-2050 MHz
- Enhanced Band
DC Input
13-25V
H/V Output 1
H/V Output 2