ZLNB1001
DBS tone and polarity multiplex controller
Description
The ZLNB1001 multiplex controller is one of a wide range of satellite
receiver LNB and IF distribution support circuits available from Zetex.
It supports a single IF path providing logic outputs to select one of four
IF switch input channels, which typically using PIN diodes. It is
intended for use in multi-switch applications for selection and
distribution of universal LNB IF output signals, replacing many discrete
components including the voltage regulator to save both
manufacturing cost and PCB size whilst improving reliability.
The highly accurate control input of the ZLNB1001 has both voltage and tone control for the four
required states. The voltage threshold is nominally 14.5 V and to meet the demanding
requirements of some broadcasters it has a switching range of 14.0 V to 15 V. The threshold is
temperature compensated to minimize drift. This features a low and stable input current that
enables transient protection to be achieved with the addition of only a single resistor.
The outputs are configured to deliver a positive regulated voltage drive of 7 V when a desired
channel is selected, and 0V when de-selected.
Features
■
Precision voltage and tone detectors
■
Temperature compensated
■
Low cost solution
■
Integrated tone filter
■
Powered from STB: no additional power requirement
■
Direct drive to PIN diodes
■
SO8 SMD package
Pin out - top view
VIN
VPOL
FIN
GND
1
2
3
4
8
7
6
5
Applications
■
Switch boxes for satellite IF distribution
■
LNB receivers
VOUT4
VOUT3
VOUT2
VOUT1
Issue 1 - September 2005
© Zetex Semiconductors plc 2005
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ZLNB1001
Absolute maximum ratings
Input voltage
Output current
Operating temperature
Storage temperature
25V
50mA
-40 to 85°C
-50 to 150°C
Electrical characteristics
Test conditions (unless otherwise stated): Vin = 10V to 21V via series resistor as test circuit, T
amb
= 25°C
Symbol
I
S
I
POL
V
TVPOL*
V
TFIN
V
OUTH
Parameter
Supply current
Input current at V
POL
Threshold voltage
Conditions
I
OUT
= 0
V
POL
= 15V
V
in
= 15V
T
amb
= -40 to 80°C
V
in
= 15V
f = 22kHz
†
For selected output,
I
OUT
= 20 mA (source)
For selected output,
I
OUT
= 0
V
OUTL
T
SW
Output voltage “low”
Switching speed
For unselected output,
I
OUT
= -1 mA (sink)
Min.
1.5
130
Typ.
3.2
220
Max.
5.5
350
Units
mA
µA
14
14.5
15
V
Tone threshold
Output voltage “high”
100
6.5
7.5
170
7
8
0.15
350
7.5
8.5
0.5
10
mV p-p
V
V
V
ms
NOTES:
* Threshold voltage is adjustable using external resistor.
† Waveform of 22 kHz tone is shown in test circuit diagram.
Truth table
Tone
Off
Off
On
On
V
POL
< V
TPOL
> V
TPOL
< V
TPOL
> V
TPOL
Output 1
High
Low
Low
Low
Output 2
Low
High
Low
Low
Output 3
Low
Low
High
Low
Output 4
Low
Low
Low
High
Satellite signal
Low band Vert
Low band Horiz
High band Vert
High band Horiz
Issue 1 - September 2005
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ZLNB1001
Typical application circuit using pin diodes
Input, low band vert
Input, low band horiz
IF out
Input, high band vert
R3
1k
typical
Input, high band horiz
C11 47pF typical
C2
C3
C4
R1
R2
47R
1k
U1
1
2
3
VIN
VPOL
FIN
GND
ZLNB1001
VOUT4
VOUT3
VOUT2
VOUT1
8
7
6
5
47pF typical
47pF typical
47pF typical
47pF typical
C5
C1
4.7nF
4
Application information
The schematic diagram above shows the typical application driving RF signal PIN diodes. Values
of suitable external components are shown. R1 R2 and C1 are required to achieve specified
operation. Values of other components are typical of the application. When one signal path is
selected according to the Truth Table, the selected signal diodes carry a forward current set by R3.
The other signal diodes are biased off, R3 providing a degree of reverse bias.
In order to limit the peak current in the device, it is recommended that the output decoupling
capacitor value, including C2, C3, C4 and C5, should not be excessive. Normally this total is
expected to be less than a few hundred pF in the intended application.
Issue 1 - September 2005
© Zetex Semiconductors plc 2005
3
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ZLNB1001
Package details - SO8
Package dimensions
Dimensions in inches are control dimensions, dimensions in millimeters are approximate.
DIM
Millimeters
Min.
A
A1
D
H
E
L
1.35
0.10
4.80
5.80
3.80
0.40
Max.
1.75
0.25
5.00
6.20
4.00
1.27
Inches
Min.
0.053
0.004
0.189
0.228
0.150
0.016
Max.
0.069
0.010
0.197
0.244
0.157
0.050
h
-
e
b
c
DIM
Millimeters
Min.
Max.
Inches
Min.
Max.
1.27 BSC
0.33
0.19
0°
0.25
-
0.51
0.25
8°
0.50
-
0.050 BSC
0.013
0.008
0°
0.010
-
0.020
0.010
8°
0.020
-
Europe
Zetex GmbH
Streitfeldstraße 19
D-81673 München
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
europe.sales@zetex.com
Americas
Zetex Inc
700 Veterans Memorial Highway
Hauppauge, NY 11788
USA
Telephone: (1) 631 360 2222
Fax: (1) 631 360 8222
usa.sales@zetex.com
Asia Pacific
Zetex (Asia Ltd)
3701-04 Metroplaza Tower 1
Hing Fong Road, Kwai Fong
Hong Kong
Telephone: (852) 26100 611
Fax: (852) 24250 494
asia.sales@zetex.com
Corporate Headquarters
Zetex Semiconductors plc
Zetex Technology Park, Chadderton
Oldham, OL9 9LL
United Kingdom
Telephone (44) 161 622 4444
Fax: (44) 161 622 4446
hq@zetex.com
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 contact 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.
Issue 1 - September 2005
© Zetex Semiconductors plc 2005
4
www.zetex.com
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