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HMC980LP4E Datasheet(PDF) 8 Page - Hittite Microwave Corporation |
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HMC980LP4E Datasheet(HTML) 8 Page - Hittite Microwave Corporation |
8 / 22 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 - 8 13 HMC980LP4E ACTIVE BIAS CONTROLLER HIGH CURRENT v01.0911 Pin Descriptions (Continued) Pin Number Function Description Interface Schematic 11 VNEGFB Feedback (Control) pin for Negative Voltage Generator Charge Pump. Float to activate the negative voltage generator / Short to GND to disable the negative voltage generator. 12 VGATEFB Control pin for VGATEFB. Float VGATEFB when a depletion mode transistor is biased. Selects the mode of operation along with VNEGFB pin. 13 VG2_CONT Control voltage of the second gate pin VG2. Use a resistor divider between VDD and GND to set the volt- age. VG2 is typically 1.3V lower than the VG2CONT 14 VG2 Second gate control. 15 VNEG Negative input to the chip. Should be supplied with CPOUT when negative voltage generator is enabled, or connect to external VSS when negative voltage genera- tor is enabled. Defaults to -2.5V. If a value different than -2.5V required, please contact factory. 16 VGATE Gate Control pin for external amplifier. Connect to the gate (base) of the external amplifier. In order to guar- antee stability, a 2.2μF capacitor should be connected between the gate (base) terminal of the external ampli- fier and GND as close to the amplifier as possible. 17, 18 VDRAIN Drain voltage. Should be connected to the supply termi- nal of the external amplifier. A minimum 10 nF capacitor has to be placed close to the external amplifier to improve load regulation. |
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