AN201 Vishay Intertechnology, AN201 Datasheet

AN201

Manufacturer Part Number

AN201

Description

High-performance Multiplexing With The DG408

Manufacturer

Vishay Intertechnology

Datasheet

1.AN201.pdf (10 pages)

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The DG408 and DG409, new multiplexers from Vishay Silico-

nix, represent a new generation of high-performance

multiplexers and demultiplexers with many specific improve-

ments over existing products available today. Built with the

company’s high-voltage silicon-gate technology, these new

ICs offer significantly reduced on-resistance (<100 W),

leakage currents (I

(2.25 mW), and much faster switching (250 ns) over older

industry standards. These improved specifications allow

designers to greatly reduce system errors and improve system

performance.

The DG408 and DG409 will enhance two primary multiplexer

and demultiplexer applications: communications and teleme-

try. Important multiplexer specifications depend on the

application and the accuracy required by the system. For

example, in communications, switching speed is important;

whereas, in telemetry, on-resistance, charge injection, and

output capacitance are critical because they determine the

accuracy of the system. This article will present examples of

these types of applications and discuss the benefits that these

new multiplexers bring to their system performance.

Communications

The digital telephone exchange is a communication

multiplexed system. In this type of system (see Figure 1), a

number of telephone channels carrying speech are

sequentially switched (i.e., multiplexed) for fixed periods of

time into an analog-to-digital converter. Once converted to a

digital form, the different speech signals can be processed and

routed within the exchange.

A typical specification for the voice bandwidth in a telephone

exchange is 3.3 kHz. For this bandwidth, an 8-kHz sampling

rate is sufficient (i.e., sampling rate > 2 times the bandwidth).

Therefore, each sampling period is 125 ms, during which time,

each of the 32 channels of the multiplexer must be addressed.

This means that each channel will be turned on for 3.906 ms

(125 ms/32). This figure is ideal, since the multiplexer cannot

switch in zero time. Depending on the particular multiplexer

used, there will either be an overlap between sampling pulses

(i.e., make-before-break switching), which leads to crosstalk

between channels, or a separation between samples (i.e.,

break-before-make switching), which reduces the sampling

time of a particular channel and results in lower multiplexer

efficiency. The DG408 has switching times (250 ns) guaran-

Document Number: 70600

05-Aug -99

High-Performance Multiplexing with the DG408

S(OFF)

< 0.5 nA),

power

dissipation

teed to be more than four times faster than previously available

(1 ms) multiplexers. Its guaranteed break-before-make time

(10 ns) prevents crosstalk during switching transitions.

FIGURE 1. 32-Channel Multiplexed System

Address Bus

DG408

Vishay Siliconix

AN201

www.vishay.com

OUT

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