DIODES ZLNB2012

ZLNB2012
DUAL TONE AND POLARITY SWITCH
LNB MULTIPLEX CONTROLLER
DEVICE DESCRIPTION
The ZLNB2012 dual polarisation 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 polarisation selection,
local oscillator selection and downfeed 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 polarisation control voltage. To facilitate this
function, the ZLNB2012 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 give excellent
rejection of low frequency control signals and
DiSEqC™ tone bursts.
The two highly accurate polarisation control inputs of
the ZLNB2012 have a nominal threshold of 14.25V and
to meet the required demanding needs from some
broadcasters they have a switching range of 14.0V to
14.5V. The threshold is temperature compensated to
minimise drift. Each features a low and stable input
current that enables transient protection to be
achieved with the addition of only a single resistor per
channel.
The ZLNB2012 has been specifically designed to
minimise the solution cost whilst being flexible. The
ZLNB2012 only requires two external components per
channel to give full user control and functionality. The
ZLNB2012 also includes complimentary outputs so
that it can directly drive many multiplexer IC’s without
the need of an inverter. Any unused outputs can be left
open circuit without any effect to the remaining circuits
operation Polarisation switch and tone detector
outputs can directly drive TTL and CMOS logic, pin
diodes, IF-amp supply switching and multiplexer IC’s.
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
polarisation input of the ZLNB2012 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 downfeed
driver, eliminating any problems due to cable
mismatch.
The ZLNB2012 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
rejection
· Dual polarisation and tone switch
· Reduced Cost Solution, only 2 external components
per channel
control signals
· E l i m i n a t e s m a n y cl o se t o l e r a n ce d i scr e t e
components
· Close tolerance (14-14.5V) and temperature
compensated polarisation switch
· 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
PROVISIONAL ISSUE A - OCTOBER 2001
1
ZLNB2012
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
Min
V CC
Supply Voltage
I CC
Supply Current
UNITS
LIMITS
Typ
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
Max
8
V
9
12
mA
200
14.25
240
14.5
100
␮A
V
␮S
V POL1 and VPOL2 Inputs
I POL
V TPOL
T SPOL
V POL1 = VPOL2 = 25V (Note 2)
Current
Threshold Voltage T amb =-40°C to 80°C
Switching Speed
VHOR HIGH
VHOR LOW
Voltage High
Voltage Low
100
14
HOR OUT 1 and HOR OUT 2 Outputs
IHOR OUT 1,2=-100␮A,V POL 1,2=14.5V
IHOR OUT 1,2=5mA,V POL 1,2=14V
V CC -1.0 VCC 0.7 V CC
0
0.30
0.5
V
V
IBHOR OUT 1,2=-100␮A,V POL 1,2=14.0V
IBHOR OUT 1,2=5mA,V POL 1,2=14.5V
V CC -1.0 VCC 0.7 V CC
0
0.30
0.5
V
V
IEnable 1,2=-100␮A,V POL 1,2=10V
IEnable 1,2=500␮A,V POL 1,2=8.0V
V CC -1.0 V CC 0.7 V CC
0
0.30
0.5
V
V
1.75
BHOR OUT 1 and BHOR OUT 2 Outputs
VBHOR HIGH Voltage High
VBHOR LOW Voltage Low
Enable 1,2
Outputs
VEN HIGH
VEN LOW
Voltage High
Voltage Low
Filter Amplifier
V OUT
Bias Voltage 3
I fin =0
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
1.95
170
2.15
350
V
mV
p/p
Note:1) The parameters Filter Amplifier VOUT, IOUT, Rectifier VOUT and Comparator Threshold Voltage are all directly (linearly)
related to Vcc.
2) Applied via 1k resistors
3) These parameters are linear related to VCC
PROVISIONAL ISSUE A - OCTOBER 2001
2
ZLNB2012
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 CC -1.0 V CC -0.7
V CC
V
V VLOW
Voltage Low
ITD 1,2=15mA, Test Circuit 1,
Tone disabled
0
0.5
V
0.3
BTD 1,2 Outputs
V VHIGH
Voltage high
IBTD 1,2=-100␮A, Test Circuit 1,
Tone disabled
V CC -1.0 V CC -0.7
V CC
V
V VLOW
Voltage Low
IBTD 1,2=15mA, Test Circuit 1,
Tone enabled
0
0.5
V
0.3
Note:1) The parameters Filter Amplifier VOUT, IOUT, Rectifier VOUT and Comparator Threshold Voltage are all directly (linearly)
related to Vcc.
