AD8109

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 3 8 Switch Arrays
For 16 3 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/ms 480 V/ms
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)





Application

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)




Pinout








Specifications

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12.0 V
Internal Power Dissipation²
AD8108/AD8109 80-Lead Plastic TQFP (ST) . . . . . ......2.6 W
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±V_S
Output Short Circuit Duration
. . . . . . . . . . . . . . . . . . . . . . ...Observe Power Derating Curves
Storage Temperature Range . . . . . . . . . . . 65°C to +125°C
Lead Temperature Range (Soldering 10 sec) . . . . .. . .+300°C

Description

The AD8108 and 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. 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 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.