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AD8325_05

更新时间： 2024-11-21 04:30:59
品牌 Logo 应用领域
亚德诺 - ADI 驱动器有线电视功率控制
页数 文件大小 规格书
16页 709K
描述
5 V CATV Line Driver Fine Step Output Power Control

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AD8325_05 数据手册

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5 V CATV Line Driver Fine Step  
Output Power Control  
aꢀ  
AD8325  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Supports DOCSIS Standard for Reverse Path  
Transmission  
V
CC  
(7 PINS)  
BYP  
Gain Programmable in 0.75 dB Steps Over a 59.45 dB  
Range  
R1  
AD8325  
Low Distortion at 61 dBmV Output  
–57 dBc SFDR at 21 MHz  
–55 dBc SFDR at 42 MHz  
V
V
V
V
IN+  
OUT+  
DIFF OR  
SINGLE  
INPUT  
AMP  
POWER  
AMP  
ATTENUATION  
CORE  
VERNIER  
IN–  
OUT–  
Output Noise Level  
–48 dBmV in 160 kHz  
Z
DIFF =  
OUT  
75�  
8
DECODE  
R2  
Maintains 75 � Output Impedance  
Transmit Enable and Transmit Disable Modes  
Upper Bandwidth: 100 MHz (Full Gain Range)  
5 V Supply Operation  
Z
Z
(SINGLE) = 800�  
(DIFF) = 1.6k�  
IN  
IN  
8
POWER-DOWN  
LOGIC  
DATA LATCH  
8
SHIFT  
REGISTER  
Supports SPI Interfaces  
APPLICATIONS  
Gain-Programmable Line Driver  
DOCSIS High-Speed Data Modems  
Interactive Cable Set-Top Boxes  
PC Plug-in Cable Modems  
TXEN  
DATEN DATA CLK GND (11 PINS)  
SLEEP  
General-Purpose Digitally Controlled Variable Gain Block  
GENERAL DESCRIPTION  
The AD8325 is a low-cost, digitally controlled, variable gain ampli-  
fier optimized for coaxial line driving applications such as cable  
modems that are designed to the MCNS-DOCSIS upstream  
standard. An 8-bit serial word determines the desired output gain  
over a 59.45 dB range resulting in gain changes of 0.7526 dB/LSB.  
–50  
–52  
–54  
–56  
–58  
–60  
–62  
–64  
V
= 62dBmV  
OUT  
@ MAX GAIN  
V
= 61dBmV  
OUT  
@ MAX GAIN  
The AD8325 comprises a digitally controlled variable attenuator  
of 0 dB to –59.45 dB, which is preceded by a low noise, fixed  
gain buffer and is followed by a low distortion high power ampli-  
fier. The AD8325 accepts a differential or single-ended input  
signal. The output is specified for driving a 75 W load, such as  
coaxial cable.  
Distortion performance of –57 dBc is achieved with an output  
level up to 61 dBmV at 21 MHz bandwidth. A key performance  
and cost advantage of the AD8325 results from the ability to  
maintain a constant 75 W output impedance during Transmit  
Enable and Transmit Disable conditions. In addition, this  
device has a sleep mode function that reduces the quiescent  
current to 4 mA.  
V
= 60dBmV  
OUT  
@ MAX GAIN  
V
= 59dBmV  
OUT  
@ MAX GAIN  
5
15  
25  
35  
45  
55  
65  
FUNDAMENTAL FREQUENCY – MHz  
Figure 1. Worst Harmonic Distortion vs. Gain Control  
The AD8325 is packaged in a low-cost 28-lead TSSOP, 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, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
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 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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