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| A Product Line of Diodes Incorporated ZNBG3118 LNA GaAs FET BIAS CONTROLLER WITH POLARIZATION AND BAND SELECT Summary The ZNBG3118 is a bias and control solution designed for Satellite Low Noise Blocks (LNB's). Providing three bias stages to power control and protect the GaAs or HEMT FET low noise amplifier's (LNA's). The ZNBG3118 integrates an accurate voltage detector to select the LNB polarisation channel and an advanced tone detector to select the local oscillator (LO) for band switching. Features NEW PRODUCT * * * * * * * * * * Provides bias for up to three GaAs and HEMT FETs Dynamic FET protection and temperature compensation Drain current set by external resistor Regulated negative rail generator requires only 2 external capacitors Accurate voltage detector and polarisation switch for LNB's 22kHz tone detection for band switching with rejection of unwanted signals Band switch supports both Discrete, MIMIC and PLL local oscillators Compliant with ASTRA control specifications Low current for power efficient systems Wide operating supply range of 3.3V to 8V Pin Assignments D12 G2 G3 D3 LB HB VCC LOV RCAL FIN CSUB VPOL G1 GND CNB1 CNB2 Top View CSUB Application * * * * Single Output LNB's Two single type twin LNB's Low power LNB's PLL Single LNB's Bottom View Single Universal LNB System Diagram ZNBG3118 Document number: DS32049 Rev. 1 - 2 1 of 10 www.diodes.com January 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated ZNBG3118 Device Description The ZNBG series of devices are designed to meet the bias requirements of GaAs and HEMT FETs commonly used in satellite receiver LNBs with a minimum of external components. With the addition of two capacitors and a resistor the devices provide drain voltage and current control for three external grounded source FETs, generating the regulated negative rail required for FET gate biasing whilst operating from a single supply. This negative bias, at -2.5 volts, can also be used to supply other external circuits. The ZNBG3118 includes bias circuits to drive up to three external FETs. The voltage applied to the VPOL pin determines which one of first two FETs is operational, the third FET is permanently active. This feature is normally used as an LNB polarisation switch to select the required polarisation. Specific to Universal LNB applications is the oscillator band select. This is achieved by detecting a 22kHz tone which enables or disables the relevant local oscillator. The ZNBG3118 has been designed to control various oscillators and down converter designs including Discrete (Bi-polar or MOSFET), MIMIC oscillators and IF amplifier / down-converters IC's with logic enabled phase lock loop (PLL) oscillators. The ZNBG3118 has been designed to cope with DiSEqCTM ready set top boxes and rejects transients from channel switching. Drain current setting of the ZNBG3118 is user selectable over the range 0 to 15mA, achieved with addition of a single resistor. The drain voltage for all the FET's is set internally to 2 volts. To minimise the pin out and package size FET 1 and FET 2 share a common drain pin. These devices are unconditionally stable over the full working temperature with the FETs in place, subject to the inclusion of the recommended gate and drain capacitors. These ensure RF stability and minimal injected noise. It is possible to use less than the devices full complement of FET