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參數資料
| 型號： | AD8323-EVAL |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 5 V CATV Line Driver Fine Step Output Power Control |
| 中文描述： | 5伏精細有線電視線路驅動器輸出功率控制步 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 277K |
| 代理商： | AD8323-EVAL |
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.
a
AD8323
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2000
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
AD8323
DATEN
DATA
CLK
GND (11 PINS)
PD
SLEEP
V
OUT+
V
OUT–
V
CC
(7 PINS)
V
IN+
V
IN–
BUFFER
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 53.5 dB
Range
Low Distortion at 60 dBmV Output
–56 dBc SFDR at 21 MHz
–55 dBc SFDR at 42 MHz
Output Noise Level
–48 dBmV in 160 kHz
Maintains 75
Output Impedance
Power-Up and Power-Down Condition
Upper Bandwidth: 100 MHz (Full Gain Range)
5 V Supply Operation
Supports SPI Interfaces
APPLICATIONS
Gain-Programmable Line Driver
HFC High-Speed Data Modems
Interactive Set-Top Boxes
PC Plug-in Modems
General-Purpose Digitally Controlled Variable Gain Block
GENERAL DESCRIPTION
The AD8323 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 53.5 dB range resulting in gain changes of 0.7526 dB/LSB.
The AD8323 comprises a digitally controlled variable attenuator
of 0 dB to –53.5 dB, which is preceded by a low noise, fixed
gain buffer and is followed by a low distortion high power am-
plifier. The AD8323 accepts a differential or single-ended input
signal. The output is specified for driving a 75
load, such as
coaxial cable.
Distortion performance of –56 dBc is achieved with an output
level up to 60 dBmV at 21 MHz bandwidth. A key performance
and cost advantage of the AD8323 results from the ability to main-
tain 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 operational amplifier. In addition, this
device has a sleep mode function that reduces the quiescent
current to 4 mA.
The AD8323 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.
GAIN CONTROL
–
DEC Code
–
50
0
D
–
–
55
–
60
–
65
–
70
–
75
8
16
24
32
40
48
56
HD3
HD2
F
O
= 42MHz
P
O
= 60dBmV @ MAX GAIN
64
72
Figure 1. Harmonic Distortion vs. Gain Control
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| 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 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8324 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3.3 V Upstream Cable Line Driver |
| AD8324_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:3.3 V Upstream Cable Line Driver |
| AD8324ACP | 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 3.47V 20-Pin LFCSP EP Tray 制造商:Rochester Electronics LLC 功能描述:+3.3 V UPSTREAM CABLE LINE DRIVER - Bulk |
| AD8324ACP-EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:3.3 V Upstream Cable Line Driver |
| AD8324ACP-R2 | 制造商:Analog Devices 功能描述:+3.3 V UPSTREAM CABLE LINE DRIVER - Tape and Reel |
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