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AD8322-EVAL

更新时间： 2024-11-20 22:35:27
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
16页 244K
描述
5 V CATV Line Driver Coarse Step Output Power Control

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AD8322-EVAL 数据手册

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5 V CATV Line Driver  
Coarse Step Output Power Control  
a
AD8322  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Supports DOCSIS Standard for Reverse Path  
Transmission  
V
(7 PINS)  
CC  
Gain Programmable in 6 dB Steps Over a 42 dB  
Range  
R1  
AD8322  
Low Distortion at 60 dBmV Output  
–58 dBc SFDR at 21 MHz  
–56 dBc SFDR at 42 MHz  
Output Noise Level  
–46 dBmV in 160 kHz Bandwidth  
Maintains 75 ⍀ Output Impedance  
Power-Up and Power-Down Condition  
180 MHz Bandwidth  
V
V
OUT+  
IN+  
DIFF  
ATTENUATION  
OR SINGLE  
INPUT  
BUFFER  
POWER  
AMP  
CORE  
V
V
OUT–  
IN–  
AMP  
8
Z
DIFF =  
OUT  
75⍀  
DECODE  
R2  
POWER-DOWN  
LOGIC  
Z
Z
(SINGLE) = 210⍀  
(DIFF) = 235⍀  
IN  
IN  
8
DATA LATCH  
8
SHIFT  
REGISTER  
5 V Supply Operation  
Supports SPI Interfaces  
DATEN DATA CLK  
GND (12 PINS)  
PD  
APPLICATIONS  
Gain Programmable Line Driver  
DOCSIS-Compliant Data Modems  
Interactive Set-Top Boxes  
PC Plug-in Modems  
General-Purpose Digitally Controlled Variable Gain Block  
–55  
–60  
GENERAL DESCRIPTION  
f
V
= 42MHz  
O
The AD8322 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 42.14 dB range, with gain steps of 6.02 dB/major  
carry.  
= 60dBmV  
O
@ MAX GAIN  
HD3  
HD2  
–65  
–70  
The AD8322 comprises a digitally controlled variable attenuator  
of 0 dB to –42.14 dB, which is preceded by a low-noise, fixed-gain  
buffer and is followed by a low-distortion, high-power ampli-  
fier. The AD8322 accepts a differential or single-ended input  
signal. The output is specified for driving a 75 Ω load, such as  
coaxial cable.  
–75  
1
2
4
8
16  
32  
64  
128  
Distortion performance of –58 dBc is achieved with an output level  
up to 60 dBmV at 21 MHz bandwidth. A key performance and  
cost advantage of the AD8322 results from the ability to maintain  
a constant 75 Ω output impedance during power-up and power-  
down conditions. This eliminates the need for external 75 Ω  
termination resulting in twice the effective output voltage when  
compared to a standard operational amplifier.  
GAIN CODE – Decimal  
Figure 1. Harmonic Distortion vs. Gain Control  
The AD8322 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. 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., 2000  
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