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ADRF6518ACPZ-R7 데이터시트(PDF) 1 Page - Analog Devices

부품명 ADRF6518ACPZ-R7
상세설명  63 MHz Dual Programmable Filters and Variable Gain Amplifiers
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63 MHz Dual Programmable Filters and
Variable Gain Amplifiers
Preliminary Technical Data
ADRF6518
Rev. PrA
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
Matched pair of programmable filters and triple VGAs
Continuous gain control range: 72 dB
Digital gain control: 30 dB
6-pole Butterworth filter: 1 MHz to 63 MHz
in 1 MHz steps, 1 dB corner frequency
Preamplifier and postamplifier gain steps
Peak detector
Filter bypass mode, −3 dB bandwidth (BW)
VGA2 and VGA3 21 dB/12 dB gain: 350 MHz/700 MHz
IMD3: >65 dBc for 1.5 V p-p composite output
HD2, HD3: >65 dBc for 1.5 V p-p output
Differential input and output
Flexible output and input common-mode ranges
Optional dc output offset correction
SPI programmable filter corners and gain steps
Single 3.3 V supply operation with power-down feature
APPLICATIONS
Baseband I/Q receivers
Diversity receivers
ADC drivers
Point-to-point and point-to-multipoint radios
Instrumentation
Medical
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
GENERAL DESCRIPTION
The ADRF6518 is a matched pair of fully differential low noise and
low distortion programmable filters and variable gain amplifiers
(VGAs). Each channel is capable of rejecting large out-of-band
interferers while reliably boosting the wanted signal, thus reducing
the bandwidth and resolution requirements on the analog-to-
digital converters (ADCs). The excellent matching between
channels and their high spurious-free dynamic range over all
gain and bandwidth settings make the ADRF6518 ideal for
quadrature-based (IQ) communication systems with dense
constellations, multiple carriers, and nearby interferers. The
various amplifier gains, filter corners and other features are all
programmable via a serial port interface (SPI) port.
The first VGA that precedes the filters offers 24 dB of continuous
gain control with fixed gain options of 9 dB, 12 dB, and 15 dB, and
sets a differential input impedance of 400 Ω. The filters provide
a six-pole Butterworth response with 1 dB corner frequencies
from 1 MHz to 63 MHz in 1 MHz steps. For operation beyond
63 MHz, the filter can be disabled and completely bypassed via
the SPI. A wideband peak detector is available to monitor the
peak signal at the filter inputs. The pair of VGAs that follow the
filters each provides 24 dB of continuous gain control with fixed
gain options of 12 dB, 15 dB, 18 dB, and 21 dB. The output buffers
offer an additional option of 3 dB or 9 dB gain and provide a
differential output impedance of less than 10 Ω. They are
capable of driving 3 V p-p into 1 kΩ loads at better than 65 dBc
HD3. The output common-mode voltage defaults to VPS/2 and
can be adjusted down to 900 mV by driving the high impedance
VOCM pin. Independent, built-in dc offset correction loops for
each channel can be disabled via the SPI if fully dc-coupled
operation is desired. The high-pass corner frequency is deter-
mined by external capacitors on the OFS1 and OFS2 pins and the
postfilter VGA gain.
The ADRF6518 operates from a 3.15 V to 3.45 V supply and
consumes a maximum supply current of 400 mA. When fully
disabled, it consumes <10 mA. The ADRF6518 is fabricated in
an advanced silicon-germanium BiCMOS process and is available
in a 32-lead, exposed pad LFCSP. Performance is specified over
the −40°C to +85°C temperature range.


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