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参数资料
型号： AD8327-EVAL
厂商： Analog Devices, Inc.
英文描述： 5 V CATV Line Driver Coarse Step Output Power Control
中文描述： 5伏粗有线电视线路驱动器输出功率控制步
文件页数： 1/20页
文件大小： 307K
代理商： AD8327-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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
a
AD8327
Tel: 781/329-4700
Fax: 781/326-8703
5 V CATV Line Driver Coarse Step
Output Power Control
FUNCTIONAL BLOCK DIAGRAM
DIFF OR
SINGLE
INPUT
AMP
ATTENUATION
CORE
Z
OUT
= 75
8
8
8
Z
IN
(SINGLE) = 800
Z
IN
(DIFF) = 1.6k
R1
R2
V
OUT
AD8327
DATEN
DATA
CLK
GND (5 PINS)
TXEN
SLEEP
V
CC
(5 PINS)
V
IN+
V
IN–
VERNIER
DECODE
DATA LATCH
SHIFT
REGISTER
POWER-DOWN
LOGIC
POWER
AMP
BYP
CXR
FEATURES
Supports DOCSIS Standard for Reverse Path
Transmission
Gain Programmable in 6.02 dB Steps over a 48.16 dB
Range
Low Distortion at 60 dBmV Output
–63 dBc SFDR at 21 MHz
–57 dBc SFDR at 42 MHz
Output Noise Level
–47 dBmV in 160 kHz
Maintains 75
Output Impedance
Transmit Enable and Transmit Disable Modes
Upper Bandwidth: 160 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 AD8327 is a low-cost, digitally controlled, variable gain
amplifier 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 48.16 dB range resulting in gain changes of
6.02 dB/major carry.
The AD8327 comprises a digitally controlled variable attenuator
of 0 dB to –48.16 dB, which is preceded by a low noise, fixed
gain buffer and followed by a low distortion, high power amplifier.
The AD8327 accepts a differential or single-ended input
signal. The output is specified for driving a 75
load, such
as coaxial cable.
Distortion performance of –63 dBc is achieved with an output
level up to 60 dBmV at 21 MHz bandwidth. A key performance
and cost advantage of the AD8327 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 5 mA.
The AD8327 is packaged in a low-cost 20-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
–
60
–
75
–
65
–
55
5
15
25
35
45
55
65
D
–
–
70
HD3
HD2
V
OUT
= 60dBmV @ MAX GAIN
Figure 1. Harmonic Distortion vs. Frequency
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