Datasheet AD8361 (Analog Devices)

LF to 2.5 GHz TruPwr™ Detector Data Sheet AD8361 FEATURES FUNCTIONAL BLOCK DIAGRAMS Calibrated rms response VPOS Excellent temperature stability INTERNAL FILTER
i
RFIN
χ
2 FLTR Up to 30 dB input range at 2.5 GHz TRANS- AD8361 700 mV rms, 10 dBm, re 50 Ω maximum input CONDUCTANCE CELLS ERROR ±0.25 dB linear response up to 2.5 GHz
i
AMP
χ
2
×
7.5 Single-supply operation: 2.7 V to 5.5 V VRMS BUFFER Low power: 3.3 mW at 3 V supply ADD OFFSET Rapid power-down to less than 1 µA BAND-GAP PWDN SREF REFERENCE APPLICATIONS COMM Measurement of CDMA, W-CDMA, QAM, other complex IREF
01088-C-002
modulation waveforms
Figure 2. 8-Lead MSOP
RF transmitter or receiver power measurement VPOS INTERNAL FILTER
i
RFIN
χ
2 FLTR GENERAL DESCRIPTION TRANS- AD8361
The AD8361 is a mean-responding power detector for use in
CONDUCTANCE CELLS ERROR
high frequency receiver and transmitter signal chains, up to i
AMP
χ
2
×
7.5 VRMS BUFFER
2.5 GHz. It is very easy to apply. It requires a single supply only between 2.7 V and 5.5 V, a power supply decoupling capacitor,
BAND-GAP
and an input coupling capacitor in most applications. The
PWDN REFERENCE
output is a linear-responding dc voltage with a conversion gain
COMM
of 7.5 V/V rms. An external filter capacitor can be added to
IREF
01088-C-003 increase the averaging time constant. Figure 3. 6-Lead SOT-23
3.0 2.8 SUPPLY
The AD8361 is intended for true power measurement of simple
2.6 REFERENCE MODE
and complex waveforms. The device is particularly useful for
2.4 2.2
measuring high crest-factor (high peak-to-rms ratio) signals,
INTERNAL 2.0 REFERENCE MODE
such as CDMA and W-CDMA.
1.8 1.6
The AD8361 has three operating modes to accommodate a
1.4
variety of analog-to-digital converter requirements:
GROUND V rms (Volts) 1.2 REFERENCE MODE 1.0
1. Ground reference mode, in which the origin is zero.
0.8
2. Internal reference mode, which offsets the output 350 mV
0.6
above ground.
0.4 0.2
3. Supply reference mode, which offsets the output to VS/7.5.
0.0 0 0.1 0.2 0.3 0.4 0.5
The AD8361 is specified for operation from −40°C to +85°C
RFIN (V rms)
01088-C-001 and is available in 8-lead MSOP and 6-lead SOT-23 packages. It Figure 1. Output in the Three Reference Modes, Supply 3 V, Frequency 1.9 GHz is fabricated on a proprietary high fT silicon bipolar process. (6-Lead SOT-23 Package Ground Reference Mode Only)
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAMS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS CIRCUIT DESCRIPTION Filtering Offset APPLICATION INFORMATION Basic Connections Output Swing Dynamic Range Input Coupling and Matching Input Coupling Using a Series Resistor Selecting the Filter Capacitor Operation at Low Frequencies Power Consumption, Enable and Power-On Volts to dBm Conversion Output Drive Capability and Buffering OUTPUT REFERENCE TEMPERATURE DRIFT COMPENSATION Extended Frequency Characterization EVALUATION BOARD CHARACTERIZATION SETUPS Equipment Analysis OUTLINE DIMENSIONS ORDERING GUIDE