bias controls, unused drain and gate connections can be left open circuit without affecting operation of the remaining bias circuits. To protect the external FETs the circuits have been designed to ensure that, under any conditions including power up/down transients, the gate drive from the bias circuits cannot exceed -3V. Additionally each stage has its own individual current limiter. Furthermore if the negative rail experiences a fault condition, such as overload or short circuit, the drain supply to the FETs will shut down avoiding excessive current flow. To minimise PCB space ZNBG3118 is packaged in the 16 pin 3mm x 3mm QFN package. Device operating temperature is -40 to 85C to suit a wide range of environmental conditions. NEW PRODUCT ZNBG3118 Document number: DS32049 Rev. 1 - 2 2 of 10 www.diodes.com January 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated ZNBG3118 Maximum Ratings Parameter Supply Voltage Supply Current Power Dissipation VPOL Input Voltage Operating Temperature Range Storage Temperature Range Rating -0.6 to +12 100 500 25 Continuous -40 to +85 -40 to +150 Unit V mA mW V C C NEW PRODUCT Electrical Characteristics Parameter Supply Voltage Operating Range Supply Current Measured at Tamb = 25C, Vcc = 5V, Rcal = 39k (setting Id to 10mA) unless otherwise specified. Conditions +/-5% Supply tolerance permitted Id1 = Id2 = Id3 = 0 Id1 = 0, Id2 = Id3 = 10mA, Vpol = 15.5V Id2 = 0, Id1 = Id3 = 10mA, Vpol = 14V Id1 = Id2 = Id3 = 0, Ilb = 10mA Id1 = Id2 = Id3 = 0, Ihb = 10mA (Internally generated), Isub=0 Isub = -200uA Min 3.3 Limits Typ. Max 8.0 2.5 24 24 14 14 -2.0 -2.0 800 Units V mA mA mA mA mA V V kHz Substrate Voltage Oscillator Freq. Vpol Input Current V Threshold Switching Speed Gate characteristics Gate 1 Output Voltage Off Voltage Low Voltage High Gate 2 Output Voltage Off Voltage Low Voltage High Gate 3 Output Voltage Low Voltage High Drain characteristics Drain 12 Output Voltage High 1 Voltage High 2 Drain 3 Output Voltage High Drains 12 and 3 delta Vd vs Vcc delta Vd vs Tj D1,2 and 3 Current Range Current delta Id vs Vcc delta Id vs Tj -3.0 150 1.5 22 22 12 12 -2.5 270 Vpol = 14.75V (Applied via a 10k resistor) (Applied via a 10k resistor) 30 14.0 42 14.75 52.5 15.5 100 uA V us Id12 = 0, Vpol = 14V, Ig1 = 0 Id12 = 12mA, Vpol = 15.5V, Ig1 = -10uA Id12 = 8mA, Vpol = 15.5V, Ig1 = 0 Id12 = 0, Vpol = 15.5V, Ig2 = 0 Id12 = 12mA, Vpol = 14V, Ig2 = -10uA Id12 = 8mA, Vpol = 14V, Ig2 = 0 Id3 = 12mA, Ig3 = -10uA Id3 = 8mA, Ig3 = 0 -3.0 -3.0 0.4 -3.0 -3.0 0.4 -3.0 0.4 -2.5 -2.5 0.75 -2.5 -2.5 0.75 -2.5 0.75 -2.0 -2.0 1.0 -2.0 -2.0 1.0 -2.0 1.0 V V V V V V V V Id12 = 10mA, Vpol = 15.5V Id12 = 10mA, Vpol = 14V Id3 = 10mA Vcc = 3.3 to 8V Tj = -40 to +85C (Set by Rcal) Vcc = 3.3 to 8V Tj = -40 to +85C 1.8 1.8 1.8 2.0 2.0 2.0 0.5 50 2.2 2.2 2.2 V V V %/V ppm 0 8 10 2.5 0.05 15 12 mA mA %/V %/C ZNBG3118 Document number: DS32049 Rev. 1 - 2 3 of 10 www.diodes.com January 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated ZNBG3118 Electrical Characteristics (Continued) Parameter Output Noise Drain Voltage Gate Voltage Tone Detector Threshold Measured at Tamb = 25C, Vcc = 5V, Rcal = 39k (setting Id to 10mA) unless otherwise specified. Conditions Cgate-gnd = 4.7nF, Cdrain-gnd = 10nF ICgate-gnd = 4.7nF, Cdrain-gnd = 10nF Min Limits Typ. Units Max 0.02 0.005 Vpk-pk Vpk-pk 22kHz sq.wave, trise = tfall = 10us Square wave signal, 1Vpk-pk 100 1.0 150 5.0 300 NEW PRODUCT Noise