Document Number: 70061

S-71009–Rev. I, 14-May-07

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11

Vishay Siliconix

DG406/407

APPLICATIONS HINTS

The block diagram shown in Figure 6 illustrates a typical data

acquisition front end suitable for low-level analog signals.

Differential multiplexing of small signals is preferred since

this method helps to reject any common mode noise. This is

especially important when the sensors are located at a

distance and it may eliminate the need for individual

DG407 helps to reduce measurement errors. The low power

dissipation of the DG407 minimizes on-chip thermal

gradients which can cause errors due to temperature

mismatch along the parasitic thermocouple paths. Please

refer to Application Note AN203 for additional information.

Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Tech-

nology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability

Figure 6. Measuring low-level analog signals is more accurate when using a differential multiplexing technique.

12-Bit

A/D

Converter

Analog

Multiplexer

DG407

Controller

To

Sensor 1

To

Sensor 8

Inst

Amp

S/H