RELEVANT PRODUCTS ACA0861A ACA0861B ACA0861C ACA0861D Figure basi
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ACA0861 750/860 CATV Line Amplifiers
RELEVANT PRODUCTS
ACA0861A ACA0861B ACA0861C ACA0861D Figure basic cascade circuit topology, shown Figure used each amplifier. This circuit approach meets demanding performance requirements distortion noise figure. ACA0861 Amplifiers cascaded between baluns used create hybrid equivalent, each amplifier having 12dB gain each. Reducing gain 12dB allows more feedback amplifier, improving distortion amplifier, flattening gain improving device device repeatability, while spreading power dissipation. Dividing power dissipated between packages allows fully machine insertable plastic surface mount packages amplifiers, greatly reducing final assembly costs.
ACA0861
OVERVIEW THIS PART?
option available CATV Trunk amplifier Line Extender designers. ANADIGICS ACA0861 family surface mount monolithic GaAs Linear Amplifiers been developed replace, future designs, standard Silicon Hybrid amplifiers presently use. This family amplifiers designed specifically demanding CATV market. product with outstanding performance, coupled with exceptional reliability ruggedness, required CATV industry, result years research development. Designers utilizing this part expect better linearity, higher overall gain, flatter frequency response, better return loss, lower noise figure, lower power consumption competitive price compared standard Hybrids. surface mount package allows fully automated assembly, reducing inherent product costs. While this part requires more up-front engineering than using present CATV Hybrids standard package, user will benefit long term following ways: Lower total material costs than standard hybrid circuit. Lower assembly costs fully automated assembly PCB. Better CTB, XMODs Better return loss Lower power consumption
Figure ACA0861 Block Diagram
this part? Because highest performance, lowest cost solution available.
BASIC CIRCUITS OPERATION
ACA0861 consists monolithic GaAs linear amplifiers connected parallel, shown Figure Basic Amplifier Stage Circuit Topology
08/2001
ACA0861 750/860 CATV Line Amplifiers amplifiers fabricated GaAs using MESFET process. Utilizing MESFETs enhances third order distortion performance (CTB), since MESFETs generally square devices with third order terms. Monolithic amplifiers provide matching between amplifiers, which yields outstanding second order cancellation, giving improved performance what currently available. Flat frequency response, good input output match distortion achieved using transistors. On-chip circuitry assures good stability under high VSWR load conditions, preventing unwanted oscillations. MESFETs also gives noise figures, typically amplifiers alone, full cascade. noise figure remains very flat across full frequency range. input output impedance each amplifier designed 37.5 ohms, half standard ohms. This gives matched input output impedance when combined with external transmission line baluns. Typically, overall return loss greater than across full frequency band. Figure shows basic biasing circuit used. This consists external bias chokes, 300pF coupling capacitors bypassing capacitors fixed resistor select desired bias current. supply voltage VDC, typical hybrid modules. reduced voltage allows significant power dissipation saving. resistor used supply current drawn amplifiers. resistor values initially fixed each four amplifier types different value user, changing current distortion characteristics amplifier, optimize performance given application. great deal flexibility design Trunk Amplifiers Line Extenders since designs provide optimum distortion level minimum power dissipation with repeatability monolithic fabrication. Refer ACA0861 data sheet individual specifications.
