ZLNB2013

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.
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.
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 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
• Low frequency and DiSEqC™ control signals
rejection
• Dual polarization and tone switch
• Temperature compensated polarization switches
• Eliminates many close tolerance discrete
components
• Reduced cost solution, only 2 external components
per channel
• Wide supply operating range
• Multiplexer IC direct drive
• Low quiescent current
• Tone and pol. outputs are TTL, CMOS, pin diode and
IF amp capable
APPLICATIONS
• Twin Universal LNB’s
• Transient resistant inputs
• Quad Universal LNB’s
• Includes receiver-off detector
• Multi Feed Universal LNB’s
• User adjustable filter centre frequency and
bandwidth
• LNB switch boxes
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ZLNB2013
ABSOLUTE MAXIMUM RATINGS
Supply voltage
-0.6V to 12V
Supply current
500mA
Power dissipation (Tamb 25 C)
QSOP16
500mW
VPOL1 and VPOL2
Input voltage
25V Continous
Operating temperature
-40 to 80°C
Storage temperature
-40 to 85°C
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):
Tamb= 25⬚C, VCC=5V
SYMBOL
PARAMETER
CONDITIONS
LIMITS
Min.
V CC
Supply voltage
I CC
Supply current
UNIT
S
Typ.
Max.
8
V
9
12
mA
100
14
8.0
200
14.75
9.0
240
15.5
10.0
100
␮A
V
V
␮S
VCC-1.0
0
VCC 0.7
0.30
VCC
V
0.5
V
IBHOR OUT 1,2=-100␮A,V POL 1,2=14.0V
IBHOR OUT 1,2=5mA,V POL 1,2=15.5V
VCC-1.0
0
VCC 0.7
0.30
VCC
V
0.5
V
IEnable 1,2=-100␮A,V POL 1,2=10V
IEnable 1,2=5mA,V POL 1,2=8.0V
VCC-1.0 VCC 0.7
0
0.30
VCC
V
V
5
HOR1,2= BHOR1,2= TD1,2= BTD1, 2= 0mA
VPOL 1= VPOL 2= Don’t Care
F IN 1= F IN 2= Don’t Care
V POL1 and VPOL2 Inputs
I POL
V TPOL
V TENA
T SPOL
Current
Threshold voltage
Enable threshold
voltage
Switching speed
V POL1 = VPOL2 = 25V (Note 2)
T amb =-40°C to 80°C
T amb =-40°C to 80°C
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
BHOR OUT 1 and BHOR OUT 2 outputs
VBHOR HIG
H
VBHOR LOW
Voltage high
Voltage low
Enable 1,2 outputs
VEN HIGH
VEN LOW
Voltage high
Voltage low
0.5
Filter amplifier
V OUT
Bias voltage 3
I fin =0
F inz
Input impedance
V FIN =100mV p/p
AG
Amplifier gain
V FIN =100mV p/p
FV T
V Threshold
1.75
1.95
2.15
30
3
100
170
V
⍀
150
V/mA
350
mV
p/p
Note:
1) The parameters Filter Amplifier V OUT, 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 V CC
ISSUE 1 - AUGUST 2005
2
ZLNB2013
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):
Tamb= 25⬚C,VCC=5V
SYMBOL
PARAMETER
CONDITIONS
UNITS
LIMITS
Min.
Typ.
Max.
TD 1,2 Outputs
V VHIGH
Voltage high
ITD 1,2=-100␮A, Test Circuit 1,
Tone enabled
V VLOW
Voltage Low
ITD 1,2=5mA, Test Circuit 1, Tone
disabled
V CC -1.0 V CC -0.7
0
0.3
V CC
V
0.5
V
V CC
V
0.5
V
BTD 1,2 Outputs
V VHIGH
Voltage high
IBTD 1,2=-100␮A, Test Circuit 1,
Tone disabled
V VLOW
Voltage Low
IBTD 1,2=5mA, Test Circuit 1,
Tone enabled
V CC -1.0 V CC -0.7
0
Note:
1) The parameters Filter Amplifier V OUT, 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 V CC
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0.3
ZLNB2013
TEST CIRCUIT 1 (ZLNB2013 Pinout for QSOP16 package designator - Q16)
ISSUE 1 - AUGUST 2005
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ZLNB2013
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
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.
