Document
A Product Line of Diodes Incorporated
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ZLNB2016
STANDARD DBS DUAL CHANNEL VOLTAGE AND TONE DETECTOR
Summary
The ZLNB2016 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 design provides a low supply current and a wide operating voltage whilst increasing performance and reliability. The ZLNB2016 offers excellent interference rejection with minimal application cost and packaged in the 3x3mm QFN it provides a very small solution.
Features NEW PRODUCT
• • • • • • • Two polarisation voltage detectors 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 cost True and inverted outputs to support popular multiplexer ICs
Pin Assignments
BHOR1 HOR1 ENA1 FIN1 VPOL1 VPOL2 FIN2 BHOR2 HOR2 ENA2 GND VCC
TD1 BTD1 BTD2 TD2
Top View
Application
• • • • Twin Universal LNBs Quad Universal LNBs Multi Output LNBs Satellite Multi-Switches Bottom View
GND
Twin Universal LNB System Diagram
RF Gain Stages GaAs FET’s
Down Conversion
IF Gain
IF Switching
IF Gain, LNB Control & Power Mgt. Set-top box Receiver 1
ZABG
Series
4x2 MUX
ZLNB 2016
Set-top box Receiver 2 Vout ZLPM
Series
ZLNB2016
Document number: DS32073 Rev. 1 - 2
1 of 7 www.diodes.com
February 2010
© Diodes Incorporated
A Product Line of Diodes Incorporated
www.DataSheet4U.com
ZLNB2016 Device Description
The ZLNB2016 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 down feed disable. It’s intended to be used in voltage and tone controlled LNBs and satellite distribution systems, replacing many discrete components to save both manufacturing cost and PCB size whilst improving reliability. The ZLNB2016 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 polarization control inputs of the ZLNB2016 have a nominal threshold of 14.75V and the threshold is guaranteed over the range of 14.0V to 15.5V. The threshold is temperature compensated to minimize drift and it also has 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. To ease design for this situation, each polarization input of the ZLNB2016 has a second threshold set at a nominal 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 down feed 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 polarization control voltage. To facilitate this function, the ZLNB2016 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 ZLNB2016 has been specifically designed to minimize the solution cost whilst being flexible. The ZLNB2016 only requires two external components per channel to give full user control and functionality. The ZLNB2016 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 TTL and CMOS logic, pin diodes, IF-amp supply switching and multiplexer ICs.
NEW PRODUCT
ZLNB2016
Document number: DS32073 Rev. 1 - 2
2 of 7 www.diodes.com
February 2010
© Diodes Incorporated
A Product Line of Diodes Incorporated
www.DataSheet4U.com
ZLNB2016 Maximum Ratings
Parameter Supply Voltage Supply Current VPOL 1, 2 Input Voltage (Note 1) Power Dissipation Operating Temperature Range Storage Temperature Range Rating -0.6 to +10 Continuous 50 25 500 -40 to +85 -40 to +150 Unit V mA V mW °C °C
Elec.