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For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373

Order On-line at www.hittite.com

13 - 20

13

HMC920LP5E

v07.1013

ACTIVE BIAS CONTROLLER

Vdd Under-Voltage Alarm

The HMC920LP5E provides a low Vdd indicator signal (VddALM pin#31) when the Vdd supply voltage is lower than

an user adjustable threshold value. VddALM pin pulled down to GND when the Vdd voltage is lower than the adjusted

VddTHR value. To adjust the Vdd under-voltage alarm threshold set R6 (the resistance from VddCHK to AGND)

according to the relation provided in (6).

Power-up and Enable Sequencing

To ensure the safety of the external amplifier the HMC920LP5E provides a certain power-up sequence for enabling

active bias control loop. During start-up VDRAIN is kept at GND while VGATE is taken to the most negative supply

available (VGATE=VNEG). This ensures that external amplifier is completely turned-off before VDRAIN is applied.

When EN signal is received VDRAIN is applied and the active bias loop is enabled. The final phase of the power-up

sequence is completed by increasing the VGATE linearly until the set IDRAIN value is achieved.

For power-down and disabling the same sequencing is applied in the reverse order.

(6)

Figure 2. Current Alarm Behavior

Daisy-Chain Operation

HMC920LP5E produces a trigger out signal (TRGOUT pin#24) when the external amplifier achieves a stable bias

current (IDRAIN). This trigger signal can be used to enable additional HMC920LP5E chips in a chain of amplifiers.

The triggering sequence can be routed in anyway, from input to output, or from output to input depending on the

use. Figure-3 presents a sample use of three HMC920LP5Es in an amplifier chain. Please note that, only one of the

HMC920LP5E is used to generate the negative voltage and the remaining HMC920LP5E is set to receive external

negative voltages (which is provided from the master HMC920LP5E). Generating negative voltage only with single

HMC920LP5E reduces the number of the components in the system, and decreases the over all current consumption

slightly, compared to each bias controller generating its own negative voltage.

To ensure proper start-up, the system enable signal should ne applied to the chip that has the negative voltage

generator.

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VddTHR

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相關代理商/技術參數	參數描述
HMC920LP5ETR	制造商:Hittite Microwave Corp 功能描述:IC CTRLR ACTIVE BIAS 32QFN
HMC921LP4E	功能描述:IC AMP MMIC GASS 24QFN RoHS:是類別:RF/IF 和 RFID >> RF 放大器系列:- 標準包裝:3,000 系列:- 頻率:100MHz ~ 6GHz P1dB:9.14dBm（8.2mW）增益:15.7dB 噪音數據:1.3dB RF 型:CDMA，TDMA，PCS 電源電壓:2.7 V ~ 5 V 電流 - 電源:60mA 測試頻率:2GHz 封裝/外殼:0505（1412 公制）包裝:帶卷 (TR)
HMC921LP4ETR	制造商:Hittite Microwave Corp 功能描述:IC AMP MMIC GASS 24QFN
HMC922LP4E	制造商:Hittite Microwave Corp 功能描述:IC MMIC SWITCH SPDT DIFF 24-QFN
HMC922LP4ETR	制造商:Hittite Microwave Corp 功能描述:HMC922 Series DC - 4.0 GHz Non-Reflective Differential SPDT Switch - QFN-24

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型號：	HMC920LP5E
廠商：	Hittite Microwave Corporation
文件頁數：	20/26頁
文件大?。?/td>	1291K
描述：	IC CTRLR ACTIVE BIAS 32QFN
標準包裝：	1
功能：	有源偏壓控制器
輸入電壓：	5 V ~ 16.5 V
電流 - 輸出：	500mA
工作溫度：	-40°C ~ 85°C
安裝類型：	表面貼裝
封裝/外殼：	32-VFQFN 裸露焊盤
供應商設備封裝：	32-QFN（5x5）
包裝：	標準包裝
其它名稱：	1127-1077-6

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