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| Linear Driver for PIN Diode Attenuators V 4.00 DR65-0002 Features n n n n n n n n SOW-16 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 SOW-16, Wide Body Plastic Package Test Boards are Available Tape and Reel Packaging Available 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. Package outline conforms to JEDEC standard MS-013AA www..com 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 (< 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. Figure 1 RFin +Vcc C1 .01 F R1 14 4 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 Linear Driver for PIN Diode Attenuators DR65-0002 V 4.00 Electrical Specifications, TA = +25C, Reference Figure 1 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 -- Typical -- 5.0 5 1.0 2.5 7.5 50 Max -- 12 -- 2.0 -- 10 -- Figure 2--Typical Attenuation Error LINEARITY ERROR DR65-0002 Driver with AT10-0017 Attenuator 2 1.5 1 Attenuation Error 0.5 0 0 -0.5 -1 -1.5 -2 Frequency: 1960 MHz Vcont: 0 to 4.0V Absolute Maximum Ratings 1 Parameter +VCC Input + REF Output Current Operating Temperature Absolute Maximum +20 V 5V 5V 20 mA -40C to +85C -65C to +125C 150 mW 300C for 10 seconds 3 6 9 12 15 18 21 24 27 30 Storage Temperature Package Power Dissipation Lead Temperature Attenuation (dB) 1. Operation of this device above any one of these parameters may cause permanent damage. Pin Configuration Pin # 1 2 3 4 5 6 7 8 Function N/C N/C REF INPUT + GND N/C N/C N/C Pin # 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 DR65-0002-TBP Package Bulk Packaging Tape & Reel (1K Reel) Test Board with Circuit per Figure 1 (AT10-0009, GSM Attenuator) Test Board with Circuit per Figure 1 (AT10-0017, PCS Attenuator) Specifications subject to change without notice. n North America: Tel. (800) 366-2266 n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. 2 |
Price & Availability of DR65-0002
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