12dB
ACA0861
390nH .300
12dB
.300
Figure Basic Biasing Circuit
Table Description
DESCRIPTION Leave Open RFIN RFIN IADJ Resistor DESCRIPTION RFOUT RFOUT
ACA0861 FAMILY AMPLIFIERS
There four ACA0861 amplifier versions through available. Specifying distortion performance specific output signal levels differentiates amplifiers. Amplifiers have distortion performance specified dBmV output signal level level input stage applications. Amplifiers have distortion performance specified dBmV output signal level high level output stage applications. Each four amplifiers operates different current. This adds
Application Note 08/2001
Table Resistor Values
PART TYPE ACA0861A ACA0861B ACA0861C ACA0861D VALUE 21.5 Open
ACA0861 750/860 CATV Line Amplifiers
BUILDING HYBRID EQUIVALENT
Basic Schematic construct hybrid equivalent amplifier circuit shown Figure used. This consists ACA0861 amplifiers cascaded between transmission line baluns. construct equivalent standard hybrid, ACA0861A cascaded with ACA0861B. construct improved power doubler hybrid equivalent, ACA0861C cascaded with ACA0861D. Even better performance achieved cascading ACA0861D together. Table different cascading possibilities. This configuration typically provides gain when balun losses accounted for. Separating overall gain between stages provides flexibility designer able match amplifiers provide exact distortion performance required minimum power dissipation. Three four stages also cascaded reducing number baluns required. Biasing coils, coupling capacitors bias select resistors needed shown. External Component Selection Chip surface mount external components should used biasing coupling. bias coils should have equivalent series resistance limit voltage drop across them, have high enough current rating part selected should have series resonance within passband interest. Capacitors should chip surface mount type. current select resistor small chip resistor (maximum current mA). Layout Consideration same care precautions commonly used layouts should used here. optimum performance, transmission lines between baluns should have characteristic impedance 37.5 ohms. Transmission lines connected secondary baluns should laid characteristic impedance. 37.5 transmission lines wide depending thickness circuit board. line thickness wide, coplanar transmission line used reduce line width. bottom package contains heat slug, which provides thermal impedance path remove heat generated device, ground. This must soldered good ground with thermal resistance chassis (see section Thermal Considerations). Balun Selection/Design baluns required addition amplifiers. Typically, transmission line balun used good frequency response, amplitude balance, phase balance ease assembly. schematic diagram assembly diagram transmission line balun shown Figure good results characteristic impedance twin lead transmission line with typically turns around ferrite core. ferrite core should loss with high enough permeability
12dB ACA0861 12dB 300pF ACA0861
300pF
12dB
300pF
12dB
300pF
Figure Hybrid Equivalent Circuit
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers provide high return impedance output with number turns used. number turns used affected considerations; there must enough turns achieve adequate flux frequency response required many turns, high frequency response will affected stray capacitance. Table also includes parts list typical 750/860 balun. This circuit does third, tertiary winding which used improve phase amplitude balance. Other balun configurations used, though they must match into 37.5 impedance.
Table Cascade Possibilities
CASCADE POSSIBILITIES STAGE ACA0861A ACA0861C ACA0861A ACA0861B ACA0861D STAGE ACA0861B ACA0861D ACA0861C ACA0861D ACA0861D RESULT STANDARD 750/860 HYBRID 750/860 POWER DOUBLER POWER, INCREASED DISTORTION HIGH POWER, VERY DISTORTION VERY HIGH POWER, EXTREMELY DISTORTION
Table Parts List Balun
ITEM Ferrite Core Twin Lead MANUFACTURER/PART NUMBER Philips 135CT050-3D3 B2383611
TRANSMISSION LINE
FUNCTIONAL BALUN SCHEMATIC
BALUN ASSEMBLY
Figure Balun Schematic Assembly
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers
IMPROVED TEMPERATURE BIAS CIRCUIT
standard distortion performance temperature ACA0861 family amplifiers improved, when necessary, addition external 5.6K resistor with positive temperature coefficient disconnecting ACA0861. This change shown Figure figure shows 5.6K resistor connected between supply device. addition, left floating cannot connected ground. This circuit reduces current variation amplifiers with temperature minimizes distortion performance changes. optimum performance 5.6K resistor temperature coefficients listed Table recommended. Table Temperature Coefficients Resistor
PART NUMBER ACA0861A ACA0861B ACA0861C ACA0861D +7000 ppm/C +3900 ppm/C +3900 ppm/C +1400 ppm/C NOTES Usually needed
potential source resistors LT73 line positive temperature coefficient resistors from Speer Electronics, Inc. (814) 362-5536 USA. These chip resistors supplied tape reel. Please note that user must determine these resistors acceptable their application, ANADIGICS does make claims third party products.
