LMV225 Datasheet | National Semiconductor

Description The LMV225/LMV226/LMV228 are 30 d B RF power detectors intended for use in CDMA and WCDMA applications. The device has an RF frequency range from 450 MHz to 2 GHz. It provides an accurate temperature and supply pensated output voltage that relates linearly to the RF input power in d Bm. The circuit operates with a single supply from 2.7V to 5.5V. The LMV225/LMV226/LMV228 have an integrated filter for low-ripple average power detection of CDMA signals with 30 d B dynamic range. Additional filtering can be applied using a single external capacitor. The LMV225 has an RF power detection range from - 30 d Bm to 0 d Bm and is ideally suited for direct use in bination with resistive taps. The LMV226/LMV228 have a detection range from - 15 d Bm to 15 d Bm and are intended for use in bination with a directional coupler. The LMV226 is equipped with a buffered output which makes it suitable for GSM, EDGE, GPRS and TDMA applications. The device is active for Enable = HI, otherwise it is in a low power consumption shutdown mode. During shutdown the output will be LOW. The output voltage ranges from 0.2V to 2V and can be scaled down to meet ADC input range requirements. The LMV225/LMV226/LMV228 power detectors are offered in the small 1.0 mm x 1.0 mm X 0.6 mm micro SMD package. The LMV225 and the LMV228 are also offered in the 2.2 mm x 2.5 mm x 0.8 mm LLP package. Features n n n n n n 30 d B linear in d B power detection range Output voltage range 0.2 to 2V Logic low shutdown Multi-band operation from 450 MHz to 2000 MHz Accurate temperature pensation Packages: - micro SMD package 1.0 mm x 1.0 mm x 0.6 mm - LLP package 2.2 mm x 2.5 mm x 0.8 mm (LMV225 and LMV228) Applications n n n n CDMA RF power control WCDMA RF power control CDMA2000 RF power control PA modules Typical Application LMV225 LMV226/LMV228 20076001 20076046 © 2005 National Semiconductor Corporation DS200760 .national. LMV225/LMV226/LMV228 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified...