Diodes ZLNB2015 User Manual

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Diodes Incorporated

ZLNB2015

ADVANCED DBS DUAL CHANNEL VOLTAGE AND TO NE DETECTOR

Summary

The ZLNB2015 is a dual channel polarisation (voltage) and band select (tone) detector IC, primarily for satellite applications such as Low Noise Blocks (LNBs) and satellite distribution systems. An optimised d esign provides a low supply current and a wide operating voltage whilst increasing performance and reliability. The ZLNB2015 offers excellent interference rejection with minimal application cost and packaged in the 3x3mm QFN it provides a very small solution.

Features

• Two high accuracy polarisation voltage detection meeting the most stringent market needs

• Two robust, interference tolerant 22kHz tone detection (without external signal filtering)

• “No Receiver” detect function for power saving and isolation control

• Low quiescent supply current, 2mA typical

• Wide operating supply voltage 3V to 8V

• Low external component count minimises application

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cost

• True and inverted outputs to support popular multiplexer ICs

Application

• Twin Universal LNBs

• Quad Universal LNBs

• Multi Output LNBs

• Satellite Multi-Switches

Pin Assignments

BTD1 BTD2

TD2

VCC

HOR1

BHOR1

ENA2

HOR2

BHOR2

Top View

GND

Bottom View

ENA1

FIN1TD1 VPOL1

VPOL2 FIN2

GND

Twin Universal LNB System Diagram

RF Gain Stages GaAs FET’s

ZABG

Series

Down Conversion

ZLNB2015

Document number: DS32061 Rev. 1 - 2

IF Gain IF Switching IF Gain, LNB Control & Power Mgt.

4x2

MUX

Vout

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ZLNB

2015

ZLPM

Series

Set-top box Receiver 1

Set-top box Receiver 2

January 2010

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ZLNB2015

Device Description

The ZLNB2015 dual polarization and tone switch controller is one of a wide range of satellite receiver LNB support circuits available from Diodes Incorporated. It features two completely independent channels, each providing logic outputs to control LNB polarization selection, local oscillator selection and downfeed disable. It is intended use is in American voltage and tone controlled LNBs as well as high performance Twin, Quad and multiple feed Universal type LNBs, replacing many discrete components to save both manufacturing cost and PCB size whilst improving reliability.

The ZLNB2015 has been designed to be compatible in low power consumption LNBs so to improve efficiency it operates from a single supply of 3V to 8V and has a quiescent current typically of only 2mA. The quiescent current does not change significantly with load or logic state.

The two highly accurate polarization control inputs of the ZLNB2015 have a nominal threshold of 14.25V and to meet the required demanding needs of broadcasters they have a guaranteed threshold range of 14.0V to 14.5V. The threshold is temperature compensated to minimize drift and it also has

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a high rejection against the tone signal making the detector very accurate without the need of further external filtering. 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. Multi Feed LNBs can be called to operate with one or more of their controlling receivers powered down or disconnected, with attendant cable mismatch problems.

ZLNB2015

Document number: DS32061 Rev. 1 - 2

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To ease design for this situation, each polarization input of the ZLNB2015 has a second threshold set at a nomi nal of 8V. An input voltage below this threshold indicates “receiver not present”, and switches the relevant Ena output low. This logic output can be used to disable the associated downfeed driv er, 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 polarization control voltage. To facilitate this function, the ZLNB2015 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 ZLNB2015 has been specifically designed to minimize the solution cost whilst being flexible. The ZLNB2015 only requires two external components per channel to give full user control and functionality. The ZLNB2015 also includes complimentary outputs so that it can directly drive many multiplexer ICs without the need of inverters. Any unused outputs can be left open circuit without any effect to the remaining circuits operation polarization switch and tone detector outputs can directly drive TT L and CMOS logic, pin diodes, IF-amp supply switching and multiplexer ICs.

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ZLNB2015

Maximum Ratings

Parameter Rating Unit

Supply Voltage -0.6 to +10 Continuous V Supply Current 50 mA V

1, 2 Input Voltage (Note 1) 25 V

POL

Power Dissipation 500 mW Operating Temperature Range -40 to +85 °C Storage Temperature Range -40 to +150 °C

Electrical Characteristics (at Tamb = 25°C, Vcc = 3.3V unless otherwise specified.

Parameter Conditions Min. Typ. Max. Unit

Operating Voltage Range 3.0 8.0 V Supply Current All outputs unloaded, any combination of inputs 2.0 3.0 mA

1, 2 Inputs (Note 1)

POL

Input Current V HOR Threshold T

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ENA Threshold T Switching Speed HOR, BHOR and ENA outputs 1 ms

HOR1, 2 Outputs

Voltage High I Voltage Low I

BHOR1, 2 Outputs

Voltage High I Voltage Low I

ENA1, 2 Outputs

Voltage High I Voltage Low I

FIN 1, 2 Inputs (Using Test Circuit 1) Bias Voltage I

Input Impedance V Amplifier Gain V Voltage Threshold 100 150 300 mV Switching Delay TD Outputs 3 10 ms

TD1, 2 Outputs (Using Test Circuit 1) Voltage High I Voltage Low I

BTD1, 2 Outputs (Using Test Circuit 1) Voltage High I Voltage Low I

Notes: 1. V

2. ESD sensitive, handling precautions are recommended.

stimulus applied via 6.8k resistors. All levels measured on the input to these resistors.

POL

ZLNB2015

Document number: DS32061 Rev. 1 - 2

1,2 = 15V 32 42.5 53 uA

POL

= -40 to +85°C 14.0 14.25 14.5 V

AMB

= -40 to +85°C 7.5 8.0 8.5 V

AMB

= -1mA, V

LOAD

= 5mA, V

LOAD

= -1mA, V

LOAD

= 5mA, V

LOAD

= -1mA, V

LOAD

= 5mA, V

LOAD

= 0 1.25 1.74 2.25 V

FIN

= 100mV

FIN

= 100mV

FIN

= -1mA, Tone Enabled VCC-0.5 VCC-0.3 VCC V

LOAD

= 5mA, Tone Disabled 0 0.3 0.5 V

LOAD

= -1mA, Tone Disabled VCC-0.5 VCC-0.3 VCC V

LOAD

= 5mA, Tone Enabled 0 0.3 0.5 V

LOAD

1,2 = 14.5V VCC-0.5 VCC-0.3 VCC V

POL

1,2 = 14.0V 0 0.3 0.5 V

POL

1,2 = 14.0V VCC-0.5 VCC-0.3 VCC V

POL

1,2 = 14.5V 0 0.3 0.5 V

POL

1,2 = 8.5V VCC-0.5 VCC-0.3 VCC V

POL

1,2 = 7.5V 0 0.3 0.5 V

POL

40 kΩ

P/P

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