RELIABILITY RESULTS
ACA0861 family amplifiers designed specifically demanding CATV market, where reliability parts hostile environment utmost importance. This product designed from beginning with this mind. oversized layout, eutectic mount, custom SOIC package with heat slug were developed minimize channel temperature, greatly improving reliability. These devices fabricated using proven GaAs MESFET process with largest GaAs reliability database industry. Temperature cycling, temperature shock, HAST tests have confirmed that rugged design exists. Overall, hours expected with package heat slug temperature 110°C. summary reliability testing date shown Table
.01uF 12dB ACA0860 12dB 300pF .01uF ACA0860 12dB
300pF
300pF
12dB
300pF
Figure ACA0861 Improved Temperature Bias Option
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers Table Test Conditions
TEST SPECIFICATION CONDITIONS PRESTRESS 85%RH/85C/72Hours Reflow 230C,Peak STRESS -65C +150C Cycles Cycles 1000 Cycles PRESTRESS 85%RH/85C/72 Hours Reflow 230C Peak HUMIDITY STRESS JEDEC-22-A101 Without Bias Hast Accelerated Humidity Solderability Lead Integrity Brand Permanence JEDEC 22-A110 Bias MIL-STD-883 Method 2003 ANADIGICS 80010-330 MIL-STD-883 Method 2015 ANADIGICS 60021-001 STRESS 85%RH/85C 1000 Hours 85%RH/125C Hours Hour Steam Coverage Bend Return Terpene Solvent Only 4-Grams Minimum 4-Wires/Device PASS/FAIL
Temperature Cycling Pre-stress
PRESTRESS JEDEC-JESD22 Test Method A112 (Reduced) TEMP CYCLE STRESS MIL-STD-883 Method 1010
Steady State Humidity w/Pre-stress
PRESTRESS JEDEC-JESD22 Test Method A112 (Reduced)
Wire Pull
Shear MIL-STD-883 Method 3015 HBM/100PF/1500
1-Kgram Minimum
Volts Pins 11,14,15
THERMAL MOUNTING CONSIDERATIONS
layout ACA0861 family amplifiers must consider both electrical requirements parts (proper line impedance, bypassing, etc.) thermal requirements. thermal requirement, meet stated data sheet, states that maximum temperature heat slug bottom ACA0861 package 110° must designed meet this
requirement maximum expected system ambient temperature. this, following parameters need known: maximum external ambient temperature temperature rise chassis above external ambient temperature internal heat being generated parts inside. Once these parameters known maximum temperature rise between chassis ACA0861 devices easily calculated.
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers maximum allowable temperature rise (Tmax) from chassis ACA0861 calculated follows: Tmax Text Tchassis where maximum operating temperature ACA0861, measured heat slug (110 oC); Text maximum external temperature; Tchassis temperature rise chassis internal heating. example, Tchassis then Tmax above example, rise allowed mount between bottom ACA0861 chassis. Knowing this, designed that provides thermal resistance which will maintain rise less. Thermal Interfaces There typically three different thermal interfaces between bottom ACA0861 chassis. first solder connection ACA0861 heat slug PCB. second interface heat transfer through PCB, third chassis interface. (See Figure first interface, solder connection ACA0861 heat slug PCB, should cover full area ACA0861 heat slug maximum effectiveness. second interface heat transfer through PCB. FR4, typical material, very poor thermal conduction properties cannot used without addition plated through holes under ACA0861. vias holes should copper plated then solder filled lowest thermal resistance. vias then conduct heat through bottom PCB, while material provides little conduction. thermal resistance vias holes, given degree rise watt power dissipation, function diameter thickness copper plating walls vias. Tables show calculated thermal resistance solder filled plated though holes with different diameters copper plating thicknesses. Table shows thermal resistance with copper plating, Table with mil, Table with copper plating, where 0.001". thermal resistance copper plating alone shown column "plating". thermal resistance solder fill shown next column column labeled "combined" shows calculated thermal resistance both copper plating solder fill single via. next columns show thermal resistance achieved using multiple vias. example, diameter with thick copper plating following properties:
Thermal resistance copper plating 29.6° Thermal resistance solder fill 63.4° Combined thermal resistance single 20.17°
thermal resistance 20.17 °C/Watt would produce 125° rise with Watts power dissipation (ACA0861D device), therefore, single cannot used. more vias added combined thermal resistance decreases quickly determined same parallel resistors.