Rejection LO Output Stage Lov Voltage Rng. Lov Bias Cur. I_LB/HB Max I_LB/HB Max LB Vout Low LB Vout High HB Vout Low HB Vout High LB Vout Low LB Vout High HB Vout Low HB Vout High LB Vout Low LB Vout High HB Vout Low HB Vout High Notes: mV pk-pk kHz Note 1 Vlov = 0 Vlov = -0.5V to Vcc - 1.0V Vlov = Vcc - 1.0V to Vcc Vlov = 0, Il = 0, Rlb-csub = 1M, Tone enabled Vlov = 0, Il = 10mA, Tone disabled Vlov = 0, Il = 0, Rhb-csub = 1M, Tone disabled Vlov = 0, Il = 10mA, Tone enabled Vlov = 4.0, Il = 0, Rlb-gnd = 1M, Tone enabled Vlov = 4.0, Il = 35mA, Tone disabled Vlov = 4.0, Il = 0, Rhb-gnd = 1M, Tone disabled Vlov = 4.0, Il = 35mA, Tone enabled Vlov = Vcc, Il = 0, Rlb-gnd = 1M, Tone enabled Vlov = Vcc, Il = 100uA, Tone disabled Vlov = Vcc, Il = 0, Rhb-gnd = 1M, Tone disabled Vlov = Vcc, Il = 100uA, Tone enabled -0.5 0 0.25 100 Vcc 1.0 35 V uA mA uA V V V V V V V V V V V V -3.0 -0.025 -3.0 -0.025 -0.1 3.9 -0.1 3.9 -0.1 Vcc-0.1 -0.1 Vcc-0.1 -2.5 0 -2.5 0 0 4.0 0 4.0 0 Vcc 0 Vcc -2.0 0.025 -2.0 0.025 0.1 4.1 0.1 4.1 0.1 Vcc+0.1 0.1 Vcc+0.1 1. V_Lov - V_LB or V_HB should not be allowed to exceed 6.0V. Care should be taken concerning the Off-state voltages of outputs LB and HB if V_Lov is set to greater than 6.0V. Similarly, Vcc - V_LB or V_HB should not be allowed to exceed 8.5V. 2. ESD sensitive, handling precautions are recommended. ZNBG3118 Document number: DS32049 Rev. 1 - 2 4 of 10 www.diodes.com January 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated ZNBG3118 Typical Characteristics 16 14 (Measured at TAMB = 25C, VCC = 5V, RCAL = 39k (setting ID to 10mA) unless otherwise stated) 2.5 2.4 2.3 Drain Current (mA) Drain Voltage (V) 0 20 40 60 80 100 120 140 160 180 200 12 10 8 6 4 2 0 2.2 2.1 2 1.9 1.8 1.7 1.6 1.5 0 2 4 6 8 10 12 14 16 NEW PRODUCT RCAL Value (k ) Drain Current (mA) Drain Current vs RCAL Value Drain Voltage vs Drain Current Single Universal Block Diagram Figure 1 shows the main elements of a typical single universal LNB. The ZNBG3118 is compliant with virtually all markets including the fleet of Astra satellites. The simple but flexible solution provides the negative rail, FET bias control, polarisation switch control, tone detection and band switching with the minimum of external components. The ZNBG3118 can be also used in other DBS applications such a twin output, mono-block and Low power LNB's. Figure 1 Typical single universal LNB system diagram Polarization and band switching on the ZNBG3118 uses the standard 13V-17V and 22kHz as defined by Astra. The exception is that the devices voltage detector has a much tighter tolerance than defined to increase field reliability. The tone detector has been designed to cope with distorted 22kHz tones so reliability is maintained with regional differences and variations on set-top box designs. Tone detection and band switching has been designed to meet various different system architectures. The following diagrams (figures 2 to 4) show how this feature operates in an LNB and the external components required. The presence or absence of a 22kHz tone applied to pin FIN enables one of two outputs, LB and HB. A tone present enables HB and tone absent enables LB. The LB and HB outputs are designed to be compatible with MMIC, Discrete (bipolar or FET) and PLL based local oscillator applications and are easily configured by the LOV pin. Bi-polar or FET local oscillators Referring to Figure 2 wiring pin LOV to a positive voltage