DR65-0002 Linear Driver for PIN Diode Attenuators Rev. V5 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 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. 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. Pin Configuration Ordering Information Pin No. Function Pin No. Function 1 N/C 9 N/C 2 N/C 10 N/C 3 REF 11 N/C Part Number Package 4 INPUT + 12 OUTPUT DR65-0002 Bulk Packaging 5 GND 13 N/C DR65-0002TR 1000 piece reel 6 N/C 14 + VCC 7 N/C 15 N/C DR65-0002-TBG Test Board with Circuit per Figure 1 (AT10-0009, GSM Attenuator) 8 N/C 16 N/C DR65-0002-TBP Test Board with Circuit per Figure 1 (AT10-0017, PCS Attenuator) 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 Rev. V5 Figure 1. Linear Attenuator Schematic RFin +Vcc C1 .01 µF R1 2 1,3,4 16,14,13 14 4 Vcontrol (0 to 4V) IN 39K 12 ATTENNUATOR 7 DR65-0002 R2 680 REF 3 R3 (PTCT) 330 R4 5,6,8 9,11,12 5 360 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 Driver with with MAAV-007090-000100 AT10-0017 VVA MADR-007098-000100 VVA 2.0 Attenuation Error (dB) 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 0 3 Frequency: 1960 M Hz Vco nt: 0 to 4.0V 6 9 12 15 18 21 24 27 30 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 = 25°C, Z0 = 50Ω Parameter Test Conditions Units Min Typ Max Output Drive Current Load Dependent mA 10 — — +VCC Supply Range — V 3.0 5.0 12 +VCC Supply Tolerance — % — 5 — +VCC Quiescent Current No Load mA — 1.0 2.0 Linearity Application Dependent dB ±1 ± 2.5 — Transfer Function Application Dependent dB/V 3 7.5 10 Settling Time 50% Ctl to 90%/10% RF µs — 50 — Absolute Maximum Ratings 1,2 Parameter Absolute Maximum +VCC +20 V Handling Procedures Input + ±5V REF ±5V Please observe the following precautions to avoid damage: Output Current 20 mA Operating Temperature -40ºC to +85ºC Storage Temperature -65ºC to +125ºC Package Power Dissipation 150 mW Lead Temperature 300ºC for 10 seconds 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. 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. 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 Rev. V5 SOW-16† † 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.