High Speed, Triple Differential Receiver
with Comparators
AD8145
FEATURES
High speed: 500 MHz, 2000 V/μs @ G = 1, V
OUT
= 2 V p-p
0.1 dB flatness out to 75 MHz
High CMRR: 69 dB @ 10 MHz
High differential input impedance: 1 MΩ
Wide input common-mode range: ±3.5 V (±5 V supplies)
On-chip, gain setting resistors can be configured for gain of 1 or 2
Fast settling: 15 ns to 0.1% @ 2 V p-p
Low input referred noise: 13 nV/√Hz
Disable feature
Small packaging: 32-lead, 5 mm × 5 mm LFCSP
AEC-Q10 qualified (AD8145W)
FUNCTIONAL BLOCK DIAGRAM
GAIN_B
DIS/PD
REF_B
IN+_B
IN–_B
GND
GND
25
24
32
31
30
29
28
27
26
GND
REF_G
GAIN_G
IN+_G
IN–_G
REF_R
1
R
+
–
R
–
C
–
V
S–
GND
OUT_B
OUT_G
OUT_R
V
S+
COMPB_IN+
COMPB_IN–
GND
+
R
+
2
C
R
23
3
22
4
21
+
–
5
AD8145
C
R
+
–
R
–
11
12
13
14
15
16
20
6
19
B
A
18
APPLICATIONS
RGB video receivers
YPbPr video receivers
Keyboard, video, mouse (KVM)
Unshielded twisted pair (UTP) receivers
Automotive driver assistance (AD8145W)
Automotive Infotainment (AD8145W)
GAIN_R
GND
7
8
9
10
+
17
GND
IN+_R
COMPA_IN+
COMPA_IN–
IN–_R
COMPA_OUT
COMPB_OUT
GND
Figure 1.
GENERAL DESCRIPTION
The AD8145 is a triple, low cost, differential-to-single-ended
receiver specifically designed for receiving red-green-blue (RGB)
video signals over twisted pair cable or differential printed circuit
board (PCB) traces. It can also be used to receive any type of
analog signal or high speed data transmission. Two auxiliary
comparators with hysteresis are provided that can be used to
decode video sync signals, which are encoded on the received
common-mode voltages, to receive digital signals or as general-
purpose comparators. The AD8145 can be used in conjunction
with the
AD8133
or
AD8134
triple differential drivers to provide a
complete low cost solution for RGB over Category 5 UTP cable
applications, including KVM.
The excellent common-mode rejection (69 dB @ 10 MHz) of
the AD8145 allows for the use of low cost, unshielded twisted
pair cables in noisy environments.
The AD8145 can be configured for a differential-to-single-ended
gain of 1 or 2 by connecting the GAIN_x pin of each channel to
its respective output (G = 1) or connecting it to a reference voltage
(G = 2), which is normally grounded.
A REF_x input is provided on each channel that allows designers to
level shift the output signals.
The AD8145W is the automotive grade version that is qualified
per the AEC-Q100 for use in automotive applications. See the
Automotive Products section for more details.
The AD8145 is available in a 5 mm × 5 mm, 32-lead LFCSP and
is rated to work over the extended industrial temperature range
of −40°C to +105°C.
Rev. A
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 ©2006–2010 Analog Devices, Inc. All rights reserved.
06307-001
AD8145
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
Maximum Power Dissipation ..................................................... 7
ESD Caution .................................................................................. 7
Pin Configuration and Function Description .............................. 8
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 14
Applications Information .............................................................. 15
Overview ..................................................................................... 15
Basic Closed-Loop Gain Configurations ................................ 15
Terminating the Input................................................................ 16
Input Clamping........................................................................... 17
PCB Layout Considerations ...................................................... 18
Driving a Capacitive Load......................................................... 19
Power-Down ............................................................................... 19
Automotive Products ................................................................. 19
Comparators ............................................................................... 19
Sync Pulse Extraction Using Comparators ............................. 20
Outline Dimensions ....................................................................... 21
Ordering Guide .......................................................................... 21
REVISION HISTORY
1/10—Rev. 0 to Rev. A
Changes to Features Section, Applications Section, and General
Description Section .......................................................................... 1
Changes to Table 1 ............................................................................ 3
Changes to Table 2 ............................................................................ 5
Added Automotive Products Section .......................................... 19
Added Exposed Paddle Notation to Outline Dimensions ........ 21
Changes to Ordering Guide .......................................................... 21
10/06—Revision 0: Initial Version
Rev. A | Page 2 of 24
AD8145
SPECIFICATIONS
T
A
= 25°C, V
S
= ±5 V, REF_x = 0 V, R
L
= 150 Ω, C
L
= 2 pF, G = 1, T
MIN
to T
MAX
= −40°C to +105°C, unless otherwise noted.
