
500 MHz, Triple 16 × 5
Video Crosspoint Switch
AD8177
Rev. 0
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2007 Analog Devices, Inc. All rights reserved.
FEATURES
High channel count, triple 16 × 5 high speed, nonblocking
switch array
and AD8178 (16 × 5 switch array) Differential or single-ended operation
Supports sync-on common-mode and sync-on color
operating modes
Decoded HV sync outputs available
G = +2 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 (to support 1600 × 1200 @ 85 Hz)
Bandwidth: 500 MHz
Slew rate: 1800 V/μs
Settling time: 4 ns to 1%
Low power of 2.3 W
Low all-hostile crosstalk
88 dB @ 5 MHz
46 dB @ 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)
Convenient grouping of RGB signals for easy routing
APPLICATIONS
RGB video switching
KVM
Professional video
FUNCTIONAL BLOCK DIAGRAM
2
INPUT
RECEIVER
G = +1
OUTPUT
BUFFER
G = +1
5
80
S
E
T
I
ND
IV
IDUAL
,O
R
E
S
E
T
A
L
O
U
T
P
U
T
S
TO
O
F
E
N
A
B
L
E
/D
IS
A
B
L
E
25
VBLK
VOCM_CMENCON
VOCM_CMENCOFF
R
G
B
R
G
B
16
x
R
G
B
CHA
NNE
L
S
CMENC
SERIN
RST
UPDATE
CLK
WE
SER/PAR
D0 D1 D2 D3 D4 VPOS VNEG VDD
DGND
SEROUT
5x
RG
B,
H
V
C
HANNE
L
S
H
B
G
R
V
H
B
G
R
V
25
A0
A1
A2
AD8177
CS
06
60
5-
0
01
1
0
SWITCH
MATRIX
G = +2
45-BIT SHIFT
REGISTER WITH
5-BIT PARALLEL
LOADING
DECODE
5 × 5:16 DECODERS
PARALLEL LATCH
20
NO
CONNECT
CLR
Figure 1.
GENERAL DESCRIPTION
The AD8177 is a high speed, triple 16 × 5 video crosspoint
switch matrix. It supports 1600 × 1200 RGB displays @ 85 Hz
refresh rate by offering a 500 MHz bandwidth and a slew rate of
1800 V/μs. With 88 dB of crosstalk and 94 dB isolation
(@ 5 MHz), the AD8177 is useful in many high speed video
applications.
The AD8177 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 independent output buffers of the AD8177 can be placed
into a high impedance state to create larger arrays by paralleling
crosspoint outputs. Inputs can be paralleled as well. The
AD8177 offers both serial and parallel programming modes.
The AD8177 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.