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参数资料
| 型号： | AD8325ARU-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | 5 V CATV Line Driver Fine Step Output Power Control |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封装： | TSSOP-28 |
| 文件页数： | 10/16页 |
| 文件大小： | 304K |
| 代理商： | AD8325ARU-REEL |
REV. 0
AD8325
–10–
Differential Inputs
The AD8325-EVAL evaluation board may be driven with a
differential signal in one of two ways. A transformer may be
used to convert a single-ended signal to differential, or a differ-
ential signal source may be used. Figure 7 and the following
paragraphs describe each of these methods.
Single-Ended-to-Differential Input (Figure 7, Option 1)
A TOKO 617DB-A0070 1:1 transformer is preinstalled in the
T3 location of the evaluation board. Install 0
chip resistors at
R14, R15, and R20, and leave R16 through R19 open. For
50
differential input impedance, install a 51.1
resistor at R13.
For 75
differential input impedance, use a 78.7
resistor.
In this configuration, the input signal must be applied to the
V
IN+
port of the evaluation board. For input impedances other
than 50
or 75
, the correct value for R13 can be calculated
using the following equation.
Desired Input Impedance
= (
R
13 1600)
Differential Input (Figure 7, Option 2)
If a differential signal source is available, it may be applied
directly to both the V
IN+
and V
IN
–
input ports of the evaluation
board. In this case, 0
chip resistors should be installed at
locations R16 through R19, and R14, R15, and R20 should be
left open. The equation at the end of the preceding paragraph
can be used to compute the correct value for R13 for any
desired differential input impedance. For differential input
impedances of 75
or 150
, the value of R13 will be 78.7
or
165
respectively.
V
IN
+
AD8325
DIFFERENTIAL INPUT, OPTION 2
V
IN
–
R13
DIFF IN
T1
R13
AD8325
DIFFERENTIAL INPUT, OPTION 1
Figure 7. Differential Input Termination Options
Installing the Visual Basic Control Software
To install the
“
CABDRIVE_25
”
evaluation board control soft-
ware, close all Windows applications and then run
“
SETUP.EXE
”
located on Disk 1 of the AD8325 Evaluation Software. Follow
the on-screen instructions and insert Disk 2 when prompted to
do so. Enter the path of the directory into which the software
will be installed and select the button in the upper left corner to
complete the installation.
Running the Software
To invoke the control software, go to START -> PROGRAMS
-> CABDRIVE_25, or select the AD8325.EXE icon from the
directory containing the software.
Controlling the Gain/Attenuation of the AD8325
The slide bar controls the AD8325
’
s gain/attenuation, which is
displayed in dB and in V/V. The gain scales at 0.7526 dB per
LSB with the valid codes being from decimal 0 to 79. The gain
code (i.e., position of the slide bar) is displayed in decimal, binary,
and hexadecimal (see Figure 8).
Transmit Enable, Transmit Disable, and Sleep
The
“
Transmit Enable
”
and
“
Transmit Disable
”
buttons select
the mode of operation of the AD8325 by controlling the logic
level on the asynchronous TXEN pin. The
“
Transmit Enable
”
button applies a Logic 1 to the TXEN pin putting the AD8325
in forward transmit mode. The
“
Transmit Disable
”
button
applies a Logic 0 to the TXEN pin selecting reverse mode, where
the forward signal transmission is disabled while a back termina-
tion of 75
is maintained. On early revisions of the software,
the
“
Transmit Enable
”
and
“
Transmit Disable
”
buttons may be
called
“
Power-Up
”
and
“
Power-Down
”
respectively. Checking
the
“
Enable SLEEP Mode
”
box applies a Logic 0 to the asyn-
chronous
SLEEP
pin, putting the AD8325 into SLEEP mode.
Memory Section
The
“
MEMORY
”
section of the software provides a convenient
way to alternate between two gain settings. The
“
X->M1
”
but-
ton stores the current value of the gain slide bar into memory
while the
“
RM1
”
button recalls the stored value, returning the
gain slide bar to that level. The
“
X->M2
”
and
“
RM2
”
buttons
work in the same manner.
相关PDF资料 |
PDF描述 |
|---|---|
| AD8325-EVAL | 5 V CATV Line Driver Fine Step Output Power Control |
| AD8325 | Fast Switching Digitally Controlled Variable Gain Amplifier(快速转换数字控制的可变增益放大器) |
| AD8326ARE-EVAL | ER 4C 4#0 PIN RECP |
| AD8326ARE-REEL | High Output Power Programmable CATV Line Driver |
| AD8326ARP-EVAL | High Output Power Programmable CATV Line Driver |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8325ARUZ | 功能描述:IC LN DVR CATV FINE-STEP 28TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 视频处理 系列:- 标准包装:250 系列:- 类型:电平移位器 应用:LCD 电视机/监控器 安装类型:表面贴装 封装/外壳:28-WFQFN 裸露焊盘 供应商设备封装:28-WQFN（4x4）裸露焊盘 包装:带卷 (TR) 其它名称:296-32523-2TPS65198RUYT-ND |
| AD8325ARUZ-REEL | 功能描述:IC LN DVR CATV FINE-STEP 28TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 视频处理 系列:- 产品变化通告:Product Discontinuation 07/Mar/2011 标准包装:3,000 系列:OMNITUNE™ 类型:调谐器 应用:移动电话，手机，视频显示器 安装类型:表面贴装 封装/外壳:65-WFBGA 供应商设备封装:PG-WFSGA-65 包装:带卷 (TR) 其它名称:SP000365064 |
| AD8325-EVAL | 制造商:Analog Devices 功能描述:Evaluation Board For 5 V CATV Line Driver Fine Step Output Power Control 制造商:Analog Devices 功能描述:EVAL BD 5 V CATV LINE DRVR FINE STEP OUTPUT PWR CONTROL - Bulk 制造商:Analog Devices 功能描述:EVAL CARD ((NS)) |
| AD8326 | 制造商:AD 制造商全称:Analog Devices 功能描述:High Output Power Programmable CATV Line Driver |
| AD8326ARE | 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 制造商:Rochester Electronics LLC 功能描述:TSSOP HIGH OUTPUT POWER CATV LINE DRIVER - Bulk |
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