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AD812 其他数据使用手册 - TE Connectivity（泰科）
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AD812数据手册
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Triple Differential Receiver with
300 Meter Adjustable Line Equalization
Data Sheet
AD8122
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. 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 registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights reserved.
FEATURES
Compensates cables up to 300 meters for wideband video
60 MHz equalized BW at 300 meters of UTP cable
120 MHz equalized BW at 150 meters of UTP cable
Fast time domain performance
70 ns settling time to 1% at 300 meters of UTP cable
7 ns rise/fall times with 2 V step at 300 meters of UTP cable
3 frequency response gain adjustment pins
High frequency peaking adjustment (V
PEAK
)
Output low-pass filter cutoff adjustment (V
FI LTE R
)
Broadband flat gain adjustment (V
GAIN
)
Selectable for UTP or coaxial compensation
DC output offset adjustment pin (V
OFFSET
)
Low output offset voltage: ±4 mV at G = 1
Compensates both RGB and YPbPr
2 on-chip comparators with hysteresis can be used
for common-mode sync pulse extraction
Available in 40-lead, 6 mm × 6 mm LFCSP
APPLICATIONS
Keyboard-video-mouse (KVM)
Digital signage
RGB video over UTP cables
Professional video projection and distribution
HD video
Security video
FUNCTIONAL BLOCK DIAGRAM
OUT
R
GAIN
R
OUT
G
GAIN
G
OUT
B
GAIN
B
V
PEAK
V
FILTER
V
OFFSET
V
GAIN
–IN
CMP1
+IN
CMP1
–IN
CMP2
OUT
CMP1
OUT
CMP2
+IN
CMP2
AD8122
COAX/UTP
–IN
R
+IN
R
–IN
G
+IN
G
–IN
B
+IN
B
10780-001
Figure 1.
GENERAL DESCRIPTION
The AD8122 is a high speed, triple differential receiver and
equalizer that compensates for the transmission losses of UTP
cables up to 300 meters in length and coaxial cables up to
200 meters in length. Various gain stages are summed to best
approximate the inverse frequency response of the cable. Each
channel features a high impedance differential input with high
rejection of common-mode (CM) signals that is ideal for inter-
facing directly with the cable.
The AD8122 has two control inputs for optimal cable
compensation, one LPF control input, an input to select UTP or
coaxial cable, and an input to adjust the dc output offset. The cable
compensation inputs are used to compensate for different cable
lengths: the V
PEAK
input controls the amount of high frequency
peaking, and the V
GAIN
input adjusts the broadband flat gain to
compensate for the flat cable loss. The V
FILTER
input controls the
cutoff frequency of output low-pass filters on each channel.
The selection of UTP or coaxial cable compensation responses
is determined by the binary COAX/
UTP
input, which can be
left floating in UTP applications. The V
OFFSET
input allows the
dc voltage at the output to be adjusted, which can be useful in
dc-coupled systems.
For added flexibility, the gain of each channel can be set to 1
or 2 using the associated gain control pin.
The AD8122 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.
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