source (e.g. a potential divider across VCC and ground set to the required oscillator supply voltage, VOSC) will force the LB and HB outputs to provide the required oscillator supply. VOSC when enabled and 0V when disabled. Driving loads of up to 35mA, the maximum allowed programmed output voltage of LB and HB is VCC -1V. If a greater supply voltage is required for the oscillators then it may be possible to use an oscillator circuit. ZNBG3118 Document number: DS32049 Rev. 1 - 2 5 of 10 www.diodes.com January 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated ZNBG3118 MIMIC local oscillators Referring to Figure 3 wiring pin LOV to ground will force LB and HB to switch between -2.5V (disabled) and 0V (enabled). Note that Vcc(max) should not exceed 6.0V when using this configuration. Logic enabled PLL local oscillators Referring to Figure 4 connecting the LOV pin to Vcc will pull the LB and HB to VCC when enabled and 0V when disabled. Using the same supply voltage for the ZNBG3118 and the PLL local oscillator block, the LB and HB outputs will provide a suitable logic signal of up to 100uA to drive the LO select pin of a PLL system. Local Oscillator Configurations D12 G2 G3 NEW PRODUCT D3 G1 Gnd Cnb1 Cnb2 CNB 47nF Csub Rcal Fin Vpol CSUB 47nF ZNBG3118 LB HB Vcc Lov RLV1 RLV2 RHB2 RHB1 RLB1 RLB2 CLB CHB Q1 Q2 RCAL 39k CFIN 330pF 9.75GHz Local Osc. 10.6GHz Local Osc. RPOL 10k Vcc LNB Downf eed Figure 2 Applications circuit for the ZNBG3118 using Bi-polar oscillators D12 G2 G3 D3 Vcc RLB1 RHB1 G1 Gnd Cnb1 Cnb2 CNB 47nF Csub Rcal Fin CSUB 47nF Vpol ZNBG3118 LB HB Vcc Lov G1 Local Osc. MMIC G2 RHB2 240k RLB2 240k CLB RCAL 39k CFIN 330pF CHB RPOL 10k LNB Downf eed Figure 3 Applications circuit for the ZNBG3118 using MIMIC local oscillators ZNBG3118 Document number: DS32049 Rev. 1 - 2 6 of 10 www.diodes.com January 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated ZNBG3118 D12 G2 G3 D3 Vcc G1 Gnd Cnb1 Cnb2 CNB 47nF Csub Rcal Fin CSUB 47nF Vpol ZNBG3118 LB HB Vcc Lov RHB HB Local Osc. PLL NEW PRODUCT RCAL 39k CFIN 330pF RPOL 10k LNB Downf eed Figure 4 Applications circuit for the ZNBG3118 using logic controlled PLL local oscillators at 3.3V Functional Tables ZNBG3118 System Function Inputs Vin (V) <14.0 >15.5 <14.0 >15.5 Fin (kHz) 0 0 22 22 FET 1 Disabled Active Disabled Active FET 2 Active Disabled Active Disabled Outputs FET 3 Active Active Active Active LB(1) Active Active Disabled Disabled HB(1) Disabled Disabled Active Active Note 1: See LO description above and the table below for explanation of Active and Disabled. Tone Detection Function Lov Gnd Vosc Vcc Fin (kHz) 0 22 0 22 0 22 LB Enabled Disabled Enabled Disabled Enabled Disabled Disabled Enabled Disabled Enabled Disabled Enabled HB LB Gnd -2.5V Vosc Note (2) Vcc - 0.1V Note (2) HB -2.5V Gnd Note (2) Vosc Note (2) Vcc - 0.1V Note 2: 0 Volts in a typical LNB application but dependant on the external circuits ZNBG3118 Document number: DS32049 Rev. 1 - 2 7 of 10 www.diodes.com January 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated ZNBG3118 Applications Information * L1 * L3 * C1 C2 10nF C7 10nF * C8 J1 * L3 J2 * L2 * L4 J3 C6 10nF * C5 * C3 C4 10nF C9 10nF * C10 NEW PRODUCT D12 G2 G3 D3 G1 Gnd Cnb1 Cnb2 * Stripline Elements CNB 47nF Rcal Csub Fin CSUB 47nF Vpol ZNBG3118 LB HB Vcc Lov RLV1 RLV2 RHB2 RHB1 RLB1 RLB2 CLB CHB Q4 Q5 RCAL 39k CFIN 330pF 9.75GHz Local Osc. 10.6GHz Local Osc. RPOL 10k Vcc LNB Downf eed