ad8108-eb Analog Devices, Inc., ad8108-eb Datasheet

ad8108-eb

Manufacturer Part Number

ad8108-eb

Description

325 Mhz, 8 X 8 Buffered Video Crosspoint Switches

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD8108-EB.pdf (32 pages)

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FEATURES

8 × 8 high speed nonblocking switch arrays

Serial or parallel programming of switch array

Serial data out allows daisy-chaining of multiple 8 × 8 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

Excellent video performance

Excellent ac performance

Low power of 45 mA

Low all hostile crosstalk of −83 dB @ 5 MHz

Reset pin allows disabling of all outputs (connected through

Excellent ESD rating: exceeds 4000 V human body model

80-lead LQFP (12 mm × 12 mm)

APPLICATIONS

Routing of high speed signals including

GENERAL DESCRIPTION

The AD8108/AD8109

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%

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.

Patent pending.

AD8108: G = 1

AD8109: G = 2

to create larger switch arrays

Buffered inputs

Eight output amplifiers

Drives 150 Ω loads

60 MHz 0.1 dB gain flatness

0.02%/0.02° differential gain/differential phase error

−3 dB bandwidth: 325 MHz (AD8108), 250 MHz (AD8109)

Slew rate: 400 V/µs (AD8108), 480 V/µs (AD8109)

a capacitor to ground provides power-on reset capability)

Composite video (NTSC, PAL, S, SECAM)

Component video (YUV, RGB)

Compressed video (MPEG, Wavelet)

3-level digital video (HDB3)

AD8108 (G = 1)

AD8109 (G = 2)

= 150 Ω)

are high speed 8 × 8 video crosspoint

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

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.

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

8 INPUTS

UPDATE

DATA IN

325 MHz, 8 × 8 Buffered Video

RESET

CLK

AD8108/AD8109

FUNCTIONAL BLOCK DIAGRAM

Figure 1. Functional Block Diagram

SER/PAR D0 D1 D2 D3

PARALLEL LATCH

8 × 4:8 DECODERS

Crosspoint Switches

32-BIT SHIFT REGISTER

PARALLEL LOADING

DECODE

SWITCH

MATRIX

WITH 4-BIT

AD8108/AD8109

OUTPUT

BUFFER

G = +1

G = +2

SET INDIVIDUAL

OR RESET ALL

OUTPUTS

TO "OFF"

www.analog.com

DATA

OUT

8 OUTPUTS

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