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| 型号： | AD8321-EVAL |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Gain Programmable CATV Line Driver |
| 中文描述： | 增益可编程有线电视线路驱动器 |
| 文件页数： | 1/19页 |
| 文件大小： | 660K |
| 代理商： | AD8321-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
AD8321
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., 1999
Gain Programmable
CATV Line Driver
FEATURES
Linear in dB Gain Response Over >53 dB Range
Drives Low Distortion >11 dBm Signal into 75
V
Load:
–53 dBc SFDR at 42 MHz
Very Low Output Noise Level
Maintains Constant 75
V
Output Impedance
Power-Up and Power-Down Condition
No Line Transformer Required
Upper Bandwidth: 235 MHz (Min Gain)
9 V Single Supply Operation
Power-Down Functionality
Supports SPI Interface
Low Cost
APPLICATIONS
Gain Programmable Line Driver
HFC High Speed Data Modems
Interactive CATV Set-Top Boxes
CATV Plant Test Equipment
General Purpose IF Variable Gain Block
DESCRIPTION
The AD8321 is a low cost digitally controlled variable gain
amplifier optimized for coaxial line driving applications such as
cable modems that are designed to the DOCSIS* (upstream)
standard. An 8-bit serial word determines the desired output
gain over a 53.4 dB range, resulting in gain changes of 0.75 dB/
LSB.
The AD8321 comprises a digitally controlled variable attenuator
of 0 dB to –53.4 dB, which is preceded by a low noise, fixed
gain buffer and followed by a low distortion high power ampli-
fier. The AD8321 accepts a differential or single-ended input
signal. The output is specified for driving a 75
load, such as
coaxial cable, although the AD8321 is capable of driving other
loads. Performance of –53 dBc is achieved with an output level
up to 11 dBm at 42 MHz bandwidth using a 9 V supply.
A key performance and cost advantage of the AD8321 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 opera-
tional amplifier, thus eliminating the need for a transformer.
*Data-Over-Cable Service Interface Specifications
FUNCTIONAL BLOCK DIAGRAM
AD8321
POWER-
DOWN/
SWITCH
INTER
ATTENUATOR CORE
INV
DATDATA LATCH
DATA SHIFT REGISTER
PWR
AMP
DATEN
CLK
VIN+
VIN–
PD
VOUT
REVERSE
AMP
GND
VCC
SDATA
The AD8321 is packaged in a low cost 20-lead SOIC, operates
from a single +9 V supply, and has an operational temperature
range of –40
°
C to +85
°
C.
GAIN CONTROL – Decimal
D
–900
8
16
24
32
40
48
56
64
72
–80
–70
–60
–50
–40
f
O
= 42MHz
V
IN
= 137mV p-p
(P
IN
= –15dBm)
(P
= 11dBm @
MAX GAIN)
HD3
HD2
Figure 1. Harmonic Distortion vs. Gain Control
相关PDF资料 |
PDF描述 |
|---|---|
| AD8321AR | Gain Programmable CATV Line Driver |
| AD8322ARU-REEL | 5 V CATV Line Driver Coarse Step Output Power Control |
| AD8322-EVAL | 5 V CATV Line Driver Coarse Step Output Power Control |
| AD8322ARU | 5 V CATV Line Driver Coarse Step Output Power Control |
| AD8322 | 5 V CATV Line Driver Coarse Step Output Power Control |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8321XR2 | 制造商:Analog Devices 功能描述: |
| AD8322 | 制造商:AD 制造商全称:Analog Devices 功能描述:5 V CATV Line Driver Coarse Step Output Power Control |
| AD8322ARU | 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 COARSE STEP +5V CATV LINE DRIVER - Bulk |
| AD8322ARU-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 COARSE STEP +5V CATV LINE DRIVER - Tape and Reel |
| AD8322ARUZ | 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 5.25V 28-Pin TSSOP Tube |
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