Datasheet ADL5511 (Analog Devices)

DC to 6 GHz Envelope and TruPwr RMS Detector Data Sheet ADL5511 FEATURES FUNCTIONAL BLOCK DIAGRAM Envelope tracking RF detector with output proportional to VPOS 15 input voltage ADL5511 Separate TruPwr rms output 400Ω 20pF BIAS AND POWER- No balun or external tuning required ENBL 4 14 FLT4 DOWN CONTROL Excellent temperature stability 100Ω G = 1.7 11 VRMS Input power dynamic range of 47 dB RMS Input frequency range from dc to 6 GHz RFIN 2 10kΩ 250Ω 130 MHz envelope bandwidth ENVELOPE G = 1.5 10 VENV FLT1 3 Envelope delay: 2 ns 5pF 250Ω 9 EREF Single-supply operation: 4.75 V to 5.25 V 400Ω 0.8pF 0.4pF Supply current: 21.5 mA VPOS VPOS Power-down mode: 130 μW 13 6 7 8 12 16 1 5
01 -0
FLT2 FLT3 COMM APPLICATIONS NC
09602 Figure 1.
RMS power and envelope detection of W-CDMA, CDMA2000, LTE, and other complex waveforms Drain modulation based power amplifier linearization CH1 HIGH VRMS 20mV Power amplifier linearization employing envelope-tracking methods VENV RF INPUT
002
CH1 200mV Ω CH2 30.8mV Ω M 100ns A CH4 1.60V
2-
CH3 200mV CH4 234mV Ω T –68ns
0960 Figure 2. RMS and Envelope Response to a 20 MHz QPSK-Based LTE Carrier (Test Model E-TM1_1_20MHz)
GENERAL DESCRIPTION
The ADL5511 is an RF envelope and TruPwr™ rms detector. The ADL5511 can operate from dc to 6 GHz on signals with The envelope output voltage is presented as a voltage that is envelope bandwidths up to 130 MHz. proportional to the envelope of the input signal. The rms The extracted envelope can be used for RF power amplifier output voltage is independent of the peak-to-average ratio (PA) linearization and efficiency enhancements and the rms of the input signal. output can be used for rms power measurement. The high rms The rms output is a linear-in-V/V voltage with a conversion accuracy and fast envelope response are particularly useful for gain of 1.9 V/V rms at 900 MHz. The envelope output has a envelope detection and power measurement of broadband, high conversion gain of 1.46 V/V at 900 MHz and is referenced to peak-to-average signals that are used in CDMA2000, W-CDMA, an internal 1.1 V reference voltage, which is available on the and LTE systems. EREF pin. The ADL5511 operates from −40°C to +85°C and is available in a 16-lead, 3 mm × 3 mm LFCSP package.
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Document Outline Features Applications Functional Block Diagram General Description Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Circuit Description Envelope Propagation Delay RMS Circuit Description RMS Filtering Output Drive Capability and Buffering Viewing the Envelope on an Oscilloscope Applications Information Basic Connections Operation Below 1 GHz/Envelope Filtering Choosing a Value for the RMS Averaging Capacitor (CFLT4) Envelope Tracking Accuracy Time Domain Envelope Tracking Accuracy VRMS and VENV Output Offset Device Calibration and Error Calculation Error vs. Frequency Evaluation Board Outline Dimensions Ordering Guide