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AD8321-EVAL PDF预览

AD8321-EVAL

更新时间: 2024-02-19 23:37:55
品牌 Logo 应用领域
亚德诺 - ADI 驱动器电视有线电视
页数 文件大小 规格书
19页 663K
描述
Gain Programmable CATV Line Driver

AD8321-EVAL 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Active零件包装代码:SOIC
包装说明:LEAD FREE, MS-013AC, SOIC-20针数:20
Reach Compliance Code:unknown风险等级:5.54
差分输出:NO驱动器位数:1
输入特性:DIFFERENTIAL接口集成电路类型:LINE DRIVER
接口标准:GENERAL PURPOSEJESD-30 代码:R-PDSO-G20
JESD-609代码:e3长度:12.8 mm
湿度敏感等级:1功能数量:1
端子数量:20最高工作温度:85 °C
最低工作温度:-40 °C封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装形状:RECTANGULAR
封装形式:SMALL OUTLINE峰值回流温度(摄氏度):260
座面最大高度:2.65 mm标称供电电压:9 V
表面贴装:YES温度等级:INDUSTRIAL
端子面层:MATTE TIN端子形式:GULL WING
端子节距:1.27 mm端子位置:DUAL
处于峰值回流温度下的最长时间:40宽度:7.5 mm

AD8321-EVAL 数据手册

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Gain Programmable  
CATV Line Driver  
a
AD8321  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Linear in dB Gain Response Over >53 dB Range  
Drives Low Distortion >11 dBm Signal into 75 Load:  
–53 dBc SFDR at 42 MHz  
VCC  
GND  
Very Low Output Noise Level  
Maintains Constant 75 Output Impedance  
Power-Up and Power-Down Condition  
No Line Transformer Required  
Upper Bandwidth: 235 MHz (Min Gain)  
9 V Single Supply Operation  
Power-Down Functionality  
PWR  
AMP  
AD8321  
VOUT  
VIN+  
VIN–  
REVERSE  
AMP  
INV  
ATTENUATOR CORE  
DATA LATCH  
Supports SPI Interface  
Low Cost  
POWER-  
DOWN/  
SWITCH  
INTER  
PD  
DATA SHIFT REGISTER  
APPLICATIONS  
Gain Programmable Line Driver  
HFC High Speed Data Modems  
Interactive CATV Set-Top Boxes  
CATV Plant Test Equipment  
General Purpose IF Variable Gain Block  
DATEN CLK  
SDATA  
DESCRIPTION  
The AD8321 is packaged in a low cost 20-lead SOIC, operates  
from a single +9 V supply, and has an operational temperature  
range of –40°C to +85°C.  
The AD8321 is a low cost digitally controlled variable gain  
amplifier optimized for coaxial line driving applications such as  
cable modems that are designed to the DOCSIS* (upstream)  
standard. An 8-bit serial word determines the desired output  
gain over a 53.4 dB range, resulting in gain changes of 0.75 dB/  
LSB.  
–40  
f
= 42MHz  
O
V
= 137mV p-p  
IN  
(P = –15dBm)  
IN  
–50  
–60  
(P  
= 11dBm @  
OUT  
The AD8321 comprises a digitally controlled variable attenuator  
of 0 dB to –53.4 dB, which is preceded by a low noise, fixed  
gain buffer and followed by a low distortion high power ampli-  
fier. The AD8321 accepts a differential or single-ended input  
signal. The output is specified for driving a 75 load, such as  
coaxial cable, although the AD8321 is capable of driving other  
loads. Performance of –53 dBc is achieved with an output level  
up to 11 dBm at 42 MHz bandwidth using a 9 V supply.  
MAX GAIN)  
HD3  
HD2  
–70  
–80  
–90  
A key performance and cost advantage of the AD8321 results  
from the ability to maintain a constant 75 output impedance  
during power-up and power-down conditions. This eliminates  
the need for external 75 termination, resulting in twice the  
effective output voltage when compared to a standard opera-  
tional amplifier, thus eliminating the need for a transformer.  
0
8
16  
24  
32  
40  
48  
56  
64  
72  
GAIN CONTROL – Decimal  
Figure 1. Harmonic Distortion vs. Gain Control  
*Data-Over-Cable Service Interface Specifications  
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, nor for any infringements of patents or other rights of third parties  
which 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  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1999  

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