Table 1.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Conditions
V
OUT
= 0.2 V p-p
V
OUT
= 2 V p-p
V
OUT
= 0.2 V p-p, G = 2
V
OUT
= 2 V p-p, G = 2
V
OUT
= 2 V p-p
V
OUT
= 2 V p-p, G = 2
V
OUT
= 2 V p-p
V
OUT
= 2 V p-p, G = 2
V
OUT
= 2 V p-p, 0.1%
Min
Typ
530
500
200
200
75
100
2100
2100
15
20
−67
−88
−62
13
0.25
0.1
81
78
90
69
41
±3.5
±2.5
1
1.3
1
2
1.955
1.930
−17.5
−25
−6
−7
−400
−650
−3.64
−3.45
50
+195/−230
1.985
+7.0
−18
−3.4
25
−65
2.020
2.030
+1.0
+8.0
−0.9
−0.5
+300
+650
+3.55
+3.35
Max
Unit
MHz
MHz
MHz
MHz
MHz
MHz
V/μs
V/μs
ns
ns
dBc
dBc
dB
nV/√Hz
%
Degrees
dB
dB
dB
dB
V
V
MΩ
MΩ
pF
pF
V/V
V/V
mV
mV
μV/°C
μA
μA
nA/°C
nA
nA
V
V
mA
mA
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time
Output Overdrive Recovery
NOISE/DISTORTION
Second Harmonic
Third Harmonic
Crosstalk
Input Voltage Noise (RTI)
Differential Gain Error
Differential Phase Error
INPUT CHARACTERISTICS
Common-Mode Rejection
V
OUT
= 2 V p-p, 1 MHz
V
OUT
= 2 V p-p, 1 MHz
V
OUT
= 2 V p-p, 10 MHz
f ≥ 10 kHz
NTSC, 200 IRE, R
L
≥ 150 Ω
NTSC, 200 IRE, R
L
≥ 150 Ω
DC, V
CM
= −2 V to +2 V
AD8145W only, T
MIN
to T
MAX
V
CM
= 1 V p-p, f = 10 MHz
V
CM
= 1 V p-p, f = 100 MHz
V
+IN
− V
−IN
= 0 V
Differential
Common mode
Differential
Common mode
DC, G = 2
AD8145W only, T
MIN
to T
MAX
G=2
AD8145W only, T
MIN
to T
MAX
T
MIN
to T
MAX
AD8145W only, T
MIN
to T
MAX
T
MIN
to T
MAX
(+IN, −IN)
AD8145W only, T
MIN
to T
MAX
Common-Mode Voltage Range
Differential Operating Range
Resistance
Capacitance
DC PERFORMANCE
Closed-Loop Gain
Output Offset Voltage
Output Offset Voltage Drift
Input Bias Current (+IN, −IN)
Input Bias Current Drift
Input Offset Current
OUTPUT PERFORMANCE
Voltage Swing
AD8145W only, T
MIN
to T
MAX
Output Current
Short-Circuit Current
Short to GND, source/sink
Rev. A | Page 3 of 24
AD8145
Parameter
COMPARATOR PERFORMANCE
V
OH
V
OL
Input Offset Voltage
Hysteresis Width
Input Bias Current
Propagation Delay, t
PLH
Propagation Delay, t
PHL
Rise Time
Fall Time
POWER-DOWN PERFORMANCE
Power-Down V
IH
Power-Down V
IL
Power-Down I
IH
Power-Down I
IL
Power-Down Assert Time
POWER SUPPLY
Operating Range
Quiescent Current, Positive Supply
Conditions
R
L
= 1 kΩ
AD8145W only, T
MIN
to T
MAX
R
L
= 1 kΩ
AD8145W only, T
MIN
to T
MAX
Min
3.205
2.950
Typ
3.310
0.390
±2.5
18
1.5
6
6
6
2
V
S+
− 1.65
V
S+
− 2.65
0.5
−250
1
4.5
48.5
AD8145W only, T
MIN
to T
MAX
Disabled
AD8145W only, T
MIN
to T
MAX
Quiescent Current, Negative Supply
AD8145W only, T
MIN
to T
MAX
Disabled
AD8145W only, T
MIN
to T
MAX
DC
AD8145W only, T
MIN
to T
MAX
DC
AD8145W only, T
MIN
to T
MAX
−52
−65
−13.9
−20
16
−43.5
−11
−79
−68
−70
−66
−57
−54
11
57.5
70
19.5
25
0.420
0.440
Max
Unit
V
V
V
V
mV
mV
μA
ns
ns
ns
ns
V
V
μA
μA
μs
V
mA
mA
mA
mA
mA
mA
mA
mA
dB
dB
dB
dB
10% to 90%
10% to 90%
PSRR, Positive Supply
PSRR, Negative Supply
Rev. A | Page 4 of 24
AD8145
T
A
= 25°C, V
S
= ±2.5 V, REF_x = 0 V, R
L
= 1 kΩ, C
L
= 2 pF, G = 1, T
MIN
to T
MAX
= −40°C to +105°C, unless otherwise noted.
