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PDF ZLNB2013 Data sheet ( Hoja de datos )
| Número de pieza | ZLNB2013 | |
| Descripción | DUAL TONE AND POLARITY SWITCH LNB MULTIPLEX CONTROLLER | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
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ZLNB2013
DUAL TONE AND POLARITY SWITCH LNB MULTIPLEX CONTROLLER
DESCRIPTION
The ZLNB2013 dual polarization and tone switch
controller is one of a wide range of satellite receiver
LNB support circuits available from Zetex. It features
two completely independent channels, each providing
logic outputs to control LNB polarization selection,
local oscillator selection and down feed disable. It is
intended for use in Twin, Quad and multiple feed
Universal LNBs, replacing many discrete components
to save both manufacturing cost and PCB size, whilst
improving reliability.
Universal LNB local oscillator selection is achieved by
detection of a low level AC voltage superimposed on
the polarization control voltage. To facilitate this
function, the ZLNB2013 includes a separate tone
detector for each channel. Control of detector
bandwidth and sensitivity is provided using an external
resistor and capacitor for each channel. The tone
detector has been designed to give excellent rejection
of low frequency control signals and DiSEqC™ tone
bursts.
The two polarization control inputs of the ZLNB2013
have a threshold voltage of 14.75V to meet the
switching requirement of 14.0V to 15.5V. To minimize
drift both thresholds are temperature compensated.
Each features a low and stable input current that
enables threshold trimming and transient protection to
be achieved with the addition of only a single resistor
per channel.
Multi feed LNBs can be called to operate with one or
more of their controlling receivers powered
down/disconnected, with attendant cable mismatch
problems. To ease design for this situation, each
polarization input of the ZLNB2013 has a second
threshold set at 9V. An input voltage below this
threshold indicates “receiver not present” and
switches the relevant control channels high. This logic
output can be used to disable the associated down feed
driver, eliminating any problems due to cable
mismatch.
The ZLNB2013 has been specifically designed to
minimize the solution cost whilst being flexible. The
ZLNB2013 only requires two external components per
channel to give full user control and functionality. The
ZLNB2013 also includes complimentary outputs so
that it can directly drive many multiplexer ICs without
the need of an inverter. Any unused outputs can be left
open circuit without any effect to the remaining
circuits. Polarization switch and tone detector outputs
can directly drive TTL and CMOS logic, pin diodes,
IF-amp supply switching and multiplexer ICs.
The ZLNB2013 operates from a single supply which can
be anything from 5-8V. Its quiescent current is typically
only 9mA and this does not change significantly with
load or logic state. It is available in the space saving
QSOP16 surface mount package.
FEATURES
• Dual polarization and tone switch
• Temperature compensated polarization switches
• Reduced cost solution, only 2 external components
per channel
• Low frequency and DiSEqC™ control signals
rejection
• Eliminates many close tolerance discrete
components
• Wide supply operating range
• Multiplexer IC direct drive
• Low quiescent current
• Tone and pol. outputs are TTL, CMOS, pin diode and
IF amp capable
• Transient resistant inputs
APPLICATIONS
• Twin Universal LNB’s
• Includes receiver-off detector
• User adjustable filter centre frequency and
bandwidth
• Quad Universal LNB’s
• Multi Feed Universal LNB’s
• LNB switch boxes
ISSUE 1 - AUGUST 2005
1
1 page  
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ZLNB2013
The following diagram shows a typical block diagram
for a twin universal LNB design. The ZLNB2013 device
provides the two polarity and two tone switches
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.
Additionally the front end bias requirements of the LNB
are provided by the ZNBG fixed bias range offering a
very efficient and cost effective solution
Horizontal Gain Stage
Antenna GaAs/HEMTFET
13
ASTRA
10.95 GHz-11.7 GHz
Standard Band
10.7 GHz-11.8 GHz
Enhanced Band
Bias Generator
ZNBG Series
Control Input
<=13V-Horizontal
High Band >=14.5V-Vertical
+
Mixer
+
Low Band
High Band
Horizontal
Low Band
Horizontal
ZLNB2013
Dual H/ V Switch
&
22kHz Switch
Control
PIN
Diode
MUX
DC Input
13-25V
H/V Output 1
IF down feed
950-1750 MHz
- Standard Band
950-2050 MHz
- Enhanced Band
24
Vertical Gain Stage
Antenna GaAs/HEMTFET
High Band
+
Mixer
+
Low Band
High Band
Vertical
Low Band
Vertical
H/V Output 2
ISSUE 1 - AUGUST 2005
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ZLNB2013.PDF ] | |
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