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AD8128 Datasheet

  • AD8128

  • CAT-5 Receiver with Adjustable Line Equalization

  • 1235.32KB

  • 13頁

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CAT-5 Receiver with
Adjustable Line Equalization
AD8128
FEATURES
Tuned to compensate for Category-5 (CAT-5) cable losses
Up to 100 meters @ 120 MHz
2 voltage-controlled frequency response adjustment pins
High frequency peaking adjustment
Broadband gain adjustment
2700 V/渭s slew rate
Low output noise
1.5 mV rms integrated noise (1 GHz) @ 100 meters
equalized bandwidth
DC output offset adjust
Low offset voltage error: 7 mV typ
Equalized pass-band ripple 鹵1 dB to 70 MHz
Input: differential or single ended
Supply current: 24 mA on 鹵5 V
Small 8-lead 3 mm 脳 3 mm LFCSP
FUNCTIONAL BLOCK DIAGRAM
AD8128
HPF
V
IN+
V
IN鈥?/div>
HPF
V
OUT
LPF
05699-001
V
PEAK
V
GAIN
V
OFFSET
Figure 1.
APPLICATIONS
Keyboard-video-mouse (KVM)
RGB video over unshielded twisted pair (UTP) cable receivers
Professional video projection and distribution
Security video
GENERAL DESCRIPTION
The AD8128 is a high speed, differential receiver/equalizer that
compensates for the transmission losses of unshielded twisted
pair (UTP) CAT-5 cables. Various frequency dependent gain
stages are summed together to best approximate the inverse
frequency response of CAT-5/CAT-5e cable. An equalized
bandwidth of 120 MHz can be achieved for 100 meters of cable.
The AD8128 can be used as a standalone receiver/equalizer or
in conjunction with the AD8143, triple differential receiver, to
provide a complete low cost solution for receiving RGB over
UTP cable in such applications as KVM.
The AD8128 has three control pins for optimal CAT-5/CAT-5e
compensation. The equalized cable length is directly proportional
to the voltage applied to the V
PEAK
pin, which controls the
amount of high frequency peaking. V
GAIN
adjusts the broadband
gain from 0 dB to 3 dB, compensating for the resistive cable
loss. V
OFFSET
allows the output to be shifted by 鹵2.5 V, adding
flexibility for dc-coupled systems.
Low integrated output noise and offset voltage adjust make the
AD8128 an excellent choice for dc-coupled wideband RGB-
over-CAT-5 applications. For systems where the UTP cable is
longer than 100 meters, two AD8128s can be cascaded to
compensate for up to 200 meters of CAT-5/CAT-5e.
The AD8128 is available in a 3 mm 脳 3 mm 8-lead LFCSP and
is rated to operate over the extended temperature range of
鈭?0擄C to +85擄C.
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
漏 2005 Analog Devices, Inc. All rights reserved.

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