High Speed, Triple Differential Receiver
with Comparators
AD8145
FUNCTIONAL BLOCK DIAGRAM
FEATURES
High speed: 500 MHz, 2000 V/μs @ G = 1, VO = 2 V p-p
0.1 dB flatness out to 75 MHz
32
31
30
29
28
–
27
26
25
High CMRR: 69 dB @ 10 MHz
C
High differential input impedance: 1 MΩ
Wide input common-mode range: 3.8 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: 13nV/√Hz
Disable feature
1
2
3
4
5
6
7
8
R
R
24
23
22
21
20
19
18
17
GND
REF_G
GAIN_G
IN+_G
GND
–
OUT_B
OUT_G
OUT_R
+
C
R
–
R
+
–
IN–_G
V
S+
AD8145
Small packaging: 32-lead, 5 mm × 5 mm LFCSP
REF_R
GAIN_R
GND
+
–
COMPB_IN+
COMPB_IN–
GND
C
R
APPLICATIONS
B
A
RGB video receivers
YPbPr video receivers
R
–
KVM (keyboard, video, mouse)
UTP (unshielded twisted pair) receivers
9
10
11
12
13
14
15
16
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 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, which can
be used to decode video sync signals that 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 AD8145 can be configured for a differential-to-single-
ended gain of 1 or 2 by connecting the GAIN 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 input is provided on each channel that allows designers
to level shift the output signals.
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.
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.
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.
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