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| DR65-0002 Linear Driver for PIN Diode Attenuators Features * Linearizes PIN Diode Attenuators Over a Wide Attenuation Range * Output Currents up to 12 mA * Operates with a Single Supply Voltage of +3V to +12V * Low Quiescent Currents * Single Control Voltage * Test Boards are Available * Tape and Reel Packaging Available * SOW-16 Package Rev. V5 Circuit Description: (Reference Figures 1 and 2) The input divider, R1 and the sum of R2 and R3, sets the overall transfer function of the circuit. To increase the transfer function, decrease the Control Voltage and the value of R1. Varying the value of R4 will optimize the linearity of the circuit. One can achieve a very linear transfer function (less than 1 dB/V) by driving the attenuator over a smaller portion of its dynamic range. In the case of the AT10-0009 and AT10-0017 attenuators, this would be limited to a dynamic range of 28 and 25 dB, respectively. Temperature compensation is a function temperature coefficient of the thermistor, R3, and the ratio of R2 to R3, and can only be optimized once the transfer function and linearity component values have been established. Description M/A-COM's DR65-0002 is a break point free driver that produces a logarithmic output current suitable for linearizing PIN diode based shunt attenuators. This driver, in conjunction with customer defined external components, produces a linear transfer function (dB/V) between the input control voltage of the driver and the attenuation output of the PIN attenuator. The DR65-0002 has been optimized for linearizing M/A-COM's AT10-0009 or AT10-0017 attenuators, but will function well with most types of cathode grounded, PIN attenuators. The driver is packaged in a SOW-16 package for commercial SMT applications. A typical schematic for a 30 dB, 7.5 dB/V linear attenuator is shown in Figure 1. Pin Configuration Pin No. 1 2 Function N/C N/C REF INPUT + GND N/C N/C N/C Pin No. 9 10 11 12 13 14 15 16 Function N/C N/C N/C OUTPUT N/C + VCC N/C N/C Ordering Information Part Number DR65-0002 DR65-0002TR DR65-0002-TBG 3 Package Bulk Packaging 1000 piece reel Test Board with Circuit per Figure 1 (AT10-0009, GSM Attenuator) Test Board with Circuit per Figure 1 (AT10-0017, PCS Attenuator) 4 5 6 7 8 DR65-0002-TBP Note: Reference Application Note M513 for reel size information. 1 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions * North America Tel: 800.366.2266 * Europe Tel: +353.21.244.6400 is considering for development. Performance is based on target specifications, simulated results, * India Tel: +91.80.4155721 * China Tel: +86.21.2407.1588 and/or prototype measurements. Commitment to develop is not guaranteed. Visit www.macomtech.com for additional data sheets and product information. PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology Solutions has under development. Performance is based on engineering tests. Specifications are typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available. M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make Commitment to produce in volume is not guaranteed. changes to the product(s) or information contained herein without notice. DR65-0002 Linear Driver for PIN Diode Attenuators Figure 1. Linear Attenuator Schematic RFin +Vcc C1 .01 F R1 14 4 Rev. V5 2 1,3,4 16,14,13 Vcontrol (0 to 4V) 39K IN 12 7 ATTENNUATOR DR65-0002 R2 680 REF 3 5 5,6,8 9,11,12 R3 (PTCT) 330 R4 360 10 RFoutput NOTES: TRANSFER FUNCTION IS 7.5 dB/V Vcontrol IS 0V to 4.0V +Vcc IS 5.0V 5% R3 IS A POSITIVE TEMPERATURE COEFFICIENT THERMISTOR ATTENUATOR IS AT10-0009 OR AT10-0017 SCHEMATIC LINEAR ATTENUATOR Figure 2. Typical Attenuation Error DR65-0002 Driver with AT10-0017 VVA MADR-007098-000100 Driver with MAAV-007090-000100 VVA 2.0 1.5 Attenuation Error (dB) 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 0 3 6 9 12 15 18 21 24 27 30 Frequency: 1 960 M Hz Vco nt: 0 to 4.0V Attenuation (dB) 2 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions * North America Tel: 800.366.2266 * Europe Tel: +353.21.244.6400 is considering for development. Performance is based on target specifications, simulated results, * India Tel: +91.80.4155721 * China Tel: +86.21.2407.1588 and/or prototype measurements. Commitment to develop is not guaranteed. Visit www.macomtech.com for additional data sheets and product information. PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology Solutions has under development. Performance is based on engineering tests. Specifications are typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available. M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make Commitment to produce in volume is not guaranteed. changes to the product(s) or information contained herein without notice. DR65-0002 Linear Driver for PIN Diode Attenuators Rev. V5 Electrical Specifications: TA = 25C, Z0 = 50 Parameter Output Drive Current +VCC Supply Range +VCC Supply Tolerance +VCC Quiescent Current Linearity Transfer Function Settling Time Test Conditions Load Dependent -- -- No Load Application Dependent Application Dependent 50% Ctl to 90%/10% RF Units mA V % mA dB dB/V s Min 10 3.0 -- -- 1 3 -- Typ -- 5.0 5 1.0 2.5 7.5 50 Max -- 12 -- 2.0 -- 10 -- Absolute Maximum Ratings 1,2 Parameter +VCC Input + REF Output Current Operating Temperature Storage Temperature Package Power Dissipation Lead Temperature Absolute Maximum +20 V 5V 5V 20 mA -40C to +85C -65C to +125C 150 mW 300C for 10 seconds Handling Procedures Please observe the following precautions to avoid damage: Static Sensitivity Gallium Arsenide Integrated Circuits are sensitive to electrostatic discharge (ESD) and can be damaged by static electricity. Proper ESD control techniques should be used when handling these devices. 1. Exceeding any one or combination of these limits may cause permanent damage to this device. 2. M/A-COM does not recommend sustained operation near these survivability limits. 3 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions * North America Tel: 800.366.2266 * Europe Tel: +353.21.244.6400 is considering for development. Performance is based on target specifications, simulated results, * India Tel: +91.80.4155721 * China Tel: +86.21.2407.1588 and/or prototype measurements. Commitment to develop is not guaranteed. Visit www.macomtech.com for additional data sheets and product information. PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology Solutions has under development. Performance is based on engineering tests. Specifications are typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available. M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make Commitment to produce in volume is not guaranteed. changes to the product(s) or information contained herein without notice. DR65-0002 Linear Driver for PIN Diode Attenuators SOW-16 Rev. V5 Reference Application Note M538 for lead-free solder reflow recommendations. 4 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions * North America Tel: 800.366.2266 * Europe Tel: +353.21.244.6400 is considering for development. Performance is based on target specifications, simulated results, * India Tel: +91.80.4155721 * China Tel: +86.21.2407.1588 and/or prototype measurements. Commitment to develop is not guaranteed. Visit www.macomtech.com for additional data sheets and product information. PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology Solutions has under development. Performance is based on engineering tests. Specifications are typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available. M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make Commitment to produce in volume is not guaranteed. changes to the product(s) or information contained herein without notice. |
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