AD8124ACPZ Analog Devices Inc, AD8124ACPZ Datasheet

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AD8124ACPZ

Manufacturer Part Number
AD8124ACPZ
Description
Triple Cat5 Cable Equalizer
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD8124ACPZ

Rohs Compliant
YES
Bandwidth
110MHz
Supply Voltage Range
± 4.5V To ± 5.5V
No. Of Pins
40
Operating Temperature Range
-40°C To +85°C
Peak Reflow Compatible (260 C)
Yes
Leaded Process Compatible
Yes
Digital Ic Case Style
LFCSP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
Compensates cables to 200 meters for wideband video
Fast rise and fall times
37 dB peak gain at 100 MHz
Two frequency response gain adjustment pins
Pole location adjustment pin (V
DC output offset adjust (V
Low output offset voltage: 24 mV
Compensates both RGB and YPbPr
Two on-chip comparators with hysteresis
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
GENERAL DESCRIPTION
The AD8124 is a triple, high speed, differential receiver and
equalizer that compensates for the transmission losses of UTP
and coaxial cables up to 200 meters in length. Various gain stages
are summed together to best approximate the inverse frequency
response of the cable. Logic circuitry inside the AD8124 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 longer cable equalization
(up to 200 meters). Each channel features a high impedance
differential input that is ideal for interfacing directly with the cable.
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.
All resolutions through UXGA
8 ns with 2 V step @ 200 meters of UTP cable
High frequency peaking adjustment (V
Broadband flat gain adjustment (V
Compensates for variations between cables
Can be optimized for either UTP or coaxial cable
Can be used for common-mode sync extraction
OFFSET
)
POLE
)
GAIN
)
PEAK
)
200 Meter Adjustable Cable Equalization
Triple Differential Receiver with
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The AD8124 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 V
peaking and the V
compensates for the low frequency flat cable loss.
For added flexibility, an optional pole adjustment pin, V
allows movement of the pole locations, allowing for the
compensation of different gauges and types of cable as well
as variations between different cables and/or equalizers. The
V
adding flexibility for dc-coupled systems.
The AD8124 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.
OFFSET
–IN
+IN
–IN
+IN
pin allows the dc voltage at the output to be adjusted,
CMP1
CMP1
CMP2
CMP2
+IN
–IN
+IN
+IN
–IN
IN
R
R
G
G
B
B
FUNCTIONAL BLOCK DIAGRAM
AD8124
GAIN
PEAK
pin adjusts the broadband flat gain, which
V
pin controls the amount of high frequency
PEAK
©2011 Analog Devices, Inc. All rights reserved.
Figure 1.
V
POLE
V
OFFSET
V
GAIN
AD8124
www.analog.com
OUT
OUT
OUT
OUT
OUT
R
G
B
CMP1
CMP2
POLE
,

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AD8124ACPZ Summary of contents

Page 1

FEATURES Compensates cables to 200 meters for wideband video All resolutions through UXGA Fast rise and fall times 8 ns with 2 V step @ 200 meters of UTP cable 37 dB peak gain at 100 MHz Two frequency response ...

Page 2

AD8124 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 Thermal Resistance ...................................................................... 5 Maximum Power Dissipation ..................................................... 5 ESD Caution.................................................................................. 5 ...

Page 3

SPECIFICATIONS T = 25° ± 150 Ω, Belden Cable (BL-7987R Figure 16, unless otherwise noted. Table 1. Parameter DYNAMIC PERFORMANCE 10% to 90% Rise/Fall Time Settling Time to 2% –3 dB ...

Page 4

AD8124 Parameter COMPARATORS Output Voltage Levels Hysteresis Propagation Delay Rise/Fall Times Output Resistance OPERATING TEMPERATURE RANGE Test Conditions/Comments HYST t /t PD RISE FALL Rev Page 4 of ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Power Dissipation Input Voltage (Any Input) Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 10 sec) Junction Temperature Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to ...

Page 6

AD8124 PIN CONFIGURATION AND FUNCTION DESCRIPTION Table 4. Pin Function Descriptions Pin No. Mnemonic 1, 10, 20, 21, 30 +IN CMP1 3 −IN CMP1 4 OUT CMP1 5 V _CMP S+ 6 OUT CMP2 7 −IN CMP2 ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS T = 25° ± 150 Ω, Belden Cable (BL-7987R Figure 16, unless otherwise noted PEAK POLE p-p ...

Page 8

AD8124 1.5 50m 200m 1.0 0.5 0 –0.5 –1.0 –1 100 150 200 250 300 TIME (ns) Figure 10. Pulse Response for Various Cable Lengths (2 MHz) 1000 100 0m 200m 0 100k 1M 10M FREQUENCY (Hz) Figure ...

Page 9

V PEAK 1.8 V POLE V GAIN 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0 100 125 150 CABLE LENGTH (meters) Figure 16. Recommended Settings for UTP Cable 2.0 V PEAK V POLE 1.8 ...

Page 10

AD8124 THEORY OF OPERATION The AD8124 is a unity-gain, triple, wideband, low noise analog line equalizer that compensates for losses in UTP and coaxial cables up to 200 meters in length. The 3-channel architecture is targeted at high resolution RGB ...

Page 11

APPLICATIONS INFORMATION BASIC OPERATION The AD8124 is easy to apply because it contains everything on-chip needed for cable loss compensation. Figure 19 shows a basic application circuit (power supplies not shown) with common- mode sync pulse extraction that is compatible ...

Page 12

AD8124 SYNC PULSE EXTRACTION USING COMPARATORS The AD8124 is useful in many systems that transport computer video signals, which typically comprise red, green, and blue (RGB) video signals and separate horizontal and vertical sync signals. Because the sync signals are ...

Page 13

USING THE AD8124 WITH COAXIAL CABLE The V control allows the AD8124 to be used with other POLE types of cable, including coaxial cable. Figure 17 presents the recommended settings for and V PEAK POLE AD8124 ...

Page 14

AD8124 A suitable filter that uses a surface-mount ferrite bead is shown in Figure 27, and its frequency response is shown in Figure 28. Because the frequency response was taken using a 50 Ω network analyzer and with only one ...

Page 15

... MAX 1.00 0.85 0.80 SEATING PLANE ORDERING GUIDE Model 1 Temperature Range AD8124ACPZ −40°C to +85°C AD8124ACPZ-R7 −40°C to +85°C AD8124ACPZ-RL −40°C to +85° RoHS Compliant Part. 6.00 BSC SQ 0.60 MAX 28 0.50 BSC TOP 5.75 VIEW BSC SQ 0. ...

Page 16

AD8124 NOTES ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09601-0-1/11(0) Rev Page ...

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