Zetex ZLNB2001Q16, ZLNB2002Q16, ZLNB2003Q16, ZLNB2004Q16 Datasheet
DUAL TONE and POLARITY SWITCH LNB
MULTIPLEX CONTROLLER
ISSUE 1- NOVEMBER 1998
DEVICE DESCRIPTION
The ZLNB200X 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 Universal LNBs,
replacing many discrete components to save
both manufacturing cost and PCB size whilst
improving reliability.
The two polarisation control inputs of the
ZLNB200X have a nominal threshold of
14.75V. 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.
Twin Universal LNBs can be called to
operate with one of their controlling
receivers powered down/disconnected, with
attendant cable mismatch problems. To
ease design for this situation, each
polarisation input of the ZLNB200X has a
second threshold set at 9.5V. An input
voltage below this threshold indicates
"receiver not present", switching the
channels Enable pin low. This logic output
can be used to disable the associated
downfeed driver, eliminating any problems
due to cable mismatch.
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 ZLNB200X includes a separate tone
detector for each channel. Full control of
detector bandwidth and sensitivity is
provided using two external resistors and
capacitors. In the ZLNB2003/4, additional
control of tone switch delays is provided to
assist with the rejection of low frequency
control signals intended for other systems.
Polarisation switch and tone detector
outputs can source and sink 10mA making
them suitable to drive TTL and CMOS logic,
pin diodes and for IF-amp supply switching.
The ZLNB200X operates from a single
supply which can be anything from 5-10V. Its
quiescent current is typically only 6mA and
this does not change significantly with load
or logic state. It is available in the space
saving QSOP16 surface mount package.
ZLNB2001 ZLNB2002
ZLNB2003 ZLNB2004
FEATURES
Dual polarisation switch
•
Temperature compensated polarisation
•
switch threshold
Transient resistant inputs
•
Includes Receiver-Off detector
•
Dual tone switch
•
User adjustable filter centre frequency
•
and bandwidth
User adjustable tone switching delays
•
(ZLNB2003/4 only)
Tone and pol. outputs TTL, CMOS, Pin
•
diode and IF amp capable
Receiver-Off detector TTL and CMOS
•
compatible
Wide supply operating range
•
Low quiescent current
•
Few external components
•
Eliminates many discrete components
•
APPLICATIONS
Twin Universal LNB
•
Twin Universal IF switch boxes
•
LNB switch boxes
•
81
ZLNB2001 ZLNB2002
ZLNB2003 ZLNB2004
ABSOLUTE MAXIMUM RATINGS
Supply Voltage -0.6V to 12V
Power Dissipation (T
QSOP16 500mW
amb
= 25°C)
Supply Current 100mA
V
and V
POL1
Input Voltage 25V Continuous
POL2
Operating Temperature -40 to 70°C
Storage Temperature -40 to 85°
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):
= 25°C,VCC=5V,ID=10mA (R
T
amb
SYMBOL PARAMETER CONDITIONS
V
I
I
V
CC
CC
POL
TPOL
Supply Voltage 5 10 V
Supply Current IHV
IT
V
V
POL1
and V
POL2
Inputs
Current V
Threshold
T
=IT
out1,2
=0,IHV
out1,2
=15.5V
POL
= V
POL1
=-40°C to 70°C (Note 2) 14.0 14.75 15.5 V
amb
Voltage
T
SPOL
Switching
Speed
VHV
VHV
VHV
IHV
Voltage High
HIGH
Voltage High
HIGH
Voltage Low
LOW
out1
and IHV
Outputs
out2
out1,2
=-20µA,V
IHV
IHVout1,2=-10µA,V
out1,2
=-10µA,V
IHV
Enable 1,2
Outputs
VEN
VEN
VEN
Voltage High
HIGH
Voltage High
HIGH
Voltage Low
LOW
IEnable1,2=-100µA,V
IEnable1,2=20µA,V
IEnable1,2=500µA,V
Filter Amplifier
I
B
Input Bias
RF1=150k 0.02 0.07 0.25
Current
V
V
out
I
out
G
V
(Note 1) RF1=150k 1.75 1.95 2.15 V
out
I
(Note 1) Vout=1.96V, Vfin=2.1V 400 520 650
out
Voltage Gain F=22kHz, Vin=1mV 0 46 dB
Rectifier (ZLNB2003 and ZLNB2004 ONLY)
V
REC
Vout (Note 1)
RF1=150k, IL=10µA
ILeakage RF1=150k, Vout=3V (Note 1) 20 200 nA
=33kΩ)
CAL1
LIMITS
Min Typ Max
out1,2
out1,2
=0
=10mA,
5.5
26
= 25V (Note 2) 10 25 40
POL2
V
POL1,2
POL1,2
POL1,2
POL1,2
POL1,2
= 15.5V
= 15.5V
= 14V
POL1,2
= 8.0V
= 10V
=8.0V
-0.2 VCC-0.1 V
CC
-1.0 VCC-0.9 V
V
CC
0 0.29 0.5 V
V
-1.0 VCC-0.75 V
CC
00.14V
0 0.25 0.5 V
1.8 2.0 2.2 V
12
32
100
CC
CC
CC
CC
UNITS
mA
mA
µA
µs
V
V
V
V
µA
µA
82
ZLNB2001 ZLNB2002
ZLNB2003 ZLNB2004
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):
= 25°C,VCC=5V,ID=10mA (R
T
amb
CAL1
=33kΩ)
SYMBOL PARAMETER
LIMITS
UNITS
Min Typ Max
Comparator (ZLNB2003 and ZLNB2004 ONLY)
V
TH
Threshold
F=0 2.95 3.2 3.45 V
(Note 1)
Tout 1/2
V
VHIGH
V
VHIGH
V
VLOW
Outputs
Voltage High
Voltage High
Voltage Low
ITout1,2=-20µA, Test Circuit 1,
Tone enabled
ITout1,2=-10mA, Test Circuit 1,
Tone enabled
ITout1,2=10mA, Test Circuit 1,
Tone disabled
-0.2
V
CC
-1.0
V
CC
0
V
CC
V
CC
0.29
-0.1
-0.9
V
V
0.5
CC
CC
V
V
V
Note:-
1) The parameters Filter Amplifier Vout, Iout, Rectifier Vout and Comparator Threshold Voltage
are all directly (linearly) related to Vcc.
2) Applied via 10k resistors
83
TEST CIRCUIT 1
C4
ZLNB2001 ZLNB2002
ZLNB2003 ZLNB2004
ZLNB2001
ZLNB2002
C2
68pF
R4
150k
C3
470pF
R3
10k
TEST CIRCUIT 2
C4
68pF
R4
150k
C3
470pF
G
ND
F
OUT2
F
IN2
V
POL2
ZLNB2003
ZLNB2004
C
G
F
F
V
REC2
ND
OUT2
IN2
POL2
V
C
F
F
V
V
CC
F
OUT1
F
IN1
V
POL1
CC
REC1
OUT1
IN1
POL1
V1
5V
R2
68pF
150k
C1
470pF
+
-
R1
10k
V2
(see
Note 1)
+
-
C2
R2
68pF
150k
C1
470pF
R3
10k
R6
1M
C6
100nF
C5
100nF
84
R5
1M
V1
+
5V
-
R1
10k
V2
(see
Note 1)
+
-
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