參數(shù)資料
型號(hào)： AD8325ARU-REEL
廠(chǎng)商： ANALOG DEVICES INC
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： 5 V CATV Line Driver Fine Step Output Power Control
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO28
封裝： TSSOP-28
文件頁(yè)數(shù)： 1/16頁(yè)
文件大小： 304K
代理商： AD8325ARU-REEL
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
a
AD8325
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
5 V CATV Line Driver Fine Step
Output Power Control
FUNCTIONAL BLOCK DIAGRAM
DIFF OR
SINGLE
INPUT
AMP
ATTENUATION
CORE
Z
OUT
DIFF =
75
8
8
8
Z
IN
(SINGLE) = 800
Z
IN
(DIFF) = 1.6k
R1
R2
AD8325
DATEN
DATA
CLK
GND (11 PINS)
TXEN
SLEEP
V
OUT+
V
OUT–
V
CC
(7 PINS)
V
IN+
V
IN–
VERNIER
DECODE
DATA LATCH
SHIFT
REGISTER
POWER-DOWN
LOGIC
POWER
AMP
BYP
FEATURES
Supports DOCSIS Standard for Reverse Path
Transmission
Gain Programmable in 0.75 dB Steps Over a 59.45 dB
Range
Low Distortion at 61 dBmV Output
–57 dBc SFDR at 21 MHz
–55 dBc SFDR at 42 MHz
Output Noise Level
–48 dBmV in 160 kHz
Maintains 75
Output Impedance
Transmit Enable and Transmit Disable Modes
Upper Bandwidth: 100 MHz (Full Gain Range)
5 V Supply Operation
Supports SPI Interfaces
APPLICATIONS
Gain-Programmable Line Driver
DOCSIS High-Speed Data Modems
Interactive Cable Set-Top Boxes
PC Plug-in Cable Modems
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.
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
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
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.
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.
FUNDAMENTAL FREQUENCY
–
MHz
–
50
5
D
–
–
52
–
54
–
56
–
60
–
64
15
25
35
45
55
65
–
62
–
58
V
= 60dBmV
@ MAX GAIN
V
= 62dBmV
@ MAX GAIN
V
OUT
= 61dBmV
@ MAX GAIN
V
= 59dBmV
@ MAX GAIN
Figure 1. Worst Harmonic Distortion vs. Gain Control
相關(guān)PDF資料
PDF描述
AD8325-EVAL 5 V CATV Line Driver Fine Step Output Power Control
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AD8326ARE-EVAL ER 4C 4#0 PIN RECP
AD8326ARE-REEL High Output Power Programmable CATV Line Driver
AD8326ARP-EVAL High Output Power Programmable CATV Line Driver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD8325ARUZ 功能描述:IC LN DVR CATV FINE-STEP 28TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 線(xiàn)性 - 視頻處理 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類(lèi)型:電平移位器 應(yīng)用:LCD 電視機(jī)/監(jiān)控器 安裝類(lèi)型:表面貼裝 封裝/外殼:28-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:28-WQFN（4x4）裸露焊盤(pán) 包裝:帶卷 (TR) 其它名稱(chēng):296-32523-2TPS65198RUYT-ND
AD8325ARUZ-REEL 功能描述:IC LN DVR CATV FINE-STEP 28TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 線(xiàn)性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標(biāo)準(zhǔn)包裝:3,000 系列:OMNITUNE™ 類(lèi)型:調(diào)諧器 應(yīng)用:移動(dòng)電話(huà)，手機(jī)，視頻顯示器 安裝類(lèi)型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱(chēng):SP000365064
AD8325-EVAL 制造商:Analog Devices 功能描述:Evaluation Board For 5 V CATV Line Driver Fine Step Output Power Control 制造商:Analog Devices 功能描述:EVAL BD 5 V CATV LINE DRVR FINE STEP OUTPUT PWR CONTROL - Bulk 制造商:Analog Devices 功能描述:EVAL CARD ((NS))
AD8326 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:High Output Power Programmable CATV Line Driver
AD8326ARE 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 制造商:Rochester Electronics LLC 功能描述:TSSOP HIGH OUTPUT POWER CATV LINE DRIVER - Bulk
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