Features: ` Frequency Range: 10MHz to 6GHz
` Accurate Power Measurement of High Crest Factor (Up to 12dB) Waveforms
` 40dB Log Linear Dynamic Range
` Exceptional Accuracy Over Temperature
` Fast Response Time: 1s Rise, 8s Fall
` Low Power: 1.4mA at 3.3V
` Log-Linear DC Output vs Input RF Power in dBm
` Small 3mm * 2mm 8-Pin DFN Package
` Single-Ended RF InputApplication· GSM/EDGE, CMDA, CDMA2000, W-CDMA, LTE, WiMAX RF Power Control
· Pico-Cells, Femto-Cells RF Power Control
· Wireless Repeaters
· CATV/DVB Transmitters
· MIMO Wireless Access Points
· Portable RMS Power Measurement InstrumentationPinout
SpecificationsSupply 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
Operating Temperature Range................ 40 to 85
Storage Temperature Range ................ 65 to 150
CAUTION: This part is sensitive to electrostatic discharge. It is very important that proper ESD precautions be observed when handling the LT5581.
DescriptionThe 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, TDSCDMA, UMTS, LTE and WiMAX, etc. The fi nal DC output is connected in series with an on-chip 300 resistor, which enables further fi ltering of the output modulation ripple with just a single off-chip capacitor.
LT5581 Data Sheet
