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參數資料
| 型號： | AD8321AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Gain Programmable CATV Line Driver |
| 中文描述： | LINE DRIVER, PDSO20 |
| 封裝： | MS-013AC, SOIC-20 |
| 文件頁數： | 12/19頁 |
| 文件大小： | 660K |
| 代理商： | AD8321AR |
AD8321
–12–
REV. 0
Differential Input Option 2
: Install the Mini-Circuits T1-6T-
KK81 1:1 transformer in the T1 location of the evaluation
board. Jumpers J1, J2 and J3 should be applied pointing in the
direction of the transformer. Apply an open circuit in the R3
position while J4 is applied connecting the center-tap of the
secondary to ground. A 41
resistor should be used between
each input and ground at R1 and R2. This option will also
result in a 75
differential input termination to the AD8321.
If a 50
single-ended input source is applied to the VIN+/
DIFF IN port, the R1 and R2 values should be 26.7
.
Differential Input Option 3
: A differential input may be ap-
plied to both VIN– and VIN+ inputs of the evaluation board. In
this example, no transformer is employed. Jumpers J1, J2 and J3
are installed in line with the input signals. Select the differential
input termination configuration of either
Option 1
or
Option 2
.
Apply
Option 1
resistor value to R3 for a true differential input
or apply Option 2 values to R1 and R2 to produce ground refer-
enced inputs that are separated in phase by 180
°
. If the differen-
tial input signal source impedance is anything other than 75
or 50
, calculate the appropriate value according to the equa-
tions below:
For
Option 1
Configurations:
Desired Input Impedance
=
R
3
i
900
For
Option 2
and
3
(R1 = R2 = R):
Desired Input Impedance
= 2
×
(
R
i
450)
DIFF IN
T1
AD8321
DIFF IN
T1
R1
R2
AD8321
VIN+
R1
R2
AD8321
R3
OPTION 1 DIFFERENTIAL INPUT TERMINATION
OPTION 2 DIFFERENTIAL INPUT TERMINATION
OPTION 3 DIFFERENTIAL INPUT TERMINATION
VIN–
Figure 27. Differential Input Termination Options
Controlling the Evaluation Board from a PC
The AD8321-EVAL package comes with the circuit described
by Figure 28 and includes a –2 dB attenuator (reference Rc, Rd
and Re) and the control software allowing the user to program
the gain/attenuation of the AD8321 via a standard printer cable
connected to the parallel port of a PC.
Install Software
To install the “CABDRIVE” software that controls the AD8321-
EVAL evaluation circuit, close all Windows applications and
select the “SETUP” file located on Disk 1 of the AD8321-
EVAL software. Follow the on screen instructions (see Figure
29) and insert Disk 2 when prompted to do so. Enter the path
of the directory into which the control software will be installed.
Select the button in the upper left corner to begin the installa-
tion of “CABDRIVE” software into the specified directory.
Running the Software
To invoke the control software, select the “Ad8321” icon from
the directory containing the installed software. After invoking
the control software, choose the appropriate printer port from
the display portrayed in Figure 30.
Controlling the Gain/Attenuation of AD8321
The AD8321 control panel has four different functions. The
slide bar controls the gain/attenuation of the AD8321. Adjust
the slider to the gain/attenuation displayed in units of dB. The
additional displays show the selection in units of Volts (output)/
Volts (input), and the corresponding control codes in decimal,
binary and hexadecimal. (See Figure 31.)
“POWER UP” and “POWER DOWN”
The buttons marked “Power Up” and “Power Down” select
the mode of operation of the AD8321. The “Power Up” button
puts the AD8321 in forward transmit mode feeding the condi-
tioned signal to the VOUT port on the evaluation board. Con-
versely, the “Power Down” button selects the reverse mode
where the forward signal transmission is disabled and the low
noise reverse amplifier actively maintains a 75
back termina-
tion. These features may be selected asynchronously (at any
time). (See the section on Between Burst Transient Reduction
for more specific details.)
Enable Output Switch
An Alpha Industries AS128-73 GaAs 2W Hi Linearity switch is
installed on a standard AD8321-EVAL circuit and is controlled
by the check box on the control panel portrayed in Figure 31.
This feature is intended to remove the output of the AD8321
from the VOUT port prior to using the “Power Up” and
“Power Down” feature described above. This application circuit
may be used to reduce any transients created between bursts to
DOCSIS compliant levels. (See the section on Between Burst
Transient Reduction for more specific details.)
相關PDF資料 |
PDF描述 |
|---|---|
| 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 |
| AD8323ARU-REEL | 5 V CATV Line Driver Fine Step Output Power Control |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8321AR-REEL | 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 20-Pin SOIC W T/R |
| AD8321ARZ | 功能描述:IC LINE DRIVER CATV 3.3V 20SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調諧器 應用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| AD8321ARZ2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Gain Programmable CATV Line DRiver |
| AD8321ARZ-REEL | 功能描述:IC LINE DVR CATV 20-SOIC T/R RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調諧器 應用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| AD8321ARZ-REEL2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Gain Programmable CATV Line DRiver |
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