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.
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
m or e o f t h e i r co n t r o l l i n g r e c e i v e r s p o w e r e d
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.
FEATURES
Dual polarization and tone switch
Temperature compensated polarization switches
Reduced cost solution, only 2 external components
per channel
Multiplexer IC direct drive
Tone and pol. outputs are TTL, CMOS, pin diode and
IF amp capable
Transient resistant inputs
Includes receiver-off detector
User adjustable filter centre frequency and
bandwidth
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 DiSEqCTM tone
bursts.
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.
Low frequency and DiSEqCTM control signals
rejection
Eliminates many close tolerance discrete
components
Wide supply operating range
Low quiescent current
APPLICATIONS
Twin Universal LNB's
Quad Universal LNB's
Multi Feed Universal LNB's
LNB switch boxes
ISSUE 1 - AUGUST 2005
1
DUAL TONE AND POLARITY SWITCH LNB MULTIPLEX CONTROLLER
ZLNB2013
ZLNB2013
ISSUE 1 - AUGUST 2005
2
ABSOLUTE MAXIMUM RATINGS
Supply voltage
-0.6V to 12V
Supply current
500mA
V
POL1
and V
POL2
Input voltage
25V Continous
Operating temperature
-40 to 80C
Storage temperature
-40 to 85C
Power dissipation (T
amb 25 C)
QSOP16
500mW
SYMBOL
PARAMETER
CONDITIONS
LIMITS
UNIT
S
Min.
Typ.
Max.
V
CC
Supply voltage
5
8
V
I
CC
Supply current
HOR1,2= BHOR1,2= TD1,2= BTD1, 2= 0mA
V
POL
1= V
POL
2= Don't Care
F
IN
1= F
IN
2= Don't Care
9
12
mA
V
POL1
and V
POL2
Inputs
I
POL
V
TPOL
V
TENA
T
SPOL
Current
Threshold voltage
Enable threshold
voltage
Switching speed
V
POL1
= V
POL2
= 25V (Note 2)
T
amb
=-40C to 80C
T
amb
=-40C to 80C
100
14
8.0
200
14.75
9.0
240
15.5
10.0
100
A
V
V
S
HOR
OUT
1 and HOR
OUT
2 outputs
VHOR
HIGH
VHOR
LOW
Voltage high
Voltage low
IHOR
OUT
1,2=-100 A,V
POL
1,2=15.5V
IHOR
OUT
1,2=5mA,V
POL
1,2=14V
V
CC
-1.0
0
V
CC
0.7
0.30
V
CC
0.5
V
V
BHOR
OUT
1 and BHOR
OUT
2 outputs
VBHOR
HIG
H
VBHOR
LOW
Voltage high
Voltage low
IBHOR
OUT
1,2=-100 A,V
POL
1,2=14.0V
IBHOR
OUT
1,2=5mA,V
POL
1,2=15.5V
V
CC
-1.0
0
V
CC
0.7
0.30
V
CC
0.5
V
V
Enable 1,2 outputs
VEN
HIGH
VEN
LOW
Voltage high
Voltage low
IEnable 1,2=-100 A,V
POL
1,2=10V
IEnable 1,2=5mA,V
POL
1,2=8.0V
V
CC
-1.0
0
V
CC
0.7
0.30
V
CC
0.5
V
V
Filter amplifier
V
OUT
Bias voltage
3
I
fin
=0
1.75
1.95
2.15
V
F
inz
Input impedance
V
FIN
=100mV p/p
150
AG
Amplifier gain
V
FIN
=100mV p/p
30
V/mA
FV
T
V Threshold
3
100
170
350
mV
p/p
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):
T
amb
= 25 C, V
CC
=5V
Note:
1) The parameters Filter Amplifier VOUT, IOUT, Rectifier VOUT and Comparator Threshold Voltage are all directly
(linearly) related to Vcc.
2) Applied via 2.2k resistors
3) These parameters are linear related to VCC
ISSUE 1 - AUGUST 2005
ZLNB2013
3
SYMBOL
PARAMETER
CONDITIONS
LIMITS
UNITS
Min.
Typ.
Max.
TD 1,2 Outputs
V
VHIGH
V
VLOW
Voltage high
Voltage Low
ITD 1,2=-100 A, Test Circuit 1,
Tone enabled
ITD 1,2=5mA, Test Circuit 1, Tone
disabled
V
CC
-1.0
0
V
CC
-0.7
0.3
V
CC
0.5
V
V
BTD 1,2 Outputs
V
VHIGH
V
VLOW
Voltage high
Voltage Low
IBTD 1,2=-100 A, Test Circuit 1,
Tone disabled
IBTD 1,2=5mA, Test Circuit 1,
Tone enabled
V
CC
-1.0
0
V
CC
-0.7
0.3
V
CC
0.5
V
V
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):
T
amb
= 25 C,V
CC
=5V
Note:
1) The parameters Filter Amplifier VOUT, IOUT, Rectifier VOUT and Comparator Threshold Voltage are all directly
(linearly) related to Vcc.
2) Applied via 2.2k resistors
3) These parameters are linear related to VCC
ZLNB2013
ISSUE 1 - AUGUST 2005
4
TEST CIRCUIT 1 (ZLNB2013 Pinout for QSOP16 package designator - Q16)
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
ISSUE 1 - AUGUST 2005
5
ZLNB2013
Bias Generator
ZNBG Series
ZLNB2013
Dual H/ V Switch
&
22kHz Switch
Vertical
Antenna
Horizontal
Antenna
Gain Stage
GaAs/HEMTFET
Gain Stage
GaAs/HEMTFET
1
4
2
IF down feed
950-1750 MHz
- Standard Band
950-2050 MHz
- Enhanced Band
H/V Output 2
H/V Output 1
3
Control Input
<=13V-Horizontal
>=14.5V-Vertical
Control
High Band
Horizontal
Low Band
Horizontal
High Band
Vertical
Low Band
Vertical
PIN
Diode
MUX
DC Input
13-25V
ASTRA
10.95 GHz-11.7 GHz
Standard Band
10.7 GHz-11.8 GHz
Enhanced Band
+
+
Mixer
+
+
Mixer
Low Band
w
o
L
d
n
a
B
Low Band
High Band
Hd
n
a
B
h
g
i
High Band
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