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AD8123ACPZ-RL1

更新时间: 2024-02-10 10:22:45
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亚德诺 - ADI /
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16页 734K
描述
Triple Differential Receiver with Adjustable Line Equalization

AD8123ACPZ-RL1 数据手册

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Triple Differential Receiver with  
Adjustable Line Equalization  
AD8123  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
V
V
V
V
PEAK  
POLE  
OFFSET GAIN  
Compensates cables to 300 meters for wideband video  
Fast rise and fall times  
AD8123  
4.9 ns with 2 V step @ 150 meters of UTP cable  
8.0 ns with 2 V step @ 300 meters of UTP cable  
55 dB peak gain at 100 MHz  
–IN  
+IN  
R
OUT  
OUT  
OUT  
R
G
B
R
Two frequency response gain adjustment pins  
–IN  
High frequency peaking adjustment (VPEAK  
Broadband flat gain adjustment (VGAIN  
Pole location adjustment pin (VPOLE  
)
G
G
)
+IN  
)
IN  
B
Compensates for variations between cables  
+IN  
Can be optimized for either UTP or coaxial cable  
B
DC output offset adjust (VOFFSET  
Low output offset voltage: 24 mV  
Compensates both RGB and YPbPr  
Two on-chip comparators with hysteresis  
Can be used for common-mode sync extraction  
Available in 40-lead, 6 mm × 6 mm LFCSP  
)
–IN  
+IN  
–IN  
+IN  
CMP1  
CMP1  
CMP2  
CMP2  
OUT  
OUT  
CMP1  
CMP2  
Figure 1.  
APPLICATIONS  
Keyboard-video-mouse (KVM)  
Digital signage  
RGB video over UTP cables  
Professional video projection and distribution  
HD video  
Security video  
For added flexibility, an optional pole adjustment pin, VPOLE  
allows movement of the pole locations, allowing for the  
compensation of different gauges and types of cable as well  
,
GENERAL DESCRIPTION  
The AD8123 is a triple, high speed, differential receiver and  
equalizer that compensates for the transmission losses of UTP  
and coaxial cables up to 300 meters in length. Various gain  
stages are summed together to best approximate the inverse  
frequency response of the cable. Logic circuitry inside the AD8123  
controls the gain functions of the individual stages so that the  
lowest noise can be achieved at short-to-medium cable lengths.  
This technique optimizes its performance for low noise, short-  
to-medium range applications, while at the same time provides  
the high gain bandwidth required for long cable equalization  
(up to 300 meters). Each channel features a high impedance  
differential input that is ideal for interfacing directly with the cable.  
as variations between different cables and/or equalizers. The  
OFFSET pin allows the dc voltage at the output to be adjusted,  
V
adding flexibility for dc-coupled systems.  
The AD8123 is available in a 6 mm × 6 mm, 40-lead LFCSP  
and is rated to operate over the extended temperature range of  
−40°C to +85°C.  
UXGA RESOLUTION IMAGE  
AFTER 300 METER CAT-5 CABLE  
BEFORE AD8123.  
UXGA RESOLUTION IMAGE  
AFTER 300 METER CAT-5 CABLE  
AFTER AD8123.  
The AD8123 has three control pins for optimal cable  
compensation, as well as an output offset adjust pin. Two  
voltage-controlled pins are used to compensate for different  
cable lengths; the VPEAK pin controls the amount of high frequency  
peaking and the VGAIN pin adjusts the broadband flat gain,  
which compensates for the low frequency flat cable loss.  
Figure 2.  
Rev. A  
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. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2007 Analog Devices, Inc. All rights reserved.  
 

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