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AD8328ARQ-EVAL PDF预览

AD8328ARQ-EVAL

更新时间: 2024-11-21 03:19:27
品牌 Logo 应用领域
亚德诺 - ADI 驱动器
页数 文件大小 规格书
20页 670K
描述
5 V Upstream Cable Line Driver

AD8328ARQ-EVAL 数据手册

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5 V Upstream  
Cable Line Driver  
AD8328  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
BYP  
Supports DOCSIS and EuroDOCSIS standards for reverse  
path transmission systems  
Gain programmable in 1 dB steps over a 59 dB range  
Low distortion at 60 dBmV output  
−57.5 dBc SFDR at 21 MHz  
AD8328  
DIFF  
V
V
V
V
IN+  
OUT+  
OR  
POWER  
AMP  
ATTENUATION  
SINGLE  
INPUT  
AMP  
VERNIER  
CORE  
−54 dBc SFDR at 65 MHz  
IN–  
OUT–  
Z
DIFF =  
OUT  
300  
8
Output noise level @ minimum gain 1.2 nV/√Hz  
Maintains 300 Ω output impedance Tx-enable and  
Tx-disable condition  
Z
Z
(SINGLE) = 800Ω  
(DIFF) = 1.6kΩ  
IN  
IN  
DECODE  
POWER-DOWN  
LOGIC  
8
RAMP  
DATA LATCH  
Upper bandwidth: 107 MHz (full gain range)  
5 V supply operation  
Supports SPI interfaces  
8
SHIFT  
REGISTER  
APPLICATIONS  
GND  
DATEN SDATA CLK  
TXEN  
SLEEP  
DOCSIS and EuroDOCSIS cable modems  
CATV set-top boxes  
Figure 1.  
CATV telephony modems  
Coaxial and twisted pair line drivers  
GENERAL DESCRIPTION  
–50  
The AD83281 is a low cost amplifier designed for coaxial line  
driving. The features and specifications make the AD8328  
ideally suited for MCNS-DOCSIS and EuroDOCSIS applications.  
The gain of the AD8328 is digitally controlled. An 8-bit serial  
word determines the desired output gain over a 59 dB range,  
resulting in gain changes of 1 dB/LSB.  
–52  
–54  
–56  
–58  
–60  
–62  
–64  
–66  
–68  
–70  
V
= 60dBmV  
OUT  
@ MAX GAIN,  
THIRD HARMONIC  
The AD8328 accepts a differential or single-ended input signal.  
The output is specified for driving a 75 Ω load through a 2:1  
transformer.  
V
= 60dBmV  
OUT  
@ MAX GAIN,  
SECOND HARMONIC  
Distortion performance of −53 dBc is achieved with an output  
level up to 60 dBmV at 65 MHz bandwidth over a wide  
temperature range.  
5
15  
25  
35  
45  
55  
65  
FREQUENCY (MHz)  
Figure 2. Worst Harmonic Distortion vs. Frequency  
1 Patent pending.  
This device has a sleep mode function that reduces the quiescent  
current to 2.6 mA and a full power-down function that reduces  
power-down current to 20 μA.  
The AD8328 is packaged in a low cost 20-lead LFCSP and  
a 20-lead QSOP. The AD8328 operates from a single 5 V supply  
and has an operational temperature range of −40°C to +85°C.  
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. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
© 2005 Analog Devices, Inc. All rights reserved.  
 

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