ADI AD8108ASTZ

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 (at 5 MHz), the AD8108/AD8109 are useful in many high speed applications. The differential gain and differential 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 paralleling 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 reprogramming the entire array. The AD8108/AD8109 is packaged in an 80-lead LQFP and is available over the extended industrial temperature range of -40°C to +85°C.

• 8x8 high speed nonblocking switch arrays AD8108: G (overline) = 7 AD8109: G (overline) = 2
• Serial or parallel programming of switch array
• Serial data out allows daisy-chaining of multiple 8x8 arrays to create larger switch arrays
• Output disable allows connection of multiple devices
• Pin-compatible with AD8110/AD8111 16x8 switch arrays
• 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 (overline) = 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 at 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 mmx12 mm)

• 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)