Datasheet ADL5906 (Analog Devices)

10 MHz to 10 GHz 67 dB TruPwr Detector Data Sheet ADL5906 FEATURES FUNCTIONAL BLOCK DIAGRAM Accurate rms-to-dc conversion from 10 MHz to 10 GHz VPOS1 VPOS2 3 10 Single-ended ±1.0 dB dynamic range: 67 dB at 2.14 GHz ADL5906 TEMPERATURE 8 VTEMP No balun or external input matching required SENSOR Response independent of waveform types, such as GSM-EDGE/CDMA/W-CDMA/TD-SCDMA/WiMAX/LTE RFIN+ 14 ISQR Logarithmic slope: 55 mV/dB X2 RFIN– 15 7 VSET Temperature stability: <±1 dB from −40°C to +125°C LINEAR-IN-dB VGA (NEGATIVE SLOPE) Operating temperature: −55°C to +125°C X2 ITGT Supply voltage: 4.75 V to 5.25 V NIC 2 6 G = 5 VRMS Sleep current: 250 µA 16 Pin compatible with ADL5902 an d AD8363 NIC BIAS AND POWER VREF NIC 13 DOWN CONTROL 2.3V 5 CRMS APPLICATIONS EPAD 26pF 11 12 Power amplifier linearization/control loops 1 9 4
001
TADJ/ VREF VTGT GND2 GND1 Transmitter signal strength indication (TSSI) PWDN
1287- 1
RF instrumentation
Figure 1.
GENERAL DESCRIPTION
The ADL5906 is a true rms responding power detector that has a Used as a power measurement device, VRMS is connected to 67 dB measurement range when driven with a single-ended 50 Ω VSET. The output is then proportional to the logarithm of the source. The easy to use input makes the ADL5906 frequency rms value of the input. In other words, the reading is presented versatile by eliminating the need for a balun or any other form directly in decibels and is scaled 1.1 V per decade, or 55 mV/dB; of external input tuning for operation up to 10 GHz. other slopes are easily arranged. In controller mode, the voltage The ADL5906 provides a solution in a variety of high frequency applied to VSET determines the power level required at the systems requiring an accurate rms measurement of signal power. input to null the deviation from the setpoint. The output buffer The ADL5906 can operate from 10 MHz to 10 GHz and can can provide high load currents. accept inputs from −65 dBm to +8 dBm with varying crest factors Requiring only a single supply of 5 V and a few capacitors, it is and bandwidths, such as GSM-EDGE, CDMA, W-CDMA, easy to use and capable of being driven single-ended or with a TD-SCDMA, WiMAX, and OFDM-based LTE carriers. In balun for differential input drive. The ADL5906 has a low 250 µA addition, its temperature stability over the broad temperature sleep current when powered down by a logic high applied to the range of −55°C to +125°C makes it ideally suited for a wide array PWDN pin. It powers up within approximately 1.4 µs to its of communications, military, industrial, and instrumentation nominal operating current of 68 mA at 25°C. applications. The ADL5906 is supplied in a 4 mm × 4 mm, 16-lead LFCSP, and it is pin compatible with the ADL5902 and the AD8363 TruPwr™ rms detectors. This feature allows the designer to create one circuit layout for projects requiring different dynamic ranges. A fully populated RoHS-compliant evaluation board is available.
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Document Outline Features Applications Functional Block Diagram General Description Table of Contents Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Square Law Detector and Amplitude Target RF Input Interface Temperature Sensor Interface VREF Interface Temperature Compensation Interface Power-Down Interface VSET Interface Output Interface VTGT Interface Basis for Error Calculations Measurement Mode Basic Connections Setting VTADJ Setting VTGT Choosing a Value for CRMS Output Voltage Scaling System Calibration and Error Calculation Using VTEMP to Improve Intercept Temperature Drift Description of Characterization Evaluation Board Evaluation Board Assembly Drawings Outline Dimensions Ordering Guide