From Table vias have thermal resistance 2.02° Watt, while vias have thermal resistance only 0.50° Watt. forty dia. vias used instead one, temperature rises though only watts. actual diameter, thickness copper plating, number vias used will determined limits manufacturing process used. third interface between chassis. Note chassis considered infinite heat sink this application note. Unlike ACA0861 interface, this cannot solder connection mismatch thermal expansion chassis material other production problems. thermally conductive elastomer gasket material recommended. such material that applicable this application Thermagon, Inc.'s* T-PLI material. This material thermally conductive, conformable elastomer that available either sheet form size. This Thermagon, Inc. (216) 741-7659
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers material should conform irregularities chassis surfaces caused manufacturing process while providing thermal resistance. sheet thickness mils appears best compromise between thermal resistance, tolerance buildup, handling. thick material stated thermal resistance 0.14° Watt. Using square area square inch this interface power dissipation Watts, temperature rise 8.7° expected. should attached chassis with screws, providing slight compression elastomer material. user must determine this material acceptable their application; ANADIGICS does make claims third party products. Putting Together board manufactured using diameter vias grid with center center spacing. total vias used shown Figure Vias were extended beyond heat slug area heat conduction copper plating. board fabricated with copper plating solder filled vias. ACA0861D part soldered clamped brass block with 20mil thick T-PLI material between brass block. Approximately mils compression TPLI material used. scan assembly then done showing rise from brass block bottom heat slug 5.64 watts power dissipation. This agrees well with theoretical calculation. T-PLI material have calculated thermal resistance, based upon measurement, 2.5° Watt. full watts dissipation, rise from chassis ACA0861 heat slug would only 15.5° Thermal Conclusion ACA0861 family amplifiers uses wide body SOIC package that custom designed surface mount applications with high power dissipation. multiple copper plated, solder filled vias under package's heat slug while using thermal conductive elastomer gasket material between chassis provides thermal resistance mount.
HEAT SLUG PACKAGE SOLDERED
ACA0861
HEAT SLUG
THERMALLY CONDUCTIVE ELASTOMER PLATED THROUGH HOLES COMPLETELY FILL VIAS WITH SOLDER
BOARD
CHASSIS
Figure ACA0861 Mounting Front
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers Table Thermal Resistance Solder Filled, Plated Through Hole Plating Thickness
(Mils) Thermal resistance (°C/Watt) Plating 265.2 239.2 217.9 200.0 184.9 171.8 160.5 150.6 141.9 134.1 127.1 120.8 115.1 109.9 105.2 100.8 96.8 93.1 89.7 86.5 83.6 80.8 78.2 75.8 73.5 71.4 69.3 67.4 65.6 63.9 62.3 60.7 59.2 57.8 56.5 55.2 54.0 52.8 51.7 50.6 49.6 Fill 863.7 689.7 563.4 468.9 396.3 339.4 293.9 257.0 226.6 201.3 180.0 161.9 146.4 133.1 121.5 111.3 102.4 94.5 87.4 81.2 75.6 70.5 65.9 61.8 58.1 54.6 51.5 48.6 46.0 43.6 41.3 39.3 37.3 35.6 33.9 32.4 30.9 29.6 28.3 27.1 26.0 Combined 202.92 177.62 157.12 140.21 126.06 114.08 103.83 94.96 87.24 80.47 74.49 69.19 64.45 60.20 56.37 52.90 49.76 46.90 44.28 41.88 