325 MHz, 8 × 8 Buffered Video
Crosspoint Switches
AD8108/AD8109
FUNCTIONAL BLOCK DIAGRAM
EATURES
SER/PAR D0 D1 D2 D3
8 × 8 high speed nonblocking switch arrays
AD8108: G = 1
A0
A1
AD8109: G = 2
Serial or parallel programming of switch array
CLK
A2
32-BIT SHIFT REGISTER
WITH 4-BIT
PARALLEL LOADING
Serial data out allows daisy-chaining of multiple 8 × 8 arrays
to create larger switch arrays
Output disable allows connection of multiple devices
Pin-compatible with AD8110/AD8111 16 × 8 switch arrays
For 16 × 16 arrays see AD8116
Complete solution
DATA
OUT
DATA IN
UPDATE
32
SET INDIVIDUAL
OR RESET ALL
OUTPUTS
PARALLEL LATCH
32
CE
RESET
TO "OFF"
8
DECODE
Buffered inputs
8 4:8 DECODERS
Eight output amplifiers
AD8108 (G = 1)
OUTPUT
BUFFER
G = +1
AD8108/AD8109
64
G = +2
AD8109 (G = 2)
Drives 150 Ω loads
Excellent video performance
60 MHz 0.1 dB gain flatness
0.02%/0.02° differential gain/differential phase error
(RL = 150 Ω)
SWITCH
MATRIX
8 OUTPUTS
8 INPUTS
Excellent ac performance
−3 dB bandwidth: 325 MHz (AD8108), 250 MHz (AD8109)
Slew rate: 400 V/μs (AD8108), 480 V/μs (AD8109)
Low power of 45 mA
Low all hostile crosstalk of −83 dB @ 5 MHz
Reset pin allows disabling of all outputs (connected through
a capacitor to ground provides power-on reset capability)
Figure 1. Functional Block Diagram
Excellent ESD rating: exceeds 4000 V human body model
80-lead LQFP (12 mm × 12 mm)
and 0.02°, respectively, along with 0.1 dB flatness out to 60 MHz,
make the AD8108/AD8109 ideal for video signal switching.
APPLICATIONS
The AD8108 and AD8109 include eight independent output
buffers that can be placed into a high impedance state for paral-
leling crosspoint outputs so that off channels do not load the
output bus. The AD8108 has a gain of 1, while the AD8109
offers a gain of 2. They operate on voltage supplies of 5 V
while consuming only 45 mA of idle current. The channel
switching is performed via a serial digital control (which can
accommodate daisy-chaining of several devices) or via a parallel
control allowing updating of an individual output without
re-programming the entire array.
Routing of high speed signals including
Composite video (NTSC, PAL, S, SECAM)
Component video (YUV, RGB)
Compressed video (MPEG, Wavelet)
3-level digital video (HDB3)
GENERAL DESCRIPTION
The AD8108/AD8109 are high speed 8 × 8 video crosspoint
switch matrices. They offer a −3 dB signal bandwidth greater than
250 MHz and channel switch times of less than 25 ns with 1%
settling. With −83 dB of crosstalk and −98 dB isolation (@5 MHz),
the AD8108/AD8109 are useful in many high speed applications.
The differential gain and differential phase of better than 0.02%
The AD8108/AD8109 is packaged in an 80-lead LQFP package
and is available over the extended industrial temperature range
of −40°C to +85°C.
Rev. B
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
Fax: 781.461.3113
www.analog.com
© 2005 Analog Devices, Inc. All rights reserved.
5秒后页面跳转
PCF8574资料解读：主要参数分析、引脚说明
AD637数据手册解读：主要特性、引脚及其功能解读、电气参数
ADUM1201资料手册解读：参数分析、引脚说明、应用分析
一文带你了解压敏电阻器在直流电路中的过压保护作用
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
