LMH2100TMX

• 40 dB linear dB power detection range
• The output voltage range is 0.3 to 2V
• Shutdown
• Multi-band operation, from 50 MHz to 4 GHz
• Precise temperature compensation of 0.5 dB
• Externally configured output filter bandwidth
• 0.4 mm pitch micro SMD package

illustrate

LMH2100 intended to use a 40 dB RF power detector in CDMA and WCDMA applications. The device has an RF frequency range from 50 MHz to 4 GHz. It provides a precise linear relationship between the temperature and power supply compensated output voltage at dBm of RF input power. The circuit operates from a single 2.7V to 3.3V supply.

LMH2100 has an RF power sense range from -45 dBm to -5 dBm, making it ideal for direct use with a 30 dB directional coupler. Additional low-pass filtered output signals can be achieved by passing through external resistance and capacitance. Figure (a) shows a detector with an additional output low-pass filter. This filter frequency setting is the same as R S and C S.

Figure (b) shows an additional feedback low-pass filter detector. The resistor R P is optional and reduces the transimpedance gain (R TRANS). CP//C Trans and R P//R Trans filter frequency settings.

The device is positive for Enable = High, otherwise it is in low power downtime mode. To save power and prevent external filtering capacitor discharge, the output (OUT) is shutdown at high impedance.

LMH2100 power detectors are available in a small 0.4 mm pitch micro SMD package.

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• UMTS/CDMA/WCDMA RF Power Control
• GSM/GPRS RF power control
• PA module
• IEEE 802.11b, G (WLAN)