39.68 37.65 35.78 34.04 32.43 30.94 29.55 28.25 27.04 25.90 24.84 23.84 22.90 22.02 21.18 20.40 19.66 18.96 18.29 17.66 17.06 20.29 17.76 15.71 14.02 12.61 11.41 10.38 9.50 8.72 8.05 7.45 6.92 6.44 6.02 5.64 5.29 4.98 4.69 4.43 4.19 3.97 3.77 3.58 3.40 3.24 3.09 2.95 2.82 2.70 2.59 2.48 2.38 2.29 2.20 2.12 2.04 1.97 1.90 1.83 1.77 1.71 10.15 8.88 7.86 7.01 6.30 5.70 5.19 4.75 4.36 4.02 3.72 3.46 3.22 3.01 2.82 2.65 2.49 2.34 2.21 2.09 1.98 1.88 1.79 1.70 1.62 1.55 1.48 1.41 1.35 1.30 1.24 1.19 1.15 1.10 1.06 1.02 0.98 0.95 0.91 0.88 0.85 Multiple Vias 6.76 5.92 5.24 4.67 4.20 3.80 3.46 3.17 2.91 2.68 2.48 2.31 2.15 2.01 1.88 1.76 1.66 1.56 1.48 1.40 1.32 1.26 1.19 1.13 1.08 1.03 0.98 0.94 0.90 0.86 0.83 0.79 0.76 0.73 0.71 0.68 0.66 0.63 0.61 0.59 0.57 5.07 4.44 3.93 3.51 3.15 2.85 2.60 2.37 2.18 2.01 1.86 1.73 1.61 1.50 1.41 1.32 1.24 1.17 1.11 1.05 0.99 0.94 0.89 0.85 0.81 0.77 0.74 0.71 0.68 0.65 0.62 0.60 0.57 0.55 0.53 0.51 0.49 0.47 0.46 0.44 0.43 4.06 3.55 3.14 2.80 2.52 2.28 2.08 1.90 1.74 1.61 1.49 1.38 1.29 1.20 1.13 1.06 1.00 0.94 0.89 0.84 0.79 0.75 0.72 0.68 0.65 0.62 0.59 0.56 0.54 0.52 0.50 0.48 0.46 0.44 0.42 0.41 0.39 0.38 0.37 0.35 0.34 3.38 2.96 2.62 2.34 2.10 1.90 1.73 1.58 1.45 1.34 1.24 1.15 1.07 1.00 0.94 0.88 0.83 0.78 0.74 0.70 0.66 0.63 0.60 0.57 0.54 0.52 0.49 0.47 0.45 0.43 0.41 0.40 0.38 0.37 0.35 0.34 0.33 0.32 0.30 0.29 0.28
Notes: Thickness mils Plating Thickness mils Plating Thermal Conductivity 3.98 W/cm Fill Conductivity 0.51 W/cm
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers Table Thermal Resistance Solder Filled, Plated Through Hole Plating Thickness
(Mils) Thermal Resistance (C/Watt) Plating 216.9 195.2 177.5 162.7 150.2 139.4 130.1 122.0 114.8 108.5 102.7 97.6 93.0 88.7 84.9 81.3 78.1 75.1 72.3 69.7 67.3 65.1 63.0 61.0 59.2 57.4 55.8 54.2 52.8 51.4 50.1 48.8 47.6 46.5 45.4 44.4 43.4 42.4 41.5 40.7 39.8 Fill 952.2 752.3 609.4 503.6 423.2 360.6 310.9 270.8 238.0 210.9 188.1 168.8 152.3 138.2 125.9 115.2 105.8 97.5 90.1 83.6 77.7 72.5 67.7 63.4 59.5 56.0 52.7 49.7 47.0 44.5 42.2 40.1 38.1 36.3 34.5 33.0 31.5 30.1 28.8 27.6 26.4 Combined 176.67 155.00 137.45 122.96 110.84 100.56 91.74 84.12 77.47 71.62 66.45 61.85 57.73 54.04 50.70 47.68 44.93 42.42 40.12 38.01 36.07 34.28 32.63 31.09 29.67 28.34 27.10 25.95 24.86 23.85 22.90 22.00 21.16 20.37 19.62 18.91 18.24 17.61 17.01 16.44 15.90 17.67 15.50 13.74 12.30 11.08 10.06 9.17 8.41 7.75 7.16 6.64 6.18 5.77 5.40 5.07 4.77 4.49 4.24 4.01 3.80 3.61 3.43 3.26 3.11 2.97 2.83 2.71 2.59 2.49 2.38 2.29 2.20 2.12 2.04 1.96 1.89 1.82 1.76 1.70 1.64 1.59 8.83 7.75 6.87 6.15 5.54 5.03 4.59 4.21 3.87 3.58 3.32 3.09 2.89 2.70 2.53 2.38 2.25 2.12 2.01 1.90 1.80 1.71 1.63 1.55 1.48 1.42 1.36 1.30 1.24 1.19 1.14 1.10 1.06 1.02 .098 0.95 0.91 0.88 0.85 0.82 0.79 Multiple Vias 5.89 5.17 4.58 4.10 3.69 3.35 3.06 2.80 2.58 2.39 2.21 2.06 1.92 1.80 1.69 1.59 1.50 1.41 1.34 1.27 1.20 1.14 1.09 1.04 0.99 0.94 0.90 0.86 0.83 0.79 0.76 0.73 0.71 0.68 0.65 0.63 0.61 0.59 0.57 0.55 0.53 4.42 3.88 3.44 3.07 2.77 2.51 2.29 2.10 1.94 1.79 1.66 1.55 1.44 1.35 1.27 1.19 1.12 1.06 1.00 0.95 0.90 0.86 0.82 0.78 0.74 0.71 0.68 0.65 0.62 0.60 0.57 0.55 0.53 0.51 0.49 0.47 0.46 0.44 0.43 0.41 0.40 3.53 3.10 2.75 2.46 2.22 2.01 1.83 1.68 1.55 1.43 1.33 1.24 1.15 1.08 1.01 0.95 0.90 0.85 0.80 0.76 0.72 0.69 0.65 0.62 0.59 0.57 0.54 0.52 0.50 0.48 0.46 0.44 0.42 0.41 0.39 0.38 0.36 0.35 0.34 0.33 0.32 2.94 2.58 2.29 2.05 1.85 1.68 1.53 1.40 1.29 1.19 1.11 1.03 0.96 0.90 0.84 0.79 0.75 0.71 0.67 0.63 0.60 0.57 0.54 0.52 0.49 0.47 0.45 0.43 0.41 0.40 0.38 0.37 0.35 0.34 0.33 0.32 0.30 0.29 0.28 0.27 0.26
Notes: Thickness mils Plating Thickness Plating Thermal Conductivity 3.98 W/cm Fill Conductivity 0.51 W/cm
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers Table Thermal Resistance Solder Filled, Plated Through Hole Plating Thickness
(Mils) Thermal Resistance (C/Watt) Plating 122.0 1.08.5 97.6 88.7 81.3 75.1 69.7 65.1 61.0 57.4 54.2 51.4 48.8 46.5 44.4 42.4 40.7 39.0 37.5 36.2 34.9 33.7 32.5 31.5 30.5 29.6 28.7 27.9 27.1 26.4 25.7 25.0 24.4 23.8 23.2 22.7 22.2 21.7 21.2 20.8 20.3 Fill 1692.8 1243.7 952.2 752.3 609.4 503.6 423.2 360.6 310.9 270.8 238.0 210.9 188.1 168.8 152.3 138.2 125.9 115.2 105.8 97.5 90.1 83.6 77.7 72.5 67.7 63.4 59.5 56.0 52.7 49.7 47.0 44.5 42.2 40.1 38.1 36.3 34.5 33.0 31.5 30.1 28.8 Combined 113.81 99.76 88.53 79.37 71.76 65.34 59.86 55.13 51.00 47.37 44.17 41.31 38.75 36.45 34.36 32.47 30.74 29.16 27.71 26.37 25.14 24.00 22.94 21.95 21.03 20.17 19.37 18.61 17.90 17.24 16.61 16.02 15.46 14.93 14.43 13.96 13.51 13.08 12.67 12.29 11.92 11.38 9.98 8.85 7.94 7.18 6.53 5.99 5.51 5.10 4.74 4.42 4.13 3.88 3.64 3.44 3.25 3.07 2.92 2.77 2.64 2.51 2.40 2.29 2.19 2.10 2.02 1.94 1.86 1.79 1.72 1.66 1.60 1.55 1.49 1.44 1.40 1.35 1.31 1.27 1.23 1.19 5.69 4.99 4.43 3.97 3.59 3.27 2.99 2.76 2.55 2.37 2.21 2.07 1.94 1.82 1.72 1.62 1.54 1.46 1.39 1.32 1.26 1.20 1.15 1.10 1.05 1.01 0.97 0.93 0.90 0.86 0.83 0.80 0.77 0.75 0.72 0.70 0.68 0.65 0.63 0.61 0.60 Multiple Vias 3.79 3.33 2.95 2.65 2.39 2.18 2.00 1.84 1.70 1.58 1.47 1.38 1.29 1.21 1.15 1.08 1.02 0.97 0.92 0.88 0.84 0.80 0.76 0.73 0.70 0.67 0.65 0.62 0.60 0.57 0.55 0.53 0.50 0.48 0.47 0.45 0.44 0.42 0.41 0.40 2.85 2.49 2.21 1.98 1.79 1.63 1.50 1.38 1.27 1.18 1.10 1.03 0.97 0.91 0.86 0.81 0.77 0.73 0.69 0.66 0.63 0.60 0.57 0.55 0.53 0.50 0.48 0.47 0.45 0.43 0.42 0.40 0.39 0.37 0.36 0.35 0.34 0.33 0.32 0.31 0.30 2.28 2.00 1.77 1.59 1.44 1.31 1.20 1.10 1.02 0.95 0.88 0.83 0.78 0.73 0.69 0.65 0.61 0.58 0.55 0.53 0.50 0.48 0.46 0.44 0.42 0.40 0.39 0.37 0.36 0.34 0.33 0.32 0.31 0.30 0.29 0.28 0.27 0.26 0.25 0.25 0.24 1.90 1.66 1.48 1.32 1.20 1.09 1.00 0.92 0.85 0.79 0.74 0.69 0.65 0.61 0.57 0.54 0.51 0.49 0.46 0.44 0.42 0.40 0.38 0.37 0.35 0.34 0.32 0.31 0.30 0.29 .028 0.27 0.26 0.25 0.24 0.23 0.23 0.22 0.21 0.20 0.20
Notes: Thickness mils Plating Thickness mils Plating Thermal Conductivity 3.98 W/cm Fill Conductivity 0.51 W/cm
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers
PRECAUTIONS
following precautions easily implemented will assure quality, high reliability product. ACA0861 contains very high frequency transistors inside package. These transistors, like high-speed transistors, susceptible damage ESD. Currently, ACA0861 damaged with voltages greater than Volts. avoid damage devices ESD, take following precautions: Always wear wrist strap when handling devices. This good practice when handling electronic device. Limit exposure during storage mounting using proper handling storage techniques. Transients Bias Lines ACA0861 amplifiers damaged large voltage transients bias lines. These transients generated suddenly connecting, shorting, disconnecting bias devices. This causes rapid change supply current results very large voltage transients bias lines. This mainly rapid change current through circuit inductance *dI/dt). reduce voltage transients, take following precaution: addition Transient Voltage Suppressor (TVS) bias line. This part should located between location power supply discontinuity device, closer device better. part should selected with nominal breakdown voltage 15VDC. 500W Series SAXX from work this application. surface mount version also available from series SMBG SMBJ TVS. required bias discontinuities expected. bias line decoupling capacitors will prevent voltage transients from damaging devices. When using multiple ACA0861 devices single design, single used protect
devices placement between bias discontinuity devices. Transients Outputs series Line Amplifiers damaged large voltage transients appearing output device. These transients result lightening, ESD, other phenomenon. simple diode circuit added output stage device offers greatly improved protection devices. protection circuit consists diodes placed across outputs, shown Figure return choke required through port balun. circuit operation follows: Both diodes reverse biased bias voltage appearing output pins devices. When negative transient voltage levels exceed Volts diode will become forward biased current will flow through diode. When current being conducted diode resistance diode reduced. This "shorts" outputs together. Since outputs degrees phase transient signal cancelled. This does effect normal operation device since normal output voltage levels exceed volts. Mounting These devices high power dissipation surface mount components require well-designed thermal mount. heat generated device expected removed through bottom heat slug with thermal resistance path chassis.
CONCLUSION
new, quite different, approach available CATV design engineers. This approach allows creative designs that outperform present CATV hybrids lower overall cost both hybrid assembly which substantial overall cost savings. package allows fully automated assembly positions companies expanding bandwidths beyond GHz.
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers
ACA0861
ACA0861
12dB
12dB
390n
.01uF
12dB
12dB
390nH
5.6K 3900 ppm/°C
5.6K +1400 ppm/°C 1400 ppm/oC
Notes: 1320-011. (Alpha Industries) used return
Figure Power Doubler with Surge Suppression Circuit
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers
NOTES
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers
NOTES
Application Note 08/2001
ACA0861 750/860 CATV Line Amplifiers
ANADIGICS, Inc.
Mount Bethel Road Warren, Jersey 07059, U.S.A. Tel: (908) 668-5000 Fax: (908) 668-5132 URL: http://www.anadigics.com E-mail: Mktg@anadigics.com IMPORTANT NOTICE
ANADIGICS, Inc. reserves right make changes products discontinue product time without notice. product specifications contained Advanced Product Information sheets Preliminary Data Sheets subject change prior product's formal introduction. Information Data Sheets have been carefully checked assumed reliable; however, ANADIGICS assumes responsibilities inaccuracies. ANADIGICS strongly urges customers verify that information they using current before placing orders.
WARNING
ANADIGICS products intended life support appliances, devices systems. ANADIGICS product such application without written consent prohibited.
Application Note 08/2001
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