A Product Line of Diodes Incorporated ZLNB2015 ADVANCED DBS DUAL CHANNEL VOLTAGE AND TONE 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 design 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 Pin Assignments Two high accuracy polarisation voltage detection meeting the most stringent market needs Two robust, interference tolerant 22kHz tone detection (without external signal filtering) TD1 FIN1 No Receiver detect function for power saving and BTD1 VPOL1 isolation control BTD2 VPOL2 Low quiescent supply current, 2mA typical TD2 FIN2 Wide operating supply voltage 3V to 8V Low external component count minimises application cost True and inverted outputs to support popular multiplexer ICs Top View Application Twin Universal LNBs GND Quad Universal LNBs Multi Output LNBs Satellite Multi-Switches Bottom View Twin Universal LNB System Diagram RF Gain Stages Down IF Gain IF Switching IF Gain, Conversion LNB Control & GaAs FETs Power Mgt. Set-top box Receiver 1 ZABG ZLNB 4x2 Series 2015 MUX Set-top box Receiver 2 ZLPM Vout Series 1 of 7 January 2010 ZLNB2015 Diodes Incorporated www.diodes.com Document number: DS32061 Rev. 1 - 2 NEW PRODUCT BHOR2 BHOR1 HOR2 HOR1 ENA2 VCC ENA1 GNDA Product Line of Diodes Incorporated ZLNB2015 Device Description The ZLNB2015 dual polarization and tone switch controller is To ease design for this situation, each polarization input of the one of a wide range of satellite receiver LNB support circuits ZLNB2015 has a second threshold set at a nominal of 8V. An available from Diodes Incorporated. It features two input voltage below this threshold indicates receiver not completely independent channels, each providing logic present, and switches the relevant Ena output low. This logic outputs to control LNB polarization selection, local oscillator output can be used to disable the associated downfeed driver, selection and downfeed disable. It is intended use is in eliminating any problems due to cable mismatch. American voltage and tone controlled LNBs as well as high performance Twin, Quad and multiple feed Universal type Universal LNB local oscillator selection is achieved by LNBs, replacing many discrete components to save both detection of a low level AC voltage superimposed on the manufacturing cost and PCB size whilst improving reliability. polarization control voltage. To facilitate this function, the ZLNB2015 includes a separate tone detector for each The ZLNB2015 has been designed to be compatible in low channel. Control of detector bandwidth and sensitivity is power consumption LNBs so to improve efficiency it provided using an external resistor and capacitor for each operates from a single supply of 3V to 8V and has a channel. The tone detector has been designed give excellent quiescent current typically of only 2mA. The quiescent rejection of low frequency control signals and DiSEqC tone current does not change significantly with load or logic state. bursts. The ZLNB2015 has been specifically designed to minimize the solution cost whilst being flexible. The The two highly accurate polarization control inputs of the ZLNB2015 only requires two external components per ZLNB2015 have a nominal threshold of 14.25V and to meet channel to give full user control and functionality. The the required demanding needs of broadcasters they have a ZLNB2015 also includes complimentary outputs so that it can guaranteed threshold range of 14.0V to 14.5V. The threshold directly drive many multiplexer ICs without the need of is temperature compensated to minimize drift and it also has inverters. Any unused outputs can be left open circuit without a high rejection against the tone signal making the detector any effect to the remaining circuits operation polarization very accurate without the need of further external filtering. switch and tone detector outputs can directly drive TTL and Each features a low and stable input current that enables CMOS logic, pin diodes, IF-amp supply switching and transient protection to be achieved with the addition of only a multiplexer ICs. 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. 2 of 7 January 2010 ZLNB2015 Diodes Incorporated www.diodes.com Document number: DS32061 Rev. 1 - 2 NEW PRODUCT