2) Applied via 1k resistors
3) These parameters are linear related to VCC
PROVISIONAL ISSUE A - OCTOBER 2001
3
ZLNB2012
TEST CIRCUIT 1 (ZLNB2012 Pinout for QSOP16 package designator - Q16)
BTD2
10nF
CF2
1
BTD1
TD2
TD1
BHOR2
BHOR1
HOR2
HOR1
ENA2
VCC
GND
ENA1
FIN2
FIN1
VPOL2
VPOL1
V1
5V
10nF
CF1
RP2
1.0k
RP1
1.0k
V2
(See Note 1)
Note 1: V2 Characteristics
Type:AC source
Frequency:- 22kHz
Voltage:300mVp/p Enabled
Zero Disabled
Tone Input (V2)
TD Outputs
Switching Delays
PROVISIONAL ISSUE A - OCTOBER 2001
4
ZLNB2012
Additionally the front end bias requirements of the LNB
are provided by the ZNBG4000 or ZNBG6000 offering a
very efficient and cost effective solution
The following diagram shows a typical block diagram
for a twin universal LNB design. The ZLNB2012 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
ZNBG40XX
Series
ZLNB2012 Series
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
PROVISIONAL ISSUE A - OCTOBER 2001
5
H/V Output 2
ZLNB2012
APPLICATION CIRCUIT EXAMPLES
The following circuit shows the additional components that will be used for polarisation mode and 22kHz tone
detection in typical ZLNB2012 application (ZLNB2012 Pinout for QSOP16 package designator - Q16).
BTD2
RP2
1.0k
10nF
CF2
1
BTD1
TD2
TD1
BHOR2
BHOR1
HOR2
HOR1
ENA2
VCC
GND
ENA1
FIN2
FIN1
VPOL2
VPOL1
Vcc
10nF
CF1
RP1
1.0k
LNB Downfeed No.2
LNB Downfeed No.1
ORDERING INFORMATION
ZLNB2012 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
ZLNB2012Q16
QSOP16
ZLNB2012
SAMPLE ORDERING INFORMATION
Part Number
Package
Part Mark
#ZLNB2012Q16
QSOP16
ZLNB2012
PROVISIONAL ISSUE A - OCTOBER 2001
6
ZLNB2012
FURTHER INFORMATION
Inputs Vpol1 and Vpol2 are designed to be wired to the
power inputs of an LNB via a high value (1K) 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 14.5V 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
ZLNB2012 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 ZLNB2012 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 ZLNB2012 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
⭓14.5V
Low
High
High
Low
High
On
⭐14V
High
Low
Low
High
High
On
⭓14.5V
High
Low
High
Low
High
-
<8V
-
-
Low
High
Low
PROVISIONAL ISSUE A - OCTOBER 2001
7
ZLNB2012
PACKAGE DIMENSIONS
QSOP16
DIM
A
Millimetres
Inches
MIN
MAX
MIN
MAX
4.80
4.98
0.189
0.196
B
0.635
0.025 NOM
C
0.23 REF
0.009 REF
D
0.20
0.30
0.008
0.012
E
3.81
3.99
0.15
0.157
F
1.35
1.75
0.053
0.069
G
0.10
0.25
0.004
0.01
J
5.79
6.20
0.228
0.244
K
0°
8°
0°
8°
© Zetex plc 2001
Zetex plc
Fields New Road
Chadderton
Oldham, OL9 8NP
United Kingdom
Telephone (44) 161 622 4422
Fax: (44) 161 622 4420
Zetex GmbH
Streitfeldstraße 19
D-81673 München
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Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
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Telephone: (631) 360 2222
Fax: (631) 360 8222
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Hing Fong Road
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Telephone: (852) 26100 611
Fax: (852) 24250 494
These offices are supported by agents and distributors in major countries world-wide.
This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or
reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services
concerned. The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or
service.
For the latest product information, log on to www.zetex.com
PROVISIONAL ISSUE A - OCTOBER 2001
8