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AN504

更新时间： 2024-11-14 03:18:47

品牌	Logo	应用领域
威世 - VISHAY		光电开关
页数	文件大小	规格书
12页	153K
描述
Video Crosspoint Switch Simplifies Large Matrix Designs

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AN504

Vishay Siliconix

Video Crosspoint Switch Simplifies Large Matrix Designs

The DG884 is a digitally selectable eight-input to four-output

monolithic bidirectional crosspoint IC suitable for wideband

analog and digital signal routing. Wideband here is used to

define signals with bandwidths in the range of 60 to 200 MHz.

Fabricated with the Vishay Siliconix D/CMOS technology, the

DG884 incorporates n-channel DMOS switching FETs with

low-power CMOS control logic, drivers, and latches. The

low-capacitance DMOS FETs are connected as low

on-resistance T-switches to achieve high levels of off-isolation

and low levels of crosstalk. On-chip TTL-compatible address

latches and data readback are included to simplify

microprocessor interfacing. Double buffering of the switch

addressing allows update information to be loaded without

affecting the existing state of the crosspoint. A single SALVO

command is all that is required to transfer previously set

information to the current event latches. This single command

significantly speeds up the setup time, especially in large

matrices requiring more than one DG884.

The Signal Path

The internal function blocks of the DG884 are shown in

Figure 1, and the signal path from one input to one output is

shown in Figure 2. The signal path is composed of a T-switch

at the matrix and an additional low-resistance switch in series

with each output. The T-switch connection maximizes the

off-isolation by shunting to ground any signal that feeds

through the small series capacitances of the off series

switches. The series output switches offer a number of

advantages, namely:

D They provide an extra stage of isolation at the output

D They reduce the off-state output capacitance, which is

necessary when other DG884 outputs are connected in

parallel.

D They reduce the off-output leakage.

IN IN IN IN IN IN IN IN

OUT

Signal Path Input to Output

8 x 4 Switch Matrix

SW1

SW2

SW4

Input

1 of 8

Output

1 of 4

SW3

4 Disable Outputs

(Quad Package

Only)

Decode Logic, Switch Drivers

Current Event Latches

Next Event Latches

From Input 2 of 8

From Input 8 of 8

SALVO

I/O Control

Logic

MUX Common

Typical on-resistances at 25_C:

SW1 = SW2 = 20 W

SW3 = 200 W

SW4 = 10 W

I/O A

A A

1 0

FIGURE 1. DG884 Block Diagram

FIGURE 2. DG884 Signal Path

Document Number: 70610

05-Aug-99

www.vishay.com S FaxBack 408-970-5600

6-1

12 3 4 5 6 7...12

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