Figure 5 Applications circuit for the ZNBG3118 using Bi-polar local oscillators Figure 5 is a typical applications circuit for the ZNBG3118, showing all the external components required for appropriate biasing. The bias circuits are unconditionally stable over the full temperature range with the associated FETs and gate and drain capacitors in circuit. Capacitors C2, C4, C6, C7 and C9 ensure that residual power supply and substrate generator noise is not allowed to affect external circuits which may be sensitive to interference. They also serve to suppress any potential RF feed through between stages via the ZNBG3118. These capacitors are required for all stages used. Values around 10nF are recommended however this is design dependent and any value between 1nF and 100nF could be used. The capacitor CSUB is an integral part of the ZNBG3118 negative supply generator. The negative bias voltage is generated on-chip using an internal oscillator. The required value of capacitor CSUB is 47nF. This generator produces a low current supply of approximately -2.5V. Although this generator is intended purely to bias the external FETs, it can be used to power other external low current circuits via the CSUB pin. Note that the exposed pad of the package must be either left floating or connected to Csub. Resistor RCAL sets the drain current at which all external amplifier FETs are operated. To minimize the pin-count and package size Drain 1 (D1) and Drain 2 (D2) share a common pin. If any bias control circuit is not required, its related drain and gate connections may be left open circuit without affecting the operation of the remaining bias circuits. The ZNBG3118 has been designed to protect the external FETs from adverse operating conditions. With a JFET connected to any bias circuit, the gate output voltage of the bias circuit can not exceed the range -3V under any conditions, including power up and power down transients. Should the negative bias generator be shorted or overloaded so that the drain current of the external FETs can no longer be controlled, the drain supply to FETs is shut down to avoid damage to the FETs by excessive drain current. ZNBG3118 Document number: DS32049 Rev. 1 - 2 8 of 10 www.diodes.com January 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated ZNBG3118 Package Outline Dimensions E A1 D A3 Pin #1 ID E2 L A NEW PRODUCT e b Z D2 QFN16 3x3 Dim Min Max A 0.55 0.65 A1 0.00 0.05 A3 0.15 Typ b 0.18 0.28 D 2.95 3.05 D2 1.40 1.60 e 0.50 BSC E 2.95 3.05 E2 1.40 1.60 L 0.35 0.45 Z 0.625 Typ All Dimensions in mm Note: Controlling dimensions are in millimetres. Approximate dimensions are provided in inches. The package appearance may vary as shown, for further details please contact your local Diodes sales office. Ordering Information Device ZNBG3118JA16TC (Note x) Package QFN1633 Reel Size (inches) 18 Tape Width (mm) 8 Quantity (per reel) 3000 Marking Information Pin 1 ZNBG 3118 YYWW Part Name Date Code Year/Week ZNBG3118 Document number: DS32049 Rev. 1 - 2 9 of 10 www.diodes.com January 2010 (c) Diodes Incorporated A Product Line of Diodes Incorporated ZNBG3118 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. NEW PRODUCT Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2009, Diodes Incorporated www.diodes.com ZNBG3118 Document number: DS32049 Rev. 1 - 2 10 of 10 www.diodes.com January 2010 (c) Diodes Incorporated |
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