LMV221

更新时间： 2024-11-21 04:19:59

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
32页	2936K
描述
50 MHz to 3.5 GHz 40 dB Logarithmic Power Detector for

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LMV221 数据手册

December 2006

LMV221

50 MHz to 3.5 GHz 40 dB Logarithmic Power Detector for

CDMA and WCDMA

General Description

Features

The LMV221 is a 40 dB RF power detector intended for use

in CDMA and WCDMA applications. The device has an RF

frequency range from 50 MHz to 3.5 GHz. It provides an ac-

curate temperature and supply compensated output voltage

that relates linearly to the RF input power in dBm. The circuit

operates with a single supply from 2.7V to 3.3V.

40 dB linear in dB power detection range

■

Output voltage range 0.3 to 2V

Shutdown

Multi-band operation from 50 MHz to 3.5 GHz

0.5 dB accurate temperature compensation

External configurable output filter bandwidth

The LMV221 has an RF power detection range from −45 dBm

to −5 dBm and is ideally suited for direct use in combination

with a 30 dB directional coupler. Additional low-pass filtering

of the output signal can be realized by means of an external

resistor and capacitor. Figure (a) shows a detector with an

additional output low pass filter. The filter frequency is set with

R_Sand C_S.

2.2 mm x 2.5 mm x 0.8 mm LLP 6 package

Applications

UMTS/CDMA/WCDMA RF power control

■

GSM/GPRS RF power control

Figure (b) shows a detector with an additional feedback low

pass filter. Resistor R_Pis optional and will lower the Trans

impedance gain (R_TRANS). The filter frequency is set with

PA modules

IEEE 802.11b, g (WLAN)

C_P//C_TRANSand R_P//R_TRANS

The device is active for Enable = High, otherwise it is in a low

power consumption shutdown mode. To save power and pre-

vent discharge of an external filter capacitance, the output

(OUT) is high-impedance during shutdown.

The LMV221 power detector is offered in the small 2.2 mm x

2.5 mm x 0.8 mm LLP package.

Typical Application

(a) LMV221 with output RC Low Pass Filter

(b) LMV221 with feedback (R)C Low Pass Filter

20173771

20173704

201737

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