450 MHz, Triple 16 × 5
Video Crosspoint Switch
AD8178
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAM
D0 D1 D2 D3 D4 VPOS VNEG VDD DGND
Large, triple 16 × 5 high speed, nonblocking switch array
Pin compatible with the AD8175 and AD8176 (16 × 9 switch
arrays) and the AD8177 (16 × 5 switch array)
Differential or single-ended operation
Supports sync-on common-mode and sync-on color
operating modes
AD8178
A0
A1
A2
SERIN
CLR
SER/PAR
45-BIT SHIFT
RGB and HV outputs available for driving monitor directly
G = +4 operation (differential input to differential output)
Flexible power supplies: +5 V or 2.5 V
Logic ground for convenient control interface
Serial or parallel programming of switch array
High impedance output disable allows connection of
multiple devices with minimal loading on output bus
Adjustable output CM and black level through external pins
Excellent ac performance
REGISTER WITH
5-BIT PARALLEL
LOADING
1
0
WE
SEROUT
CLK
20
25
NO
CS
CONNECT
UPDATE
RST
PARALLEL LATCH
CMENC
25
5
DECODE
5 × 5:16 DECODERS
Bandwidth: 450 MHz
Slew rate: 1650 V/μs
Settling time: 4 ns to 1% to support 1600 × 1200 at 85 Hz
Low power of 2.3 W
Low all hostile crosstalk
80
INPUT
RECEIVER
G = +2
OUTPUT
BUFFER
G = +1
2
2
2
2
2
2
R
G
B
R
G
B
H
V
−82 dB at 5 MHz
−47 dB at 500 MHz
Wide input common-mode range of 4 V
Reset pin allows disabling of all outputs
Fully populated 26 × 26 ball PBGA package (27 mm × 27 mm,
1 mm ball pitch)
SWITCH
MATRIX
G = +2
2
2
2
2
R
G
B
R
G
B
H
V
Convenient grouping of RGB signals for easy routing
2
2
APPLICATIONS
RGB video switching
KVM
Professional video
VBLK
VOCM_CMENCON
VOCM_CMENCOFF
Figure 1.
GENERAL DESCRIPTION
The AD8178 is a high speed, triple 16 × 5 video crosspoint switch
matrix. It supports 1600 × 1200 RGB displays at 85 Hz refresh rate,
by offering a 450 MHz bandwidth and a slew rate of 1650 V/μs.
With −82 dB of crosstalk and −84 dB isolation (at 5 MHz), the
AD8178 is useful in many high speed video applications.
The outputs can be used single-ended in conjunction with
decoded H and V outputs to drive a monitor directly.
The independent output buffers of the AD8178 can be placed
into a high impedance state to create larger arrays by paralleling
crosspoint outputs. Inputs can be paralleled as well. The AD8178
offers both serial and a parallel programming modes.
The AD8178 supports two modes of operation: differential-in to
differential-out mode with sync-on CM signaling passed
through the switch and differential-in to differential-out mode
with CM signaling removed through the switch. The output CM
and black level can be conveniently set via external pins.
The AD8178 is packaged in a fully populated 26 × 26 ball PBGA
package and is available over the extended industrial
temperature range of −40°C to +85°C.
Rev. A
Document Feedback
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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 ©2007–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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