Table 2.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Conditions
V
OUT
= 0.2 V p-p
V
OUT
= 2 V p-p
V
OUT
= 0.2 V p-p, G = 2, R
L
= 150 Ω
V
OUT
= 2 V p-p, G = 2, R
L
= 150 Ω
V
OUT
= 2 V p-p
V
OUT
= 2 V p-p, G = 2, R
L
= 150 Ω
V
OUT
= 2 V p-p
V
OUT
= 2 V p-p, G = 2, R
L
= 150 Ω
V
OUT
= 2 V p-p, 0.1%
Min
Typ
450
425
180
180
53
100
2000
2000
16
10
−71
−76
−62
13
78
75
86
72
43
±1.25
±1.6
1
1.3
1
2
1.960
1.930
−13.5
−18
−6
−7
−400
−650
−1.35
−1.20
25
+100/−100
V
S+
− 1.5
V
S+
− 2.5
0.25
50
1
1.985
−4.5
−18
−3.5
25
−60
2.016
2.030
+2
+8
−0.9
−0.5
+300
+650
+1.3
+1.15
Max
Unit
MHz
MHz
MHz
MHz
MHz
MHz
V/μs
V/μs
ns
ns
dBc
dBc
dB
nV/√Hz
dB
dB
dB
dB
V
V
MΩ
MΩ
pF
pF
V/V
V/V
mV
mV
μV/°C
μA
μA
nA/°C
nA
nA
V
V
mA
mA
V
V
μA
μA
μs
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time
Output Overdrive Recovery
NOISE/DISTORTION
Second Harmonic
Third Harmonic
Crosstalk
Input Voltage Noise (RTI)
INPUT CHARACTERISTICS
Common-Mode Rejection
V
OUT
= 1 V p-p, 1 MHz
V
OUT
= 1 V p-p, 1 MHz
V
OUT
= 1 V p-p, 10 MHz
f ≥ 10 kHz
DC, V
CM
= −1 V to +1 V
AD8145W only, T
MIN
to T
MAX
V
CM
= 1 V p-p, f = 10 MHz
V
CM
= 1 V p-p, f = 100 MHz
V
+IN
− V
−IN
= 0 V
Differential
Common mode
Differential
Common mode
DC, G = 2
AD8145W only, T
MIN
to T
MAX
G=2
AD8145W only, T
MIN
to T
MAX
T
MIN
to T
MAX
AD8145W only, T
MIN
to T
MAX
T
MIN
to T
MAX
(+IN, −IN)
AD8145W only, T
MIN
to T
MAX
Common-Mode Voltage Range
Differential Operating Range
Resistance
Capacitance
DC PERFORMANCE
Closed-Loop Gain
Output Offset Voltage
Output Offset Voltage Drift
Input Bias Current (+IN, −IN)
Input Bias Current Drift
Input Offset Current
OUTPUT PERFORMANCE
Voltage Swing
Output Current
Short-Circuit Current
POWER-DOWN PERFORMANCE
Power-Down V
IH
Power-Down V
IL
Power-Down I
IH
Power-Down I
IL
Power-Down Assert Time
R
L
= 150 Ω
AD8145W only, T
MIN
to T
MAX
Short to GND, source/sink
Rev. A | Page 5 of 24
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