AD8108 325 MHz, 8 x 8 Buffered Video Crosspoint Switch (Gain = 1)

Product Details

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.

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)

Features and Benefits

• 8 × 8 high speed nonblocking switch arrays: G = 1
• 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: G = 1
  • Drives 150 Ω loads
• Excellent video performance
  • 60 MHz 0.1 dB gain flatness
  • 0.02%/0.02° differential gain/differential phase error (R_L = 150 Ω)
• Excellent ac performance
  • −3 dB bandwidth: 325 MHz
  • Slew rate: 400 V/µs
• 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 mm × 12 mm)