AD8108 Datasheet, PDF (1/28 Pages) Analog Devices – 325 MHz, 8 x 8 Buffered Video Crosspoint Switches

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FEATURES
8 ؋ 8 High Speed Nonblocking Switch Arrays
AD8108: G = +1
AD8109: G = +2
Serial or Parallel Programming of Switch Array
Serial Data Out Allows “Daisy Chaining” of Multiple
8 ؋ 8s 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
Buffered Inputs
Eight Output Amplifiers,
AD8108 (G = +1),
AD8109 (G = +2)
Drives 150 ⍀ Loads
Excellent Video Performance
60 MHz 0.1 dB Gain Flatness
0.02%/0.02؇ Differential Gain/Differential Phase Error
(R_L = 150 ⍀)
Excellent AC Performance
AD8108
AD8109
–3 dB Bandwidth 325 MHz
250 MHz
Slew Rate
400 V/␮s
480 V/␮s
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)
Excellent ESD Rating: Exceeds 4000 V Human Body
Model
80-Lead TQFP Package (12 mm ؋ 12 mm)
APPLICATIONS
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)
PRODUCT DESCRIPTION
The AD8108 and AD8109 are high speed 8 × 8 video cross-
point 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
325 MHz, 8 ؋ 8 Buffered Video
Crosspoint Switches
AD8108/AD8109*
FUNCTIONAL BLOCK DIAGRAM
SER/PAR D0 D1 D2 D3
CLK
DATA IN
UPDATE
CE
RESET
32-BIT SHIFT REGISTER
WITH 4-BIT
PARALLEL LOADING
32
PARALLEL LATCH
32
DECODE
8
8 ؋ 4:8 DECODERS
A0
A1
A2
DATA OUT
AD8108/AD8109
64
OUTPUT
BUFFER
G = +1,
G = +2
8 INPUTS
SWITCH
MATRIX
8 OUTPUTS
phase of better than 0.02% and 0.02° respectively along with
0.1 dB flatness out to 60 MHz make the AD8108/AD8109 ideal
for video signal switching.
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 switch-
ing is performed via a serial digital control (which can accommo-
date “daisy chaining” of several devices) or via a parallel control
allowing updating of an individual output without re-programing
the entire array.
The AD8108/AD8109 is packaged in an 80-lead TQFP package
and is available over the extended industrial temperature range
of –40°C to +85°C.
*Patent Pending.
REV. 0
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© Analog Devices, Inc., 1997