8 GHz Logarithmic RMS Power Detector with 45 dB Dynamic Range General Description Features The LMH2110 is a 45 dB Logarithmic RMS power detector particularly suited for accurate power measurement of modulated RF signals that exhibit large peak-to-average ratios, i.e. large variations of the signal envelope. Such signals are encountered in W-CDMA and LTE cell phones. The RMS measurement topology inherently ensures a modulation insensitive measurement. The device has an RF frequency range from 50 MHz to 8 GHz. It provides an accurate, temperature and supply insensitive, output voltage that relates linearly to the RF input power in dBm. The LMH2110's excellent conformance to a logarithmic response enables an easy integration by using slope and intercept only, reducing calibration effort significantly. The device operates with a single supply from 2.7V to 5V. The LMH2110 has an RF power detection range from -40 dBm to 5 dBm and is ideally suited for use in combination with a directional coupler. Alternatively a resistive divider can be used as well. The device is active for EN = 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 LMH2110 power detector is offered in a tiny 6-bump microSMD package. “Notice: This document is not a datasheet. For more information regarding this product or to order samples please contact your local National Semiconductor sales office or visit http://www.national.com/support/dir.html. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Logarithmic root mean square response 45 dB linear-in-dB power detection range Multi-band operation from 50 MHz to 8 GHz LOG conformance better than ±0.5 dB Highly temperature insensitive, ±0.25 dB Modulation independent response, 0.08 dB Minimal Slope and Intercept variation Shutdown functionality Wide supply range from 2.7V to 5V Tiny 6-bump microSMD package Applications ■ Multi Mode, Multi band RF power control — GSM/EDGE — CDMA/CDMA2000 — W-CDMA — OFDMA — LTE ■ Infrastructure RF Power Control Typical Application 30064804 © 2010 National Semiconductor Corporation 300648 www.national.com LMH2110 PRODUCT BRIEF January 7, 2010 LMH2110 PRODUCT BRIEF LMH2110 Connection Diagram 6-Bump mircoSMD 30064805 Top View Pin Descriptions microSMD Power Supply Name Description A1 VDD Positive Supply Voltage. C1 GND Power Ground. Power Ground. May be left floating in case grounding is not feasible. B2 GND Logic Input C2 EN Analog Input B1 RFIN RF input signal to the detector, internally terminated with 50Ω. Output A2 OUT Ground referenced detector output voltage. The device is enabled for EN = High, and in shutdown mode for EN = Low. EN should be <2.5V for having low IEN. For EN >2.5V, IEN increases slightly, while device is still functional. Absolute maximum rating for EN = 3.6V. Ordering Information Package 6–Bump microSMD www.national.com Part Number LMH2110TM LMH2110TMX Package Marking P Transport Media 250 Units Tape and Reel 3k Units Tape and Reel 2 NSC Drawing Status TMD06BBA Released LMH2110 Physical Dimensions inches (millimeters) unless otherwise noted 6-Bump microSMD NS Package Number TMD06BBA X1 = 0.840 ± 0.030 mm, X2 = 1.240 ± 0.030 mm, X3 = 0.600 ± 0.075 mm 3 www.national.com LMH2110 PRODUCT BRIEF Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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