PM9105AF

sames

4/10

For rated conditions, the signals into the current and voltage sensor inputs are set

as follows:

Current sensor input currents:

16µ A

RMS

Voltage sensor input currents:

14µ A

RMS

Under these conditions, the device generates a pulse rate of 1,16kHz at output

FOUT1.

The output frequency at FOUT2 is FOUT1/4. At FOUT3 the output frequency is

FOUT1/290.

2.

Electrostatic Discharge (ESD) Protection

The device's inputs/outputs are protected against ESD according to Mil-Std 883C,

method 3015. The modules resistance to transients will be dependant upon the

protection components used.

3.

Power Consumption

The overall power consumption rating for this power metering application (Figure 2),

is under 500mW, excluding the current sensors.

4.

Isolation

The reference for the unit is connected to neutral.

5.

Circuit Description

The module is supplied from an external 5V DC supply.

The Application Circuit (figure 2), details the components required for a three phase

power metering module. Terminated current transformers are used as current

sensors.

The most important external components are:

C

A/D converters. The typical value of C

560pF.

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

tolerances should be within ± 10%.

C

A/D converters. The typical value of C

0.5nF and larger than 5nF should be avoided.

Terminated current sensors (current transformers) are connected to the current

sensor inputs of the SA9105 through current setting resistors (R

The resistor values should be selected for an input current of 16

µA into the SA9105

at the rated line current.