HMC920LP5E v07.1013 ACTIVE BIAS CONTROLLERPin Descriptions Pin Number Function Description Interface Schematic Bias supply Pins. Connect supply voltage 1, 2 Vdd1 to all these pins with appropriate filtering. Vdd1 supply voltage should be same as Vdd2. 3.5V LDO output for internal use. Output capability <30mA. 3 VDIG Is not recommended for external use. Feedback node for VDIG LDO. Should be left floating for 4 VDIGFB regular operation. 13 External capacitor for power-on-reset signal. 47pF to 5 PORCAP GND is needed. If longer POR duration is needed, can be increased. T A resistor to ground is needed. The value of the resistor 10 ALMSET determines the alarm delay duration. The value of the M resistor can be chosen between 10K and 10M. A high precision (e.g. 0.5%, ±25 ppm TCR) 10K resistor 12 FIXBIAS to ground is needed. Variance in the resistance will cause deviation in the bias current. T - S N E M External capacitor of bandgap output. Connect a 6 BGCAP E 0.1uF or greater low ESR ceramic capacitor to GND. G A N A Enable pin. System is enabled when Ven is HIGH (3.5V). IF 7 EN left floating, Ven defaults to HIGH (enabled). R M E W Dummy alarm trigger signal to create test alarm when O 9 ALMTRG taken HIGH (3.5V). Defaults to LOW (GND) when left floating. C P D Over/under current alarm 8 CURALM (Generates an active HIGH signal). Trigger out signal. Generates a HIGH (3.5V) signal when the active bias system stabilizes. This signal can be 24 TRGOUT used to trigger next device (ENABLE) if more than one HMC920LP5E is used in a daisy chain. 31 VddALM Generates an active LOW signal if Vdd1 drops below 3.5V. Information furnish F e o d r p by A rnic alo e g , d Devi ecleis vie s rby eli, a eve nd t d to b o p e a l cc a ur c at e o e an r d d releiars ble , p . Ho le we a ve sr, e c no For price, delivery, and to place orders: Analog Devices, Inc., responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other ontact Hittite Microwave Corporation: One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 20 Alpha Road, Chelmsford, MA 01824 Phone rights of third parties that may result from its use. Specifications subject to change without notice. No : 9P7 h 8 o - n 2 e 5 : 7 0- 81- 3 3 3 2 4 9- 3 F 470 ax: 9 0 • Ord 7 e 8 r o - n 2 li 5 n 0 e a-t 337 ww 3 13 - 7 license is granted by implication or otherwise under any patent or patent rights of Analog Devices. w.analog.com Order On- Trademarks and registered trademarks are the property of their respective owners. line at www.hi A tptiptliec.actio o m n Support: Phone: 1-800-ANALOG-D
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