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參數資料
| 型號： | AD8325ARU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 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 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 304K |
| 代理商： | AD8325ARU |
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PDF資料 |
PDF描述 |
|---|---|
| AD8325ARU-REEL | 5 V CATV Line Driver Fine Step Output Power Control |
| AD8325-EVAL | 5 V CATV Line Driver Fine Step Output Power Control |
| AD8325 | Fast Switching Digitally Controlled Variable Gain Amplifier(快速轉換數字控制的可變增益放大器) |
| AD8326ARE-EVAL | ER 4C 4#0 PIN RECP |
| AD8326ARE-REEL | High Output Power Programmable CATV Line Driver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8325ARU-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:5 V CATV Line Driver Fine Step Output Power Control |
| AD8325ARUZ | 功能描述:IC LN DVR CATV FINE-STEP 28TSSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 標準包裝:250 系列:- 類型:電平移位器 應用:LCD 電視機/監控器 安裝類型:表面貼裝 封裝/外殼:28-WFQFN 裸露焊盤 供應商設備封裝:28-WQFN（4x4）裸露焊盤 包裝:帶卷 (TR) 其它名稱:296-32523-2TPS65198RUYT-ND |
| AD8325ARUZ-REEL | 功能描述:IC LN DVR CATV FINE-STEP 28TSSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調諧器 應用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱: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:Analog Devices 功能描述:High Output Power Programmable CATV Line Driver |
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