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PDF AD8122 Data sheet ( Hoja de datos )
| Número de pieza | AD8122 | |
| Descripción | Triple Differential Receiver | |
| Fabricantes | Analog Devices | |
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Data Sheet
Triple Differential Receiver with
300 Meter Adjustable Line Equalization
AD8122
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 (VPEAK)
Output low-pass filter cutoff adjustment (VFILTER)
Broadband flat gain adjustment (VGAIN)
Selectable for UTP or coaxial compensation
DC output offset adjustment pin (VOFFSET)
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
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 VPEAK input controls the amount of high frequency
peaking, and the VGAIN input adjusts the broadband flat gain to
compensate for the flat cable loss. The VFILTER input controls the
cutoff frequency of output low-pass filters on each channel.
FUNCTIONAL BLOCK DIAGRAM
VPEAK VFILTER VOFFSET VGAIN
COAX/UTP
–INR
+INR
–ING
+ING
–INB
+INB
–INCMP1
+INCMP1
–INCMP2
+INCMP2
AD8122
Figure 1.
OUTR
GAINR
OUTG
GAING
OUTB
GAINB
OUTCMP1
OUTCMP2
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 VOFFSET 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.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.
1 page  
AD8122
Data Sheet
Parameter
Test Conditions/Comments
Min Typ
Max Unit
COMPARATORS
Output Voltage Level Low, VOL
Output Voltage Level High, VOH
Hysteresis, VHYST
Propagation Delay
0.3 V
3.3 V
70 mV
Low to High, tPD, LH
High to Low, tPD, HL
Rise Time, tRISE
Fall Time, tFALL
Output Resistance, VOL
Output Resistance, VOH
DIGITAL CONTROLS
14 ns
10 ns
8 ns
7 ns
18 Ω
1Ω
COAX/UTP Pin
Input Voltage Level Low, VIL
Input Voltage Level High, VIH
Input Current, Low
3.5
±0.7
1.5 V
V
µA
Input Current, High
24 µA
PD Pin
Input Voltage Level Low, VIL
Input Voltage Level High, VIH
Input Current, Low
3.2
1
2.9 V
V
µA
Input Current, High
1 µA
POWER SUPPLY
Operating Voltage Range
±4.5 ±5.5 V
Positive Quiescent Supply Current
120 mA
Negative Quiescent Supply Current
66 mA
Supply Current Drift, ICC
Supply Current Drift, IEE
Positive Power Supply Rejection
ΔVOUT/VSUPPLY
DC, RTO, 0 meters of cable, G = 1/G = 2
210
−120
−72/−66
µA/°C
µA/°C
dB
DC, RTO, 300 meters of cable, G = 1/G = 2
−68/−62
dB
100 MHz, RTO, 300 meters of cable, G = 1/G = 2
5/8
dB
Negative Power Supply Rejection
ΔVOUT/VSUPPLY
DC, RTO, 0 meters of cable, G = 1/G = 2
−88/−80
dB
DC, RTO, 300 meters of cable, G = 1/G = 2
−80/−74
dB
100 MHz, RTO, 300 meters of cable, G = 1/G = 2
18/14
dB
Positive Supply Current, Powered Down
Negative Supply Current, Powered Down
OPERATING TEMPERATURE RANGE
VPEAK = VGAIN = VFILTER = 0 V
VPEAK = VGAIN = VFILTER = 0 V
3.4
0.4
−40
mA
mA
+85 °C
Rev. 0 | Page 4 of 20
5 Page 
AD8122
20
ΔVOUT/ΔVIN, CM
0
–20
300m
–40
150m
–60
–80
–100
0.1 1 10 100
FREQUENCY (MHz)
Figure 16. Input Common-Mode Rejection vs. Frequency
for 300 m and 150 m Cable Lengths, G = 1
20
ΔVOUT/ΔVSUPPLY
10
0
–10 NEGATIVE, 300m
–20 NEGATIVE, 150m
–30
–40
–50
POSITIVE, 300m
–60
POSITIVE, 150m
–70
0.1 1 10 100
FREQUENCY (MHz)
Figure 17. Power Supply Rejection vs. Frequency
for 300 m and 150 m Cable Lengths, G = 1
6
4
2
0
–2
–4 INPUT
OUTPUT WITHOUT INPUT CLAMPS
OUTPUT WITH INPUT CLAMPS
–6
0 100 200 300 400 500 600 700 800 900 1000
TIME (ns)
Figure 18. Overdrive Recovery, G = 1
Data Sheet
20
ΔVOUT/ΔVIN, CM
0
–20
300m
–40
150m
–60
–80
–100
0.1 1 10 100
FREQUENCY (MHz)
Figure 19. Input Common-Mode Rejection vs. Frequency
for 300 m and 150 m Cable Lengths, G = 2
20
ΔVOUT/ΔVSUPPLY
10
0
–10 NEGATIVE, 300m
–20 NEGATIVE, 150m
–30
–40
–50 POSITIVE, 300m
–60 POSITIVE, 150m
–70
0.1 1 10 100
FREQUENCY (MHz)
Figure 20. Power Supply Rejection vs. Frequency
for 300 m and 150 m Cable Lengths, G = 2
6
4
2
0
–2
–4 INPUT × 2
OUTPUT
–6
0 100 200 300 400 500 600 700 800 900 1000
TIME (ns)
Figure 21. Overdrive Recovery, G = 2
Rev. 0 | Page 10 of 20
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AD8122.PDF ] | |
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