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參數(shù)資料
| 型號(hào)： | AD8322-EVAL |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 5 V CATV Line Driver Coarse Step Output Power Control |
| 中文描述： | 5伏粗有線電視線路驅(qū)動(dòng)器輸出功率控制步 |
| 文件頁(yè)數(shù)： | 1/16頁(yè) |
| 文件大?。?/td> | 243K |
| 代理商： | AD8322-EVAL |
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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
AD8322
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
Coarse Step Output Power Control
FUNCTIONAL BLOCK DIAGRAM
DECODE
SHIFT
REGISTER
DATA LATCH
AD8322
V
IN+
V
IN–
V
OUT+
V
OUT–
BUFFER
R1
R2
ATTENUATION
CORE
8
8
8
POWER-DOWN
LOGIC
POWER
AMP
PD
GND
(12 PINS)
DATEN
DATA CLK
Z
IN
(SINGLE) = 210
Z
IN
(DIFF) = 235
Z
OUT
DIFF =
75
V
CC
(7 PINS)
DIFF
OR SINGLE
INPUT
AMP
FEATURES
Supports DOCSIS Standard for Reverse Path
Transmission
Gain Programmable in 6 dB Steps Over a 42 dB
Range
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
5 V Supply Operation
Supports SPI Interfaces
APPLICATIONS
Gain Programmable Line Driver
DOCSIS-Compliant Data Modems
Interactive Set-Top Boxes
PC Plug-in Modems
General-Purpose Digitally Controlled Variable Gain Block
GENERAL DESCRIPTION
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.
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
load, such as
coaxial cable.
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
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.
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.
GAIN CODE
–
Decimal
1
–
55
D
–
–
60
–
65
–
70
–
75
2
4
8
16
32
64
128
f
O
= 42MHz
V
= 60dBmV
@ MAX GAIN
HD3
HD2
Figure 1. Harmonic Distortion vs. Gain Control
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8322ARU | 5 V CATV Line Driver Coarse Step Output Power Control |
| AD8322 | 5 V CATV Line Driver Coarse Step Output Power Control |
| AD8323ARU-REEL | 5 V CATV Line Driver Fine Step Output Power Control |
| AD8323ARU | 5 V CATV Line Driver Fine Step Output Power Control |
| AD8323 | 5 V CATV Line Driver Fine Step Output Power Control |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8323 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:5 V CATV Line Driver Fine Step Output Power Control |
| AD8323ARU | 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 5.25V 28-Pin TSSOP Tube 制造商:Rochester Electronics LLC 功能描述:TSSOP FINE STEP +5V CATV LINE DRIVER - Bulk |
| AD8323ARU-REEL | 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 5.25V 28-Pin TSSOP T/R 制造商:Rochester Electronics LLC 功能描述:TSSOP FINE STEP +5V CATV LINE DRIVER - Tape and Reel |
| AD8323ARUZ | 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 5.25V 28-Pin TSSOP Tube 制造商:Rochester Electronics LLC 功能描述:TSSOP FINE STEP +5V CATV LINE DRIVER - Bulk |
| AD8323ARUZ-REEL | 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 5.25V 28-Pin TSSOP T/R 制造商:Rochester Electronics LLC 功能描述:TSSOP FINE STEP +5V CATV LINE DRIVER - Tape and Reel |
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