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.

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 × 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

Buffered inputs

Eight output amplifiers

AD8108 (G = 1)

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)

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)

Excellent ESD rating: exceeds 4000 V human body model

80-lead LQFP (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)