AD8124 Datasheet PDF - Analog Devices

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AD8124
Analog Devices

Part Number AD8124
Description Triple Differential Receiver
Page 16 Pages


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Data Sheet
Triple Differential Receiver with
200 Meter Adjustable Cable Equalization
AD8124
FEATURES
Compensates cables to 200 meters for wideband video
All resolutions through UXGA
Fast rise and fall times
8 ns with 2 V step at 200 meters of UTP cable
37 dB peak gain at 100 MHz
Two frequency response gain adjustment pins
High frequency peaking adjustment (VPEAK)
Broadband flat gain adjustment (VGAIN)
Pole location adjustment pin (VPOLE)
Compensates for variations between cables
Can be optimized for either UTP or coaxial cable
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
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.
FUNCTIONAL BLOCK DIAGRAM
VPEAK VPOLE VOFFSET VGAIN
AD8124
–INR
+INR
–ING
+ING
INB
+INB
–INCMP1
+INCMP1
–INCMP2
+INCMP2
Figure 1.
OUTR
OUTG
OUTB
OUTCMP1
OUTCMP2
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 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.
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
as variations between different cables and/or equalizers. The
VOFFSET pin allows the dc voltage at the output to be adjusted,
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.
Rev. A
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Tel: 781.329.4700 ©2011–2015 Analog Devices, Inc. All rights reserved.
Technical Support
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AD8124* Product Page Quick Links
Last Content Update: 11/01/2016
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• AD8124 Evaluation Board
Documentation
Data Sheet
• AD8124: Triple Differential Receiver with 200 Meter
Adjustable Cable Equalization Data Sheet
Design Resources
• AD8124 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
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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
Pin Configuration and Function Description .............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 10
Input Common-Mode Voltage Range Considerations ......... 10
REVISION HISTORY
12/15—Rev. 0 to Rev. A
Changes to Figure 3.......................................................................... 6
Updated Outline Dimensions ....................................................... 15
Changes to Ordering Guide .......................................................... 15
1/11—Revision 0: Initial Version
Data Sheet
Applications Information .............................................................. 11
Basic Operation .......................................................................... 11
Comparators ............................................................................... 11
Sync Pulse Extraction Using Comparators ............................. 12
Using the VPEAK, VPOLE, VGAIN, and VOFFSET Inputs ................... 12
Using the AD8124 with Coaxial Cable.................................... 13
Driving 75 Ω Video Cable with the AD8124.......................... 13
Driving a Capacitive Load......................................................... 13
Power Supply Filtering............................................................... 13
Layout and Power Supply Decoupling Considerations......... 14
Power-Down ............................................................................... 14
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 15
Rev. A | Page 2 of 15



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Data Sheet
AD8124
SPECIFICATIONS
TA = 25°C, VS = ±5 V, RL = 150 Ω, Belden Cable (BL-7987R), VOFFSET = 0 V, VPEAK, VGAIN, and VPOLE are set to recommended settings shown in
Figure 16, unless otherwise noted.
Table 1.
Parameter
DYNAMIC PERFORMANCE
10% to 90% Rise/Fall Time
Settling Time to 2%
–3 dB Large Signal Bandwidth
Integrated Output Voltage Noise
INPUT DC PERFORMANCE
Input Voltage Range
Maximum Differential Voltage Swing
Voltage Gain
Common-Mode Rejection Ratio (CMRR)
Input Resistance
Input Capacitance
Input Bias Current
VOFFSET Pin Current
VGAIN Pin Current
VPEAK Pin Current
VPOLE Pin Current
ADJUSTMENT PINS
VPEAK Input Voltage Range
VPOLE Input Voltage Range
VGAIN Input Voltage Range
VOFFSET to OUT Gain
Maximum Flat Gain
OUTPUT CHARACTERISTICS
Output Voltage Swing
Output Offset Voltage
Output Offset Voltage Drift
POWER SUPPLY
Operating Voltage Range
Positive Quiescent Supply Current
Negative Quiescent Supply Current
Supply Current Drift, ICC/IEE
Positive Power Supply Rejection Ratio
Negative Power Supply Rejection Ratio
Power Down, VIH (Minimum)
Power Down, VIL (Maximum)
Positive Supply Current, Powered Down
Negative Supply Current, Powered Down
Test Conditions/Comments
VOUT = 2 V step, 200 meters Cat-5
VOUT = 2 V step, 200 meters Cat-5
VOUT = 2 V p-p, <10 meters Cat-5
VOUT = 2 V p-p, 200 meters Cat-5
200 meter setting, integrated to 160 MHz
−IN and +IN
ΔVO/VI, VGAIN set for 0 meters of cable
At dc, VPEAK = VGAIN = VPOLE = 0 V
At dc, VPEAK = 1.15 V, VGAIN = 1.4 V, VPOLE = 1.5 V
At 1 MHz, VPEAK = 1.15 V, VGAIN = 1.4 V, VPOLE = 1.5 V
Common mode
Differential
Common mode
Differential
Relative to GND
Relative to GND
Relative to GND
OUT/VOFFSET, range limited by output swing
VGAIN = 1.5 V
150 Ω load
1 kΩ load
Referred to output, VPEAK = VGAIN = VPOLE = 0 V
Referred to output, VPEAK = 1.15 V, VGAIN = 1.4 V,
VPOLE = 1.5 V
Referred to output
DC, referred to output
DC, referred to output
Minimum Logic 1 voltage
Maximum Logic 0 voltage
VPEAK = VGAIN = VPOLE = 0 V
VPEAK = VGAIN = VPOLE = 0 V
Min Typ
8
47
110
52
4
±3.0
4
1
−86
−65
−50
4.4
3.7
1.0
0.5
2.4
30
0.5
0.4
0.4
0 to 1.5
0 to 1.5
0 to 1.5
1
1.9
−3.75 to +3.69
−3.66 to +3.69
24
37
33
±4.5
132
126
80
−51
−63
1.1
0.8
1.1
0.7
Max Unit
ns
ns
MHz
MHz
mV rms
V
V p-p
V/V
dB
dB
dB
MΩ
MΩ
pF
pF
µA
µA
µA
µA
µA
V
V
V
V/V
dB
V
V
mV
mV
µV/°C
±5.5 V
mA
mA
µA/°C
dB
dB
V
V
µA
µA
Rev. A | Page 3 of 15



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