LMH2100 Datasheet | National Semiconductor

Description The LMH2100 is a 40 d B RF power detector intended for use in CDMA and WCDMA applications. The device has an RF frequency range from 50 MHz to 4 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 3.3V. The LMH2100 has an RF power detection range from - 45 d Bm to - 5 d Bm and is ideally suited for direct use in bination with a 30 d B 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 RS and CS. Figure (b) shows a detector with an additional feedback low pass filter. Resistor RP is optional and will lower the Trans impedance gain (RTRANS). The filter frequency is set with CP//CTRANS and RP//RTRANS. The device is active for Enable = High, otherwise it is in a low power consumption shutdown mode. To save power and prevent discharge of an external filter capacitance, the output (OUT) is high-impedance during shutdown. The LMH2100 power detector is offered in the small 0.4 mm pitch micro SMD package. Features - - - - - - - 40 d B linear in d B power detection range Output voltage range 0.3 to 2V Shutdown Multi-band operation from 50 MHz to 4 GHz 0.5 d B accurate temperature pensation External configurable output filter bandwidth 0.4 mm-pitch micro SMD package Applications - - - - UMTS/CDMA/WCDMA RF power control GSM/GPRS RF power control PA modules IEEE 802.11b, g (WLAN) Typical Application (a) LMH2100 with Output RC Low Pass Filter (b) LMH2100 with Feedback (R)C Low Pass Filter © 2007 National Semiconductor Corporation .national. .. Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability...