參數(shù)資料
型號(hào)： AD9874ABSTZRL
廠商： ANALOG DEVICES INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PQFP48
封裝： PLASTIC, MS-026BBC, LQFP-48
文件頁(yè)數(shù)： 1/40頁(yè)
文件大?。?/td> 1682K
代理商： AD9874ABSTZRL
REV. A
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
2003 Analog Devices, Inc. All rights reserved.
AD9874*
IF Digitizing Subsystem
*Protected by U.S. Patent No. 5,969,657; other patents pending.
FEATURES
10 MHz to 300 MHz Input Frequency
7.2 kHz to 270 kHz Output Signal Bandwidth
8.1 dB SSB NF
0 dBm IIP3
AGC Free Range up to –34 dBm
12 dB Continuous AGC Range
16 dB Front End Attenuator
Baseband I/Q 16-Bit (or 24-Bit) Serial Digital Output
LO and Sampling Clock Synthesizers
Programmable Decimation Factor, Output Format,
AGC, and Synthesizer Settings
370
Input Impedance
2.7 V to 3.6 V Supply Voltage
Low Current Consumption: 20 mA
48-Lead LQFP Package (1.4 mm Thick)
APPLICATIONS
Multimode Narrow-Band Radio Products
Analog/Digital UHF/VHF FDMA Receivers
TETRA, APCO25, GSM/EDGE
Portable and Mobile Radio Products
Base Station Applications
SATCOM Terminals
-
ADC
LNA
DAC
AGC
VOLTAGE
REFERENCE
SPI
CONTROL LOGIC
FORMATTING/SSI
DECIMATION
FILTER
LO
SYN
CLK SYN
LO VCO AND
LOOP FILTER
IFIN
FREF
DOUTA
DOUTB
FS
CLKOUT
SYNCB
PE
PD
PC
VREFN
VCM
VREFP
MXOP MXON IF2P IF2N
GCP GCN
–16dB
AD9874
CLKN
CLKP
IOUTC
LON
LOP
IOUTL
LOOP FILTER
GENERAL DESCRIPTION
The AD9874 is a general-purpose IF subsystem that digitizes a
low level 10 MHz to 300 MHz IF input with a signal bandwidth
ranging from 6.8 kHz to 270 kHz. The signal chain of the AD9874
consists of a low noise amplifier, a mixer, a band-pass sigma-delta
analog-to-digital converter, and a decimation filter with program-
mable decimation factor. An automatic gain control (AGC) circuit
gives the AD9874 12 dB of continuous gain adjustment. Auxil-
iary blocks include both clock and LO synthesizers.
The AD9874’s high dynamic range and inherent antialiasing
provided by the band-pass sigma-delta converter allow the
AD9874 to cope with blocking signals up to 95 dB stronger
than the desired signal. This attribute can often reduce the cost of
a radio by reducing its IF filtering requirements. Also, it enables
multimode radios of varying channel bandwidths, allowing the
IF filter to be specified for the largest channel bandwidth.
The SPI port programs numerous parameters of the AD9874,
thus allowing the device to be optimized for any given application.
Programmable parameters include synthesizer divide ratios, AGC
attenuation and attack/decay time, received signal strength level,
decimation factor, output data format, 16 dB attenuator, and the
selected bias currents. The bias currents of the LNA and mixer
can be further reduced at the expense of degraded performance
for battery-powered applications.
FUNCTIONAL BLOCK DIAGRAM
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