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LT5581 Dataheets PDF



Part Number LT5581
Manufacturers Linear
Logo Linear
Description 6GHz RMS Power Detector
Datasheet LT5581 DatasheetLT5581 Datasheet (PDF)

LT5581 6GHz RMS Power Detector with 40dB Dynamic Range FEATURES n Frequency Range: 10MHz to 6GHz n Accurate Power Measurement of High Crest Factor (Up to 12dB) Waveforms n 40dB Log Linear Dynamic Range n Exceptional Accuracy Over Temperature n Fast Response Time: 1μs Rise, 8μs Fall n Low Power: 1.4mA at 3.3V n Log-Linear DC Output vs Input RF Power in dBm n Small 3mm × 2mm 8-Pin DFN Package n Single-Ended RF Input APPLICATIONS n GSM/EDGE, CMDA, CDMA2000, W-CDMA, LTE, WiMAX RF Power Control n Pi.

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LT5581 6GHz RMS Power Detector with 40dB Dynamic Range FEATURES n Frequency Range: 10MHz to 6GHz n Accurate Power Measurement of High Crest Factor (Up to 12dB) Waveforms n 40dB Log Linear Dynamic Range n Exceptional Accuracy Over Temperature n Fast Response Time: 1μs Rise, 8μs Fall n Low Power: 1.4mA at 3.3V n Log-Linear DC Output vs Input RF Power in dBm n Small 3mm × 2mm 8-Pin DFN Package n Single-Ended RF Input APPLICATIONS n GSM/EDGE, CMDA, CDMA2000, W-CDMA, LTE, WiMAX RF Power Control n Pico-Cells, Femto-Cells RF Power Control n Wireless Repeaters n CATV/DVB Transmitters n MIMO Wireless Access Points n Portable RMS Power Measurement Instrumentation DESCRIPTION The LT®5581 is a 10MHz to 6GHz, low power monolithic precision RMS power detector. The RMS detector uses a proprietary technique to accurately measure the RF power from –34dBm to +6dBm (at 2.14GHz) of modulated signals with a crest factor as high as 12dB. It outputs a DC voltage in linear scale proportional to an RF input signal power in dBm. The LT5581 is suitable for precision power measurement and control for a wide variety of RF standards, including GSM/EDGE, CDMA, CDMA2000, W-CDMA, TD-SCDMA, UMTS, LTE and WiMAX, etc. The final DC output is connected in series with an on-chip 300Ω resistor, which enables further filtering of the output modulation ripple with just a single off-chip capacitor. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7342431. TYPICAL APPLICATION 10MHz to 6GHz Infrastructure Power Amplifier Level Control POWER RFIN AMP DIRECTIONAL COUPLER RFOUT DIGITAL POWER CONTROL 0.1μF ADC CFILT 0.01μF VCC 2.7VDC TO 5.25VDC 0.01μF 1 VCC 8 CSQ 1000pF 2 EN LT5581 RFIN 7 3 VOUT GND 6 4 GND GND GND 5 9 CMATCH LMATCH 50Ω 68Ω 5581 TA01a LINEARITY ERROR (dB) Linearity Error vs RF Input Power, 2140MHz Modulated Waveforms 3 TA = 25°C 2 1 0 –1 CW WCDMA, UL WCDMA DL 1C –2 WCDMA DL 4C LTE DL 1C LTE DL 4C –3 –35 –30 –25 –20 –15 –10 –5 0 RF INPUT POWER (dBm) 5 10 5581 TA01b 5581fa 1 LT5581 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage.........................................................5.5V Maximum Input Signal Power—Average .............15dBm Maximum Input Signal Power—Peak (Note 7) ....25dBm DC Voltage at RFIN ....................................... –0.3V to 2V VOUT Voltage ....................................–0.3V to VCC + 0.3V Maximum Junction Temperature, TJMAX ............... 150°C Operating Temperature Range.................. –40°C to 85°C Storage Temperature Range................... –65°C to 150°C CAUTION: This part is sensitive to electrostatic discharge. It is very important that proper ESD precautions be observed when handling the LT5581. PIN CONFIGURATION TOP VIEW VCC 1 8 CSQ EN 2 9 7 RFIN VOUT 3 6 GND GND 4 5 GND DDB PACKAGE 8-LEAD (3mm s 2mm) PLASTIC DFN TJMAX = 150°C, θJA = 76°C/W EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION LT5581IDDB#PBF LT5581IDDB#TRPBF LDKM 8-Lead (3mm × 2mm) Plastic DFN Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ TEMPERATURE RANGE –40°C to 85°C ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VCC = 3.3V, EN = 3.3V, unless otherwise noted (Note 2). Test circuit is shown in Figure 1. PARAMETER CONDITIONS MIN TYP MAX UNITS AC Input Input Frequency Range (Note 4) 10-6000 MHz Input Impedance 205||1.6 Ω||pF fRF = 450MHz RF Input Power Range Externally Matched to 50Ω Source –34 to 6 dBm Linear Dynamic Range, CW (Note 3) ±1dB Linearity Error 40 dB Linear Dynamic Range, CDMA (Note 3) ±1dB Linearity Error; CDMA 4-Carrier 40 dB Output Slope 31 mV/dB Logarithmic Intercept (Note 5) –42 dBm Output Variation vs Temperature Output Variation vs Temperature Deviation from CW Response; PIN = –34dBm to 0dBm Normalized to Output at 25˚C, –40°C < TA < 85°C; PIN = –34 to +6dBm Normalized to Output at 25°C, –40°C < TA < 85°C; PIN = –27 to –10dBm TETRA π/4 DQPSK CDMA 4-Carrier 64-Channel Fwd 1.23Mcps ±1 dB ±0.5 dB ±0.1 dB ±0.5 dB 5581fa 2 LT5581 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VCC = 3.3V, EN = 3.3V, unless otherwise noted (Note 2). Test circuit is shown in Figure 1. PARAMETER CONDITIONS 2nd Order Harmonic Distortion 3rd Order Harmonic Distortion fRF = 880MHz RF Input Power Ra.


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