LMH2120UM/NOPB

LMH2120 www.ti.com SNWS021C – JULY 2010 – REVISED FEBRUARY 2013 LMH2120 6 GHz Linear RMS Power Detector with 40 dB Dynamic Range Check for Samples: LMH2120 FEATURES DESCRIPTION • • • • • • • • • • The LMH2120 is a 40 dB Linear RMS power detector particularly suited for accurate power measurement of modulated RF signals that exhibit large peak-toaverage 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. 1 2 Linear Root Mean Square Response 40 dB Linear-in-V Power Detection Range Multi-Band Operation from 50 MHz to 6 GHz Lin Conformance Better than ±0.5 dB Highly Temperature Insensitive Modulation Independent Response Minimal Slope and Intercept Variation Shutdown Functionality Wide Supply Range from 2.7V to 5V Tiny 6-Bump DSBGA Package APPLICATIONS • • Multi Mode, Multi Band RF Power Control – GSM/EDGE – CDMA/CDMA2000 – W-CDMA – OFDMA – LTE Infrastructure RF Power Control The device has an RF frequency range from 50 MHz to 6 GHz. It provides an accurate, temperature and supply insensitive, output voltage that relates linearly to the RF input power in volt. The LMH2120's excellent conformance to a linear 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 LMH2120 has an RF power detection range from -35 dBm to 5 dBm and is ideally suited for use in combination with a directional coupler. Alternatively, a resistive divider can be used. 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 LMH2120 power detector is offered in a tiny 6bump DSBGA package. 10 RF COUPLER ANTENNA PA 1 VOUT (V) 50: VDD 0.1 A1 RFIN B1 A2 OUT LMH2120 EN 85°C 25°C C2 ADC 0.01 -50 -40°C -40 -30 -20 -10 0 10 RF INPUT POWER (dBm) C1, B2 GND Figure 1. Typical Application Figure 2. Output Voltage vs. RF Input Power at 1900 MHz 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2010–2013, Texas Instruments Incorporated LMH2120 SNWS021C – JULY 2010 – REVISED FEBRUARY 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) Supply Voltage VDD - GND 5.5V RF Input Input power 12 dBm DC Voltage 1V Enable (EN) Input Voltage ESD Tolerance GND-0.4V < VEN and VEN TA. All limits are ensured by test or statistical analysis. Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will also depend on the application and configuration. The typical values are not tested and are not specified on shipped production material. This parameter is ensured by design and/or characterization and is not tested in production. Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: LMH2120 3 LMH2120 SNWS021C – JULY 2010 – REVISED FEBRUARY 2013 www.ti.com 2.7 V and 4.5V DC and AC Electrical Characteristics (continued) Unless otherwise specified, all limits are ensured to TA = 25°C, VDD = 2.7V and 4.5V (worst case of the 2 is specified), RFIN= 1900 MHz CW (Continuous Wave, unmodulated). Boldface limits apply at the temperature extremes (1). Symbol Parameter Condition Min Typ (2) (3) Max (2) Units RF Detector Transfer, fit range -15 dBm to -5 dBm for Linear Slope and Intercept RFIN = 50 MHz (5) PMIN Minimum Power Level, bottom end of Dynamic Range PMAX Maximum Power Level, top end of Dynamic Range VMIN Minimum Output Voltage At PMIN 31 mV VMAX Maximum Output Voltage At PMAX 2.6 V KSLOPE Linear Slope PINT Linear Intercept VOUT = 0 dBV DR Dynamic Range for specified Accuracy RFIN = 900 MHz Log Conformance Error within ±1 dB -37 dBm 4 1 -5.7 -5.5 ±1 dB Lin Conformance Error (ELC) 37 36 41 40 ±3 dB Lin Conformance Error (ELC) 44 43 48 47 ±0.5 dB Variation over Temperature (EVOT) 41 45 dB/dB -5.3 dBm dB (5) PMIN Minimum Power Level, bottom end of Dynamic Range PMAX Maximum Power Level, top end of Dynamic Range VMIN Minimum Output Voltage At PMIN 33 VMAX Maximum Output Voltage At PMAX 2.5 V KSLOPE Linear Slope 1 dB/dB PINT Linear Intercept VOUT = 0 dBV DR Dynamic Range for specified Accuracy EMOD Input referred Variation due to Modulation Lin Conformance Error within ±1 dB -35 dBm 5 -4.2 -4.0 ±1 dB Lin Conformance Error (ELC) 36 33 40 37 ±3 dB Lin Conformance Error (ELC) 45 44 48 47 ±0.5 dB Variation over Temperature (EVOT) 41 44 ±0.3 dB Error for a 1dB Power Step (E1dB) 41 40 ±1 dB Error for a 10dB Power Step (E10dB) 45 W-CDMA Release 6/7/8, -35 dBm