DataSheetWiki


AD8327 fiches techniques PDF

Analog Devices - 5 V CATV Line Driver Coarse Step Output Power Control

Numéro de référence AD8327
Description 5 V CATV Line Driver Coarse Step Output Power Control
Fabricant Analog Devices 
Logo Analog Devices 





1 Page

No Preview Available !





AD8327 fiche technique
a
5 V CATV Line Driver Coarse Step
Output Power Control
AD8327
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
FUNCTIONAL BLOCK DIAGRAM
VCC (5 PINS)
R1
BYP
AD8327
VIN+
VIN–
DIFF OR
SINGLE
INPUT
AMP
VERNIER
R2
ZIN (SINGLE) = 800
ZIN (DIFF) = 1.6k
ATTENUATION
CORE
POWER
AMP
VOUT
8
DECODE
ZOUT = 75
8
DATA LATCH
POWER-DOWN
LOGIC
CXR
8
SHIFT
REGISTER
DATEN DATA CLK GND (5 PINS) TXEN SLEEP
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.
50
VOUT = 60dBmV @ MAX GAIN
55
HD3
60
HD2
65
70
75
5
15 25 35 45 55
FUNDAMENTAL FREQUENCY MHz
65
Figure 1. Harmonic Distortion vs. Frequency
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001

PagesPages 20
Télécharger [ AD8327 ]


Fiche technique recommandé

No Description détaillée Fabricant
AD8320 Serial Digital Controlled Variable Gain Line Driver Analog Devices
Analog Devices
AD8321 Gain Programmable CATV Line Driver Analog Devices
Analog Devices
AD8322 5 V CATV Line Driver Coarse Step Output Power Control Analog Devices
Analog Devices
AD8323 5 V CATV Line Driver Fine Step Output Power Control Analog Devices
Analog Devices

US18650VTC5A

Lithium-Ion Battery

Sony
Sony
TSPC106

PCI Bus Bridge Memory Controller

ATMEL
ATMEL
TP9380

NPN SILICON RF POWER TRANSISTOR

Advanced Semiconductor
Advanced Semiconductor


www.DataSheetWiki.com    |   2020   |   Contactez-nous  |   Recherche