AD9874BST

更新时间： 2024-11-06 22:50:03

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
40页	730K
描述
IF Digitizing Subsystem

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AD9874BST 数据手册

IF Digitizing Subsystem

AD9874^*

FEATURES

GENERAL DESCRIPTION

10 MHz–300 MHz Input Frequency

6.8 kHz–270 kHz Output Signal Bandwidth

8.1 dB SSB NF

The AD9874 is a general-purpose IF subsystem that digitizes a

low level 10 MHz–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. Auxiliary

blocks include both clock and LO synthesizers.

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

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

2.7 V–3.6 V Supply Voltage

Low Current Consumption: 20 mA

48–Lead LQFP Package (1.4 mm Thick)

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.

APPLICATIONS

The SPI port programs numerous parameters of the AD9874,

thus allowing the device to be optimized for any given

application. Programmable parameters include the following:

synthesizer divide ratios; AGC attenuation and attack/decay

time; the received signal strength level; decimation factor; the

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 the degraded performance for battery-

powered applications.

Multimode Narrowband Radio Products

Analog/Digital UHF/VHF FDMA Receivers

TETRA, APCO25, GSM/EDGE

Portable and Mobile Radio Products

Base Station Applications

FUNCTIONAL BLOCK DIAGRAM

MXOP MXON IF2P IF2N

GCP GCN

DAC

AGC

AD9874

–16dB

LNA

DECIMATION

FILTER

IFIN

ꢁ-ꢂ ADC

FORMATTING/SSI

DOUTA

DOUTB

CLKOUT

FREF

CONTROL LOGIC

SYNC

SAMPLE CLOCK

SYNTHESIZER

VOLTAGE

REFERENCE

SPI

IOUTL

LOP LON

IOUTC CLKP

CLKN VREFP VCM VREFN PC PD PE

SYNCB

LO VCO AND

LOOP FILTER

LO VCO AND

LOOP FILTER

*Protected by U.S. Patent No. 5,969,657; other patents pending.

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

www.analog.com

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与AD9874BST相关器件

型号	品牌	获取价格	描述	数据表
AD9874BSTZ	ADI	获取价格	IC SPECIALTY TELECOM CIRCUIT, PQFP48, PLASTIC, MS-026BBC, LQFP-48, Telecom IC:Other
AD9874EB	ADI	获取价格	IF Digitizing Subsystem
AD9874-EB	ADI	获取价格	IF Digitizing Subsystem
AD9875	ADI	获取价格	Broadband Modem Mixed-Signal Front End
AD9875BST	ADI	获取价格	Broadband Modem Mixed-Signal Front End
AD9875BSTRL	ADI	获取价格	Broadband Modem Mixed-Signal Front End
AD9875BSTZ	ADI	获取价格	IC SPECIALTY TELECOM CIRCUIT, PQFP48, LQFP-48, Telecom IC:Other
AD9875BSTZRL	ADI	获取价格	IC SPECIALTY TELECOM CIRCUIT, PQFP48, LQFP-48, Telecom IC:Other
AD9875-EB	ADI	获取价格	Broadband Modem Mixed-Signal Front End
AD9876	ADI	获取价格	Broadband Modem Mixed-Signal Front End

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