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HMC981 Datasheet(PDF) 7 Page - Hittite Microwave Corporation |
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HMC981 Datasheet(HTML) 7 Page - Hittite Microwave Corporation |
7 / 18 page For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 13 - 7 13 Pad Descriptions Pad Number Function Description Interface Schematic 1, 5, 8, 10, 13, 15, 20, 23, 25, 26, Die Bottom GND These pads and the die bottom must be connected to a high quality RF/DC ground. 2 EN Enable pad. System is enabled when Ven is HIGH (VDIG). If left floating, Ven defaults to HIGH (enabled). 3 SW Internal switch resistance control pad. If left floating, VSW defaults to HIGH. 12 DISBLSC Disables short circuit lock down when pulled to ground. Leave it floating to enable short circuit lock down. 4 VG2CONT Control voltage of the VG2. Use a resistor divider between VDD and GND to set the voltage. VG2 is typically 1.3V lower than the VG2CONT 19 VG2 Second gate control. 6-7, 29-30 VDD, VDIG Bias supply pan. Connect supply voltage to this pad with appropriate filtering. 9 VREF 1.5V reference voltage. 0.1uF or greater capacitor to GND is needed for noise filtering. 11 ISENSE To adjust the bias current of the external amplifier connect a resistor (Rsense) from ISENSE pad to GND. Use Eqn.2 to determine the required Rsense value. HMC981 v00.0611 ACTIVE BIAS CONTROLLER |
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