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AD8327-EVAL

更新时间： 2024-11-20 22:50:03
品牌 Logo 应用领域
亚德诺 - ADI 驱动器电视有线电视功率控制
页数 文件大小 规格书
20页 306K
描述
5 V CATV Line Driver Coarse Step Output Power Control

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AD8327-EVAL 数据手册

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5 V CATV Line Driver Coarse Step  
Output Power Control  
a
AD8327  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Supports DOCSIS Standard for Reverse Path  
Transmission  
V
CC  
(5 PINS)  
BYP  
Gain Programmable in 6.02 dB Steps over a 48.16 dB  
Range  
R1  
AD8327  
Low Distortion at 60 dBmV Output  
–63 dBc SFDR at 21 MHz  
–57 dBc SFDR at 42 MHz  
V
IN+  
DIFF OR  
SINGLE  
INPUT  
AMP  
POWER  
AMP  
ATTENUATION  
CORE  
V
VERNIER  
OUT  
V
IN–  
Output Noise Level  
Z
OUT  
= 75⍀  
8
–47 dBmV in 160 kHz  
DECODE  
R2  
Maintains 75 ⍀ Output Impedance  
Transmit Enable and Transmit Disable Modes  
Upper Bandwidth: 160 MHz (Full Gain Range)  
5 V Supply Operation  
Z
Z
IN  
(SINGLE) = 800⍀  
(DIFF) = 1.6k⍀  
IN  
8
POWER-DOWN  
LOGIC  
CXR  
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 (5 PINS)  
SLEEP  
General-Purpose Digitally Controlled Variable Gain Block  
–50  
–55  
–60  
–65  
GENERAL DESCRIPTION  
V
= 60dBmV @ MAX GAIN  
OUT  
The AD8327 is a low-cost, digitally controlled, variable gain  
amplifier 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 48.16 dB range resulting in gain changes of  
6.02 dB/major carry.  
HD3  
HD2  
The AD8327 comprises a digitally controlled variable attenuator  
of 0 dB to –48.16 dB, which is preceded by a low noise, fixed  
gain buffer and followed by a low distortion, high power amplifier.  
The AD8327 accepts a differential or single-ended input  
signal. The output is specified for driving a 75 Ω load, such  
as coaxial cable.  
–70  
–75  
5
15  
25  
35  
45  
55  
65  
Distortion performance of –63 dBc is achieved with an output  
level up to 60 dBmV at 21 MHz bandwidth. A key performance  
and cost advantage of the AD8327 results from the ability to  
maintain a constant 75 Ω output impedance during Transmit  
Enable and Transmit Disable conditions. In addition, this  
device has a sleep mode function that reduces the quiescent  
current to 5 mA.  
FUNDAMENTAL FREQUENCY – MHz  
Figure 1. Harmonic Distortion vs. Frequency  
The AD8327 is packaged in a low-cost 20-lead TSSOP, operates  
from a single 5 V supply, and has an operational temperature  
range of –40°C to +85°C.  
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  
© Analog Devices, Inc., 2001  
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