Horizontal Gain Stage
GaAs/HEMTFET
Antenna
1
3
High Band
Control Input
<=13V-Horizontal
>=14.5V-Vertical
+
DC Input
13-25V
High Band
Horizontal
Mixer
Low Band
Horizontal
+
H/V Output 1
Bias Generator
ZNBG Series
ZLNB2013
Dual H/ V Switch
&
22kHz Switch
High Band
ASTRA
10.95 GHz-11.7 GHz
Standard Band
10.7 GHz-11.8 GHz
Enhanced Band
Low Band
Low Band
Control
PIN
Diode
MUX
IF down feed
950-1750 MHz
- Standard Band
950-2050 MHz
- Enhanced Band
High Band
+
2
Vertical
Antenna
4
Gain Stage
GaAs/HEMTFET
High Band
Vertical
Mixer
Low Band
Vertical
+
Low Band
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H/V Output 2
ZLNB2013
APPLICATION CIRCUIT EXAMPLES
The following circuit shows the additional components that will be used for polarisation mode and 22kHz tone
detection in typical ZLNB2013 application (ZLNB2013 Pinout for QSOP16 package designator - Q16).
ORDERING INFORMATION
ZLNB2013 PINOUT FOR QSOP16
PACKAGE DESIGNATOR - Q16
1
BTD2
BTD1
TD2
TD1
BHOR2
BHOR1
HOR2
HOR1
ENA2
VCC
GND
ENA1
FIN2
FIN1
VPOL2
VPOL1
Part number
Package
Part mark
ZLNB2013Q16
QSOP16
ZLNB2013
SAMPLE ORDERING INFORMATION
Part number
Package
Part mark
#ZLNB2013Q16
QSOP16
ZLNB2013
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ZLNB2013
FURTHER INFORMATION
Inputs Vpol1 and Vpol2 are designed to be wired to the
power inputs of an LNB via a high value (2.2k) resistors.
Input Vpol1 controls outputs HOR1, BHOR1 and ENA1.
Input Vpol2 controls outputs HOR2, BHOR2 and ENA2.
With either input voltage set at or below 14V, the
corresponding HOR pin will be active and the
corresponding BHOR pin will be the inverse of HOR.
With either input voltage at 15.5V or higher, the
corresponding HOR pin will be active and the
corresponding BHOR pin will be the inverse. Should
the voltage applied to either Vpol input fall below 8V,
the corresponding ENA (enable) pin will be low,
otherwise these outputs will remain high. Any input or
output may be left open circuit without any effect on
the remaining circuitry.
The RC network components also serve two other
purposes. The resistor provides overvoltage protection
for the Vpol pin and the capacitor minimises tone
interference of the Vpol threshold. The upper
frequency roll-off of the op-amp has been set internally
at above 100kHz to allow the amplifier to be used with
other common tone switch frequencies.
The rectifier/smoother/comparitor function is provided
by a complex propriety circuit that allows the
ZLNB2013 to reliably detect wanted tones whilst
ignoring low frequency square wave switch box
signals, DiSEqC™ bursts and supply switching
transients common when using DiSEqC-2™ ready
set-top boxes. This is all achieved without the need for
any further external components. The threshold of the
comparitor is supply dependent, hence the gain of the
preceding op-amp must be adjusted in line with supply
voltage.
The ZLNB2013 includes all the circuitry necessary to
detect the presence of a 22kHz tone modulated on the
supply input to the LNB. The main elements of the
detector are an op-amp, a rectifier/smoother and a
comparitor. The op-amp has a pre-set internal
feedback resistor so that just a simple RC network
wired to the input gives user defined gain and low
frequency cut filter characteristics.
Output truth table
The ZLNB2013 includes two independent channels, each containing a voltage detector and tone detector. The
following truth table applies to each channel:-
Tone
Vpol
TD
BTD
HOR
BHOR
ENA
Off
⭐14V
Low
High
Low
High
High
Off
⭓15.5V
Low
High
High
Low
High
On
⭐14V
High
Low
Low
High
High
On
⭓15.5V
High
Low
High
Low
High
-
<8V
-
-
Low
High
Low
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ZLNB2013
QSOP16
D
⍜
ZD
E
E1
0.120”
max.
h x 45°
L
Pin 1
c
0.080” max.
A2
b
A
A1
e
PACKAGE DIMENSIONS
Dim.
Millimeters
Min.
Max.
Inches
Min.
Dim.
Max.
Millimeters
Inches
Min.
Max.
Min.
Max.
0.41
1.27
0.016
0.050
A
1.35
1.75
0.053
0.069
L
A1
0.10
0.25
0.004
0.010
e
A2
1.25
1.50
0.049
0.059
b
0.20
0.30
0.008
0.012
D
4.80
5.00
0.189
0.197
c
0.18
0.25
0.007
0.010
0.64 BSC.
0.025 BSC.
⍜
0°
8°
0°
8°
E
5.79
6.20
0.228
0.244
h
0.25
0.50
0.010
0.020
E1
3.81
3.99
0.150
0.157
-
-
-
-
-
ZD
0.23 REF.
0.009 REF.
© Zetex Semiconductors plc 2005
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United Kingdom
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For the latest product information, log on to www.zetex.com
ISSUE 1 - AUGUST 2005
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