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PDF ADL5501 Data sheet ( Hoja de datos )
| Número de pieza | ADL5501 | |
| Descripción | RMS Responding Detector | |
| Fabricantes | Analog Devices | |
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PRELIMINARY TECHNICAL DATA
FEATURES
True rms response
Excellent temperature stability
Up to 30 dB input dynamic range at 4 GHz
50 Ω input impedance
1.25 V rms, +15 dBm, maximum input
Single-supply operation: 2.7 V to 5.5 V
Low power: 3 mW at 3 V supply
RoHS Compliant
APPLICATIONS
Measurement of CDMA, CDMA2000, W-CDMA, and
QPSK/QAM-based OFDM, and other complex modulation
waveforms
RF transmitter or receiver power measurement
50 MHz to 4 GHz
TruPwr™ Detector
ADL5501
FUNCTIONAL BLOCK DIAGRAM
RFIN
ADL5501
i
x2
TRANS-
CONDUCTANCE
CELLS
i
x2
INTERNAL FILTER
CAPACITOR
VPOS
FLTR
ERROR
AMP
BUFFER
VRMS
100Ω
BAND-GAP
REFERENCE
Figure 1.
ENBL
COMM
GENERAL DESCRIPTION
The ADL5501 is a mean-responding power detector for use in
high frequency receiver and transmitter signal chains from
50 MHz to 4 GHz. It is easy to apply, requiring only a single
supply between 2.7 V and 5.5 V and a power supply decoupling
capacitor. The input is internally ac-coupled and has a nominal
input impedance of 50 Ω. The output is a linear-responding dc
voltage with a conversion gain of 6.6 V/V rms at 900 MHz.
The ADL5501 is intended for true power measurement of
simple and complex waveforms. The device is particularly
useful for measuring high crest factor (high peak-to-rms ratio)
signals, such as CDMA, CDMA2000, W-CDMA, and
QPSK/QAM-based OFDM waveforms. The on-chip
modulation filter provides adequate averaging for most
waveforms. The on-chip, 100 Ω series resistance at the output
combined with an external shunt capacitor creates a low-pass
filter response that reduces the residual ripple in the dc output
voltage. For more complex waveforms, an external capacitor at
the FLTR pin can be used for supplementary signal
demodulation.
The ADL5501 offers excellent temperature stability across a 30
dB range and near 0 dB measurement error across temperature
over the top portion of the dynamic range. In addition to its
temperature stability, the ADL5501 offers low process variations
which further reduces calibration complexity.
The ADL5501 operates from −40°C to +85°C and is available in
a 6-lead, 2.0 mm × 2.1 mm SC-70 package. It is fabricated on a
proprietary high fT silicon bipolar process.
Rev. PrB
05/05/2006
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2006 Analog Devices, Inc. All rights reserved.
1 page  
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PRELIMINARY TECHNICAL DATA
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADL5501
VPOS 1
6 VRMS
ADL5501
FLTR 2 TOP VIEW 5 ENBL
(Not to Scale)
RFIN 3
4 COMM
Figure 2. 6-Lead SC-70 Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1
VPOS
Supply Voltage Pin. Operational range 2.7 V to 5.5 V.
2 FLTR Modulation Filter Pin. Connection for an External Capacitor to lower the corner frequency of the modulation filter.
Capacitor is connected between FLTR and VS. The on-chip filter is approximately TBD pF. For simple waveforms,
no further filtering of the demodulated signal is required.
3 RFIN Signal Input Pin. Internally ac-coupled after internal termination resistance. Nominal 50 Ω input impedance.
4
COMM
Device Ground Pin.
5
ENBL
Enable Pin. Connect Pin to VS for Normal Operation. Connect pin to ground for disable mode for a supply current
less than 1 μA.
6
VRMS
Output Pin. Rail-to-rail voltage output with limited 3 mA current drive capability. The output has an internal
100 Ω series resistance. High resistive loads are recommended to preserve output swing.
Rev. PrB | Page 5 of 13
5 Page 
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PRELIMINARY TECHNICAL DATA
ADL5501
Figure 24. Layout of Component Side
Figure 26. Silkscreen of Component Side
Figure 25. Layout of Circuit Side
Figure 27. Silkscreen of Circuit Side
Rev. PrB | Page 11 of 13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ADL5501.PDF ] | |
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