SA9106A

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4.

Electrostatic Discharge (ESD) Protection

The SA9106A integrated circuit inputs/outputs are protected against ESD according

to Mil-Std 883C, method 3015.

5.

Power Consumption

The power consumption rating of the SA9106A integrated circuit is less than 50mW,

excluding the display.

TYPICAL APPLICATIONS

In the Application Circuits (Figures 1 and 2) the components required for power

measurement applications, are shown.

In Figure 1 a shunt resistor is used for current sensing. In this application, the circuitry

requires a +2.5V, 0V, -2.5V DC supply.

In the case of Figure 2, when using a current transformer for current sensing, a +5V, 0V

DC supply is sufficient.

The most important external components for the SA9106A integrated circuit are:

C

converters. The value of these capacitors is 560pF.

The actual values determine the signal to noise and stability performance. The tolerances

should be within ±10%.

C

The optimum value is

3.3nF. The actual values are uncritical. Values smaller than 0.5nF and larger than 5nF

should be avoided.

R

The values should be selected for an input current of 16µA into the SA9106A at maximum

line current.

Values for RSH of less than 200µ

Ω should be avoided.

R

Where

I

L

=

Line current

RSH

=

Shunt resistor/termination resistor

R

so that the input current into the voltage sense input (virtual ground) is set to 14µA.

R

resistor value (R

change to R

= +10%).

XTAL is a colour burst TV crystal (f = 3.5795MHz) for the oscillator. The oscillator

frequency is divided down to 1.7897MHz on-chip to supply the digital circuitry and the

A/D converters.